1 /*
2  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/stat.h>
18 #include <sys/queue.h>
19 #include <sys/tree.h>
20 
21 #include <dirent.h>
22 #include <limits.h>
23 #include <stddef.h>
24 #include <string.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <fcntl.h>
28 #include <errno.h>
29 #include <unistd.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <fnmatch.h>
33 #include <libgen.h>
34 #include <uuid.h>
35 #include <util.h>
36 
37 #include "got_error.h"
38 #include "got_repository.h"
39 #include "got_reference.h"
40 #include "got_object.h"
41 #include "got_path.h"
42 #include "got_cancel.h"
43 #include "got_worktree.h"
44 #include "got_opentemp.h"
45 #include "got_diff.h"
46 
47 #include "got_lib_worktree.h"
48 #include "got_lib_sha1.h"
49 #include "got_lib_fileindex.h"
50 #include "got_lib_inflate.h"
51 #include "got_lib_delta.h"
52 #include "got_lib_object.h"
53 #include "got_lib_object_parse.h"
54 #include "got_lib_object_create.h"
55 #include "got_lib_object_idset.h"
56 #include "got_lib_diff.h"
57 
58 #ifndef MIN
59 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
60 #endif
61 
62 static const struct got_error *
63 create_meta_file(const char *path_got, const char *name, const char *content)
64 {
65 	const struct got_error *err = NULL;
66 	char *path;
67 
68 	if (asprintf(&path, "%s/%s", path_got, name) == -1)
69 		return got_error_from_errno("asprintf");
70 
71 	err = got_path_create_file(path, content);
72 	free(path);
73 	return err;
74 }
75 
76 static const struct got_error *
77 update_meta_file(const char *path_got, const char *name, const char *content)
78 {
79 	const struct got_error *err = NULL;
80 	FILE *tmpfile = NULL;
81 	char *tmppath = NULL;
82 	char *path = NULL;
83 
84 	if (asprintf(&path, "%s/%s", path_got, name) == -1) {
85 		err = got_error_from_errno("asprintf");
86 		path = NULL;
87 		goto done;
88 	}
89 
90 	err = got_opentemp_named(&tmppath, &tmpfile, path);
91 	if (err)
92 		goto done;
93 
94 	if (content) {
95 		int len = fprintf(tmpfile, "%s\n", content);
96 		if (len != strlen(content) + 1) {
97 			err = got_error_from_errno2("fprintf", tmppath);
98 			goto done;
99 		}
100 	}
101 
102 	if (rename(tmppath, path) != 0) {
103 		err = got_error_from_errno3("rename", tmppath, path);
104 		unlink(tmppath);
105 		goto done;
106 	}
107 
108 done:
109 	if (fclose(tmpfile) != 0 && err == NULL)
110 		err = got_error_from_errno2("fclose", tmppath);
111 	free(tmppath);
112 	return err;
113 }
114 
115 static const struct got_error *
116 read_meta_file(char **content, const char *path_got, const char *name)
117 {
118 	const struct got_error *err = NULL;
119 	char *path;
120 	int fd = -1;
121 	ssize_t n;
122 	struct stat sb;
123 
124 	*content = NULL;
125 
126 	if (asprintf(&path, "%s/%s", path_got, name) == -1) {
127 		err = got_error_from_errno("asprintf");
128 		path = NULL;
129 		goto done;
130 	}
131 
132 	fd = open(path, O_RDONLY | O_NOFOLLOW);
133 	if (fd == -1) {
134 		if (errno == ENOENT)
135 			err = got_error_path(path, GOT_ERR_WORKTREE_META);
136 		else
137 			err = got_error_from_errno2("open", path);
138 		goto done;
139 	}
140 	if (flock(fd, LOCK_SH | LOCK_NB) == -1) {
141 		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
142 		    : got_error_from_errno2("flock", path));
143 		goto done;
144 	}
145 
146 	if (fstat(fd, &sb) != 0) {
147 		err = got_error_from_errno2("fstat", path);
148 		goto done;
149 	}
150 	*content = calloc(1, sb.st_size);
151 	if (*content == NULL) {
152 		err = got_error_from_errno("calloc");
153 		goto done;
154 	}
155 
156 	n = read(fd, *content, sb.st_size);
157 	if (n != sb.st_size) {
158 		err = (n == -1 ? got_error_from_errno2("read", path) :
159 		    got_error_path(path, GOT_ERR_WORKTREE_META));
160 		goto done;
161 	}
162 	if ((*content)[sb.st_size - 1] != '\n') {
163 		err = got_error_path(path, GOT_ERR_WORKTREE_META);
164 		goto done;
165 	}
166 	(*content)[sb.st_size - 1] = '\0';
167 
168 done:
169 	if (fd != -1 && close(fd) == -1 && err == NULL)
170 		err = got_error_from_errno2("close", path_got);
171 	free(path);
172 	if (err) {
173 		free(*content);
174 		*content = NULL;
175 	}
176 	return err;
177 }
178 
179 static const struct got_error *
180 write_head_ref(const char *path_got, struct got_reference *head_ref)
181 {
182 	const struct got_error *err = NULL;
183 	char *refstr = NULL;
184 
185 	if (got_ref_is_symbolic(head_ref)) {
186 		refstr = got_ref_to_str(head_ref);
187 		if (refstr == NULL)
188 			return got_error_from_errno("got_ref_to_str");
189 	} else {
190 		refstr = strdup(got_ref_get_name(head_ref));
191 		if (refstr == NULL)
192 			return got_error_from_errno("strdup");
193 	}
194 	err = update_meta_file(path_got, GOT_WORKTREE_HEAD_REF, refstr);
195 	free(refstr);
196 	return err;
197 }
198 
199 const struct got_error *
200 got_worktree_init(const char *path, struct got_reference *head_ref,
201     const char *prefix, struct got_repository *repo)
202 {
203 	const struct got_error *err = NULL;
204 	struct got_object_id *commit_id = NULL;
205 	uuid_t uuid;
206 	uint32_t uuid_status;
207 	int obj_type;
208 	char *path_got = NULL;
209 	char *formatstr = NULL;
210 	char *absprefix = NULL;
211 	char *basestr = NULL;
212 	char *uuidstr = NULL;
213 
214 	if (strcmp(path, got_repo_get_path(repo)) == 0) {
215 		err = got_error(GOT_ERR_WORKTREE_REPO);
216 		goto done;
217 	}
218 
219 	err = got_ref_resolve(&commit_id, repo, head_ref);
220 	if (err)
221 		return err;
222 	err = got_object_get_type(&obj_type, repo, commit_id);
223 	if (err)
224 		return err;
225 	if (obj_type != GOT_OBJ_TYPE_COMMIT)
226 		return got_error(GOT_ERR_OBJ_TYPE);
227 
228 	if (!got_path_is_absolute(prefix)) {
229 		if (asprintf(&absprefix, "/%s", prefix) == -1)
230 			return got_error_from_errno("asprintf");
231 	}
232 
233 	/* Create top-level directory (may already exist). */
234 	if (mkdir(path, GOT_DEFAULT_DIR_MODE) == -1 && errno != EEXIST) {
235 		err = got_error_from_errno2("mkdir", path);
236 		goto done;
237 	}
238 
239 	/* Create .got directory (may already exist). */
240 	if (asprintf(&path_got, "%s/%s", path, GOT_WORKTREE_GOT_DIR) == -1) {
241 		err = got_error_from_errno("asprintf");
242 		goto done;
243 	}
244 	if (mkdir(path_got, GOT_DEFAULT_DIR_MODE) == -1 && errno != EEXIST) {
245 		err = got_error_from_errno2("mkdir", path_got);
246 		goto done;
247 	}
248 
249 	/* Create an empty lock file. */
250 	err = create_meta_file(path_got, GOT_WORKTREE_LOCK, NULL);
251 	if (err)
252 		goto done;
253 
254 	/* Create an empty file index. */
255 	err = create_meta_file(path_got, GOT_WORKTREE_FILE_INDEX, NULL);
256 	if (err)
257 		goto done;
258 
259 	/* Write the HEAD reference. */
260 	err = write_head_ref(path_got, head_ref);
261 	if (err)
262 		goto done;
263 
264 	/* Record our base commit. */
265 	err = got_object_id_str(&basestr, commit_id);
266 	if (err)
267 		goto done;
268 	err = create_meta_file(path_got, GOT_WORKTREE_BASE_COMMIT, basestr);
269 	if (err)
270 		goto done;
271 
272 	/* Store path to repository. */
273 	err = create_meta_file(path_got, GOT_WORKTREE_REPOSITORY,
274 	    got_repo_get_path(repo));
275 	if (err)
276 		goto done;
277 
278 	/* Store in-repository path prefix. */
279 	err = create_meta_file(path_got, GOT_WORKTREE_PATH_PREFIX,
280 	    absprefix ? absprefix : prefix);
281 	if (err)
282 		goto done;
283 
284 	/* Generate UUID. */
285 	uuid_create(&uuid, &uuid_status);
286 	if (uuid_status != uuid_s_ok) {
287 		err = got_error_uuid(uuid_status);
288 		goto done;
289 	}
290 	uuid_to_string(&uuid, &uuidstr, &uuid_status);
291 	if (uuid_status != uuid_s_ok) {
292 		err = got_error_uuid(uuid_status);
293 		goto done;
294 	}
295 	err = create_meta_file(path_got, GOT_WORKTREE_UUID, uuidstr);
296 	if (err)
297 		goto done;
298 
299 	/* Stamp work tree with format file. */
300 	if (asprintf(&formatstr, "%d", GOT_WORKTREE_FORMAT_VERSION) == -1) {
301 		err = got_error_from_errno("asprintf");
302 		goto done;
303 	}
304 	err = create_meta_file(path_got, GOT_WORKTREE_FORMAT, formatstr);
305 	if (err)
306 		goto done;
307 
308 done:
309 	free(commit_id);
310 	free(path_got);
311 	free(formatstr);
312 	free(absprefix);
313 	free(basestr);
314 	free(uuidstr);
315 	return err;
316 }
317 
318 static const struct got_error *
319 open_worktree(struct got_worktree **worktree, const char *path)
320 {
321 	const struct got_error *err = NULL;
322 	char *path_got;
323 	char *formatstr = NULL;
324 	char *uuidstr = NULL;
325 	char *path_lock = NULL;
326 	char *base_commit_id_str = NULL;
327 	int version, fd = -1;
328 	const char *errstr;
329 	struct got_repository *repo = NULL;
330 	uint32_t uuid_status;
331 
332 	*worktree = NULL;
333 
334 	if (asprintf(&path_got, "%s/%s", path, GOT_WORKTREE_GOT_DIR) == -1) {
335 		err = got_error_from_errno("asprintf");
336 		path_got = NULL;
337 		goto done;
338 	}
339 
340 	if (asprintf(&path_lock, "%s/%s", path_got, GOT_WORKTREE_LOCK) == -1) {
341 		err = got_error_from_errno("asprintf");
342 		path_lock = NULL;
343 		goto done;
344 	}
345 
346 	fd = open(path_lock, O_RDWR | O_EXLOCK | O_NONBLOCK);
347 	if (fd == -1) {
348 		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
349 		    : got_error_from_errno2("open", path_lock));
350 		goto done;
351 	}
352 
353 	err = read_meta_file(&formatstr, path_got, GOT_WORKTREE_FORMAT);
354 	if (err)
355 		goto done;
356 
357 	version = strtonum(formatstr, 1, INT_MAX, &errstr);
358 	if (errstr) {
359 		err = got_error_msg(GOT_ERR_WORKTREE_META,
360 		    "could not parse work tree format version number");
361 		goto done;
362 	}
363 	if (version != GOT_WORKTREE_FORMAT_VERSION) {
364 		err = got_error(GOT_ERR_WORKTREE_VERS);
365 		goto done;
366 	}
367 
368 	*worktree = calloc(1, sizeof(**worktree));
369 	if (*worktree == NULL) {
370 		err = got_error_from_errno("calloc");
371 		goto done;
372 	}
373 	(*worktree)->lockfd = -1;
374 
375 	(*worktree)->root_path = strdup(path);
376 	if ((*worktree)->root_path == NULL) {
377 		err = got_error_from_errno("strdup");
378 		goto done;
379 	}
380 	err = read_meta_file(&(*worktree)->repo_path, path_got,
381 	    GOT_WORKTREE_REPOSITORY);
382 	if (err)
383 		goto done;
384 
385 	err = read_meta_file(&(*worktree)->path_prefix, path_got,
386 	    GOT_WORKTREE_PATH_PREFIX);
387 	if (err)
388 		goto done;
389 
390 	err = read_meta_file(&base_commit_id_str, path_got,
391 	    GOT_WORKTREE_BASE_COMMIT);
392 	if (err)
393 		goto done;
394 
395 	err = read_meta_file(&uuidstr, path_got, GOT_WORKTREE_UUID);
396 	if (err)
397 		goto done;
398 	uuid_from_string(uuidstr, &(*worktree)->uuid, &uuid_status);
399 	if (uuid_status != uuid_s_ok) {
400 		err = got_error_uuid(uuid_status);
401 		goto done;
402 	}
403 
404 	err = got_repo_open(&repo, (*worktree)->repo_path);
405 	if (err)
406 		goto done;
407 
408 	err = got_object_resolve_id_str(&(*worktree)->base_commit_id, repo,
409 	    base_commit_id_str);
410 	if (err)
411 		goto done;
412 
413 	err = read_meta_file(&(*worktree)->head_ref_name, path_got,
414 	    GOT_WORKTREE_HEAD_REF);
415 done:
416 	if (repo)
417 		got_repo_close(repo);
418 	free(path_got);
419 	free(path_lock);
420 	free(base_commit_id_str);
421 	free(uuidstr);
422 	free(formatstr);
423 	if (err) {
424 		if (fd != -1)
425 			close(fd);
426 		if (*worktree != NULL)
427 			got_worktree_close(*worktree);
428 		*worktree = NULL;
429 	} else
430 		(*worktree)->lockfd = fd;
431 
432 	return err;
433 }
434 
435 const struct got_error *
436 got_worktree_open(struct got_worktree **worktree, const char *path)
437 {
438 	const struct got_error *err = NULL;
439 
440 	do {
441 		err = open_worktree(worktree, path);
442 		if (err && !(err->code == GOT_ERR_ERRNO && errno == ENOENT))
443 			return err;
444 		if (*worktree)
445 			return NULL;
446 		path = dirname(path);
447 		if (path == NULL)
448 			return got_error_from_errno2("dirname", path);
449 	} while (!((path[0] == '.' || path[0] == '/') && path[1] == '\0'));
450 
451 	return got_error(GOT_ERR_NOT_WORKTREE);
452 }
453 
454 const struct got_error *
455 got_worktree_close(struct got_worktree *worktree)
456 {
457 	const struct got_error *err = NULL;
458 	free(worktree->root_path);
459 	free(worktree->repo_path);
460 	free(worktree->path_prefix);
461 	free(worktree->base_commit_id);
462 	free(worktree->head_ref_name);
463 	if (worktree->lockfd != -1)
464 		if (close(worktree->lockfd) != 0)
465 			err = got_error_from_errno2("close",
466 			    got_worktree_get_root_path(worktree));
467 	free(worktree);
468 	return err;
469 }
470 
471 const char *
472 got_worktree_get_root_path(struct got_worktree *worktree)
473 {
474 	return worktree->root_path;
475 }
476 
477 const char *
478 got_worktree_get_repo_path(struct got_worktree *worktree)
479 {
480 	return worktree->repo_path;
481 }
482 
483 const char *
484 got_worktree_get_path_prefix(struct got_worktree *worktree)
485 {
486 	return worktree->path_prefix;
487 }
488 
489 const struct got_error *
490 got_worktree_match_path_prefix(int *match, struct got_worktree *worktree,
491     const char *path_prefix)
492 {
493 	char *absprefix = NULL;
494 
495 	if (!got_path_is_absolute(path_prefix)) {
496 		if (asprintf(&absprefix, "/%s", path_prefix) == -1)
497 			return got_error_from_errno("asprintf");
498 	}
499 	*match = (strcmp(absprefix ? absprefix : path_prefix,
500 	    worktree->path_prefix) == 0);
501 	free(absprefix);
502 	return NULL;
503 }
504 
505 const char *
506 got_worktree_get_head_ref_name(struct got_worktree *worktree)
507 {
508 	return worktree->head_ref_name;
509 }
510 
511 const struct got_error *
512 got_worktree_set_head_ref(struct got_worktree *worktree,
513     struct got_reference *head_ref)
514 {
515 	const struct got_error *err = NULL;
516 	char *path_got = NULL, *head_ref_name = NULL;
517 
518 	if (asprintf(&path_got, "%s/%s", worktree->root_path,
519 	    GOT_WORKTREE_GOT_DIR) == -1) {
520 		err = got_error_from_errno("asprintf");
521 		path_got = NULL;
522 		goto done;
523 	}
524 
525 	head_ref_name = strdup(got_ref_get_name(head_ref));
526 	if (head_ref_name == NULL) {
527 		err = got_error_from_errno("strdup");
528 		goto done;
529 	}
530 
531 	err = write_head_ref(path_got, head_ref);
532 	if (err)
533 		goto done;
534 
535 	free(worktree->head_ref_name);
536 	worktree->head_ref_name = head_ref_name;
537 done:
538 	free(path_got);
539 	if (err)
540 		free(head_ref_name);
541 	return err;
542 }
543 
544 struct got_object_id *
545 got_worktree_get_base_commit_id(struct got_worktree *worktree)
546 {
547 	return worktree->base_commit_id;
548 }
549 
550 const struct got_error *
551 got_worktree_set_base_commit_id(struct got_worktree *worktree,
552     struct got_repository *repo, struct got_object_id *commit_id)
553 {
554 	const struct got_error *err;
555 	struct got_object *obj = NULL;
556 	char *id_str = NULL;
557 	char *path_got = NULL;
558 
559 	if (asprintf(&path_got, "%s/%s", worktree->root_path,
560 	    GOT_WORKTREE_GOT_DIR) == -1) {
561 		err = got_error_from_errno("asprintf");
562 		path_got = NULL;
563 		goto done;
564 	}
565 
566 	err = got_object_open(&obj, repo, commit_id);
567 	if (err)
568 		return err;
569 
570 	if (obj->type != GOT_OBJ_TYPE_COMMIT) {
571 		err = got_error(GOT_ERR_OBJ_TYPE);
572 		goto done;
573 	}
574 
575 	/* Record our base commit. */
576 	err = got_object_id_str(&id_str, commit_id);
577 	if (err)
578 		goto done;
579 	err = update_meta_file(path_got, GOT_WORKTREE_BASE_COMMIT, id_str);
580 	if (err)
581 		goto done;
582 
583 	free(worktree->base_commit_id);
584 	worktree->base_commit_id = got_object_id_dup(commit_id);
585 	if (worktree->base_commit_id == NULL) {
586 		err = got_error_from_errno("got_object_id_dup");
587 		goto done;
588 	}
589 done:
590 	if (obj)
591 		got_object_close(obj);
592 	free(id_str);
593 	free(path_got);
594 	return err;
595 }
596 
597 static const struct got_error *
598 lock_worktree(struct got_worktree *worktree, int operation)
599 {
600 	if (flock(worktree->lockfd, operation | LOCK_NB) == -1)
601 		return (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
602 		    : got_error_from_errno2("flock",
603 		    got_worktree_get_root_path(worktree)));
604 	return NULL;
605 }
606 
607 static const struct got_error *
608 add_dir_on_disk(struct got_worktree *worktree, const char *path)
609 {
610 	const struct got_error *err = NULL;
611 	char *abspath;
612 
613 	if (asprintf(&abspath, "%s/%s", worktree->root_path, path) == -1)
614 		return got_error_from_errno("asprintf");
615 
616 	err = got_path_mkdir(abspath);
617 	if (err && err->code == GOT_ERR_ERRNO && errno == EEXIST) {
618 		struct stat sb;
619 		err = NULL;
620 		if (lstat(abspath, &sb) == -1) {
621 			err = got_error_from_errno2("lstat", abspath);
622 		} else if (!S_ISDIR(sb.st_mode)) {
623 			/* TODO directory is obstructed; do something */
624 			err = got_error(GOT_ERR_FILE_OBSTRUCTED);
625 		}
626 	}
627 	free(abspath);
628 	return err;
629 }
630 
631 static const struct got_error *
632 check_file_contents_equal(int *same, FILE *f1, FILE *f2)
633 {
634 	const struct got_error *err = NULL;
635 	uint8_t fbuf1[8192];
636 	uint8_t fbuf2[8192];
637 	size_t flen1 = 0, flen2 = 0;
638 
639 	*same = 1;
640 
641 	for (;;) {
642 		flen1 = fread(fbuf1, 1, sizeof(fbuf1), f1);
643 		if (flen1 == 0 && ferror(f1)) {
644 			err = got_error_from_errno("fread");
645 			break;
646 		}
647 		flen2 = fread(fbuf2, 1, sizeof(fbuf2), f2);
648 		if (flen2 == 0 && ferror(f2)) {
649 			err = got_error_from_errno("fread");
650 			break;
651 		}
652 		if (flen1 == 0) {
653 			if (flen2 != 0)
654 				*same = 0;
655 			break;
656 		} else if (flen2 == 0) {
657 			if (flen1 != 0)
658 				*same = 0;
659 			break;
660 		} else if (flen1 == flen2) {
661 			if (memcmp(fbuf1, fbuf2, flen2) != 0) {
662 				*same = 0;
663 				break;
664 			}
665 		} else {
666 			*same = 0;
667 			break;
668 		}
669 	}
670 
671 	return err;
672 }
673 
674 static const struct got_error *
675 check_files_equal(int *same, const char *f1_path, const char *f2_path)
676 {
677 	const struct got_error *err = NULL;
678 	struct stat sb;
679 	size_t size1, size2;
680 	FILE *f1 = NULL, *f2 = NULL;
681 
682 	*same = 1;
683 
684 	if (lstat(f1_path, &sb) != 0) {
685 		err = got_error_from_errno2("lstat", f1_path);
686 		goto done;
687 	}
688 	size1 = sb.st_size;
689 
690 	if (lstat(f2_path, &sb) != 0) {
691 		err = got_error_from_errno2("lstat", f2_path);
692 		goto done;
693 	}
694 	size2 = sb.st_size;
695 
696 	if (size1 != size2) {
697 		*same = 0;
698 		return NULL;
699 	}
700 
701 	f1 = fopen(f1_path, "r");
702 	if (f1 == NULL)
703 		return got_error_from_errno2("open", f1_path);
704 
705 	f2 = fopen(f2_path, "r");
706 	if (f2 == NULL) {
707 		err = got_error_from_errno2("open", f2_path);
708 		goto done;
709 	}
710 
711 	err = check_file_contents_equal(same, f1, f2);
712 done:
713 	if (f1 && fclose(f1) != 0 && err == NULL)
714 		err = got_error_from_errno("fclose");
715 	if (f2 && fclose(f2) != 0 && err == NULL)
716 		err = got_error_from_errno("fclose");
717 
718 	return err;
719 }
720 
721 /*
722  * Perform a 3-way merge where blob_orig acts as the common ancestor,
723  * the file at deriv_path acts as the first derived version, and the
724  * file on disk acts as the second derived version.
725  */
726 static const struct got_error *
727 merge_file(int *local_changes_subsumed, struct got_worktree *worktree,
728     struct got_blob_object *blob_orig, const char *ondisk_path,
729     const char *path, uint16_t st_mode, const char *deriv_path,
730     const char *label_deriv, struct got_repository *repo,
731     got_worktree_checkout_cb progress_cb, void *progress_arg)
732 {
733 	const struct got_error *err = NULL;
734 	int merged_fd = -1;
735 	FILE *f_orig = NULL;
736 	char *blob_orig_path = NULL;
737 	char *merged_path = NULL, *base_path = NULL;
738 	int overlapcnt = 0;
739 	char *parent;
740 
741 	*local_changes_subsumed = 0;
742 
743 	parent = dirname(ondisk_path);
744 	if (parent == NULL)
745 		return got_error_from_errno2("dirname", ondisk_path);
746 
747 	if (asprintf(&base_path, "%s/got-merged", parent) == -1)
748 		return got_error_from_errno("asprintf");
749 
750 	err = got_opentemp_named_fd(&merged_path, &merged_fd, base_path);
751 	if (err)
752 		goto done;
753 
754 	free(base_path);
755 	if (asprintf(&base_path, "%s/got-merge-blob-orig", parent) == -1) {
756 		err = got_error_from_errno("asprintf");
757 		base_path = NULL;
758 		goto done;
759 	}
760 
761 	err = got_opentemp_named(&blob_orig_path, &f_orig, base_path);
762 	if (err)
763 		goto done;
764 	if (blob_orig) {
765 		err = got_object_blob_dump_to_file(NULL, NULL, NULL, f_orig,
766 		    blob_orig);
767 		if (err)
768 			goto done;
769 	} else {
770 		/*
771 		 * If the file has no blob, this is an "add vs add" conflict,
772 		 * and we simply use an empty ancestor file to make both files
773 		 * appear in the merged result in their entirety.
774 		 */
775 	}
776 
777 	err = got_merge_diff3(&overlapcnt, merged_fd, deriv_path,
778 	    blob_orig_path, ondisk_path, label_deriv, path);
779 	if (err)
780 		goto done;
781 
782 	err = (*progress_cb)(progress_arg,
783 	    overlapcnt > 0 ? GOT_STATUS_CONFLICT : GOT_STATUS_MERGE, path);
784 	if (err)
785 		goto done;
786 
787 	if (fsync(merged_fd) != 0) {
788 		err = got_error_from_errno("fsync");
789 		goto done;
790 	}
791 
792 	/* Check if a clean merge has subsumed all local changes. */
793 	if (overlapcnt == 0) {
794 		err = check_files_equal(local_changes_subsumed, deriv_path,
795 		    merged_path);
796 		if (err)
797 			goto done;
798 	}
799 
800 	if (chmod(merged_path, st_mode) != 0) {
801 		err = got_error_from_errno2("chmod", merged_path);
802 		goto done;
803 	}
804 
805 	if (rename(merged_path, ondisk_path) != 0) {
806 		err = got_error_from_errno3("rename", merged_path,
807 		    ondisk_path);
808 		unlink(merged_path);
809 		goto done;
810 	}
811 
812 done:
813 	if (merged_fd != -1 && close(merged_fd) != 0 && err == NULL)
814 		err = got_error_from_errno("close");
815 	if (f_orig && fclose(f_orig) != 0 && err == NULL)
816 		err = got_error_from_errno("fclose");
817 	free(merged_path);
818 	free(base_path);
819 	if (blob_orig_path) {
820 		unlink(blob_orig_path);
821 		free(blob_orig_path);
822 	}
823 	return err;
824 }
825 
826 /*
827  * Perform a 3-way merge where blob_orig acts as the common ancestor,
828  * blob_deriv acts as the first derived version, and the file on disk
829  * acts as the second derived version.
830  */
831 static const struct got_error *
832 merge_blob(int *local_changes_subsumed, struct got_worktree *worktree,
833     struct got_blob_object *blob_orig, const char *ondisk_path,
834     const char *path, uint16_t st_mode, struct got_blob_object *blob_deriv,
835     struct got_object_id *deriv_base_commit_id,
836     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
837     void *progress_arg)
838 {
839 	const struct got_error *err = NULL;
840 	FILE *f_deriv = NULL;
841 	char *blob_deriv_path = NULL, *base_path = NULL, *id_str = NULL;
842 	char *label_deriv = NULL, *parent;
843 
844 	*local_changes_subsumed = 0;
845 
846 	parent = dirname(ondisk_path);
847 	if (parent == NULL)
848 		return got_error_from_errno2("dirname", ondisk_path);
849 
850 	free(base_path);
851 	if (asprintf(&base_path, "%s/got-merge-blob-deriv", parent) == -1) {
852 		err = got_error_from_errno("asprintf");
853 		base_path = NULL;
854 		goto done;
855 	}
856 
857 	err = got_opentemp_named(&blob_deriv_path, &f_deriv, base_path);
858 	if (err)
859 		goto done;
860 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f_deriv,
861 	    blob_deriv);
862 	if (err)
863 		goto done;
864 
865 	err = got_object_id_str(&id_str, deriv_base_commit_id);
866 	if (err)
867 		goto done;
868 	if (asprintf(&label_deriv, "commit %s", id_str) == -1) {
869 		err = got_error_from_errno("asprintf");
870 		goto done;
871 	}
872 
873 	err = merge_file(local_changes_subsumed, worktree, blob_orig,
874 	    ondisk_path, path, st_mode, blob_deriv_path, label_deriv,
875 	    repo, progress_cb, progress_arg);
876 done:
877 	if (f_deriv && fclose(f_deriv) != 0 && err == NULL)
878 		err = got_error_from_errno("fclose");
879 	free(base_path);
880 	if (blob_deriv_path) {
881 		unlink(blob_deriv_path);
882 		free(blob_deriv_path);
883 	}
884 	free(id_str);
885 	free(label_deriv);
886 	return err;
887 }
888 
889 static const struct got_error *
890 update_blob_fileindex_entry(struct got_worktree *worktree,
891     struct got_fileindex *fileindex, struct got_fileindex_entry *ie,
892     const char *ondisk_path, const char *path, struct got_blob_object *blob,
893     int update_timestamps)
894 {
895 	const struct got_error *err = NULL;
896 
897 	if (ie == NULL)
898 		ie = got_fileindex_entry_get(fileindex, path, strlen(path));
899 	if (ie)
900 		err = got_fileindex_entry_update(ie, ondisk_path,
901 		    blob->id.sha1, worktree->base_commit_id->sha1,
902 		    update_timestamps);
903 	else {
904 		struct got_fileindex_entry *new_ie;
905 		err = got_fileindex_entry_alloc(&new_ie, ondisk_path,
906 		    path, blob->id.sha1, worktree->base_commit_id->sha1);
907 		if (!err)
908 			err = got_fileindex_entry_add(fileindex, new_ie);
909 	}
910 	return err;
911 }
912 
913 static const struct got_error *
914 install_blob(struct got_worktree *worktree, const char *ondisk_path,
915    const char *path, uint16_t te_mode, uint16_t st_mode,
916    struct got_blob_object *blob, int restoring_missing_file,
917    int reverting_versioned_file, struct got_repository *repo,
918    got_worktree_checkout_cb progress_cb, void *progress_arg)
919 {
920 	const struct got_error *err = NULL;
921 	int fd = -1;
922 	size_t len, hdrlen;
923 	int update = 0;
924 	char *tmppath = NULL;
925 
926 	fd = open(ondisk_path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW,
927 	    GOT_DEFAULT_FILE_MODE);
928 	if (fd == -1) {
929 		if (errno == ENOENT) {
930 			char *parent = dirname(path);
931 			if (parent == NULL)
932 				return got_error_from_errno2("dirname", path);
933 			err = add_dir_on_disk(worktree, parent);
934 			if (err)
935 				return err;
936 			fd = open(ondisk_path,
937 			    O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW,
938 			    GOT_DEFAULT_FILE_MODE);
939 			if (fd == -1)
940 				return got_error_from_errno2("open",
941 				    ondisk_path);
942 		} else if (errno == EEXIST) {
943 			if (!S_ISREG(st_mode)) {
944 				/* TODO file is obstructed; do something */
945 				err = got_error(GOT_ERR_FILE_OBSTRUCTED);
946 				goto done;
947 			} else {
948 				err = got_opentemp_named_fd(&tmppath, &fd,
949 				    ondisk_path);
950 				if (err)
951 					goto done;
952 				update = 1;
953 			}
954 		} else
955 			return got_error_from_errno2("open", ondisk_path);
956 	}
957 
958 	if (restoring_missing_file)
959 		err = (*progress_cb)(progress_arg, GOT_STATUS_MISSING, path);
960 	else if (reverting_versioned_file)
961 		err = (*progress_cb)(progress_arg, GOT_STATUS_REVERT, path);
962 	else
963 		err = (*progress_cb)(progress_arg,
964 		    update ? GOT_STATUS_UPDATE : GOT_STATUS_ADD, path);
965 	if (err)
966 		goto done;
967 
968 	hdrlen = got_object_blob_get_hdrlen(blob);
969 	do {
970 		const uint8_t *buf = got_object_blob_get_read_buf(blob);
971 		err = got_object_blob_read_block(&len, blob);
972 		if (err)
973 			break;
974 		if (len > 0) {
975 			/* Skip blob object header first time around. */
976 			ssize_t outlen = write(fd, buf + hdrlen, len - hdrlen);
977 			if (outlen == -1) {
978 				err = got_error_from_errno("write");
979 				goto done;
980 			} else if (outlen != len - hdrlen) {
981 				err = got_error(GOT_ERR_IO);
982 				goto done;
983 			}
984 			hdrlen = 0;
985 		}
986 	} while (len != 0);
987 
988 	if (fsync(fd) != 0) {
989 		err = got_error_from_errno("fsync");
990 		goto done;
991 	}
992 
993 	if (update) {
994 		if (rename(tmppath, ondisk_path) != 0) {
995 			err = got_error_from_errno3("rename", tmppath,
996 			    ondisk_path);
997 			unlink(tmppath);
998 			goto done;
999 		}
1000 	}
1001 
1002 	if (te_mode & S_IXUSR) {
1003 		if (chmod(ondisk_path, st_mode | S_IXUSR) == -1) {
1004 			err = got_error_from_errno2("chmod", ondisk_path);
1005 			goto done;
1006 		}
1007 	} else {
1008 		if (chmod(ondisk_path, st_mode & ~S_IXUSR) == -1) {
1009 			err = got_error_from_errno2("chmod", ondisk_path);
1010 			goto done;
1011 		}
1012 	}
1013 
1014 done:
1015 	if (fd != -1 && close(fd) != 0 && err == NULL)
1016 		err = got_error_from_errno("close");
1017 	free(tmppath);
1018 	return err;
1019 }
1020 
1021 /* Upgrade STATUS_MODIFY to STATUS_CONFLICT if a conflict marker is found. */
1022 static const struct got_error *
1023 get_modified_file_content_status(unsigned char *status, FILE *f)
1024 {
1025 	const struct got_error *err = NULL;
1026 	const char *markers[3] = {
1027 		GOT_DIFF_CONFLICT_MARKER_BEGIN,
1028 		GOT_DIFF_CONFLICT_MARKER_SEP,
1029 		GOT_DIFF_CONFLICT_MARKER_END
1030 	};
1031 	int i = 0;
1032 	char *line;
1033 	size_t len;
1034 	const char delim[3] = {'\0', '\0', '\0'};
1035 
1036 	while (*status == GOT_STATUS_MODIFY) {
1037 		line = fparseln(f, &len, NULL, delim, 0);
1038 		if (line == NULL) {
1039 			if (feof(f))
1040 				break;
1041 			err = got_ferror(f, GOT_ERR_IO);
1042 			break;
1043 		}
1044 
1045 		if (strncmp(line, markers[i], strlen(markers[i])) == 0) {
1046 			if (strcmp(markers[i], GOT_DIFF_CONFLICT_MARKER_END)
1047 			    == 0)
1048 				*status = GOT_STATUS_CONFLICT;
1049 			else
1050 				i++;
1051 		}
1052 	}
1053 
1054 	return err;
1055 }
1056 
1057 static int
1058 stat_info_differs(struct got_fileindex_entry *ie, struct stat *sb)
1059 {
1060 	return !(ie->ctime_sec == sb->st_ctime &&
1061 	    ie->ctime_nsec == sb->st_ctimensec &&
1062 	    ie->mtime_sec == sb->st_mtime &&
1063 	    ie->mtime_nsec == sb->st_mtimensec &&
1064 	    ie->size == (sb->st_size & 0xffffffff));
1065 }
1066 
1067 static unsigned char
1068 get_staged_status(struct got_fileindex_entry *ie)
1069 {
1070 	switch (got_fileindex_entry_stage_get(ie)) {
1071 	case GOT_FILEIDX_STAGE_ADD:
1072 		return GOT_STATUS_ADD;
1073 	case GOT_FILEIDX_STAGE_DELETE:
1074 		return GOT_STATUS_DELETE;
1075 	case GOT_FILEIDX_STAGE_MODIFY:
1076 		return GOT_STATUS_MODIFY;
1077 	default:
1078 		return GOT_STATUS_NO_CHANGE;
1079 	}
1080 }
1081 
1082 static const struct got_error *
1083 get_file_status(unsigned char *status, struct stat *sb,
1084     struct got_fileindex_entry *ie, const char *abspath,
1085     struct got_repository *repo)
1086 {
1087 	const struct got_error *err = NULL;
1088 	struct got_object_id id;
1089 	size_t hdrlen;
1090 	FILE *f = NULL;
1091 	uint8_t fbuf[8192];
1092 	struct got_blob_object *blob = NULL;
1093 	size_t flen, blen;
1094 	unsigned char staged_status = get_staged_status(ie);
1095 
1096 	*status = GOT_STATUS_NO_CHANGE;
1097 
1098 	if (lstat(abspath, sb) == -1) {
1099 		if (errno == ENOENT) {
1100 			if (got_fileindex_entry_has_file_on_disk(ie))
1101 				*status = GOT_STATUS_MISSING;
1102 			else
1103 				*status = GOT_STATUS_DELETE;
1104 			return NULL;
1105 		}
1106 		return got_error_from_errno2("lstat", abspath);
1107 	}
1108 
1109 	if (!S_ISREG(sb->st_mode)) {
1110 		*status = GOT_STATUS_OBSTRUCTED;
1111 		return NULL;
1112 	}
1113 
1114 	if (!got_fileindex_entry_has_file_on_disk(ie)) {
1115 		*status = GOT_STATUS_DELETE;
1116 		return NULL;
1117 	} else if (!got_fileindex_entry_has_blob(ie) &&
1118 	    staged_status != GOT_STATUS_ADD) {
1119 		*status = GOT_STATUS_ADD;
1120 		return NULL;
1121 	}
1122 
1123 	if (!stat_info_differs(ie, sb))
1124 		return NULL;
1125 
1126 	if (staged_status == GOT_STATUS_MODIFY ||
1127 	    staged_status == GOT_STATUS_ADD)
1128 		memcpy(id.sha1, ie->staged_blob_sha1, sizeof(id.sha1));
1129 	else
1130 		memcpy(id.sha1, ie->blob_sha1, sizeof(id.sha1));
1131 
1132 	err = got_object_open_as_blob(&blob, repo, &id, sizeof(fbuf));
1133 	if (err)
1134 		return err;
1135 
1136 	f = fopen(abspath, "r");
1137 	if (f == NULL) {
1138 		err = got_error_from_errno2("fopen", abspath);
1139 		goto done;
1140 	}
1141 	hdrlen = got_object_blob_get_hdrlen(blob);
1142 	for (;;) {
1143 		const uint8_t *bbuf = got_object_blob_get_read_buf(blob);
1144 		err = got_object_blob_read_block(&blen, blob);
1145 		if (err)
1146 			goto done;
1147 		/* Skip length of blob object header first time around. */
1148 		flen = fread(fbuf, 1, sizeof(fbuf) - hdrlen, f);
1149 		if (flen == 0 && ferror(f)) {
1150 			err = got_error_from_errno("fread");
1151 			goto done;
1152 		}
1153 		if (blen == 0) {
1154 			if (flen != 0)
1155 				*status = GOT_STATUS_MODIFY;
1156 			break;
1157 		} else if (flen == 0) {
1158 			if (blen != 0)
1159 				*status = GOT_STATUS_MODIFY;
1160 			break;
1161 		} else if (blen - hdrlen == flen) {
1162 			/* Skip blob object header first time around. */
1163 			if (memcmp(bbuf + hdrlen, fbuf, flen) != 0) {
1164 				*status = GOT_STATUS_MODIFY;
1165 				break;
1166 			}
1167 		} else {
1168 			*status = GOT_STATUS_MODIFY;
1169 			break;
1170 		}
1171 		hdrlen = 0;
1172 	}
1173 
1174 	if (*status == GOT_STATUS_MODIFY) {
1175 		rewind(f);
1176 		err = get_modified_file_content_status(status, f);
1177 	}
1178 done:
1179 	if (blob)
1180 		got_object_blob_close(blob);
1181 	if (f)
1182 		fclose(f);
1183 	return err;
1184 }
1185 
1186 /*
1187  * Update timestamps in the file index if a file is unmodified and
1188  * we had to run a full content comparison to find out.
1189  */
1190 static const struct got_error *
1191 sync_timestamps(char *ondisk_path, unsigned char status,
1192     struct got_fileindex_entry *ie, struct stat *sb)
1193 {
1194 	if (status == GOT_STATUS_NO_CHANGE && stat_info_differs(ie, sb))
1195 		return got_fileindex_entry_update(ie, ondisk_path,
1196 		    ie->blob_sha1, ie->commit_sha1, 1);
1197 
1198 	return NULL;
1199 }
1200 
1201 static const struct got_error *
1202 update_blob(struct got_worktree *worktree,
1203     struct got_fileindex *fileindex, struct got_fileindex_entry *ie,
1204     struct got_tree_entry *te, const char *path,
1205     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
1206     void *progress_arg)
1207 {
1208 	const struct got_error *err = NULL;
1209 	struct got_blob_object *blob = NULL;
1210 	char *ondisk_path;
1211 	unsigned char status = GOT_STATUS_NO_CHANGE;
1212 	struct stat sb;
1213 
1214 	if (asprintf(&ondisk_path, "%s/%s", worktree->root_path, path) == -1)
1215 		return got_error_from_errno("asprintf");
1216 
1217 	if (ie) {
1218 		if (get_staged_status(ie) != GOT_STATUS_NO_CHANGE) {
1219 			err = got_error_path(ie->path, GOT_ERR_FILE_STAGED);
1220 			goto done;
1221 		}
1222 		err = get_file_status(&status, &sb, ie, ondisk_path, repo);
1223 		if (err)
1224 			goto done;
1225 		if (status == GOT_STATUS_MISSING || status == GOT_STATUS_DELETE)
1226 			sb.st_mode = got_fileindex_perms_to_st(ie);
1227 	} else
1228 		sb.st_mode = GOT_DEFAULT_FILE_MODE;
1229 
1230 	if (status == GOT_STATUS_OBSTRUCTED) {
1231 		err = (*progress_cb)(progress_arg, status, path);
1232 		goto done;
1233 	}
1234 
1235 	if (ie && status != GOT_STATUS_MISSING) {
1236 		if (got_fileindex_entry_has_commit(ie) &&
1237 		    memcmp(ie->commit_sha1, worktree->base_commit_id->sha1,
1238 		    SHA1_DIGEST_LENGTH) == 0) {
1239 			err = sync_timestamps(ondisk_path, status, ie, &sb);
1240 			if (err)
1241 				goto done;
1242 			err = (*progress_cb)(progress_arg, GOT_STATUS_EXISTS,
1243 			    path);
1244 			goto done;
1245 		}
1246 		if (got_fileindex_entry_has_blob(ie) &&
1247 		    memcmp(ie->blob_sha1, te->id->sha1,
1248 		    SHA1_DIGEST_LENGTH) == 0) {
1249 			err = sync_timestamps(ondisk_path, status, ie, &sb);
1250 			goto done;
1251 		}
1252 	}
1253 
1254 	err = got_object_open_as_blob(&blob, repo, te->id, 8192);
1255 	if (err)
1256 		goto done;
1257 
1258 	if (status == GOT_STATUS_MODIFY || status == GOT_STATUS_ADD) {
1259 		int update_timestamps;
1260 		struct got_blob_object *blob2 = NULL;
1261 		if (got_fileindex_entry_has_blob(ie)) {
1262 			struct got_object_id id2;
1263 			memcpy(id2.sha1, ie->blob_sha1, SHA1_DIGEST_LENGTH);
1264 			err = got_object_open_as_blob(&blob2, repo, &id2, 8192);
1265 			if (err)
1266 				goto done;
1267 		}
1268 		err = merge_blob(&update_timestamps, worktree, blob2,
1269 		    ondisk_path, path, sb.st_mode, blob,
1270 		    worktree->base_commit_id, repo,
1271 		    progress_cb, progress_arg);
1272 		if (blob2)
1273 			got_object_blob_close(blob2);
1274 		/*
1275 		 * Do not update timestamps of files with local changes.
1276 		 * Otherwise, a future status walk would treat them as
1277 		 * unmodified files again.
1278 		 */
1279 		err = got_fileindex_entry_update(ie, ondisk_path,
1280 		    blob->id.sha1, worktree->base_commit_id->sha1,
1281 		    update_timestamps);
1282 	} else if (status == GOT_STATUS_DELETE) {
1283 		err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE, path);
1284 		if (err)
1285 			goto done;
1286 		err = update_blob_fileindex_entry(worktree, fileindex, ie,
1287 		    ondisk_path, path, blob, 0);
1288 		if (err)
1289 			goto done;
1290 	} else {
1291 		err = install_blob(worktree, ondisk_path, path, te->mode,
1292 		    sb.st_mode, blob, status == GOT_STATUS_MISSING, 0,
1293 		    repo, progress_cb, progress_arg);
1294 		if (err)
1295 			goto done;
1296 		err = update_blob_fileindex_entry(worktree, fileindex, ie,
1297 		    ondisk_path, path, blob, 1);
1298 		if (err)
1299 			goto done;
1300 	}
1301 	got_object_blob_close(blob);
1302 done:
1303 	free(ondisk_path);
1304 	return err;
1305 }
1306 
1307 static const struct got_error *
1308 remove_ondisk_file(const char *root_path, const char *path)
1309 {
1310 	const struct got_error *err = NULL;
1311 	char *ondisk_path = NULL;
1312 
1313 	if (asprintf(&ondisk_path, "%s/%s", root_path, path) == -1)
1314 		return got_error_from_errno("asprintf");
1315 
1316 	if (unlink(ondisk_path) == -1) {
1317 		if (errno != ENOENT)
1318 			err = got_error_from_errno2("unlink", ondisk_path);
1319 	} else {
1320 		char *parent = dirname(ondisk_path);
1321 		while (parent && strcmp(parent, root_path) != 0) {
1322 			if (rmdir(parent) == -1) {
1323 				if (errno != ENOTEMPTY)
1324 					err = got_error_from_errno2("rmdir",
1325 					    parent);
1326 				break;
1327 			}
1328 			parent = dirname(parent);
1329 		}
1330 	}
1331 	free(ondisk_path);
1332 	return err;
1333 }
1334 
1335 static const struct got_error *
1336 delete_blob(struct got_worktree *worktree, struct got_fileindex *fileindex,
1337     struct got_fileindex_entry *ie, struct got_repository *repo,
1338     got_worktree_checkout_cb progress_cb, void *progress_arg)
1339 {
1340 	const struct got_error *err = NULL;
1341 	unsigned char status;
1342 	struct stat sb;
1343 	char *ondisk_path;
1344 
1345 	if (get_staged_status(ie) != GOT_STATUS_NO_CHANGE)
1346 		return got_error_path(ie->path, GOT_ERR_FILE_STAGED);
1347 
1348 	if (asprintf(&ondisk_path, "%s/%s", worktree->root_path, ie->path)
1349 	    == -1)
1350 		return got_error_from_errno("asprintf");
1351 
1352 	err = get_file_status(&status, &sb, ie, ondisk_path, repo);
1353 	if (err)
1354 		return err;
1355 
1356 	if (status == GOT_STATUS_MODIFY || status == GOT_STATUS_CONFLICT ||
1357 	    status == GOT_STATUS_ADD) {
1358 		err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE, ie->path);
1359 		if (err)
1360 			return err;
1361 		/*
1362 		 * Preserve the working file and change the deleted blob's
1363 		 * entry into a schedule-add entry.
1364 		 */
1365 		err = got_fileindex_entry_update(ie, ondisk_path, NULL, NULL,
1366 		    0);
1367 		if (err)
1368 			return err;
1369 	} else {
1370 		err = (*progress_cb)(progress_arg, GOT_STATUS_DELETE, ie->path);
1371 		if (err)
1372 			return err;
1373 		if (status == GOT_STATUS_NO_CHANGE) {
1374 			err = remove_ondisk_file(worktree->root_path, ie->path);
1375 			if (err)
1376 				return err;
1377 		}
1378 		got_fileindex_entry_remove(fileindex, ie);
1379 	}
1380 
1381 	return err;
1382 }
1383 
1384 struct diff_cb_arg {
1385     struct got_fileindex *fileindex;
1386     struct got_worktree *worktree;
1387     struct got_repository *repo;
1388     got_worktree_checkout_cb progress_cb;
1389     void *progress_arg;
1390     got_cancel_cb cancel_cb;
1391     void *cancel_arg;
1392 };
1393 
1394 static const struct got_error *
1395 diff_old_new(void *arg, struct got_fileindex_entry *ie,
1396     struct got_tree_entry *te, const char *parent_path)
1397 {
1398 	struct diff_cb_arg *a = arg;
1399 
1400 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
1401 		return got_error(GOT_ERR_CANCELLED);
1402 
1403 	return update_blob(a->worktree, a->fileindex, ie, te,
1404 	    ie->path, a->repo, a->progress_cb, a->progress_arg);
1405 }
1406 
1407 static const struct got_error *
1408 diff_old(void *arg, struct got_fileindex_entry *ie, const char *parent_path)
1409 {
1410 	struct diff_cb_arg *a = arg;
1411 
1412 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
1413 		return got_error(GOT_ERR_CANCELLED);
1414 
1415 	return delete_blob(a->worktree, a->fileindex, ie,
1416 	    a->repo, a->progress_cb, a->progress_arg);
1417 }
1418 
1419 static const struct got_error *
1420 diff_new(void *arg, struct got_tree_entry *te, const char *parent_path)
1421 {
1422 	struct diff_cb_arg *a = arg;
1423 	const struct got_error *err;
1424 	char *path;
1425 
1426 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
1427 		return got_error(GOT_ERR_CANCELLED);
1428 
1429 	if (got_object_tree_entry_is_submodule(te))
1430 		return NULL;
1431 
1432 	if (asprintf(&path, "%s%s%s", parent_path,
1433 	    parent_path[0] ? "/" : "", te->name)
1434 	    == -1)
1435 		return got_error_from_errno("asprintf");
1436 
1437 	if (S_ISDIR(te->mode))
1438 		err = add_dir_on_disk(a->worktree, path);
1439 	else
1440 		err = update_blob(a->worktree, a->fileindex, NULL, te, path,
1441 		    a->repo, a->progress_cb, a->progress_arg);
1442 
1443 	free(path);
1444 	return err;
1445 }
1446 
1447 static const struct got_error *
1448 get_ref_name(char **refname, struct got_worktree *worktree, const char *prefix)
1449 {
1450 	const struct got_error *err = NULL;
1451 	char *uuidstr = NULL;
1452 	uint32_t uuid_status;
1453 
1454 	*refname = NULL;
1455 
1456 	uuid_to_string(&worktree->uuid, &uuidstr, &uuid_status);
1457 	if (uuid_status != uuid_s_ok)
1458 		return got_error_uuid(uuid_status);
1459 
1460 	if (asprintf(refname, "%s-%s", prefix, uuidstr)
1461 	    == -1) {
1462 		err = got_error_from_errno("asprintf");
1463 		*refname = NULL;
1464 	}
1465 	free(uuidstr);
1466 	return err;
1467 }
1468 
1469 const struct got_error *
1470 got_worktree_get_base_ref_name(char **refname, struct got_worktree *worktree)
1471 {
1472 	return get_ref_name(refname, worktree, GOT_WORKTREE_BASE_REF_PREFIX);
1473 }
1474 
1475 static const struct got_error *
1476 get_rebase_tmp_ref_name(char **refname, struct got_worktree *worktree)
1477 {
1478 	return get_ref_name(refname, worktree,
1479 	    GOT_WORKTREE_REBASE_TMP_REF_PREFIX);
1480 }
1481 
1482 static const struct got_error *
1483 get_newbase_symref_name(char **refname, struct got_worktree *worktree)
1484 {
1485 	return get_ref_name(refname, worktree, GOT_WORKTREE_NEWBASE_REF_PREFIX);
1486 }
1487 
1488 static const struct got_error *
1489 get_rebase_branch_symref_name(char **refname, struct got_worktree *worktree)
1490 {
1491 	return get_ref_name(refname, worktree,
1492 	    GOT_WORKTREE_REBASE_BRANCH_REF_PREFIX);
1493 }
1494 
1495 static const struct got_error *
1496 get_rebase_commit_ref_name(char **refname, struct got_worktree *worktree)
1497 {
1498 	return get_ref_name(refname, worktree,
1499 	    GOT_WORKTREE_REBASE_COMMIT_REF_PREFIX);
1500 }
1501 
1502 static const struct got_error *
1503 get_histedit_tmp_ref_name(char **refname, struct got_worktree *worktree)
1504 {
1505 	return get_ref_name(refname, worktree,
1506 	    GOT_WORKTREE_HISTEDIT_TMP_REF_PREFIX);
1507 }
1508 
1509 static const struct got_error *
1510 get_histedit_branch_symref_name(char **refname, struct got_worktree *worktree)
1511 {
1512 	return get_ref_name(refname, worktree,
1513 	    GOT_WORKTREE_HISTEDIT_BRANCH_REF_PREFIX);
1514 }
1515 
1516 static const struct got_error *
1517 get_histedit_base_commit_ref_name(char **refname, struct got_worktree *worktree)
1518 {
1519 	return get_ref_name(refname, worktree,
1520 	    GOT_WORKTREE_HISTEDIT_BASE_COMMIT_REF_PREFIX);
1521 }
1522 
1523 static const struct got_error *
1524 get_histedit_commit_ref_name(char **refname, struct got_worktree *worktree)
1525 {
1526 	return get_ref_name(refname, worktree,
1527 	    GOT_WORKTREE_HISTEDIT_COMMIT_REF_PREFIX);
1528 }
1529 
1530 const struct got_error *
1531 got_worktree_get_histedit_script_path(char **path,
1532     struct got_worktree *worktree)
1533 {
1534 	if (asprintf(path, "%s/%s/%s", worktree->root_path,
1535 	    GOT_WORKTREE_GOT_DIR, GOT_WORKTREE_HISTEDIT_SCRIPT) == -1) {
1536 		*path = NULL;
1537 		return got_error_from_errno("asprintf");
1538 	}
1539 	return NULL;
1540 }
1541 
1542 /*
1543  * Prevent Git's garbage collector from deleting our base commit by
1544  * setting a reference to our base commit's ID.
1545  */
1546 static const struct got_error *
1547 ref_base_commit(struct got_worktree *worktree, struct got_repository *repo)
1548 {
1549 	const struct got_error *err = NULL;
1550 	struct got_reference *ref = NULL;
1551 	char *refname;
1552 
1553 	err = got_worktree_get_base_ref_name(&refname, worktree);
1554 	if (err)
1555 		return err;
1556 
1557 	err = got_ref_alloc(&ref, refname, worktree->base_commit_id);
1558 	if (err)
1559 		goto done;
1560 
1561 	err = got_ref_write(ref, repo);
1562 done:
1563 	free(refname);
1564 	if (ref)
1565 		got_ref_close(ref);
1566 	return err;
1567 }
1568 
1569 static const struct got_error *
1570 get_fileindex_path(char **fileindex_path, struct got_worktree *worktree)
1571 {
1572 	const struct got_error *err = NULL;
1573 
1574 	if (asprintf(fileindex_path, "%s/%s/%s", worktree->root_path,
1575 	    GOT_WORKTREE_GOT_DIR, GOT_WORKTREE_FILE_INDEX) == -1) {
1576 		err = got_error_from_errno("asprintf");
1577 		*fileindex_path = NULL;
1578 	}
1579 	return err;
1580 }
1581 
1582 
1583 static const struct got_error *
1584 open_fileindex(struct got_fileindex **fileindex, char **fileindex_path,
1585    struct got_worktree *worktree)
1586 {
1587 	const struct got_error *err = NULL;
1588 	FILE *index = NULL;
1589 
1590 	*fileindex_path = NULL;
1591 	*fileindex = got_fileindex_alloc();
1592 	if (*fileindex == NULL)
1593 		return got_error_from_errno("got_fileindex_alloc");
1594 
1595 	err = get_fileindex_path(fileindex_path, worktree);
1596 	if (err)
1597 		goto done;
1598 
1599 	index = fopen(*fileindex_path, "rb");
1600 	if (index == NULL) {
1601 		if (errno != ENOENT)
1602 			err = got_error_from_errno2("fopen", *fileindex_path);
1603 	} else {
1604 		err = got_fileindex_read(*fileindex, index);
1605 		if (fclose(index) != 0 && err == NULL)
1606 			err = got_error_from_errno("fclose");
1607 	}
1608 done:
1609 	if (err) {
1610 		free(*fileindex_path);
1611 		*fileindex_path = NULL;
1612 		got_fileindex_free(*fileindex);
1613 		*fileindex = NULL;
1614 	}
1615 	return err;
1616 }
1617 
1618 struct bump_base_commit_id_arg {
1619 	struct got_object_id *base_commit_id;
1620 	const char *path;
1621 	size_t path_len;
1622 	const char *entry_name;
1623 	got_worktree_checkout_cb progress_cb;
1624 	void *progress_arg;
1625 };
1626 
1627 /* Bump base commit ID of all files within an updated part of the work tree. */
1628 static const struct got_error *
1629 bump_base_commit_id(void *arg, struct got_fileindex_entry *ie)
1630 {
1631 	const struct got_error *err;
1632 	struct bump_base_commit_id_arg *a = arg;
1633 
1634 	if (a->entry_name) {
1635 		if (strcmp(ie->path, a->path) != 0)
1636 			return NULL;
1637 	} else if (!got_path_is_child(ie->path, a->path, a->path_len))
1638 		return NULL;
1639 
1640 	if (memcmp(ie->commit_sha1, a->base_commit_id->sha1,
1641 	    SHA1_DIGEST_LENGTH) == 0)
1642 		return NULL;
1643 
1644 	if (a->progress_cb) {
1645 		err = (*a->progress_cb)(a->progress_arg, GOT_STATUS_BUMP_BASE,
1646 		    ie->path);
1647 		if (err)
1648 			return err;
1649 	}
1650 	memcpy(ie->commit_sha1, a->base_commit_id->sha1, SHA1_DIGEST_LENGTH);
1651 	return NULL;
1652 }
1653 
1654 static const struct got_error *
1655 sync_fileindex(struct got_fileindex *fileindex, const char *fileindex_path)
1656 {
1657 	const struct got_error *err = NULL;
1658 	char *new_fileindex_path = NULL;
1659 	FILE *new_index = NULL;
1660 
1661 	err = got_opentemp_named(&new_fileindex_path, &new_index,
1662 	    fileindex_path);
1663 	if (err)
1664 		goto done;
1665 
1666 	err = got_fileindex_write(fileindex, new_index);
1667 	if (err)
1668 		goto done;
1669 
1670 	if (rename(new_fileindex_path, fileindex_path) != 0) {
1671 		err = got_error_from_errno3("rename", new_fileindex_path,
1672 		    fileindex_path);
1673 		unlink(new_fileindex_path);
1674 	}
1675 done:
1676 	if (new_index)
1677 		fclose(new_index);
1678 	free(new_fileindex_path);
1679 	return err;
1680 }
1681 
1682 static const struct got_error *
1683 find_tree_entry_for_checkout(int *entry_type, char **tree_relpath,
1684     struct got_object_id **tree_id, const char *wt_relpath,
1685     struct got_worktree *worktree, struct got_repository *repo)
1686 {
1687 	const struct got_error *err = NULL;
1688 	struct got_object_id *id = NULL;
1689 	char *in_repo_path = NULL;
1690 	int is_root_wt = got_path_is_root_dir(worktree->path_prefix);
1691 
1692 	*entry_type = GOT_OBJ_TYPE_ANY;
1693 	*tree_relpath = NULL;
1694 	*tree_id = NULL;
1695 
1696 	if (wt_relpath[0] == '\0') {
1697 		/* Check out all files within the work tree. */
1698 		*entry_type = GOT_OBJ_TYPE_TREE;
1699 		*tree_relpath = strdup("");
1700 		if (*tree_relpath == NULL) {
1701 			err = got_error_from_errno("strdup");
1702 			goto done;
1703 		}
1704 		err = got_object_id_by_path(tree_id, repo,
1705 		    worktree->base_commit_id, worktree->path_prefix);
1706 		if (err)
1707 			goto done;
1708 		return NULL;
1709 	}
1710 
1711 	/* Check out a subset of files in the work tree. */
1712 
1713 	if (asprintf(&in_repo_path, "%s%s%s", worktree->path_prefix,
1714 	    is_root_wt ? "" : "/", wt_relpath) == -1) {
1715 		err = got_error_from_errno("asprintf");
1716 		goto done;
1717 	}
1718 
1719 	err = got_object_id_by_path(&id, repo, worktree->base_commit_id,
1720 	    in_repo_path);
1721 	if (err)
1722 		goto done;
1723 
1724 	free(in_repo_path);
1725 	in_repo_path = NULL;
1726 
1727 	err = got_object_get_type(entry_type, repo, id);
1728 	if (err)
1729 		goto done;
1730 
1731 	if (*entry_type == GOT_OBJ_TYPE_BLOB) {
1732 		/* Check out a single file. */
1733 		if (strchr(wt_relpath, '/')  == NULL) {
1734 			/* Check out a single file in work tree's root dir. */
1735 			in_repo_path = strdup(worktree->path_prefix);
1736 			if (in_repo_path == NULL) {
1737 				err = got_error_from_errno("strdup");
1738 				goto done;
1739 			}
1740 			*tree_relpath = strdup("");
1741 			if (*tree_relpath == NULL) {
1742 				err = got_error_from_errno("strdup");
1743 				goto done;
1744 			}
1745 		} else {
1746 			/* Check out a single file in a subdirectory. */
1747 			err = got_path_dirname(tree_relpath, wt_relpath);
1748 			if (err)
1749 				return err;
1750 			if (asprintf(&in_repo_path, "%s%s%s",
1751 			    worktree->path_prefix, is_root_wt ? "" : "/",
1752 			    *tree_relpath) == -1) {
1753 				err = got_error_from_errno("asprintf");
1754 				goto done;
1755 			}
1756 		}
1757 		err = got_object_id_by_path(tree_id, repo,
1758 		    worktree->base_commit_id, in_repo_path);
1759 	} else {
1760 		/* Check out all files within a subdirectory. */
1761 		*tree_id = got_object_id_dup(id);
1762 		if (*tree_id == NULL) {
1763 			err = got_error_from_errno("got_object_id_dup");
1764 			goto done;
1765 		}
1766 		*tree_relpath = strdup(wt_relpath);
1767 		if (*tree_relpath == NULL) {
1768 			err = got_error_from_errno("strdup");
1769 			goto done;
1770 		}
1771 	}
1772 done:
1773 	free(id);
1774 	free(in_repo_path);
1775 	if (err) {
1776 		*entry_type = GOT_OBJ_TYPE_ANY;
1777 		free(*tree_relpath);
1778 		*tree_relpath = NULL;
1779 		free(*tree_id);
1780 		*tree_id = NULL;
1781 	}
1782 	return err;
1783 }
1784 
1785 static const struct got_error *
1786 checkout_files(struct got_worktree *worktree, struct got_fileindex *fileindex,
1787     const char *relpath, struct got_object_id *tree_id, const char *entry_name,
1788     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
1789     void *progress_arg, got_cancel_cb cancel_cb, void *cancel_arg)
1790 {
1791 	const struct got_error *err = NULL;
1792 	struct got_commit_object *commit = NULL;
1793 	struct got_tree_object *tree = NULL;
1794 	struct got_fileindex_diff_tree_cb diff_cb;
1795 	struct diff_cb_arg arg;
1796 
1797 	err = ref_base_commit(worktree, repo);
1798 	if (err)
1799 		goto done;
1800 
1801 	err = got_object_open_as_commit(&commit, repo,
1802 	   worktree->base_commit_id);
1803 	if (err)
1804 		goto done;
1805 
1806 	err = got_object_open_as_tree(&tree, repo, tree_id);
1807 	if (err)
1808 		goto done;
1809 
1810 	if (entry_name &&
1811 	    got_object_tree_find_entry(tree, entry_name) == NULL) {
1812 		err = got_error(GOT_ERR_NO_TREE_ENTRY);
1813 		goto done;
1814 	}
1815 
1816 	diff_cb.diff_old_new = diff_old_new;
1817 	diff_cb.diff_old = diff_old;
1818 	diff_cb.diff_new = diff_new;
1819 	arg.fileindex = fileindex;
1820 	arg.worktree = worktree;
1821 	arg.repo = repo;
1822 	arg.progress_cb = progress_cb;
1823 	arg.progress_arg = progress_arg;
1824 	arg.cancel_cb = cancel_cb;
1825 	arg.cancel_arg = cancel_arg;
1826 	err = got_fileindex_diff_tree(fileindex, tree, relpath,
1827 	    entry_name, repo, &diff_cb, &arg);
1828 done:
1829 	if (tree)
1830 		got_object_tree_close(tree);
1831 	if (commit)
1832 		got_object_commit_close(commit);
1833 	return err;
1834 }
1835 
1836 const struct got_error *
1837 got_worktree_checkout_files(struct got_worktree *worktree,
1838     struct got_pathlist_head *paths, struct got_repository *repo,
1839     got_worktree_checkout_cb progress_cb, void *progress_arg,
1840     got_cancel_cb cancel_cb, void *cancel_arg)
1841 {
1842 	const struct got_error *err = NULL, *sync_err, *unlockerr;
1843 	struct got_commit_object *commit = NULL;
1844 	struct got_tree_object *tree = NULL;
1845 	struct got_fileindex *fileindex = NULL;
1846 	char *fileindex_path = NULL;
1847 	struct got_pathlist_entry *pe;
1848 	struct tree_path_data {
1849 		SIMPLEQ_ENTRY(tree_path_data) entry;
1850 		struct got_object_id *tree_id;
1851 		int entry_type;
1852 		char *relpath;
1853 		char *entry_name;
1854 	} *tpd = NULL;
1855 	SIMPLEQ_HEAD(tree_paths, tree_path_data) tree_paths;
1856 
1857 	SIMPLEQ_INIT(&tree_paths);
1858 
1859 	err = lock_worktree(worktree, LOCK_EX);
1860 	if (err)
1861 		return err;
1862 
1863 	/* Map all specified paths to in-repository trees. */
1864 	TAILQ_FOREACH(pe, paths, entry) {
1865 		tpd = malloc(sizeof(*tpd));
1866 		if (tpd == NULL) {
1867 			err = got_error_from_errno("malloc");
1868 			goto done;
1869 		}
1870 
1871 		err = find_tree_entry_for_checkout(&tpd->entry_type,
1872 		    &tpd->relpath, &tpd->tree_id, pe->path, worktree, repo);
1873 		if (err) {
1874 			free(tpd);
1875 			goto done;
1876 		}
1877 
1878 		if (tpd->entry_type == GOT_OBJ_TYPE_BLOB) {
1879 			err = got_path_basename(&tpd->entry_name, pe->path);
1880 			if (err) {
1881 				free(tpd->relpath);
1882 				free(tpd->tree_id);
1883 				free(tpd);
1884 				goto done;
1885 			}
1886 		} else
1887 			tpd->entry_name = NULL;
1888 
1889 		SIMPLEQ_INSERT_TAIL(&tree_paths, tpd, entry);
1890 	}
1891 
1892 	/*
1893 	 * Read the file index.
1894 	 * Checking out files is supposed to be an idempotent operation.
1895 	 * If the on-disk file index is incomplete we will try to complete it.
1896 	 */
1897 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
1898 	if (err)
1899 		goto done;
1900 
1901 	tpd = SIMPLEQ_FIRST(&tree_paths);
1902 	TAILQ_FOREACH(pe, paths, entry) {
1903 		struct bump_base_commit_id_arg bbc_arg;
1904 
1905 		err = checkout_files(worktree, fileindex, tpd->relpath,
1906 		    tpd->tree_id, tpd->entry_name, repo,
1907 		    progress_cb, progress_arg, cancel_cb, cancel_arg);
1908 		if (err)
1909 			break;
1910 
1911 		bbc_arg.base_commit_id = worktree->base_commit_id;
1912 		bbc_arg.entry_name = tpd->entry_name;
1913 		bbc_arg.path = pe->path;
1914 		bbc_arg.path_len = pe->path_len;
1915 		bbc_arg.progress_cb = progress_cb;
1916 		bbc_arg.progress_arg = progress_arg;
1917 		err = got_fileindex_for_each_entry_safe(fileindex,
1918 		    bump_base_commit_id, &bbc_arg);
1919 		if (err)
1920 			break;
1921 
1922 		tpd = SIMPLEQ_NEXT(tpd, entry);
1923 	}
1924 	sync_err = sync_fileindex(fileindex, fileindex_path);
1925 	if (sync_err && err == NULL)
1926 		err = sync_err;
1927 done:
1928 	free(fileindex_path);
1929 	if (tree)
1930 		got_object_tree_close(tree);
1931 	if (commit)
1932 		got_object_commit_close(commit);
1933 	if (fileindex)
1934 		got_fileindex_free(fileindex);
1935 	while (!SIMPLEQ_EMPTY(&tree_paths)) {
1936 		tpd = SIMPLEQ_FIRST(&tree_paths);
1937 		SIMPLEQ_REMOVE_HEAD(&tree_paths, entry);
1938 		free(tpd->relpath);
1939 		free(tpd->tree_id);
1940 		free(tpd);
1941 	}
1942 	unlockerr = lock_worktree(worktree, LOCK_SH);
1943 	if (unlockerr && err == NULL)
1944 		err = unlockerr;
1945 	return err;
1946 }
1947 
1948 struct merge_file_cb_arg {
1949     struct got_worktree *worktree;
1950     struct got_fileindex *fileindex;
1951     got_worktree_checkout_cb progress_cb;
1952     void *progress_arg;
1953     got_cancel_cb cancel_cb;
1954     void *cancel_arg;
1955     struct got_object_id *commit_id2;
1956 };
1957 
1958 static const struct got_error *
1959 merge_file_cb(void *arg, struct got_blob_object *blob1,
1960     struct got_blob_object *blob2, struct got_object_id *id1,
1961     struct got_object_id *id2, const char *path1, const char *path2,
1962     struct got_repository *repo)
1963 {
1964 	static const struct got_error *err = NULL;
1965 	struct merge_file_cb_arg *a = arg;
1966 	struct got_fileindex_entry *ie;
1967 	char *ondisk_path = NULL;
1968 	struct stat sb;
1969 	unsigned char status;
1970 	int local_changes_subsumed;
1971 
1972 	if (blob1 && blob2) {
1973 		ie = got_fileindex_entry_get(a->fileindex, path2,
1974 		    strlen(path2));
1975 		if (ie == NULL)
1976 			return (*a->progress_cb)(a->progress_arg,
1977 			    GOT_STATUS_MISSING, path2);
1978 
1979 		if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
1980 		    path2) == -1)
1981 			return got_error_from_errno("asprintf");
1982 
1983 		err = get_file_status(&status, &sb, ie, ondisk_path, repo);
1984 		if (err)
1985 			goto done;
1986 
1987 		if (status == GOT_STATUS_DELETE) {
1988 			err = (*a->progress_cb)(a->progress_arg,
1989 			    GOT_STATUS_MERGE, path2);
1990 			goto done;
1991 		}
1992 		if (status != GOT_STATUS_NO_CHANGE &&
1993 		    status != GOT_STATUS_MODIFY &&
1994 		    status != GOT_STATUS_CONFLICT &&
1995 		    status != GOT_STATUS_ADD) {
1996 			err = (*a->progress_cb)(a->progress_arg, status, path2);
1997 			goto done;
1998 		}
1999 
2000 		err = merge_blob(&local_changes_subsumed, a->worktree, blob1,
2001 		    ondisk_path, path2, sb.st_mode, blob2, a->commit_id2, repo,
2002 		    a->progress_cb, a->progress_arg);
2003 	} else if (blob1) {
2004 		ie = got_fileindex_entry_get(a->fileindex, path1,
2005 		    strlen(path1));
2006 		if (ie == NULL)
2007 			return (*a->progress_cb)(a->progress_arg,
2008 			    GOT_STATUS_MISSING, path2);
2009 
2010 		if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
2011 		    path1) == -1)
2012 			return got_error_from_errno("asprintf");
2013 
2014 		err = get_file_status(&status, &sb, ie, ondisk_path, repo);
2015 		if (err)
2016 			goto done;
2017 
2018 		switch (status) {
2019 		case GOT_STATUS_NO_CHANGE:
2020 			err = (*a->progress_cb)(a->progress_arg,
2021 			    GOT_STATUS_DELETE, path1);
2022 			if (err)
2023 				goto done;
2024 			err = remove_ondisk_file(a->worktree->root_path, path1);
2025 			if (err)
2026 				goto done;
2027 			if (ie)
2028 				got_fileindex_entry_mark_deleted_from_disk(ie);
2029 			break;
2030 		case GOT_STATUS_DELETE:
2031 		case GOT_STATUS_MISSING:
2032 			err = (*a->progress_cb)(a->progress_arg,
2033 			    GOT_STATUS_DELETE, path1);
2034 			if (err)
2035 				goto done;
2036 			if (ie)
2037 				got_fileindex_entry_mark_deleted_from_disk(ie);
2038 			break;
2039 		case GOT_STATUS_ADD:
2040 		case GOT_STATUS_MODIFY:
2041 		case GOT_STATUS_CONFLICT:
2042 			err = (*a->progress_cb)(a->progress_arg,
2043 			    GOT_STATUS_CANNOT_DELETE, path1);
2044 			if (err)
2045 				goto done;
2046 			break;
2047 		case GOT_STATUS_OBSTRUCTED:
2048 			err = (*a->progress_cb)(a->progress_arg, status, path1);
2049 			if (err)
2050 				goto done;
2051 			break;
2052 		default:
2053 			break;
2054 		}
2055 	} else if (blob2) {
2056 		if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
2057 		    path2) == -1)
2058 			return got_error_from_errno("asprintf");
2059 		ie = got_fileindex_entry_get(a->fileindex, path2,
2060 		    strlen(path2));
2061 		if (ie) {
2062 			err = get_file_status(&status, &sb, ie, ondisk_path,
2063 			    repo);
2064 			if (err)
2065 				goto done;
2066 			if (status != GOT_STATUS_NO_CHANGE &&
2067 			    status != GOT_STATUS_MODIFY &&
2068 			    status != GOT_STATUS_CONFLICT &&
2069 			    status != GOT_STATUS_ADD) {
2070 				err = (*a->progress_cb)(a->progress_arg,
2071 				    status, path2);
2072 				goto done;
2073 			}
2074 			err = merge_blob(&local_changes_subsumed, a->worktree,
2075 			    NULL, ondisk_path, path2, sb.st_mode, blob2,
2076 			    a->commit_id2, repo,
2077 			    a->progress_cb, a->progress_arg);
2078 			if (status == GOT_STATUS_DELETE) {
2079 				err = update_blob_fileindex_entry(a->worktree,
2080 				    a->fileindex, ie, ondisk_path, ie->path,
2081 				    blob2, 0);
2082 				if (err)
2083 					goto done;
2084 			}
2085 		} else {
2086 			sb.st_mode = GOT_DEFAULT_FILE_MODE;
2087 			err = install_blob(a->worktree, ondisk_path, path2,
2088 			    /* XXX get this from parent tree! */
2089 			    GOT_DEFAULT_FILE_MODE,
2090 			    sb.st_mode, blob2, 0, 0, repo,
2091 			    a->progress_cb, a->progress_arg);
2092 			if (err)
2093 				goto done;
2094 			err = got_fileindex_entry_alloc(&ie,
2095 			    ondisk_path, path2, NULL, NULL);
2096 			if (err)
2097 				goto done;
2098 			err = got_fileindex_entry_add(a->fileindex, ie);
2099 			if (err) {
2100 				got_fileindex_entry_free(ie);
2101 				goto done;
2102 			}
2103 		}
2104 	}
2105 done:
2106 	free(ondisk_path);
2107 	return err;
2108 }
2109 
2110 struct check_merge_ok_arg {
2111 	struct got_worktree *worktree;
2112 	struct got_repository *repo;
2113 };
2114 
2115 static const struct got_error *
2116 check_merge_ok(void *arg, struct got_fileindex_entry *ie)
2117 {
2118 	const struct got_error *err = NULL;
2119 	struct check_merge_ok_arg *a = arg;
2120 	unsigned char status;
2121 	struct stat sb;
2122 	char *ondisk_path;
2123 
2124 	/* Reject merges into a work tree with mixed base commits. */
2125 	if (memcmp(ie->commit_sha1, a->worktree->base_commit_id->sha1,
2126 	    SHA1_DIGEST_LENGTH))
2127 		return got_error(GOT_ERR_MIXED_COMMITS);
2128 
2129 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path, ie->path)
2130 	    == -1)
2131 		return got_error_from_errno("asprintf");
2132 
2133 	/* Reject merges into a work tree with conflicted files. */
2134 	err = get_file_status(&status, &sb, ie, ondisk_path, a->repo);
2135 	if (err)
2136 		return err;
2137 	if (status == GOT_STATUS_CONFLICT)
2138 		return got_error(GOT_ERR_CONFLICTS);
2139 
2140 	return NULL;
2141 }
2142 
2143 static const struct got_error *
2144 merge_files(struct got_worktree *worktree, struct got_fileindex *fileindex,
2145     const char *fileindex_path, struct got_object_id *commit_id1,
2146     struct got_object_id *commit_id2, struct got_repository *repo,
2147     got_worktree_checkout_cb progress_cb, void *progress_arg,
2148     got_cancel_cb cancel_cb, void *cancel_arg)
2149 {
2150 	const struct got_error *err = NULL, *sync_err;
2151 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
2152 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
2153 	struct merge_file_cb_arg arg;
2154 
2155 	if (commit_id1) {
2156 		err = got_object_id_by_path(&tree_id1, repo, commit_id1,
2157 		    worktree->path_prefix);
2158 		if (err)
2159 			goto done;
2160 
2161 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
2162 		if (err)
2163 			goto done;
2164 	}
2165 
2166 	err = got_object_id_by_path(&tree_id2, repo, commit_id2,
2167 	    worktree->path_prefix);
2168 	if (err)
2169 		goto done;
2170 
2171 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
2172 	if (err)
2173 		goto done;
2174 
2175 	arg.worktree = worktree;
2176 	arg.fileindex = fileindex;
2177 	arg.progress_cb = progress_cb;
2178 	arg.progress_arg = progress_arg;
2179 	arg.cancel_cb = cancel_cb;
2180 	arg.cancel_arg = cancel_arg;
2181 	arg.commit_id2 = commit_id2;
2182 	err = got_diff_tree(tree1, tree2, "", "", repo, merge_file_cb, &arg, 1);
2183 	sync_err = sync_fileindex(fileindex, fileindex_path);
2184 	if (sync_err && err == NULL)
2185 		err = sync_err;
2186 done:
2187 	if (tree1)
2188 		got_object_tree_close(tree1);
2189 	if (tree2)
2190 		got_object_tree_close(tree2);
2191 	return err;
2192 }
2193 
2194 const struct got_error *
2195 got_worktree_merge_files(struct got_worktree *worktree,
2196     struct got_object_id *commit_id1, struct got_object_id *commit_id2,
2197     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
2198     void *progress_arg, got_cancel_cb cancel_cb, void *cancel_arg)
2199 {
2200 	const struct got_error *err, *unlockerr;
2201 	char *fileindex_path = NULL;
2202 	struct got_fileindex *fileindex = NULL;
2203 	struct check_merge_ok_arg mok_arg;
2204 
2205 	err = lock_worktree(worktree, LOCK_EX);
2206 	if (err)
2207 		return err;
2208 
2209 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
2210 	if (err)
2211 		goto done;
2212 
2213 	mok_arg.worktree = worktree;
2214 	mok_arg.repo = repo;
2215 	err = got_fileindex_for_each_entry_safe(fileindex, check_merge_ok,
2216 	    &mok_arg);
2217 	if (err)
2218 		goto done;
2219 
2220 	err = merge_files(worktree, fileindex, fileindex_path, commit_id1,
2221 	    commit_id2, repo, progress_cb, progress_arg, cancel_cb, cancel_arg);
2222 done:
2223 	if (fileindex)
2224 		got_fileindex_free(fileindex);
2225 	free(fileindex_path);
2226 	unlockerr = lock_worktree(worktree, LOCK_SH);
2227 	if (unlockerr && err == NULL)
2228 		err = unlockerr;
2229 	return err;
2230 }
2231 
2232 struct diff_dir_cb_arg {
2233     struct got_fileindex *fileindex;
2234     struct got_worktree *worktree;
2235     const char *status_path;
2236     size_t status_path_len;
2237     struct got_repository *repo;
2238     got_worktree_status_cb status_cb;
2239     void *status_arg;
2240     got_cancel_cb cancel_cb;
2241     void *cancel_arg;
2242     /* A pathlist containing per-directory pathlists of ignore patterns. */
2243     struct got_pathlist_head ignores;
2244 };
2245 
2246 static const struct got_error *
2247 report_file_status(struct got_fileindex_entry *ie, const char *abspath,
2248     got_worktree_status_cb status_cb, void *status_arg,
2249     struct got_repository *repo)
2250 {
2251 	const struct got_error *err = NULL;
2252 	unsigned char status = GOT_STATUS_NO_CHANGE;
2253 	unsigned char staged_status = get_staged_status(ie);
2254 	struct stat sb;
2255 	struct got_object_id blob_id, commit_id, staged_blob_id;
2256 	struct got_object_id *blob_idp = NULL, *commit_idp = NULL;
2257 	struct got_object_id *staged_blob_idp = NULL;
2258 
2259 	err = get_file_status(&status, &sb, ie, abspath, repo);
2260 	if (err)
2261 		return err;
2262 
2263 	if (status == GOT_STATUS_NO_CHANGE &&
2264 	    staged_status == GOT_STATUS_NO_CHANGE)
2265 		return NULL;
2266 
2267 	if (got_fileindex_entry_has_blob(ie)) {
2268 		memcpy(blob_id.sha1, ie->blob_sha1, SHA1_DIGEST_LENGTH);
2269 		blob_idp = &blob_id;
2270 	}
2271 	if (got_fileindex_entry_has_commit(ie)) {
2272 		memcpy(commit_id.sha1, ie->commit_sha1, SHA1_DIGEST_LENGTH);
2273 		commit_idp = &commit_id;
2274 	}
2275 	if (staged_status == GOT_STATUS_ADD ||
2276 	    staged_status == GOT_STATUS_MODIFY) {
2277 		memcpy(staged_blob_id.sha1, ie->staged_blob_sha1,
2278 		    SHA1_DIGEST_LENGTH);
2279 		staged_blob_idp = &staged_blob_id;
2280 	}
2281 
2282 	return (*status_cb)(status_arg, status, staged_status,
2283 	    ie->path, blob_idp, staged_blob_idp, commit_idp);
2284 }
2285 
2286 static const struct got_error *
2287 status_old_new(void *arg, struct got_fileindex_entry *ie,
2288     struct dirent *de, const char *parent_path)
2289 {
2290 	const struct got_error *err = NULL;
2291 	struct diff_dir_cb_arg *a = arg;
2292 	char *abspath;
2293 
2294 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
2295 		return got_error(GOT_ERR_CANCELLED);
2296 
2297 	if (got_path_cmp(parent_path, a->status_path,
2298 	    strlen(parent_path), a->status_path_len) != 0 &&
2299 	    !got_path_is_child(parent_path, a->status_path, a->status_path_len))
2300 		return NULL;
2301 
2302 	if (parent_path[0]) {
2303 		if (asprintf(&abspath, "%s/%s/%s", a->worktree->root_path,
2304 		    parent_path, de->d_name) == -1)
2305 			return got_error_from_errno("asprintf");
2306 	} else {
2307 		if (asprintf(&abspath, "%s/%s", a->worktree->root_path,
2308 		    de->d_name) == -1)
2309 			return got_error_from_errno("asprintf");
2310 	}
2311 
2312 	err = report_file_status(ie, abspath, a->status_cb, a->status_arg,
2313 	    a->repo);
2314 	free(abspath);
2315 	return err;
2316 }
2317 
2318 static const struct got_error *
2319 status_old(void *arg, struct got_fileindex_entry *ie, const char *parent_path)
2320 {
2321 	struct diff_dir_cb_arg *a = arg;
2322 	struct got_object_id blob_id, commit_id;
2323 	unsigned char status;
2324 
2325 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
2326 		return got_error(GOT_ERR_CANCELLED);
2327 
2328 	if (!got_path_is_child(ie->path, a->status_path, a->status_path_len))
2329 		return NULL;
2330 
2331 	memcpy(blob_id.sha1, ie->blob_sha1, SHA1_DIGEST_LENGTH);
2332 	memcpy(commit_id.sha1, ie->commit_sha1, SHA1_DIGEST_LENGTH);
2333 	if (got_fileindex_entry_has_file_on_disk(ie))
2334 		status = GOT_STATUS_MISSING;
2335 	else
2336 		status = GOT_STATUS_DELETE;
2337 	return (*a->status_cb)(a->status_arg, status, get_staged_status(ie),
2338 	    ie->path, &blob_id, NULL, &commit_id);
2339 }
2340 
2341 void
2342 free_ignorelist(struct got_pathlist_head *ignorelist)
2343 {
2344 	struct got_pathlist_entry *pe;
2345 
2346 	TAILQ_FOREACH(pe, ignorelist, entry)
2347 		free((char *)pe->path);
2348 	got_pathlist_free(ignorelist);
2349 }
2350 
2351 void
2352 free_ignores(struct got_pathlist_head *ignores)
2353 {
2354 	struct got_pathlist_entry *pe;
2355 
2356 	TAILQ_FOREACH(pe, ignores, entry) {
2357 		struct got_pathlist_head *ignorelist = pe->data;
2358 		free_ignorelist(ignorelist);
2359 		free((char *)pe->path);
2360 	}
2361 	got_pathlist_free(ignores);
2362 }
2363 
2364 static const struct got_error *
2365 read_ignores(struct got_pathlist_head *ignores, const char *path, FILE *f)
2366 {
2367 	const struct got_error *err = NULL;
2368 	struct got_pathlist_entry *pe = NULL;
2369 	struct got_pathlist_head *ignorelist;
2370 	char *line = NULL, *pattern, *dirpath = NULL;
2371 	size_t linesize = 0;
2372 	ssize_t linelen;
2373 
2374 	ignorelist = calloc(1, sizeof(*ignorelist));
2375 	if (ignorelist == NULL)
2376 		return got_error_from_errno("calloc");
2377 	TAILQ_INIT(ignorelist);
2378 
2379 	while ((linelen = getline(&line, &linesize, f)) != -1) {
2380 		if (linelen > 0 && line[linelen - 1] == '\n')
2381 			line[linelen - 1] = '\0';
2382 		if (asprintf(&pattern, "%s%s%s", path, path[0] ? "/" : "",
2383 		    line) == -1) {
2384 			err = got_error_from_errno("asprintf");
2385 			goto done;
2386 		}
2387 		err = got_pathlist_insert(NULL, ignorelist, pattern, NULL);
2388 		if (err)
2389 			goto done;
2390 	}
2391 	if (ferror(f)) {
2392 		err = got_error_from_errno("getline");
2393 		goto done;
2394 	}
2395 
2396 	dirpath = strdup(path);
2397 	if (dirpath == NULL) {
2398 		err = got_error_from_errno("strdup");
2399 		goto done;
2400 	}
2401 	err = got_pathlist_insert(&pe, ignores, dirpath, ignorelist);
2402 done:
2403 	free(line);
2404 	if (err || pe == NULL) {
2405 		free(dirpath);
2406 		free_ignorelist(ignorelist);
2407 	}
2408 	return err;
2409 }
2410 
2411 int
2412 match_ignores(struct got_pathlist_head *ignores, const char *path)
2413 {
2414 	struct got_pathlist_entry *pe;
2415 
2416 	/*
2417 	 * The ignores pathlist contains ignore lists from children before
2418 	 * parents, so we can find the most specific ignorelist by walking
2419 	 * ignores backwards.
2420 	 */
2421 	pe = TAILQ_LAST(ignores, got_pathlist_head);
2422 	while (pe) {
2423 		if (got_path_is_child(path, pe->path, pe->path_len)) {
2424 			struct got_pathlist_head *ignorelist = pe->data;
2425 			struct got_pathlist_entry *pi;
2426 			TAILQ_FOREACH(pi, ignorelist, entry) {
2427 				if (fnmatch(pi->path, path,
2428 				    FNM_PATHNAME | FNM_LEADING_DIR))
2429 					continue;
2430 				return 1;
2431 			}
2432 		}
2433 		pe = TAILQ_PREV(pe, got_pathlist_head, entry);
2434 	}
2435 
2436 	return 0;
2437 }
2438 
2439 static const struct got_error *
2440 add_ignores(struct got_pathlist_head *ignores, const char *root_path,
2441     const char *path)
2442 {
2443 	const struct got_error *err = NULL;
2444 	char *ignorespath;
2445 	FILE *ignoresfile = NULL;
2446 
2447 	/* TODO: read .gitignores as well... */
2448 	if (asprintf(&ignorespath, "%s/%s%s.cvsignore", root_path, path,
2449 	    path[0] ? "/" : "") == -1)
2450 		return got_error_from_errno("asprintf");
2451 
2452 	ignoresfile = fopen(ignorespath, "r");
2453 	if (ignoresfile == NULL) {
2454 		if (errno != ENOENT)
2455 			err = got_error_from_errno2("fopen",
2456 			    ignorespath);
2457 	} else
2458 		err = read_ignores(ignores, path, ignoresfile);
2459 
2460 	if (ignoresfile && fclose(ignoresfile) == EOF && err == NULL)
2461 		err = got_error_from_errno2("flose", path);
2462 	free(ignorespath);
2463 	return err;
2464 }
2465 
2466 static const struct got_error *
2467 status_new(void *arg, struct dirent *de, const char *parent_path)
2468 {
2469 	const struct got_error *err = NULL;
2470 	struct diff_dir_cb_arg *a = arg;
2471 	char *path = NULL;
2472 
2473 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
2474 		return got_error(GOT_ERR_CANCELLED);
2475 
2476 	/* XXX ignore symlinks for now */
2477 	if (de->d_type == DT_LNK)
2478 		return NULL;
2479 
2480 	if (parent_path[0]) {
2481 		if (asprintf(&path, "%s/%s", parent_path, de->d_name) == -1)
2482 			return got_error_from_errno("asprintf");
2483 	} else {
2484 		path = de->d_name;
2485 	}
2486 
2487 	if (de->d_type == DT_DIR)
2488 		err = add_ignores(&a->ignores, a->worktree->root_path, path);
2489 	else if (got_path_is_child(path, a->status_path, a->status_path_len)
2490 	    && !match_ignores(&a->ignores, path))
2491 		err = (*a->status_cb)(a->status_arg, GOT_STATUS_UNVERSIONED,
2492 		    GOT_STATUS_NO_CHANGE, path, NULL, NULL, NULL);
2493 	if (parent_path[0])
2494 		free(path);
2495 	return err;
2496 }
2497 
2498 static const struct got_error *
2499 report_single_file_status(const char *path, const char *ondisk_path,
2500 struct got_fileindex *fileindex, got_worktree_status_cb status_cb,
2501 void *status_arg, struct got_repository *repo)
2502 {
2503 	struct got_fileindex_entry *ie;
2504 	struct stat sb;
2505 
2506 	ie = got_fileindex_entry_get(fileindex, path, strlen(path));
2507 	if (ie)
2508 		return report_file_status(ie, ondisk_path, status_cb,
2509 		    status_arg, repo);
2510 
2511 	if (lstat(ondisk_path, &sb) == -1) {
2512 		if (errno != ENOENT)
2513 			return got_error_from_errno2("lstat", ondisk_path);
2514 		return (*status_cb)(status_arg, GOT_STATUS_NONEXISTENT,
2515 		    GOT_STATUS_NO_CHANGE, path, NULL, NULL, NULL);
2516 		return NULL;
2517 	}
2518 
2519 	if (S_ISREG(sb.st_mode))
2520 		return (*status_cb)(status_arg, GOT_STATUS_UNVERSIONED,
2521 		    GOT_STATUS_NO_CHANGE, path, NULL, NULL, NULL);
2522 
2523 	return NULL;
2524 }
2525 
2526 static const struct got_error *
2527 worktree_status(struct got_worktree *worktree, const char *path,
2528     struct got_fileindex *fileindex, struct got_repository *repo,
2529     got_worktree_status_cb status_cb, void *status_arg,
2530     got_cancel_cb cancel_cb, void *cancel_arg)
2531 {
2532 	const struct got_error *err = NULL;
2533 	DIR *workdir = NULL;
2534 	struct got_fileindex_diff_dir_cb fdiff_cb;
2535 	struct diff_dir_cb_arg arg;
2536 	char *ondisk_path = NULL;
2537 
2538 	if (asprintf(&ondisk_path, "%s%s%s",
2539 	    worktree->root_path, path[0] ? "/" : "", path) == -1)
2540 		return got_error_from_errno("asprintf");
2541 
2542 	workdir = opendir(ondisk_path);
2543 	if (workdir == NULL) {
2544 		if (errno != ENOTDIR && errno != ENOENT)
2545 			err = got_error_from_errno2("opendir", ondisk_path);
2546 		else
2547 			err = report_single_file_status(path, ondisk_path,
2548 			    fileindex, status_cb, status_arg, repo);
2549 	} else {
2550 		fdiff_cb.diff_old_new = status_old_new;
2551 		fdiff_cb.diff_old = status_old;
2552 		fdiff_cb.diff_new = status_new;
2553 		arg.fileindex = fileindex;
2554 		arg.worktree = worktree;
2555 		arg.status_path = path;
2556 		arg.status_path_len = strlen(path);
2557 		arg.repo = repo;
2558 		arg.status_cb = status_cb;
2559 		arg.status_arg = status_arg;
2560 		arg.cancel_cb = cancel_cb;
2561 		arg.cancel_arg = cancel_arg;
2562 		TAILQ_INIT(&arg.ignores);
2563 		err = add_ignores(&arg.ignores, worktree->root_path, path);
2564 		if (err == NULL)
2565 			err = got_fileindex_diff_dir(fileindex, workdir,
2566 			    worktree->root_path, path, repo, &fdiff_cb, &arg);
2567 		free_ignores(&arg.ignores);
2568 	}
2569 
2570 	if (workdir)
2571 		closedir(workdir);
2572 	free(ondisk_path);
2573 	return err;
2574 }
2575 
2576 const struct got_error *
2577 got_worktree_status(struct got_worktree *worktree,
2578     struct got_pathlist_head *paths, struct got_repository *repo,
2579     got_worktree_status_cb status_cb, void *status_arg,
2580     got_cancel_cb cancel_cb, void *cancel_arg)
2581 {
2582 	const struct got_error *err = NULL;
2583 	char *fileindex_path = NULL;
2584 	struct got_fileindex *fileindex = NULL;
2585 	struct got_pathlist_entry *pe;
2586 
2587 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
2588 	if (err)
2589 		return err;
2590 
2591 	TAILQ_FOREACH(pe, paths, entry) {
2592 		err = worktree_status(worktree, pe->path, fileindex, repo,
2593 			status_cb, status_arg, cancel_cb, cancel_arg);
2594 		if (err)
2595 			break;
2596 	}
2597 	free(fileindex_path);
2598 	got_fileindex_free(fileindex);
2599 	return err;
2600 }
2601 
2602 const struct got_error *
2603 got_worktree_resolve_path(char **wt_path, struct got_worktree *worktree,
2604     const char *arg)
2605 {
2606 	const struct got_error *err = NULL;
2607 	char *resolved, *cwd = NULL, *path = NULL;
2608 	size_t len;
2609 
2610 	*wt_path = NULL;
2611 
2612 	resolved = realpath(arg, NULL);
2613 	if (resolved == NULL) {
2614 		if (errno != ENOENT)
2615 			return got_error_from_errno2("realpath", arg);
2616 		cwd = getcwd(NULL, 0);
2617 		if (cwd == NULL)
2618 			return got_error_from_errno("getcwd");
2619 		if (asprintf(&resolved, "%s/%s", cwd, arg) == -1) {
2620 			err = got_error_from_errno("asprintf");
2621 			goto done;
2622 		}
2623 	}
2624 
2625 	if (strncmp(got_worktree_get_root_path(worktree), resolved,
2626 	    strlen(got_worktree_get_root_path(worktree)))) {
2627 		err = got_error(GOT_ERR_BAD_PATH);
2628 		goto done;
2629 	}
2630 
2631 	if (strlen(resolved) > strlen(got_worktree_get_root_path(worktree))) {
2632 		err = got_path_skip_common_ancestor(&path,
2633 		    got_worktree_get_root_path(worktree), resolved);
2634 		if (err)
2635 			goto done;
2636 	} else {
2637 		path = strdup("");
2638 		if (path == NULL) {
2639 			err = got_error_from_errno("strdup");
2640 			goto done;
2641 		}
2642 	}
2643 
2644 	/* XXX status walk can't deal with trailing slash! */
2645 	len = strlen(path);
2646 	while (len > 0 && path[len - 1] == '/') {
2647 		path[len - 1] = '\0';
2648 		len--;
2649 	}
2650 done:
2651 	free(resolved);
2652 	free(cwd);
2653 	if (err == NULL)
2654 		*wt_path = path;
2655 	else
2656 		free(path);
2657 	return err;
2658 }
2659 
2660 static const struct got_error *
2661 schedule_addition(const char *ondisk_path, struct got_fileindex *fileindex,
2662     const char *relpath, got_worktree_status_cb status_cb, void *status_arg,
2663     struct got_repository *repo)
2664 {
2665 	const struct got_error *err = NULL;
2666 	struct got_fileindex_entry *ie;
2667 	unsigned char status;
2668 	struct stat sb;
2669 
2670 	ie = got_fileindex_entry_get(fileindex, relpath, strlen(relpath));
2671 	if (ie) {
2672 		err = get_file_status(&status, &sb, ie, ondisk_path, repo);
2673 		if (err)
2674 			return err;
2675 		/* Re-adding an existing entry is a no-op. */
2676 		if (status == GOT_STATUS_ADD)
2677 			return NULL;
2678 		return got_error_path(relpath, GOT_ERR_FILE_STATUS);
2679 	}
2680 
2681 	err = got_fileindex_entry_alloc(&ie, ondisk_path, relpath, NULL, NULL);
2682 	if (err)
2683 		return err;
2684 
2685 	err = got_fileindex_entry_add(fileindex, ie);
2686 	if (err) {
2687 		got_fileindex_entry_free(ie);
2688 		return err;
2689 	}
2690 
2691 	return report_file_status(ie, ondisk_path, status_cb, status_arg, repo);
2692 }
2693 
2694 const struct got_error *
2695 got_worktree_schedule_add(struct got_worktree *worktree,
2696     struct got_pathlist_head *paths,
2697     got_worktree_status_cb status_cb, void *status_arg,
2698     struct got_repository *repo)
2699 {
2700 	struct got_fileindex *fileindex = NULL;
2701 	char *fileindex_path = NULL;
2702 	const struct got_error *err = NULL, *sync_err, *unlockerr;
2703 	struct got_pathlist_entry *pe;
2704 
2705 	err = lock_worktree(worktree, LOCK_EX);
2706 	if (err)
2707 		return err;
2708 
2709 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
2710 	if (err)
2711 		goto done;
2712 
2713 	TAILQ_FOREACH(pe, paths, entry) {
2714 		char *ondisk_path;
2715 		if (asprintf(&ondisk_path, "%s/%s", worktree->root_path,
2716 		    pe->path) == -1)
2717 			return got_error_from_errno("asprintf");
2718 		err = schedule_addition(ondisk_path, fileindex, pe->path,
2719 		    status_cb, status_arg, repo);
2720 		free(ondisk_path);
2721 		if (err)
2722 			break;
2723 	}
2724 	sync_err = sync_fileindex(fileindex, fileindex_path);
2725 	if (sync_err && err == NULL)
2726 		err = sync_err;
2727 done:
2728 	free(fileindex_path);
2729 	if (fileindex)
2730 		got_fileindex_free(fileindex);
2731 	unlockerr = lock_worktree(worktree, LOCK_SH);
2732 	if (unlockerr && err == NULL)
2733 		err = unlockerr;
2734 	return err;
2735 }
2736 
2737 static const struct got_error *
2738 schedule_for_deletion(const char *ondisk_path, struct got_fileindex *fileindex,
2739     const char *relpath, int delete_local_mods,
2740     got_worktree_status_cb status_cb, void *status_arg,
2741     struct got_repository *repo)
2742 {
2743 	const struct got_error *err = NULL;
2744 	struct got_fileindex_entry *ie = NULL;
2745 	unsigned char status, staged_status;
2746 	struct stat sb;
2747 
2748 	ie = got_fileindex_entry_get(fileindex, relpath, strlen(relpath));
2749 	if (ie == NULL)
2750 		return got_error(GOT_ERR_BAD_PATH);
2751 
2752 	staged_status = get_staged_status(ie);
2753 	if (staged_status != GOT_STATUS_NO_CHANGE) {
2754 		if (staged_status == GOT_STATUS_DELETE)
2755 			return NULL;
2756 		return got_error_path(relpath, GOT_ERR_FILE_STAGED);
2757 	}
2758 
2759 	err = get_file_status(&status, &sb, ie, ondisk_path, repo);
2760 	if (err)
2761 		return err;
2762 
2763 	if (status != GOT_STATUS_NO_CHANGE) {
2764 		if (status == GOT_STATUS_DELETE)
2765 			return NULL;
2766 		if (status == GOT_STATUS_MODIFY && !delete_local_mods)
2767 			return got_error_path(relpath, GOT_ERR_FILE_MODIFIED);
2768 		if (status != GOT_STATUS_MODIFY &&
2769 		    status != GOT_STATUS_MISSING)
2770 			return got_error_path(relpath, GOT_ERR_FILE_STATUS);
2771 	}
2772 
2773 	if (status != GOT_STATUS_MISSING && unlink(ondisk_path) != 0)
2774 		return got_error_from_errno2("unlink", ondisk_path);
2775 
2776 	got_fileindex_entry_mark_deleted_from_disk(ie);
2777 	return report_file_status(ie, ondisk_path, status_cb, status_arg, repo);
2778 }
2779 
2780 const struct got_error *
2781 got_worktree_schedule_delete(struct got_worktree *worktree,
2782     struct got_pathlist_head *paths, int delete_local_mods,
2783     got_worktree_status_cb status_cb, void *status_arg,
2784     struct got_repository *repo)
2785 {
2786 	struct got_fileindex *fileindex = NULL;
2787 	char *fileindex_path = NULL;
2788 	const struct got_error *err = NULL, *sync_err, *unlockerr;
2789 	struct got_pathlist_entry *pe;
2790 
2791 	err = lock_worktree(worktree, LOCK_EX);
2792 	if (err)
2793 		return err;
2794 
2795 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
2796 	if (err)
2797 		goto done;
2798 
2799 	TAILQ_FOREACH(pe, paths, entry) {
2800 		char *ondisk_path;
2801 		if (asprintf(&ondisk_path, "%s/%s", worktree->root_path,
2802 		    pe->path) == -1)
2803 			return got_error_from_errno("asprintf");
2804 		err = schedule_for_deletion(ondisk_path, fileindex, pe->path,
2805 		    delete_local_mods, status_cb, status_arg, repo);
2806 		free(ondisk_path);
2807 		if (err)
2808 			break;
2809 	}
2810 	sync_err = sync_fileindex(fileindex, fileindex_path);
2811 	if (sync_err && err == NULL)
2812 		err = sync_err;
2813 done:
2814 	free(fileindex_path);
2815 	if (fileindex)
2816 		got_fileindex_free(fileindex);
2817 	unlockerr = lock_worktree(worktree, LOCK_SH);
2818 	if (unlockerr && err == NULL)
2819 		err = unlockerr;
2820 	return err;
2821 }
2822 
2823 static const struct got_error *
2824 copy_one_line(FILE *infile, FILE *outfile, FILE *rejectfile)
2825 {
2826 	const struct got_error *err = NULL;
2827 	char *line = NULL;
2828 	size_t linesize = 0, n;
2829 	ssize_t linelen;
2830 
2831 	linelen = getline(&line, &linesize, infile);
2832 	if (linelen == -1) {
2833 		if (ferror(infile)) {
2834 			err = got_error_from_errno("getline");
2835 			goto done;
2836 		}
2837 		return NULL;
2838 	}
2839 	if (outfile) {
2840 		n = fwrite(line, 1, linelen, outfile);
2841 		if (n != linelen) {
2842 			err = got_ferror(outfile, GOT_ERR_IO);
2843 			goto done;
2844 		}
2845 	}
2846 	if (rejectfile) {
2847 		n = fwrite(line, 1, linelen, rejectfile);
2848 		if (n != linelen)
2849 			err = got_ferror(outfile, GOT_ERR_IO);
2850 	}
2851 done:
2852 	free(line);
2853 	return err;
2854 }
2855 
2856 static const struct got_error *
2857 skip_one_line(FILE *f)
2858 {
2859 	char *line = NULL;
2860 	size_t linesize = 0;
2861 	ssize_t linelen;
2862 
2863 	linelen = getline(&line, &linesize, f);
2864 	free(line);
2865 	if (linelen == -1 && ferror(f))
2866 		return got_error_from_errno("getline");
2867 	return NULL;
2868 }
2869 
2870 static const struct got_error *
2871 copy_change(FILE *f1, FILE *f2, int *line_cur1, int *line_cur2,
2872     int start_old, int end_old, int start_new, int end_new,
2873     FILE *outfile, FILE *rejectfile)
2874  {
2875 	const struct got_error *err;
2876 
2877 	/* Copy old file's lines leading up to patch. */
2878 	while (!feof(f1) && *line_cur1 < start_old) {
2879 		err = copy_one_line(f1, outfile, NULL);
2880 		if (err)
2881 			return err;
2882 		(*line_cur1)++;
2883 	}
2884 	/* Skip new file's lines leading up to patch. */
2885 	while (!feof(f2) && *line_cur2 < start_new) {
2886 		if (rejectfile)
2887 			err = copy_one_line(f2, NULL, rejectfile);
2888 		else
2889 			err = skip_one_line(f2);
2890 		if (err)
2891 			return err;
2892 		(*line_cur2)++;
2893 	}
2894 	/* Copy patched lines. */
2895 	while (!feof(f2) && *line_cur2 <= end_new) {
2896 		err = copy_one_line(f2, outfile, NULL);
2897 		if (err)
2898 			return err;
2899 		(*line_cur2)++;
2900 	}
2901 	/* Skip over old file's replaced lines. */
2902 	while (!feof(f1) && *line_cur1 <= end_old) {
2903 		if (rejectfile)
2904 			err = copy_one_line(f1, NULL, rejectfile);
2905 		else
2906 			err = skip_one_line(f1);
2907 		if (err)
2908 			return err;
2909 		(*line_cur1)++;
2910 	}
2911 
2912 	return NULL;
2913 }
2914 
2915 static const struct got_error *
2916 copy_remaining_content(FILE *f1, FILE *f2, int *line_cur1, int *line_cur2,
2917     FILE *outfile, FILE *rejectfile)
2918 {
2919 	const struct got_error *err;
2920 
2921 	if (outfile) {
2922 		/* Copy old file's lines until EOF. */
2923 		while (!feof(f1)) {
2924 			err = copy_one_line(f1, outfile, NULL);
2925 			if (err)
2926 				return err;
2927 			(*line_cur1)++;
2928 		}
2929 	}
2930 	if (rejectfile) {
2931 		/* Copy new file's lines until EOF. */
2932 		while (!feof(f2)) {
2933 			err = copy_one_line(f2, NULL, rejectfile);
2934 			if (err)
2935 				return err;
2936 			(*line_cur2)++;
2937 		}
2938 	}
2939 
2940 	return NULL;
2941 }
2942 
2943 static const struct got_error *
2944 apply_or_reject_change(int *choice, struct got_diff_change *change, int n,
2945     int nchanges, struct got_diff_state *ds, struct got_diff_args *args,
2946     int diff_flags, const char *relpath, FILE *f1, FILE *f2, int *line_cur1,
2947     int *line_cur2, FILE *outfile, FILE *rejectfile,
2948     got_worktree_patch_cb patch_cb, void *patch_arg)
2949 {
2950 	const struct got_error *err = NULL;
2951 	int start_old = change->cv.a;
2952 	int end_old = change->cv.b;
2953 	int start_new = change->cv.c;
2954 	int end_new = change->cv.d;
2955 	long pos1, pos2;
2956 	FILE *hunkfile;
2957 
2958 	*choice = GOT_PATCH_CHOICE_NONE;
2959 
2960 	hunkfile = got_opentemp();
2961 	if (hunkfile == NULL)
2962 		return got_error_from_errno("got_opentemp");
2963 
2964 	pos1 = ftell(f1);
2965 	pos2 = ftell(f2);
2966 
2967 	/* XXX TODO needs error checking */
2968 	got_diff_dump_change(hunkfile, change, ds, args, f1, f2, diff_flags);
2969 
2970 	if (fseek(f1, pos1, SEEK_SET) == -1) {
2971 		err = got_ferror(f1, GOT_ERR_IO);
2972 		goto done;
2973 	}
2974 	if (fseek(f2, pos2, SEEK_SET) == -1) {
2975 		err = got_ferror(f1, GOT_ERR_IO);
2976 		goto done;
2977 	}
2978 	if (fseek(hunkfile, 0L, SEEK_SET) == -1) {
2979 		err = got_ferror(hunkfile, GOT_ERR_IO);
2980 		goto done;
2981 	}
2982 
2983 	err = (*patch_cb)(choice, patch_arg, GOT_STATUS_MODIFY, relpath,
2984 	    hunkfile, n, nchanges);
2985 	if (err)
2986 		goto done;
2987 
2988 	switch (*choice) {
2989 	case GOT_PATCH_CHOICE_YES:
2990 		err = copy_change(f1, f2, line_cur1, line_cur2, start_old,
2991 		    end_old, start_new, end_new, outfile, rejectfile);
2992 		break;
2993 	case GOT_PATCH_CHOICE_NO:
2994 		err = copy_change(f1, f2, line_cur1, line_cur2, start_old,
2995 		    end_old, start_new, end_new, rejectfile, outfile);
2996 		break;
2997 	case GOT_PATCH_CHOICE_QUIT:
2998 		break;
2999 	default:
3000 		err = got_error(GOT_ERR_PATCH_CHOICE);
3001 		break;
3002 	}
3003 done:
3004 	if (hunkfile && fclose(hunkfile) == EOF && err == NULL)
3005 		err = got_error_from_errno("fclose");
3006 	return err;
3007 }
3008 
3009 struct revert_file_args {
3010 	struct got_worktree *worktree;
3011 	struct got_fileindex *fileindex;
3012 	got_worktree_checkout_cb progress_cb;
3013 	void *progress_arg;
3014 	got_worktree_patch_cb patch_cb;
3015 	void *patch_arg;
3016 	struct got_repository *repo;
3017 };
3018 
3019 static const struct got_error *
3020 create_patched_content(char **path_outfile, int reverse_patch,
3021     struct got_object_id *blob_id, const char *path2,
3022     const char *relpath, struct got_repository *repo,
3023     got_worktree_patch_cb patch_cb, void *patch_arg)
3024 {
3025 	const struct got_error *err;
3026 	struct got_blob_object *blob = NULL;
3027 	FILE *f1 = NULL, *f2 = NULL, *outfile = NULL;
3028 	char *path1 = NULL, *id_str = NULL;
3029 	struct stat sb1, sb2;
3030 	struct got_diff_changes *changes = NULL;
3031 	struct got_diff_state *ds = NULL;
3032 	struct got_diff_args *args = NULL;
3033 	struct got_diff_change *change;
3034 	int diff_flags = 0, line_cur1 = 1, line_cur2 = 1, have_content = 0;
3035 	int n = 0;
3036 
3037 	*path_outfile = NULL;
3038 
3039 	err = got_object_id_str(&id_str, blob_id);
3040 	if (err)
3041 		return err;
3042 
3043 	f2 = fopen(path2, "r");
3044 	if (f2 == NULL) {
3045 		err = got_error_from_errno2("fopen", path2);
3046 		goto done;
3047 	}
3048 
3049 	err = got_object_open_as_blob(&blob, repo, blob_id, 8192);
3050 	if (err)
3051 		goto done;
3052 
3053 	err = got_opentemp_named(&path1, &f1, "got-patched-blob");
3054 	if (err)
3055 		goto done;
3056 
3057 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f1, blob);
3058 	if (err)
3059 		goto done;
3060 
3061 	if (stat(path1, &sb1) == -1) {
3062 		err = got_error_from_errno2("stat", path1);
3063 		goto done;
3064 	}
3065 	if (stat(path2, &sb2) == -1) {
3066 		err = got_error_from_errno2("stat", path2);
3067 		goto done;
3068 	}
3069 
3070 	err = got_diff_files(&changes, &ds, &args, &diff_flags,
3071 	    f1, sb1.st_size, id_str, f2, sb2.st_size, path2, 3, NULL);
3072 	if (err)
3073 		goto done;
3074 
3075 	err = got_opentemp_named(path_outfile, &outfile, "got-patched-content");
3076 	if (err)
3077 		goto done;
3078 
3079 	if (fseek(f1, 0L, SEEK_SET) == -1)
3080 		return got_ferror(f1, GOT_ERR_IO);
3081 	if (fseek(f2, 0L, SEEK_SET) == -1)
3082 		return got_ferror(f2, GOT_ERR_IO);
3083 	SIMPLEQ_FOREACH(change, &changes->entries, entry) {
3084 		int choice;
3085 		err = apply_or_reject_change(&choice, change, ++n,
3086 		    changes->nchanges, ds, args, diff_flags, relpath,
3087 		    f1, f2, &line_cur1, &line_cur2,
3088 		    reverse_patch ? NULL : outfile,
3089 		    reverse_patch ? outfile : NULL,
3090 		    patch_cb, patch_arg);
3091 		if (err)
3092 			goto done;
3093 		if (choice == GOT_PATCH_CHOICE_YES)
3094 			have_content = 1;
3095 		else if (choice == GOT_PATCH_CHOICE_QUIT)
3096 			break;
3097 	}
3098 	if (have_content)
3099 		err = copy_remaining_content(f1, f2, &line_cur1, &line_cur2,
3100 		    reverse_patch ? NULL : outfile,
3101 		    reverse_patch ? outfile : NULL);
3102 done:
3103 	free(id_str);
3104 	if (blob)
3105 		got_object_blob_close(blob);
3106 	if (f1 && fclose(f1) == EOF && err == NULL)
3107 		err = got_error_from_errno2("fclose", path1);
3108 	if (f2 && fclose(f2) == EOF && err == NULL)
3109 		err = got_error_from_errno2("fclose", path2);
3110 	if (outfile && fclose(outfile) == EOF && err == NULL)
3111 		err = got_error_from_errno2("fclose", *path_outfile);
3112 	if (path1 && unlink(path1) == -1 && err == NULL)
3113 		err = got_error_from_errno2("unlink", path1);
3114 	if (err || !have_content) {
3115 		if (*path_outfile && unlink(*path_outfile) == -1 && err == NULL)
3116 			err = got_error_from_errno2("unlink", *path_outfile);
3117 		free(*path_outfile);
3118 		*path_outfile = NULL;
3119 	}
3120 	free(args);
3121 	if (ds) {
3122 		got_diff_state_free(ds);
3123 		free(ds);
3124 	}
3125 	if (changes)
3126 		got_diff_free_changes(changes);
3127 	free(path1);
3128 	return err;
3129 }
3130 
3131 static const struct got_error *
3132 revert_file(void *arg, unsigned char status, unsigned char staged_status,
3133     const char *relpath, struct got_object_id *blob_id,
3134     struct got_object_id *staged_blob_id, struct got_object_id *commit_id)
3135 {
3136 	struct revert_file_args *a = arg;
3137 	const struct got_error *err = NULL;
3138 	char *parent_path = NULL;
3139 	struct got_fileindex_entry *ie;
3140 	struct got_tree_object *tree = NULL;
3141 	struct got_object_id *tree_id = NULL;
3142 	const struct got_tree_entry *te = NULL;
3143 	char *tree_path = NULL, *te_name;
3144 	char *ondisk_path = NULL, *path_content = NULL;
3145 	struct got_blob_object *blob = NULL;
3146 
3147 	/* Reverting a staged deletion is a no-op. */
3148 	if (status == GOT_STATUS_DELETE &&
3149 	    staged_status != GOT_STATUS_NO_CHANGE)
3150 		return NULL;
3151 
3152 	if (status == GOT_STATUS_UNVERSIONED)
3153 		return (*a->progress_cb)(a->progress_arg,
3154 		    GOT_STATUS_UNVERSIONED, relpath);
3155 
3156 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
3157 	if (ie == NULL)
3158 		return got_error(GOT_ERR_BAD_PATH);
3159 
3160 	/* Construct in-repository path of tree which contains this blob. */
3161 	err = got_path_dirname(&parent_path, ie->path);
3162 	if (err) {
3163 		if (err->code != GOT_ERR_BAD_PATH)
3164 			goto done;
3165 		parent_path = strdup("/");
3166 		if (parent_path == NULL) {
3167 			err = got_error_from_errno("strdup");
3168 			goto done;
3169 		}
3170 	}
3171 	if (got_path_is_root_dir(a->worktree->path_prefix)) {
3172 		tree_path = strdup(parent_path);
3173 		if (tree_path == NULL) {
3174 			err = got_error_from_errno("strdup");
3175 			goto done;
3176 		}
3177 	} else {
3178 		if (got_path_is_root_dir(parent_path)) {
3179 			tree_path = strdup(a->worktree->path_prefix);
3180 			if (tree_path == NULL) {
3181 				err = got_error_from_errno("strdup");
3182 				goto done;
3183 			}
3184 		} else {
3185 			if (asprintf(&tree_path, "%s/%s",
3186 			    a->worktree->path_prefix, parent_path) == -1) {
3187 				err = got_error_from_errno("asprintf");
3188 				goto done;
3189 			}
3190 		}
3191 	}
3192 
3193 	err = got_object_id_by_path(&tree_id, a->repo,
3194 	    a->worktree->base_commit_id, tree_path);
3195 	if (err) {
3196 		if (!(err->code == GOT_ERR_NO_TREE_ENTRY &&
3197 		    (status == GOT_STATUS_ADD ||
3198 		    staged_status == GOT_STATUS_ADD)))
3199 			goto done;
3200 	} else {
3201 		err = got_object_open_as_tree(&tree, a->repo, tree_id);
3202 		if (err)
3203 			goto done;
3204 
3205 		te_name = basename(ie->path);
3206 		if (te_name == NULL) {
3207 			err = got_error_from_errno2("basename", ie->path);
3208 			goto done;
3209 		}
3210 
3211 		te = got_object_tree_find_entry(tree, te_name);
3212 		if (te == NULL && status != GOT_STATUS_ADD &&
3213 		    staged_status != GOT_STATUS_ADD) {
3214 			err = got_error(GOT_ERR_NO_TREE_ENTRY);
3215 			goto done;
3216 		}
3217 	}
3218 
3219 	switch (status) {
3220 	case GOT_STATUS_ADD:
3221 		if (a->patch_cb) {
3222 			int choice = GOT_PATCH_CHOICE_NONE;
3223 			err = (*a->patch_cb)(&choice, a->patch_arg,
3224 			    status, ie->path, NULL, 1, 1);
3225 			if (err)
3226 				goto done;
3227 			if (choice != GOT_PATCH_CHOICE_YES)
3228 				break;
3229 		}
3230 		err = (*a->progress_cb)(a->progress_arg, GOT_STATUS_REVERT,
3231 		    ie->path);
3232 		if (err)
3233 			goto done;
3234 		got_fileindex_entry_remove(a->fileindex, ie);
3235 		break;
3236 	case GOT_STATUS_DELETE:
3237 		if (a->patch_cb) {
3238 			int choice = GOT_PATCH_CHOICE_NONE;
3239 			err = (*a->patch_cb)(&choice, a->patch_arg,
3240 			    status, ie->path, NULL, 1, 1);
3241 			if (err)
3242 				goto done;
3243 			if (choice != GOT_PATCH_CHOICE_YES)
3244 				break;
3245 		}
3246 		/* fall through */
3247 	case GOT_STATUS_MODIFY:
3248 	case GOT_STATUS_CONFLICT:
3249 	case GOT_STATUS_MISSING: {
3250 		struct got_object_id id;
3251 		if (staged_status == GOT_STATUS_ADD ||
3252 		    staged_status == GOT_STATUS_MODIFY) {
3253 			memcpy(id.sha1, ie->staged_blob_sha1,
3254 			    SHA1_DIGEST_LENGTH);
3255 		} else
3256 			memcpy(id.sha1, ie->blob_sha1,
3257 			    SHA1_DIGEST_LENGTH);
3258 		err = got_object_open_as_blob(&blob, a->repo, &id, 8192);
3259 		if (err)
3260 			goto done;
3261 
3262 		if (asprintf(&ondisk_path, "%s/%s",
3263 		    got_worktree_get_root_path(a->worktree), relpath) == -1) {
3264 			err = got_error_from_errno("asprintf");
3265 			goto done;
3266 		}
3267 
3268 		if (a->patch_cb && (status == GOT_STATUS_MODIFY ||
3269 		    status == GOT_STATUS_CONFLICT)) {
3270 			err = create_patched_content(&path_content, 1, &id,
3271 			    ondisk_path, ie->path, a->repo,
3272 			    a->patch_cb, a->patch_arg);
3273 			if (err || path_content == NULL)
3274 				break;
3275 			if (rename(path_content, ondisk_path) == -1) {
3276 				err = got_error_from_errno3("rename",
3277 				    path_content, ondisk_path);
3278 				goto done;
3279 			}
3280 		} else {
3281 			err = install_blob(a->worktree, ondisk_path, ie->path,
3282 			    te ? te->mode : GOT_DEFAULT_FILE_MODE,
3283 			    got_fileindex_perms_to_st(ie), blob, 0, 1,
3284 			    a->repo, a->progress_cb, a->progress_arg);
3285 			if (err)
3286 				goto done;
3287 			if (status == GOT_STATUS_DELETE) {
3288 				err = update_blob_fileindex_entry(a->worktree,
3289 				    a->fileindex, ie, ondisk_path, ie->path,
3290 				    blob, 1);
3291 				if (err)
3292 					goto done;
3293 			}
3294 		}
3295 		break;
3296 	}
3297 	default:
3298 		break;
3299 	}
3300 done:
3301 	free(ondisk_path);
3302 	free(path_content);
3303 	free(parent_path);
3304 	free(tree_path);
3305 	if (blob)
3306 		got_object_blob_close(blob);
3307 	if (tree)
3308 		got_object_tree_close(tree);
3309 	free(tree_id);
3310 	return err;
3311 }
3312 
3313 const struct got_error *
3314 got_worktree_revert(struct got_worktree *worktree,
3315     struct got_pathlist_head *paths,
3316     got_worktree_checkout_cb progress_cb, void *progress_arg,
3317     got_worktree_patch_cb patch_cb, void *patch_arg,
3318     struct got_repository *repo)
3319 {
3320 	struct got_fileindex *fileindex = NULL;
3321 	char *fileindex_path = NULL;
3322 	const struct got_error *err = NULL, *unlockerr = NULL;
3323 	const struct got_error *sync_err = NULL;
3324 	struct got_pathlist_entry *pe;
3325 	struct revert_file_args rfa;
3326 
3327 	err = lock_worktree(worktree, LOCK_EX);
3328 	if (err)
3329 		return err;
3330 
3331 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
3332 	if (err)
3333 		goto done;
3334 
3335 	rfa.worktree = worktree;
3336 	rfa.fileindex = fileindex;
3337 	rfa.progress_cb = progress_cb;
3338 	rfa.progress_arg = progress_arg;
3339 	rfa.patch_cb = patch_cb;
3340 	rfa.patch_arg = patch_arg;
3341 	rfa.repo = repo;
3342 	TAILQ_FOREACH(pe, paths, entry) {
3343 		err = worktree_status(worktree, pe->path, fileindex, repo,
3344 		    revert_file, &rfa, NULL, NULL);
3345 		if (err)
3346 			break;
3347 	}
3348 	sync_err = sync_fileindex(fileindex, fileindex_path);
3349 	if (sync_err && err == NULL)
3350 		err = sync_err;
3351 done:
3352 	free(fileindex_path);
3353 	if (fileindex)
3354 		got_fileindex_free(fileindex);
3355 	unlockerr = lock_worktree(worktree, LOCK_SH);
3356 	if (unlockerr && err == NULL)
3357 		err = unlockerr;
3358 	return err;
3359 }
3360 
3361 static void
3362 free_commitable(struct got_commitable *ct)
3363 {
3364 	free(ct->path);
3365 	free(ct->in_repo_path);
3366 	free(ct->ondisk_path);
3367 	free(ct->blob_id);
3368 	free(ct->base_blob_id);
3369 	free(ct->staged_blob_id);
3370 	free(ct->base_commit_id);
3371 	free(ct);
3372 }
3373 
3374 struct collect_commitables_arg {
3375 	struct got_pathlist_head *commitable_paths;
3376 	struct got_repository *repo;
3377 	struct got_worktree *worktree;
3378 	int have_staged_files;
3379 };
3380 
3381 static const struct got_error *
3382 collect_commitables(void *arg, unsigned char status,
3383     unsigned char staged_status, const char *relpath,
3384     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
3385     struct got_object_id *commit_id)
3386 {
3387 	struct collect_commitables_arg *a = arg;
3388 	const struct got_error *err = NULL;
3389 	struct got_commitable *ct = NULL;
3390 	struct got_pathlist_entry *new = NULL;
3391 	char *parent_path = NULL, *path = NULL;
3392 	struct stat sb;
3393 
3394 	if (a->have_staged_files) {
3395 		if (staged_status != GOT_STATUS_MODIFY &&
3396 		    staged_status != GOT_STATUS_ADD &&
3397 		    staged_status != GOT_STATUS_DELETE)
3398 			return NULL;
3399 	} else {
3400 		if (status == GOT_STATUS_CONFLICT)
3401 			return got_error(GOT_ERR_COMMIT_CONFLICT);
3402 
3403 		if (status != GOT_STATUS_MODIFY &&
3404 		    status != GOT_STATUS_ADD &&
3405 		    status != GOT_STATUS_DELETE)
3406 			return NULL;
3407 	}
3408 
3409 	if (asprintf(&path, "/%s", relpath) == -1) {
3410 		err = got_error_from_errno("asprintf");
3411 		goto done;
3412 	}
3413 	if (strcmp(path, "/") == 0) {
3414 		parent_path = strdup("");
3415 		if (parent_path == NULL)
3416 			return got_error_from_errno("strdup");
3417 	} else {
3418 		err = got_path_dirname(&parent_path, path);
3419 		if (err)
3420 			return err;
3421 	}
3422 
3423 	ct = calloc(1, sizeof(*ct));
3424 	if (ct == NULL) {
3425 		err = got_error_from_errno("calloc");
3426 		goto done;
3427 	}
3428 
3429 	if (asprintf(&ct->ondisk_path, "%s/%s", a->worktree->root_path,
3430 	    relpath) == -1) {
3431 		err = got_error_from_errno("asprintf");
3432 		goto done;
3433 	}
3434 	if (status == GOT_STATUS_DELETE || staged_status == GOT_STATUS_DELETE) {
3435 		sb.st_mode = GOT_DEFAULT_FILE_MODE;
3436 	} else {
3437 		if (lstat(ct->ondisk_path, &sb) != 0) {
3438 			err = got_error_from_errno2("lstat", ct->ondisk_path);
3439 			goto done;
3440 		}
3441 		ct->mode = sb.st_mode;
3442 	}
3443 
3444 	if (asprintf(&ct->in_repo_path, "%s%s%s", a->worktree->path_prefix,
3445 	    got_path_is_root_dir(a->worktree->path_prefix) ? "" : "/",
3446 	    relpath) == -1) {
3447 		err = got_error_from_errno("asprintf");
3448 		goto done;
3449 	}
3450 
3451 	ct->status = status;
3452 	ct->staged_status = staged_status;
3453 	ct->blob_id = NULL; /* will be filled in when blob gets created */
3454 	if (ct->status != GOT_STATUS_ADD &&
3455 	    ct->staged_status != GOT_STATUS_ADD) {
3456 		ct->base_blob_id = got_object_id_dup(blob_id);
3457 		if (ct->base_blob_id == NULL) {
3458 			err = got_error_from_errno("got_object_id_dup");
3459 			goto done;
3460 		}
3461 		ct->base_commit_id = got_object_id_dup(commit_id);
3462 		if (ct->base_commit_id == NULL) {
3463 			err = got_error_from_errno("got_object_id_dup");
3464 			goto done;
3465 		}
3466 	}
3467 	if (ct->staged_status == GOT_STATUS_ADD ||
3468 	    ct->staged_status == GOT_STATUS_MODIFY) {
3469 		ct->staged_blob_id = got_object_id_dup(staged_blob_id);
3470 		if (ct->staged_blob_id == NULL) {
3471 			err = got_error_from_errno("got_object_id_dup");
3472 			goto done;
3473 		}
3474 	}
3475 	ct->path = strdup(path);
3476 	if (ct->path == NULL) {
3477 		err = got_error_from_errno("strdup");
3478 		goto done;
3479 	}
3480 	err = got_pathlist_insert(&new, a->commitable_paths, ct->path, ct);
3481 done:
3482 	if (ct && (err || new == NULL))
3483 		free_commitable(ct);
3484 	free(parent_path);
3485 	free(path);
3486 	return err;
3487 }
3488 
3489 static const struct got_error *write_tree(struct got_object_id **,
3490     struct got_tree_object *, const char *, struct got_pathlist_head *,
3491     got_worktree_status_cb status_cb, void *status_arg,
3492     struct got_repository *);
3493 
3494 static const struct got_error *
3495 write_subtree(struct got_object_id **new_subtree_id,
3496     struct got_tree_entry *te, const char *parent_path,
3497     struct got_pathlist_head *commitable_paths,
3498     got_worktree_status_cb status_cb, void *status_arg,
3499     struct got_repository *repo)
3500 {
3501 	const struct got_error *err = NULL;
3502 	struct got_tree_object *subtree;
3503 	char *subpath;
3504 
3505 	if (asprintf(&subpath, "%s%s%s", parent_path,
3506 	    got_path_is_root_dir(parent_path) ? "" : "/", te->name) == -1)
3507 		return got_error_from_errno("asprintf");
3508 
3509 	err = got_object_open_as_tree(&subtree, repo, te->id);
3510 	if (err)
3511 		return err;
3512 
3513 	err = write_tree(new_subtree_id, subtree, subpath, commitable_paths,
3514 	    status_cb, status_arg, repo);
3515 	got_object_tree_close(subtree);
3516 	free(subpath);
3517 	return err;
3518 }
3519 
3520 static const struct got_error *
3521 match_ct_parent_path(int *match, struct got_commitable *ct, const char *path)
3522 {
3523 	const struct got_error *err = NULL;
3524 	char *ct_parent_path = NULL;
3525 
3526 	*match = 0;
3527 
3528 	if (strchr(ct->in_repo_path, '/') == NULL) {
3529 		*match = got_path_is_root_dir(path);
3530 		return NULL;
3531 	}
3532 
3533 	err = got_path_dirname(&ct_parent_path, ct->in_repo_path);
3534 	if (err)
3535 		return err;
3536 	*match = (strcmp(path, ct_parent_path) == 0);
3537 	free(ct_parent_path);
3538 	return err;
3539 }
3540 
3541 static mode_t
3542 get_ct_file_mode(struct got_commitable *ct)
3543 {
3544 	return S_IFREG | (ct->mode & ((S_IRWXU | S_IRWXG | S_IRWXO)));
3545 }
3546 
3547 static const struct got_error *
3548 alloc_modified_blob_tree_entry(struct got_tree_entry **new_te,
3549     struct got_tree_entry *te, struct got_commitable *ct)
3550 {
3551 	const struct got_error *err = NULL;
3552 
3553 	*new_te = NULL;
3554 
3555 	err = got_object_tree_entry_dup(new_te, te);
3556 	if (err)
3557 		goto done;
3558 
3559 	(*new_te)->mode = get_ct_file_mode(ct);
3560 
3561 	free((*new_te)->id);
3562 	if (ct->staged_status == GOT_STATUS_MODIFY)
3563 		(*new_te)->id = got_object_id_dup(ct->staged_blob_id);
3564 	else
3565 		(*new_te)->id = got_object_id_dup(ct->blob_id);
3566 	if ((*new_te)->id == NULL) {
3567 		err = got_error_from_errno("got_object_id_dup");
3568 		goto done;
3569 	}
3570 done:
3571 	if (err && *new_te) {
3572 		got_object_tree_entry_close(*new_te);
3573 		*new_te = NULL;
3574 	}
3575 	return err;
3576 }
3577 
3578 static const struct got_error *
3579 alloc_added_blob_tree_entry(struct got_tree_entry **new_te,
3580     struct got_commitable *ct)
3581 {
3582 	const struct got_error *err = NULL;
3583 	char *ct_name;
3584 
3585 	 *new_te = NULL;
3586 
3587 	*new_te = calloc(1, sizeof(**new_te));
3588 	if (*new_te == NULL)
3589 		return got_error_from_errno("calloc");
3590 
3591 	ct_name = basename(ct->path);
3592 	if (ct_name == NULL) {
3593 		err = got_error_from_errno2("basename", ct->path);
3594 		goto done;
3595 	}
3596 	(*new_te)->name = strdup(ct_name);
3597 	if ((*new_te)->name == NULL) {
3598 		err = got_error_from_errno("strdup");
3599 		goto done;
3600 	}
3601 
3602 	(*new_te)->mode = get_ct_file_mode(ct);
3603 
3604 	if (ct->staged_status == GOT_STATUS_ADD)
3605 		(*new_te)->id = got_object_id_dup(ct->staged_blob_id);
3606 	else
3607 		(*new_te)->id = got_object_id_dup(ct->blob_id);
3608 	if ((*new_te)->id == NULL) {
3609 		err = got_error_from_errno("got_object_id_dup");
3610 		goto done;
3611 	}
3612 done:
3613 	if (err && *new_te) {
3614 		got_object_tree_entry_close(*new_te);
3615 		*new_te = NULL;
3616 	}
3617 	return err;
3618 }
3619 
3620 static const struct got_error *
3621 insert_tree_entry(struct got_tree_entry *new_te,
3622     struct got_pathlist_head *paths)
3623 {
3624 	const struct got_error *err = NULL;
3625 	struct got_pathlist_entry *new_pe;
3626 
3627 	err = got_pathlist_insert(&new_pe, paths, new_te->name, new_te);
3628 	if (err)
3629 		return err;
3630 	if (new_pe == NULL)
3631 		return got_error(GOT_ERR_TREE_DUP_ENTRY);
3632 	return NULL;
3633 }
3634 
3635 static const struct got_error *
3636 report_ct_status(struct got_commitable *ct,
3637     got_worktree_status_cb status_cb, void *status_arg)
3638 {
3639 	const char *ct_path = ct->path;
3640 	unsigned char status;
3641 
3642 	while (ct_path[0] == '/')
3643 		ct_path++;
3644 
3645 	if (ct->staged_status != GOT_STATUS_NO_CHANGE)
3646 		status = ct->staged_status;
3647 	else
3648 		status = ct->status;
3649 
3650 	return (*status_cb)(status_arg, status, GOT_STATUS_NO_CHANGE,
3651 	    ct_path, ct->blob_id, NULL, NULL);
3652 }
3653 
3654 static const struct got_error *
3655 match_modified_subtree(int *modified, struct got_tree_entry *te,
3656     const char *base_tree_path, struct got_pathlist_head *commitable_paths)
3657 {
3658 	const struct got_error *err = NULL;
3659 	struct got_pathlist_entry *pe;
3660 	char *te_path;
3661 
3662 	*modified = 0;
3663 
3664 	if (asprintf(&te_path, "%s%s%s", base_tree_path,
3665 	    got_path_is_root_dir(base_tree_path) ? "" : "/",
3666 	    te->name) == -1)
3667 		return got_error_from_errno("asprintf");
3668 
3669 	TAILQ_FOREACH(pe, commitable_paths, entry) {
3670 		struct got_commitable *ct = pe->data;
3671 		*modified = got_path_is_child(ct->in_repo_path, te_path,
3672 		    strlen(te_path));
3673 		 if (*modified)
3674 			break;
3675 	}
3676 
3677 	free(te_path);
3678 	return err;
3679 }
3680 
3681 static const struct got_error *
3682 match_deleted_or_modified_ct(struct got_commitable **ctp,
3683     struct got_tree_entry *te, const char *base_tree_path,
3684     struct got_pathlist_head *commitable_paths)
3685 {
3686 	const struct got_error *err = NULL;
3687 	struct got_pathlist_entry *pe;
3688 
3689 	*ctp = NULL;
3690 
3691 	TAILQ_FOREACH(pe, commitable_paths, entry) {
3692 		struct got_commitable *ct = pe->data;
3693 		char *ct_name = NULL;
3694 		int path_matches;
3695 
3696 		if (ct->staged_status == GOT_STATUS_NO_CHANGE) {
3697 			if (ct->status != GOT_STATUS_MODIFY &&
3698 			    ct->status != GOT_STATUS_DELETE)
3699 				continue;
3700 		} else {
3701 			if (ct->staged_status != GOT_STATUS_MODIFY &&
3702 			    ct->staged_status != GOT_STATUS_DELETE)
3703 				continue;
3704 		}
3705 
3706 		if (got_object_id_cmp(ct->base_blob_id, te->id) != 0)
3707 			continue;
3708 
3709 		 err = match_ct_parent_path(&path_matches, ct, base_tree_path);
3710 		 if (err)
3711 			return err;
3712 		if (!path_matches)
3713 			continue;
3714 
3715 		ct_name = basename(pe->path);
3716 		if (ct_name == NULL)
3717 			return got_error_from_errno2("basename", pe->path);
3718 
3719 		if (strcmp(te->name, ct_name) != 0)
3720 			continue;
3721 
3722 		*ctp = ct;
3723 		break;
3724 	}
3725 
3726 	return err;
3727 }
3728 
3729 static const struct got_error *
3730 make_subtree_for_added_blob(struct got_tree_entry **new_tep,
3731     const char *child_path, const char *path_base_tree,
3732     struct got_pathlist_head *commitable_paths,
3733     got_worktree_status_cb status_cb, void *status_arg,
3734     struct got_repository *repo)
3735 {
3736 	const struct got_error *err = NULL;
3737 	struct got_tree_entry *new_te;
3738 	char *subtree_path;
3739 
3740 	*new_tep = NULL;
3741 
3742 	if (asprintf(&subtree_path, "%s%s%s", path_base_tree,
3743 	    got_path_is_root_dir(path_base_tree) ? "" : "/",
3744 	    child_path) == -1)
3745 		return got_error_from_errno("asprintf");
3746 
3747 	new_te = calloc(1, sizeof(*new_te));
3748 	new_te->mode = S_IFDIR;
3749 	new_te->name = strdup(child_path);
3750 	if (new_te->name == NULL) {
3751 		err = got_error_from_errno("strdup");
3752 		got_object_tree_entry_close(new_te);
3753 		goto done;
3754 	}
3755 	err = write_tree(&new_te->id, NULL, subtree_path,
3756 	    commitable_paths, status_cb, status_arg, repo);
3757 	if (err) {
3758 		got_object_tree_entry_close(new_te);
3759 		goto done;
3760 	}
3761 done:
3762 	free(subtree_path);
3763 	if (err == NULL)
3764 		*new_tep = new_te;
3765 	return err;
3766 }
3767 
3768 static const struct got_error *
3769 write_tree(struct got_object_id **new_tree_id,
3770     struct got_tree_object *base_tree, const char *path_base_tree,
3771     struct got_pathlist_head *commitable_paths,
3772     got_worktree_status_cb status_cb, void *status_arg,
3773     struct got_repository *repo)
3774 {
3775 	const struct got_error *err = NULL;
3776 	const struct got_tree_entries *base_entries = NULL;
3777 	struct got_pathlist_head paths;
3778 	struct got_tree_entries new_tree_entries;
3779 	struct got_tree_entry *te, *new_te = NULL;
3780 	struct got_pathlist_entry *pe;
3781 
3782 	TAILQ_INIT(&paths);
3783 	new_tree_entries.nentries = 0;
3784 	SIMPLEQ_INIT(&new_tree_entries.head);
3785 
3786 	/* Insert, and recurse into, newly added entries first. */
3787 	TAILQ_FOREACH(pe, commitable_paths, entry) {
3788 		struct got_commitable *ct = pe->data;
3789 		char *child_path = NULL, *slash;
3790 
3791 		if ((ct->status != GOT_STATUS_ADD &&
3792 		    ct->staged_status != GOT_STATUS_ADD) ||
3793 		    (ct->flags & GOT_COMMITABLE_ADDED))
3794 			continue;
3795 
3796 		 if (!got_path_is_child(pe->path, path_base_tree,
3797 		     strlen(path_base_tree)))
3798 			continue;
3799 
3800 		err = got_path_skip_common_ancestor(&child_path, path_base_tree,
3801 		    pe->path);
3802 		if (err)
3803 			goto done;
3804 
3805 		slash = strchr(child_path, '/');
3806 		if (slash == NULL) {
3807 			err = alloc_added_blob_tree_entry(&new_te, ct);
3808 			if (err)
3809 				goto done;
3810 			err = report_ct_status(ct, status_cb, status_arg);
3811 			if (err)
3812 				goto done;
3813 			ct->flags |= GOT_COMMITABLE_ADDED;
3814 			err = insert_tree_entry(new_te, &paths);
3815 			if (err)
3816 				goto done;
3817 		} else {
3818 			*slash = '\0'; /* trim trailing path components */
3819 			if (base_tree == NULL ||
3820 			    got_object_tree_find_entry(base_tree, child_path)
3821 			    == NULL) {
3822 				err = make_subtree_for_added_blob(&new_te,
3823 				    child_path, path_base_tree,
3824 				    commitable_paths, status_cb, status_arg,
3825 				    repo);
3826 				if (err)
3827 					goto done;
3828 				err = insert_tree_entry(new_te, &paths);
3829 				if (err)
3830 					goto done;
3831 			}
3832 		}
3833 	}
3834 
3835 	if (base_tree) {
3836 		/* Handle modified and deleted entries. */
3837 		base_entries = got_object_tree_get_entries(base_tree);
3838 		SIMPLEQ_FOREACH(te, &base_entries->head, entry) {
3839 			struct got_commitable *ct = NULL;
3840 
3841 			if (got_object_tree_entry_is_submodule(te)) {
3842 				/* Entry is a submodule; just copy it. */
3843 				err = got_object_tree_entry_dup(&new_te, te);
3844 				if (err)
3845 					goto done;
3846 				err = insert_tree_entry(new_te, &paths);
3847 				if (err)
3848 					goto done;
3849 				continue;
3850 			}
3851 
3852 			if (S_ISDIR(te->mode)) {
3853 				int modified;
3854 				err = got_object_tree_entry_dup(&new_te, te);
3855 				if (err)
3856 					goto done;
3857 				err = match_modified_subtree(&modified, te,
3858 				    path_base_tree, commitable_paths);
3859 				if (err)
3860 					goto done;
3861 				/* Avoid recursion into unmodified subtrees. */
3862 				if (modified) {
3863 					free(new_te->id);
3864 					err = write_subtree(&new_te->id, te,
3865 					    path_base_tree, commitable_paths,
3866 					    status_cb, status_arg, repo);
3867 					if (err)
3868 						goto done;
3869 				}
3870 				err = insert_tree_entry(new_te, &paths);
3871 				if (err)
3872 					goto done;
3873 				continue;
3874 			}
3875 
3876 			err = match_deleted_or_modified_ct(&ct, te,
3877 			    path_base_tree, commitable_paths);
3878 			if (ct) {
3879 				/* NB: Deleted entries get dropped here. */
3880 				if (ct->status == GOT_STATUS_MODIFY ||
3881 				    ct->staged_status == GOT_STATUS_MODIFY) {
3882 					err = alloc_modified_blob_tree_entry(
3883 					    &new_te, te, ct);
3884 					if (err)
3885 						goto done;
3886 					err = insert_tree_entry(new_te, &paths);
3887 					if (err)
3888 						goto done;
3889 				}
3890 				err = report_ct_status(ct, status_cb,
3891 				    status_arg);
3892 				if (err)
3893 					goto done;
3894 			} else {
3895 				/* Entry is unchanged; just copy it. */
3896 				err = got_object_tree_entry_dup(&new_te, te);
3897 				if (err)
3898 					goto done;
3899 				err = insert_tree_entry(new_te, &paths);
3900 				if (err)
3901 					goto done;
3902 			}
3903 		}
3904 	}
3905 
3906 	/* Write new list of entries; deleted entries have been dropped. */
3907 	TAILQ_FOREACH(pe, &paths, entry) {
3908 		struct got_tree_entry *te = pe->data;
3909 		new_tree_entries.nentries++;
3910 		SIMPLEQ_INSERT_TAIL(&new_tree_entries.head, te, entry);
3911 	}
3912 	err = got_object_tree_create(new_tree_id, &new_tree_entries, repo);
3913 done:
3914 	got_object_tree_entries_close(&new_tree_entries);
3915 	got_pathlist_free(&paths);
3916 	return err;
3917 }
3918 
3919 static const struct got_error *
3920 update_fileindex_after_commit(struct got_pathlist_head *commitable_paths,
3921     struct got_object_id *new_base_commit_id, struct got_fileindex *fileindex)
3922 {
3923 	const struct got_error *err = NULL;
3924 	struct got_pathlist_entry *pe;
3925 
3926 	TAILQ_FOREACH(pe, commitable_paths, entry) {
3927 		struct got_fileindex_entry *ie;
3928 		struct got_commitable *ct = pe->data;
3929 
3930 		ie = got_fileindex_entry_get(fileindex, pe->path, pe->path_len);
3931 		if (ie) {
3932 			if (ct->status == GOT_STATUS_DELETE ||
3933 			    ct->staged_status == GOT_STATUS_DELETE) {
3934 				got_fileindex_entry_remove(fileindex, ie);
3935 				got_fileindex_entry_free(ie);
3936 			} else if (ct->staged_status == GOT_STATUS_ADD ||
3937 			    ct->staged_status == GOT_STATUS_MODIFY) {
3938 				got_fileindex_entry_stage_set(ie,
3939 				    GOT_FILEIDX_STAGE_NONE);
3940 				err = got_fileindex_entry_update(ie,
3941 				    ct->ondisk_path, ct->staged_blob_id->sha1,
3942 				    new_base_commit_id->sha1, 1);
3943 			} else
3944 				err = got_fileindex_entry_update(ie,
3945 				    ct->ondisk_path, ct->blob_id->sha1,
3946 				    new_base_commit_id->sha1, 1);
3947 		} else {
3948 			err = got_fileindex_entry_alloc(&ie,
3949 			    ct->ondisk_path, pe->path, ct->blob_id->sha1,
3950 			    new_base_commit_id->sha1);
3951 			if (err)
3952 				break;
3953 			err = got_fileindex_entry_add(fileindex, ie);
3954 			if (err)
3955 				break;
3956 		}
3957 	}
3958 	return err;
3959 }
3960 
3961 
3962 static const struct got_error *
3963 check_out_of_date(const char *in_repo_path, unsigned char status,
3964     unsigned char staged_status, struct got_object_id *base_blob_id,
3965     struct got_object_id *base_commit_id,
3966     struct got_object_id *head_commit_id, struct got_repository *repo,
3967     int ood_errcode)
3968 {
3969 	const struct got_error *err = NULL;
3970 	struct got_object_id *id = NULL;
3971 
3972 	if (status != GOT_STATUS_ADD && staged_status != GOT_STATUS_ADD) {
3973 		/* Trivial case: base commit == head commit */
3974 		if (got_object_id_cmp(base_commit_id, head_commit_id) == 0)
3975 			return NULL;
3976 		/*
3977 		 * Ensure file content which local changes were based
3978 		 * on matches file content in the branch head.
3979 		 */
3980 		err = got_object_id_by_path(&id, repo, head_commit_id,
3981 		    in_repo_path);
3982 		if (err) {
3983 			if (err->code == GOT_ERR_NO_TREE_ENTRY)
3984 				err = got_error(ood_errcode);
3985 			goto done;
3986 		} else if (got_object_id_cmp(id, base_blob_id) != 0)
3987 			err = got_error(ood_errcode);
3988 	} else {
3989 		/* Require that added files don't exist in the branch head. */
3990 		err = got_object_id_by_path(&id, repo, head_commit_id,
3991 		    in_repo_path);
3992 		if (err && err->code != GOT_ERR_NO_TREE_ENTRY)
3993 			goto done;
3994 		err = id ? got_error(ood_errcode) : NULL;
3995 	}
3996 done:
3997 	free(id);
3998 	return err;
3999 }
4000 
4001 const struct got_error *
4002 commit_worktree(struct got_object_id **new_commit_id,
4003     struct got_pathlist_head *commitable_paths,
4004     struct got_object_id *head_commit_id, struct got_worktree *worktree,
4005     const char *author, const char *committer,
4006     got_worktree_commit_msg_cb commit_msg_cb, void *commit_arg,
4007     got_worktree_status_cb status_cb, void *status_arg,
4008     struct got_repository *repo)
4009 {
4010 	const struct got_error *err = NULL, *unlockerr = NULL;
4011 	struct got_pathlist_entry *pe;
4012 	const char *head_ref_name = NULL;
4013 	struct got_commit_object *head_commit = NULL;
4014 	struct got_reference *head_ref2 = NULL;
4015 	struct got_object_id *head_commit_id2 = NULL;
4016 	struct got_tree_object *head_tree = NULL;
4017 	struct got_object_id *new_tree_id = NULL;
4018 	struct got_object_id_queue parent_ids;
4019 	struct got_object_qid *pid = NULL;
4020 	char *logmsg = NULL;
4021 
4022 	*new_commit_id = NULL;
4023 
4024 	SIMPLEQ_INIT(&parent_ids);
4025 
4026 	err = got_object_open_as_commit(&head_commit, repo, head_commit_id);
4027 	if (err)
4028 		goto done;
4029 
4030 	err = got_object_open_as_tree(&head_tree, repo, head_commit->tree_id);
4031 	if (err)
4032 		goto done;
4033 
4034 	if (commit_msg_cb != NULL) {
4035 		err = commit_msg_cb(commitable_paths, &logmsg, commit_arg);
4036 		if (err)
4037 			goto done;
4038 	}
4039 
4040 	if (logmsg == NULL || strlen(logmsg) == 0) {
4041 		err = got_error(GOT_ERR_COMMIT_MSG_EMPTY);
4042 		goto done;
4043 	}
4044 
4045 	/* Create blobs from added and modified files and record their IDs. */
4046 	TAILQ_FOREACH(pe, commitable_paths, entry) {
4047 		struct got_commitable *ct = pe->data;
4048 		char *ondisk_path;
4049 
4050 		/* Blobs for staged files already exist. */
4051 		if (ct->staged_status == GOT_STATUS_ADD ||
4052 		    ct->staged_status == GOT_STATUS_MODIFY)
4053 			continue;
4054 
4055 		if (ct->status != GOT_STATUS_ADD &&
4056 		    ct->status != GOT_STATUS_MODIFY)
4057 			continue;
4058 
4059 		if (asprintf(&ondisk_path, "%s/%s",
4060 		    worktree->root_path, pe->path) == -1) {
4061 			err = got_error_from_errno("asprintf");
4062 			goto done;
4063 		}
4064 		err = got_object_blob_create(&ct->blob_id, ondisk_path, repo);
4065 		free(ondisk_path);
4066 		if (err)
4067 			goto done;
4068 	}
4069 
4070 	/* Recursively write new tree objects. */
4071 	err = write_tree(&new_tree_id, head_tree, "/", commitable_paths,
4072 	    status_cb, status_arg, repo);
4073 	if (err)
4074 		goto done;
4075 
4076 	err = got_object_qid_alloc(&pid, worktree->base_commit_id);
4077 	if (err)
4078 		goto done;
4079 	SIMPLEQ_INSERT_TAIL(&parent_ids, pid, entry);
4080 	err = got_object_commit_create(new_commit_id, new_tree_id, &parent_ids,
4081 	    1, author, time(NULL), committer, time(NULL), logmsg, repo);
4082 	got_object_qid_free(pid);
4083 	if (logmsg != NULL)
4084 		free(logmsg);
4085 	if (err)
4086 		goto done;
4087 
4088 	/* Check if a concurrent commit to our branch has occurred. */
4089 	head_ref_name = got_worktree_get_head_ref_name(worktree);
4090 	if (head_ref_name == NULL) {
4091 		err = got_error_from_errno("got_worktree_get_head_ref_name");
4092 		goto done;
4093 	}
4094 	/* Lock the reference here to prevent concurrent modification. */
4095 	err = got_ref_open(&head_ref2, repo, head_ref_name, 1);
4096 	if (err)
4097 		goto done;
4098 	err = got_ref_resolve(&head_commit_id2, repo, head_ref2);
4099 	if (err)
4100 		goto done;
4101 	if (got_object_id_cmp(head_commit_id, head_commit_id2) != 0) {
4102 		err = got_error(GOT_ERR_COMMIT_HEAD_CHANGED);
4103 		goto done;
4104 	}
4105 	/* Update branch head in repository. */
4106 	err = got_ref_change_ref(head_ref2, *new_commit_id);
4107 	if (err)
4108 		goto done;
4109 	err = got_ref_write(head_ref2, repo);
4110 	if (err)
4111 		goto done;
4112 
4113 	err = got_worktree_set_base_commit_id(worktree, repo, *new_commit_id);
4114 	if (err)
4115 		goto done;
4116 
4117 	err = ref_base_commit(worktree, repo);
4118 	if (err)
4119 		goto done;
4120 done:
4121 	if (head_tree)
4122 		got_object_tree_close(head_tree);
4123 	if (head_commit)
4124 		got_object_commit_close(head_commit);
4125 	free(head_commit_id2);
4126 	if (head_ref2) {
4127 		unlockerr = got_ref_unlock(head_ref2);
4128 		if (unlockerr && err == NULL)
4129 			err = unlockerr;
4130 		got_ref_close(head_ref2);
4131 	}
4132 	return err;
4133 }
4134 
4135 static const struct got_error *
4136 check_path_is_commitable(const char *path,
4137     struct got_pathlist_head *commitable_paths)
4138 {
4139 	struct got_pathlist_entry *cpe = NULL;
4140 	size_t path_len = strlen(path);
4141 
4142 	TAILQ_FOREACH(cpe, commitable_paths, entry) {
4143 		struct got_commitable *ct = cpe->data;
4144 		const char *ct_path = ct->path;
4145 
4146 		while (ct_path[0] == '/')
4147 			ct_path++;
4148 
4149 		if (strcmp(path, ct_path) == 0 ||
4150 		    got_path_is_child(ct_path, path, path_len))
4151 			break;
4152 	}
4153 
4154 	if (cpe == NULL)
4155 		return got_error_path(path, GOT_ERR_BAD_PATH);
4156 
4157 	return NULL;
4158 }
4159 
4160 static const struct got_error *
4161 check_staged_file(void *arg, struct got_fileindex_entry *ie)
4162 {
4163 	int *have_staged_files = arg;
4164 
4165 	if (got_fileindex_entry_stage_get(ie) != GOT_FILEIDX_STAGE_NONE) {
4166 		*have_staged_files = 1;
4167 		return got_error(GOT_ERR_CANCELLED);
4168 	}
4169 
4170 	return NULL;
4171 }
4172 
4173 static const struct got_error *
4174 check_non_staged_files(struct got_fileindex *fileindex,
4175     struct got_pathlist_head *paths)
4176 {
4177 	struct got_pathlist_entry *pe;
4178 	struct got_fileindex_entry *ie;
4179 
4180 	TAILQ_FOREACH(pe, paths, entry) {
4181 		if (pe->path[0] == '\0')
4182 			continue;
4183 		ie = got_fileindex_entry_get(fileindex, pe->path, pe->path_len);
4184 		if (ie == NULL)
4185 			return got_error_path(pe->path, GOT_ERR_BAD_PATH);
4186 		if (got_fileindex_entry_stage_get(ie) == GOT_FILEIDX_STAGE_NONE)
4187 			return got_error_path(pe->path,
4188 			    GOT_ERR_FILE_NOT_STAGED);
4189 	}
4190 
4191 	return NULL;
4192 }
4193 
4194 const struct got_error *
4195 got_worktree_commit(struct got_object_id **new_commit_id,
4196     struct got_worktree *worktree, struct got_pathlist_head *paths,
4197     const char *author, const char *committer,
4198     got_worktree_commit_msg_cb commit_msg_cb, void *commit_arg,
4199     got_worktree_status_cb status_cb, void *status_arg,
4200     struct got_repository *repo)
4201 {
4202 	const struct got_error *err = NULL, *unlockerr = NULL, *sync_err;
4203 	struct got_fileindex *fileindex = NULL;
4204 	char *fileindex_path = NULL;
4205 	struct got_pathlist_head commitable_paths;
4206 	struct collect_commitables_arg cc_arg;
4207 	struct got_pathlist_entry *pe;
4208 	struct got_reference *head_ref = NULL;
4209 	struct got_object_id *head_commit_id = NULL;
4210 	int have_staged_files = 0;
4211 
4212 	*new_commit_id = NULL;
4213 
4214 	TAILQ_INIT(&commitable_paths);
4215 
4216 	err = lock_worktree(worktree, LOCK_EX);
4217 	if (err)
4218 		goto done;
4219 
4220 	err = got_ref_open(&head_ref, repo, worktree->head_ref_name, 0);
4221 	if (err)
4222 		goto done;
4223 
4224 	err = got_ref_resolve(&head_commit_id, repo, head_ref);
4225 	if (err)
4226 		goto done;
4227 
4228 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
4229 	if (err)
4230 		goto done;
4231 
4232 	err = got_fileindex_for_each_entry_safe(fileindex, check_staged_file,
4233 	    &have_staged_files);
4234 	if (err && err->code != GOT_ERR_CANCELLED)
4235 		goto done;
4236 	if (have_staged_files) {
4237 		err = check_non_staged_files(fileindex, paths);
4238 		if (err)
4239 			goto done;
4240 	}
4241 
4242 	cc_arg.commitable_paths = &commitable_paths;
4243 	cc_arg.worktree = worktree;
4244 	cc_arg.repo = repo;
4245 	cc_arg.have_staged_files = have_staged_files;
4246 	TAILQ_FOREACH(pe, paths, entry) {
4247 		err = worktree_status(worktree, pe->path, fileindex, repo,
4248 		    collect_commitables, &cc_arg, NULL, NULL);
4249 		if (err)
4250 			goto done;
4251 	}
4252 
4253 	if (TAILQ_EMPTY(&commitable_paths)) {
4254 		err = got_error(GOT_ERR_COMMIT_NO_CHANGES);
4255 		goto done;
4256 	}
4257 
4258 	TAILQ_FOREACH(pe, paths, entry) {
4259 		err = check_path_is_commitable(pe->path, &commitable_paths);
4260 		if (err)
4261 			goto done;
4262 	}
4263 
4264 	TAILQ_FOREACH(pe, &commitable_paths, entry) {
4265 		struct got_commitable *ct = pe->data;
4266 		const char *ct_path = ct->in_repo_path;
4267 
4268 		while (ct_path[0] == '/')
4269 			ct_path++;
4270 		err = check_out_of_date(ct_path, ct->status,
4271 		    ct->staged_status, ct->base_blob_id, ct->base_commit_id,
4272 		    head_commit_id, repo, GOT_ERR_COMMIT_OUT_OF_DATE);
4273 		if (err)
4274 			goto done;
4275 
4276 	}
4277 
4278 	err = commit_worktree(new_commit_id, &commitable_paths,
4279 	    head_commit_id, worktree, author, committer,
4280 	    commit_msg_cb, commit_arg, status_cb, status_arg, repo);
4281 	if (err)
4282 		goto done;
4283 
4284 	err = update_fileindex_after_commit(&commitable_paths, *new_commit_id,
4285 	    fileindex);
4286 	sync_err = sync_fileindex(fileindex, fileindex_path);
4287 	if (sync_err && err == NULL)
4288 		err = sync_err;
4289 done:
4290 	if (fileindex)
4291 		got_fileindex_free(fileindex);
4292 	free(fileindex_path);
4293 	unlockerr = lock_worktree(worktree, LOCK_SH);
4294 	if (unlockerr && err == NULL)
4295 		err = unlockerr;
4296 	TAILQ_FOREACH(pe, &commitable_paths, entry) {
4297 		struct got_commitable *ct = pe->data;
4298 		free_commitable(ct);
4299 	}
4300 	got_pathlist_free(&commitable_paths);
4301 	return err;
4302 }
4303 
4304 const char *
4305 got_commitable_get_path(struct got_commitable *ct)
4306 {
4307 	return ct->path;
4308 }
4309 
4310 unsigned int
4311 got_commitable_get_status(struct got_commitable *ct)
4312 {
4313 	return ct->status;
4314 }
4315 
4316 struct check_rebase_ok_arg {
4317 	struct got_worktree *worktree;
4318 	struct got_repository *repo;
4319 };
4320 
4321 static const struct got_error *
4322 check_rebase_ok(void *arg, struct got_fileindex_entry *ie)
4323 {
4324 	const struct got_error *err = NULL;
4325 	struct check_rebase_ok_arg *a = arg;
4326 	unsigned char status;
4327 	struct stat sb;
4328 	char *ondisk_path;
4329 
4330 	/* Reject rebase of a work tree with mixed base commits. */
4331 	if (memcmp(ie->commit_sha1, a->worktree->base_commit_id->sha1,
4332 	    SHA1_DIGEST_LENGTH))
4333 		return got_error(GOT_ERR_MIXED_COMMITS);
4334 
4335 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path, ie->path)
4336 	    == -1)
4337 		return got_error_from_errno("asprintf");
4338 
4339 	/* Reject rebase of a work tree with modified or staged files. */
4340 	err = get_file_status(&status, &sb, ie, ondisk_path, a->repo);
4341 	free(ondisk_path);
4342 	if (err)
4343 		return err;
4344 
4345 	if (status != GOT_STATUS_NO_CHANGE)
4346 		return got_error(GOT_ERR_MODIFIED);
4347 	if (get_staged_status(ie) != GOT_STATUS_NO_CHANGE)
4348 		return got_error_path(ie->path, GOT_ERR_FILE_STAGED);
4349 
4350 	return NULL;
4351 }
4352 
4353 const struct got_error *
4354 got_worktree_rebase_prepare(struct got_reference **new_base_branch_ref,
4355     struct got_reference **tmp_branch, struct got_fileindex **fileindex,
4356     struct got_worktree *worktree, struct got_reference *branch,
4357     struct got_repository *repo)
4358 {
4359 	const struct got_error *err = NULL;
4360 	char *tmp_branch_name = NULL, *new_base_branch_ref_name = NULL;
4361 	char *branch_ref_name = NULL;
4362 	char *fileindex_path = NULL;
4363 	struct check_rebase_ok_arg ok_arg;
4364 	struct got_reference *wt_branch = NULL, *branch_ref = NULL;
4365 
4366 	*new_base_branch_ref = NULL;
4367 	*tmp_branch = NULL;
4368 	*fileindex = NULL;
4369 
4370 	err = lock_worktree(worktree, LOCK_EX);
4371 	if (err)
4372 		return err;
4373 
4374 	err = open_fileindex(fileindex, &fileindex_path, worktree);
4375 	if (err)
4376 		goto done;
4377 
4378 	ok_arg.worktree = worktree;
4379 	ok_arg.repo = repo;
4380 	err = got_fileindex_for_each_entry_safe(*fileindex, check_rebase_ok,
4381 	    &ok_arg);
4382 	if (err)
4383 		goto done;
4384 
4385 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
4386 	if (err)
4387 		goto done;
4388 
4389 	err = get_newbase_symref_name(&new_base_branch_ref_name, worktree);
4390 	if (err)
4391 		goto done;
4392 
4393 	err = get_rebase_branch_symref_name(&branch_ref_name, worktree);
4394 	if (err)
4395 		goto done;
4396 
4397 	err = got_ref_open(&wt_branch, repo, worktree->head_ref_name,
4398 	    0);
4399 	if (err)
4400 		goto done;
4401 
4402 	err = got_ref_alloc_symref(new_base_branch_ref,
4403 	    new_base_branch_ref_name, wt_branch);
4404 	if (err)
4405 		goto done;
4406 	err = got_ref_write(*new_base_branch_ref, repo);
4407 	if (err)
4408 		goto done;
4409 
4410 	/* TODO Lock original branch's ref while rebasing? */
4411 
4412 	err = got_ref_alloc_symref(&branch_ref, branch_ref_name, branch);
4413 	if (err)
4414 		goto done;
4415 
4416 	err = got_ref_write(branch_ref, repo);
4417 	if (err)
4418 		goto done;
4419 
4420 	err = got_ref_alloc(tmp_branch, tmp_branch_name,
4421 	    worktree->base_commit_id);
4422 	if (err)
4423 		goto done;
4424 	err = got_ref_write(*tmp_branch, repo);
4425 	if (err)
4426 		goto done;
4427 
4428 	err = got_worktree_set_head_ref(worktree, *tmp_branch);
4429 	if (err)
4430 		goto done;
4431 done:
4432 	free(fileindex_path);
4433 	free(tmp_branch_name);
4434 	free(new_base_branch_ref_name);
4435 	free(branch_ref_name);
4436 	if (branch_ref)
4437 		got_ref_close(branch_ref);
4438 	if (wt_branch)
4439 		got_ref_close(wt_branch);
4440 	if (err) {
4441 		if (*new_base_branch_ref) {
4442 			got_ref_close(*new_base_branch_ref);
4443 			*new_base_branch_ref = NULL;
4444 		}
4445 		if (*tmp_branch) {
4446 			got_ref_close(*tmp_branch);
4447 			*tmp_branch = NULL;
4448 		}
4449 		if (*fileindex) {
4450 			got_fileindex_free(*fileindex);
4451 			*fileindex = NULL;
4452 		}
4453 		lock_worktree(worktree, LOCK_SH);
4454 	}
4455 	return err;
4456 }
4457 
4458 const struct got_error *
4459 got_worktree_rebase_continue(struct got_object_id **commit_id,
4460     struct got_reference **new_base_branch, struct got_reference **tmp_branch,
4461     struct got_reference **branch, struct got_fileindex **fileindex,
4462     struct got_worktree *worktree, struct got_repository *repo)
4463 {
4464 	const struct got_error *err;
4465 	char *commit_ref_name = NULL, *new_base_branch_ref_name = NULL;
4466 	char *tmp_branch_name = NULL, *branch_ref_name = NULL;
4467 	struct got_reference *commit_ref = NULL, *branch_ref = NULL;
4468 	char *fileindex_path = NULL;
4469 	int have_staged_files = 0;
4470 
4471 	*commit_id = NULL;
4472 	*new_base_branch = NULL;
4473 	*tmp_branch = NULL;
4474 	*branch = NULL;
4475 	*fileindex = NULL;
4476 
4477 	err = lock_worktree(worktree, LOCK_EX);
4478 	if (err)
4479 		return err;
4480 
4481 	err = open_fileindex(fileindex, &fileindex_path, worktree);
4482 	if (err)
4483 		goto done;
4484 
4485 	err = got_fileindex_for_each_entry_safe(*fileindex, check_staged_file,
4486 	    &have_staged_files);
4487 	if (err && err->code != GOT_ERR_CANCELLED)
4488 		goto done;
4489 	if (have_staged_files) {
4490 		err = got_error(GOT_ERR_STAGED_PATHS);
4491 		goto done;
4492 	}
4493 
4494 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
4495 	if (err)
4496 		goto done;
4497 
4498 	err = get_rebase_branch_symref_name(&branch_ref_name, worktree);
4499 	if (err)
4500 		goto done;
4501 
4502 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
4503 	if (err)
4504 		goto done;
4505 
4506 	err = get_newbase_symref_name(&new_base_branch_ref_name, worktree);
4507 	if (err)
4508 		goto done;
4509 
4510 	err = got_ref_open(&branch_ref, repo, branch_ref_name, 0);
4511 	if (err)
4512 		goto done;
4513 
4514 	err = got_ref_open(branch, repo,
4515 	    got_ref_get_symref_target(branch_ref), 0);
4516 	if (err)
4517 		goto done;
4518 
4519 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
4520 	if (err)
4521 		goto done;
4522 
4523 	err = got_ref_resolve(commit_id, repo, commit_ref);
4524 	if (err)
4525 		goto done;
4526 
4527 	err = got_ref_open(new_base_branch, repo,
4528 	    new_base_branch_ref_name, 0);
4529 	if (err)
4530 		goto done;
4531 
4532 	err = got_ref_open(tmp_branch, repo, tmp_branch_name, 0);
4533 	if (err)
4534 		goto done;
4535 done:
4536 	free(commit_ref_name);
4537 	free(branch_ref_name);
4538 	free(fileindex_path);
4539 	if (commit_ref)
4540 		got_ref_close(commit_ref);
4541 	if (branch_ref)
4542 		got_ref_close(branch_ref);
4543 	if (err) {
4544 		free(*commit_id);
4545 		*commit_id = NULL;
4546 		if (*tmp_branch) {
4547 			got_ref_close(*tmp_branch);
4548 			*tmp_branch = NULL;
4549 		}
4550 		if (*new_base_branch) {
4551 			got_ref_close(*new_base_branch);
4552 			*new_base_branch = NULL;
4553 		}
4554 		if (*branch) {
4555 			got_ref_close(*branch);
4556 			*branch = NULL;
4557 		}
4558 		if (*fileindex) {
4559 			got_fileindex_free(*fileindex);
4560 			*fileindex = NULL;
4561 		}
4562 		lock_worktree(worktree, LOCK_SH);
4563 	}
4564 	return err;
4565 }
4566 
4567 const struct got_error *
4568 got_worktree_rebase_in_progress(int *in_progress, struct got_worktree *worktree)
4569 {
4570 	const struct got_error *err;
4571 	char *tmp_branch_name = NULL;
4572 
4573 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
4574 	if (err)
4575 		return err;
4576 
4577 	*in_progress = (strcmp(tmp_branch_name, worktree->head_ref_name) == 0);
4578 	free(tmp_branch_name);
4579 	return NULL;
4580 }
4581 
4582 static const struct got_error *
4583 collect_rebase_commit_msg(struct got_pathlist_head *commitable_paths,
4584     char **logmsg, void *arg)
4585 {
4586 	*logmsg = arg;
4587 	return NULL;
4588 }
4589 
4590 static const struct got_error *
4591 rebase_status(void *arg, unsigned char status, unsigned char staged_status,
4592     const char *path, struct got_object_id *blob_id,
4593     struct got_object_id *staged_blob_id, struct got_object_id *commit_id)
4594 {
4595 	return NULL;
4596 }
4597 
4598 struct collect_merged_paths_arg {
4599 	got_worktree_checkout_cb progress_cb;
4600 	void *progress_arg;
4601 	struct got_pathlist_head *merged_paths;
4602 };
4603 
4604 static const struct got_error *
4605 collect_merged_paths(void *arg, unsigned char status, const char *path)
4606 {
4607 	const struct got_error *err;
4608 	struct collect_merged_paths_arg *a = arg;
4609 	char *p;
4610 	struct got_pathlist_entry *new;
4611 
4612 	err = (*a->progress_cb)(a->progress_arg, status, path);
4613 	if (err)
4614 		return err;
4615 
4616 	if (status != GOT_STATUS_MERGE &&
4617 	    status != GOT_STATUS_ADD &&
4618 	    status != GOT_STATUS_DELETE &&
4619 	    status != GOT_STATUS_CONFLICT)
4620 		return NULL;
4621 
4622 	p = strdup(path);
4623 	if (p == NULL)
4624 		return got_error_from_errno("strdup");
4625 
4626 	err = got_pathlist_insert(&new, a->merged_paths, p, NULL);
4627 	if (err || new == NULL)
4628 		free(p);
4629 	return err;
4630 }
4631 
4632 void
4633 got_worktree_rebase_pathlist_free(struct got_pathlist_head *merged_paths)
4634 {
4635 	struct got_pathlist_entry *pe;
4636 
4637 	TAILQ_FOREACH(pe, merged_paths, entry)
4638 		free((char *)pe->path);
4639 
4640 	got_pathlist_free(merged_paths);
4641 }
4642 
4643 static const struct got_error *
4644 store_commit_id(const char *commit_ref_name, struct got_object_id *commit_id,
4645     struct got_repository *repo)
4646 {
4647 	const struct got_error *err;
4648 	struct got_reference *commit_ref = NULL;
4649 
4650 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
4651 	if (err) {
4652 		if (err->code != GOT_ERR_NOT_REF)
4653 			goto done;
4654 		err = got_ref_alloc(&commit_ref, commit_ref_name, commit_id);
4655 		if (err)
4656 			goto done;
4657 		err = got_ref_write(commit_ref, repo);
4658 		if (err)
4659 			goto done;
4660 	} else {
4661 		struct got_object_id *stored_id;
4662 		int cmp;
4663 
4664 		err = got_ref_resolve(&stored_id, repo, commit_ref);
4665 		if (err)
4666 			goto done;
4667 		cmp = got_object_id_cmp(commit_id, stored_id);
4668 		free(stored_id);
4669 		if (cmp != 0) {
4670 			err = got_error(GOT_ERR_REBASE_COMMITID);
4671 			goto done;
4672 		}
4673 	}
4674 done:
4675 	if (commit_ref)
4676 		got_ref_close(commit_ref);
4677 	return err;
4678 }
4679 
4680 static const struct got_error *
4681 rebase_merge_files(struct got_pathlist_head *merged_paths,
4682     const char *commit_ref_name, struct got_worktree *worktree,
4683     struct got_fileindex *fileindex, struct got_object_id *parent_commit_id,
4684     struct got_object_id *commit_id, struct got_repository *repo,
4685     got_worktree_checkout_cb progress_cb, void *progress_arg,
4686     got_cancel_cb cancel_cb, void *cancel_arg)
4687 {
4688 	const struct got_error *err;
4689 	struct got_reference *commit_ref = NULL;
4690 	struct collect_merged_paths_arg cmp_arg;
4691 	char *fileindex_path;
4692 
4693 	/* Work tree is locked/unlocked during rebase preparation/teardown. */
4694 
4695 	err = get_fileindex_path(&fileindex_path, worktree);
4696 	if (err)
4697 		return err;
4698 
4699 	cmp_arg.progress_cb = progress_cb;
4700 	cmp_arg.progress_arg = progress_arg;
4701 	cmp_arg.merged_paths = merged_paths;
4702 	err = merge_files(worktree, fileindex, fileindex_path,
4703 	    parent_commit_id, commit_id, repo, collect_merged_paths,
4704 	    &cmp_arg, cancel_cb, cancel_arg);
4705 	if (commit_ref)
4706 		got_ref_close(commit_ref);
4707 	return err;
4708 }
4709 
4710 const struct got_error *
4711 got_worktree_rebase_merge_files(struct got_pathlist_head *merged_paths,
4712     struct got_worktree *worktree, struct got_fileindex *fileindex,
4713     struct got_object_id *parent_commit_id, struct got_object_id *commit_id,
4714     struct got_repository *repo,
4715     got_worktree_checkout_cb progress_cb, void *progress_arg,
4716     got_cancel_cb cancel_cb, void *cancel_arg)
4717 {
4718 	const struct got_error *err;
4719 	char *commit_ref_name;
4720 
4721 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
4722 	if (err)
4723 		return err;
4724 
4725 	err = store_commit_id(commit_ref_name, commit_id, repo);
4726 	if (err)
4727 		goto done;
4728 
4729 	err = rebase_merge_files(merged_paths, commit_ref_name, worktree,
4730 	    fileindex, parent_commit_id, commit_id, repo, progress_cb,
4731 	    progress_arg, cancel_cb, cancel_arg);
4732 done:
4733 	free(commit_ref_name);
4734 	return err;
4735 }
4736 
4737 const struct got_error *
4738 got_worktree_histedit_merge_files(struct got_pathlist_head *merged_paths,
4739     struct got_worktree *worktree, struct got_fileindex *fileindex,
4740     struct got_object_id *parent_commit_id, struct got_object_id *commit_id,
4741     struct got_repository *repo,
4742     got_worktree_checkout_cb progress_cb, void *progress_arg,
4743     got_cancel_cb cancel_cb, void *cancel_arg)
4744 {
4745 	const struct got_error *err;
4746 	char *commit_ref_name;
4747 
4748 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
4749 	if (err)
4750 		return err;
4751 
4752 	err = store_commit_id(commit_ref_name, commit_id, repo);
4753 	if (err)
4754 		goto done;
4755 
4756 	err = rebase_merge_files(merged_paths, commit_ref_name, worktree,
4757 	    fileindex, parent_commit_id, commit_id, repo, progress_cb,
4758 	    progress_arg, cancel_cb, cancel_arg);
4759 done:
4760 	free(commit_ref_name);
4761 	return err;
4762 }
4763 
4764 static const struct got_error *
4765 rebase_commit(struct got_object_id **new_commit_id,
4766     struct got_pathlist_head *merged_paths, struct got_reference *commit_ref,
4767     struct got_worktree *worktree, struct got_fileindex *fileindex,
4768     struct got_reference *tmp_branch, struct got_commit_object *orig_commit,
4769     const char *new_logmsg, struct got_repository *repo)
4770 {
4771 	const struct got_error *err, *sync_err;
4772 	struct got_pathlist_head commitable_paths;
4773 	struct collect_commitables_arg cc_arg;
4774 	char *fileindex_path = NULL;
4775 	struct got_reference *head_ref = NULL;
4776 	struct got_object_id *head_commit_id = NULL;
4777 	char *logmsg = NULL;
4778 
4779 	TAILQ_INIT(&commitable_paths);
4780 	*new_commit_id = NULL;
4781 
4782 	/* Work tree is locked/unlocked during rebase preparation/teardown. */
4783 
4784 	err = get_fileindex_path(&fileindex_path, worktree);
4785 	if (err)
4786 		return err;
4787 
4788 	cc_arg.commitable_paths = &commitable_paths;
4789 	cc_arg.worktree = worktree;
4790 	cc_arg.repo = repo;
4791 	cc_arg.have_staged_files = 0;
4792 	/*
4793 	 * If possible get the status of individual files directly to
4794 	 * avoid crawling the entire work tree once per rebased commit.
4795 	 * TODO: Ideally, merged_paths would contain a list of commitables
4796 	 * we could use so we could skip worktree_status() entirely.
4797 	 */
4798 	if (merged_paths) {
4799 		struct got_pathlist_entry *pe;
4800 		if (TAILQ_EMPTY(merged_paths)) {
4801 			err = got_error(GOT_ERR_NO_MERGED_PATHS);
4802 			goto done;
4803 		}
4804 		TAILQ_FOREACH(pe, merged_paths, entry) {
4805 			err = worktree_status(worktree, pe->path, fileindex,
4806 			    repo, collect_commitables, &cc_arg, NULL, NULL);
4807 			if (err)
4808 				goto done;
4809 		}
4810 	} else {
4811 		err = worktree_status(worktree, "", fileindex, repo,
4812 		    collect_commitables, &cc_arg, NULL, NULL);
4813 		if (err)
4814 			goto done;
4815 	}
4816 
4817 	if (TAILQ_EMPTY(&commitable_paths)) {
4818 		/* No-op change; commit will be elided. */
4819 		err = got_ref_delete(commit_ref, repo);
4820 		if (err)
4821 			goto done;
4822 		err = got_error(GOT_ERR_COMMIT_NO_CHANGES);
4823 		goto done;
4824 	}
4825 
4826 	err = got_ref_open(&head_ref, repo, worktree->head_ref_name, 0);
4827 	if (err)
4828 		goto done;
4829 
4830 	err = got_ref_resolve(&head_commit_id, repo, head_ref);
4831 	if (err)
4832 		goto done;
4833 
4834 	if (new_logmsg) {
4835 		logmsg = strdup(new_logmsg);
4836 		if (logmsg == NULL) {
4837 			err = got_error_from_errno("strdup");
4838 			goto done;
4839 		}
4840 	} else {
4841 		err = got_object_commit_get_logmsg(&logmsg, orig_commit);
4842 		if (err)
4843 			goto done;
4844 	}
4845 
4846 	/* NB: commit_worktree will call free(logmsg) */
4847 	err = commit_worktree(new_commit_id, &commitable_paths, head_commit_id,
4848 	    worktree, got_object_commit_get_author(orig_commit),
4849 	    got_object_commit_get_committer(orig_commit),
4850 	    collect_rebase_commit_msg, logmsg, rebase_status, NULL, repo);
4851 	if (err)
4852 		goto done;
4853 
4854 	err = got_ref_change_ref(tmp_branch, *new_commit_id);
4855 	if (err)
4856 		goto done;
4857 
4858 	err = got_ref_delete(commit_ref, repo);
4859 	if (err)
4860 		goto done;
4861 
4862 	err = update_fileindex_after_commit(&commitable_paths, *new_commit_id,
4863 	    fileindex);
4864 	sync_err = sync_fileindex(fileindex, fileindex_path);
4865 	if (sync_err && err == NULL)
4866 		err = sync_err;
4867 done:
4868 	free(fileindex_path);
4869 	free(head_commit_id);
4870 	if (head_ref)
4871 		got_ref_close(head_ref);
4872 	if (err) {
4873 		free(*new_commit_id);
4874 		*new_commit_id = NULL;
4875 	}
4876 	return err;
4877 }
4878 
4879 const struct got_error *
4880 got_worktree_rebase_commit(struct got_object_id **new_commit_id,
4881     struct got_pathlist_head *merged_paths, struct got_worktree *worktree,
4882     struct got_fileindex *fileindex, struct got_reference *tmp_branch,
4883     struct got_commit_object *orig_commit,
4884     struct got_object_id *orig_commit_id, struct got_repository *repo)
4885 {
4886 	const struct got_error *err;
4887 	char *commit_ref_name;
4888 	struct got_reference *commit_ref = NULL;
4889 	struct got_object_id *commit_id = NULL;
4890 
4891 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
4892 	if (err)
4893 		return err;
4894 
4895 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
4896 	if (err)
4897 		goto done;
4898 	err = got_ref_resolve(&commit_id, repo, commit_ref);
4899 	if (err)
4900 		goto done;
4901 	if (got_object_id_cmp(commit_id, orig_commit_id) != 0) {
4902 		err = got_error(GOT_ERR_REBASE_COMMITID);
4903 		goto done;
4904 	}
4905 
4906 	err = rebase_commit(new_commit_id, merged_paths, commit_ref,
4907 	    worktree, fileindex, tmp_branch, orig_commit, NULL, repo);
4908 done:
4909 	if (commit_ref)
4910 		got_ref_close(commit_ref);
4911 	free(commit_ref_name);
4912 	free(commit_id);
4913 	return err;
4914 }
4915 
4916 const struct got_error *
4917 got_worktree_histedit_commit(struct got_object_id **new_commit_id,
4918     struct got_pathlist_head *merged_paths, struct got_worktree *worktree,
4919     struct got_fileindex *fileindex, struct got_reference *tmp_branch,
4920     struct got_commit_object *orig_commit,
4921     struct got_object_id *orig_commit_id, const char *new_logmsg,
4922     struct got_repository *repo)
4923 {
4924 	const struct got_error *err;
4925 	char *commit_ref_name;
4926 	struct got_reference *commit_ref = NULL;
4927 	struct got_object_id *commit_id = NULL;
4928 
4929 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
4930 	if (err)
4931 		return err;
4932 
4933 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
4934 	if (err)
4935 		goto done;
4936 	err = got_ref_resolve(&commit_id, repo, commit_ref);
4937 	if (err)
4938 		goto done;
4939 	if (got_object_id_cmp(commit_id, orig_commit_id) != 0) {
4940 		err = got_error(GOT_ERR_HISTEDIT_COMMITID);
4941 		goto done;
4942 	}
4943 
4944 	err = rebase_commit(new_commit_id, merged_paths, commit_ref,
4945 	    worktree, fileindex, tmp_branch, orig_commit, new_logmsg, repo);
4946 done:
4947 	if (commit_ref)
4948 		got_ref_close(commit_ref);
4949 	free(commit_ref_name);
4950 	free(commit_id);
4951 	return err;
4952 }
4953 
4954 const struct got_error *
4955 got_worktree_rebase_postpone(struct got_worktree *worktree,
4956     struct got_fileindex *fileindex)
4957 {
4958 	if (fileindex)
4959 		got_fileindex_free(fileindex);
4960 	return lock_worktree(worktree, LOCK_SH);
4961 }
4962 
4963 static const struct got_error *
4964 delete_ref(const char *name, struct got_repository *repo)
4965 {
4966 	const struct got_error *err;
4967 	struct got_reference *ref;
4968 
4969 	err = got_ref_open(&ref, repo, name, 0);
4970 	if (err) {
4971 		if (err->code == GOT_ERR_NOT_REF)
4972 			return NULL;
4973 		return err;
4974 	}
4975 
4976 	err = got_ref_delete(ref, repo);
4977 	got_ref_close(ref);
4978 	return err;
4979 }
4980 
4981 static const struct got_error *
4982 delete_rebase_refs(struct got_worktree *worktree, struct got_repository *repo)
4983 {
4984 	const struct got_error *err;
4985 	char *tmp_branch_name = NULL, *new_base_branch_ref_name = NULL;
4986 	char *branch_ref_name = NULL, *commit_ref_name = NULL;
4987 
4988 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
4989 	if (err)
4990 		goto done;
4991 	err = delete_ref(tmp_branch_name, repo);
4992 	if (err)
4993 		goto done;
4994 
4995 	err = get_newbase_symref_name(&new_base_branch_ref_name, worktree);
4996 	if (err)
4997 		goto done;
4998 	err = delete_ref(new_base_branch_ref_name, repo);
4999 	if (err)
5000 		goto done;
5001 
5002 	err = get_rebase_branch_symref_name(&branch_ref_name, worktree);
5003 	if (err)
5004 		goto done;
5005 	err = delete_ref(branch_ref_name, repo);
5006 	if (err)
5007 		goto done;
5008 
5009 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
5010 	if (err)
5011 		goto done;
5012 	err = delete_ref(commit_ref_name, repo);
5013 	if (err)
5014 		goto done;
5015 
5016 done:
5017 	free(tmp_branch_name);
5018 	free(new_base_branch_ref_name);
5019 	free(branch_ref_name);
5020 	free(commit_ref_name);
5021 	return err;
5022 }
5023 
5024 const struct got_error *
5025 got_worktree_rebase_complete(struct got_worktree *worktree,
5026     struct got_fileindex *fileindex, struct got_reference *new_base_branch,
5027     struct got_reference *tmp_branch, struct got_reference *rebased_branch,
5028     struct got_repository *repo)
5029 {
5030 	const struct got_error *err, *unlockerr;
5031 	struct got_object_id *new_head_commit_id = NULL;
5032 
5033 	err = got_ref_resolve(&new_head_commit_id, repo, tmp_branch);
5034 	if (err)
5035 		return err;
5036 
5037 	err = got_ref_change_ref(rebased_branch, new_head_commit_id);
5038 	if (err)
5039 		goto done;
5040 
5041 	err = got_ref_write(rebased_branch, repo);
5042 	if (err)
5043 		goto done;
5044 
5045 	err = got_worktree_set_head_ref(worktree, rebased_branch);
5046 	if (err)
5047 		goto done;
5048 
5049 	err = delete_rebase_refs(worktree, repo);
5050 done:
5051 	if (fileindex)
5052 		got_fileindex_free(fileindex);
5053 	free(new_head_commit_id);
5054 	unlockerr = lock_worktree(worktree, LOCK_SH);
5055 	if (unlockerr && err == NULL)
5056 		err = unlockerr;
5057 	return err;
5058 }
5059 
5060 const struct got_error *
5061 got_worktree_rebase_abort(struct got_worktree *worktree,
5062     struct got_fileindex *fileindex, struct got_repository *repo,
5063     struct got_reference *new_base_branch,
5064      got_worktree_checkout_cb progress_cb, void *progress_arg)
5065 {
5066 	const struct got_error *err, *unlockerr, *sync_err;
5067 	struct got_reference *resolved = NULL;
5068 	struct got_object_id *commit_id = NULL;
5069 	char *fileindex_path = NULL;
5070 	struct revert_file_args rfa;
5071 	struct got_object_id *tree_id = NULL;
5072 
5073 	err = lock_worktree(worktree, LOCK_EX);
5074 	if (err)
5075 		return err;
5076 
5077 	err = got_ref_open(&resolved, repo,
5078 	    got_ref_get_symref_target(new_base_branch), 0);
5079 	if (err)
5080 		goto done;
5081 
5082 	err = got_worktree_set_head_ref(worktree, resolved);
5083 	if (err)
5084 		goto done;
5085 
5086 	/*
5087 	 * XXX commits to the base branch could have happened while
5088 	 * we were busy rebasing; should we store the original commit ID
5089 	 * when rebase begins and read it back here?
5090 	 */
5091 	err = got_ref_resolve(&commit_id, repo, resolved);
5092 	if (err)
5093 		goto done;
5094 
5095 	err = got_worktree_set_base_commit_id(worktree, repo, commit_id);
5096 	if (err)
5097 		goto done;
5098 
5099 	err = got_object_id_by_path(&tree_id, repo,
5100 	    worktree->base_commit_id, worktree->path_prefix);
5101 	if (err)
5102 		goto done;
5103 
5104 	err = delete_rebase_refs(worktree, repo);
5105 	if (err)
5106 		goto done;
5107 
5108 	err = get_fileindex_path(&fileindex_path, worktree);
5109 	if (err)
5110 		goto done;
5111 
5112 	rfa.worktree = worktree;
5113 	rfa.fileindex = fileindex;
5114 	rfa.progress_cb = progress_cb;
5115 	rfa.progress_arg = progress_arg;
5116 	rfa.patch_cb = NULL;
5117 	rfa.patch_arg = NULL;
5118 	rfa.repo = repo;
5119 	err = worktree_status(worktree, "", fileindex, repo,
5120 	    revert_file, &rfa, NULL, NULL);
5121 	if (err)
5122 		goto sync;
5123 
5124 	err = checkout_files(worktree, fileindex, "", tree_id, NULL,
5125 	    repo, progress_cb, progress_arg, NULL, NULL);
5126 sync:
5127 	sync_err = sync_fileindex(fileindex, fileindex_path);
5128 	if (sync_err && err == NULL)
5129 		err = sync_err;
5130 done:
5131 	got_ref_close(resolved);
5132 	free(tree_id);
5133 	free(commit_id);
5134 	if (fileindex)
5135 		got_fileindex_free(fileindex);
5136 	free(fileindex_path);
5137 
5138 	unlockerr = lock_worktree(worktree, LOCK_SH);
5139 	if (unlockerr && err == NULL)
5140 		err = unlockerr;
5141 	return err;
5142 }
5143 
5144 const struct got_error *
5145 got_worktree_histedit_prepare(struct got_reference **tmp_branch,
5146     struct got_reference **branch_ref, struct got_object_id **base_commit_id,
5147     struct got_fileindex **fileindex, struct got_worktree *worktree,
5148     struct got_repository *repo)
5149 {
5150 	const struct got_error *err = NULL;
5151 	char *tmp_branch_name = NULL;
5152 	char *branch_ref_name = NULL;
5153 	char *base_commit_ref_name = NULL;
5154 	char *fileindex_path = NULL;
5155 	struct check_rebase_ok_arg ok_arg;
5156 	struct got_reference *wt_branch = NULL;
5157 	struct got_reference *base_commit_ref = NULL;
5158 
5159 	*tmp_branch = NULL;
5160 	*branch_ref = NULL;
5161 	*base_commit_id = NULL;
5162 	*fileindex = NULL;
5163 
5164 	err = lock_worktree(worktree, LOCK_EX);
5165 	if (err)
5166 		return err;
5167 
5168 	err = open_fileindex(fileindex, &fileindex_path, worktree);
5169 	if (err)
5170 		goto done;
5171 
5172 	ok_arg.worktree = worktree;
5173 	ok_arg.repo = repo;
5174 	err = got_fileindex_for_each_entry_safe(*fileindex, check_rebase_ok,
5175 	    &ok_arg);
5176 	if (err)
5177 		goto done;
5178 
5179 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
5180 	if (err)
5181 		goto done;
5182 
5183 	err = get_histedit_branch_symref_name(&branch_ref_name, worktree);
5184 	if (err)
5185 		goto done;
5186 
5187 	err = get_histedit_base_commit_ref_name(&base_commit_ref_name,
5188 	    worktree);
5189 	if (err)
5190 		goto done;
5191 
5192 	err = got_ref_open(&wt_branch, repo, worktree->head_ref_name,
5193 	    0);
5194 	if (err)
5195 		goto done;
5196 
5197 	err = got_ref_alloc_symref(branch_ref, branch_ref_name, wt_branch);
5198 	if (err)
5199 		goto done;
5200 
5201 	err = got_ref_write(*branch_ref, repo);
5202 	if (err)
5203 		goto done;
5204 
5205 	err = got_ref_alloc(&base_commit_ref, base_commit_ref_name,
5206 	    worktree->base_commit_id);
5207 	if (err)
5208 		goto done;
5209 	err = got_ref_write(base_commit_ref, repo);
5210 	if (err)
5211 		goto done;
5212 	*base_commit_id = got_object_id_dup(worktree->base_commit_id);
5213 	if (*base_commit_id == NULL) {
5214 		err = got_error_from_errno("got_object_id_dup");
5215 		goto done;
5216 	}
5217 
5218 	err = got_ref_alloc(tmp_branch, tmp_branch_name,
5219 	    worktree->base_commit_id);
5220 	if (err)
5221 		goto done;
5222 	err = got_ref_write(*tmp_branch, repo);
5223 	if (err)
5224 		goto done;
5225 
5226 	err = got_worktree_set_head_ref(worktree, *tmp_branch);
5227 	if (err)
5228 		goto done;
5229 done:
5230 	free(fileindex_path);
5231 	free(tmp_branch_name);
5232 	free(branch_ref_name);
5233 	free(base_commit_ref_name);
5234 	if (wt_branch)
5235 		got_ref_close(wt_branch);
5236 	if (err) {
5237 		if (*branch_ref) {
5238 			got_ref_close(*branch_ref);
5239 			*branch_ref = NULL;
5240 		}
5241 		if (*tmp_branch) {
5242 			got_ref_close(*tmp_branch);
5243 			*tmp_branch = NULL;
5244 		}
5245 		free(*base_commit_id);
5246 		if (*fileindex) {
5247 			got_fileindex_free(*fileindex);
5248 			*fileindex = NULL;
5249 		}
5250 		lock_worktree(worktree, LOCK_SH);
5251 	}
5252 	return err;
5253 }
5254 
5255 const struct got_error *
5256 got_worktree_histedit_postpone(struct got_worktree *worktree,
5257     struct got_fileindex *fileindex)
5258 {
5259 	if (fileindex)
5260 		got_fileindex_free(fileindex);
5261 	return lock_worktree(worktree, LOCK_SH);
5262 }
5263 
5264 const struct got_error *
5265 got_worktree_histedit_in_progress(int *in_progress,
5266     struct got_worktree *worktree)
5267 {
5268 	const struct got_error *err;
5269 	char *tmp_branch_name = NULL;
5270 
5271 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
5272 	if (err)
5273 		return err;
5274 
5275 	*in_progress = (strcmp(tmp_branch_name, worktree->head_ref_name) == 0);
5276 	free(tmp_branch_name);
5277 	return NULL;
5278 }
5279 
5280 const struct got_error *
5281 got_worktree_histedit_continue(struct got_object_id **commit_id,
5282     struct got_reference **tmp_branch, struct got_reference **branch_ref,
5283     struct got_object_id **base_commit_id, struct got_fileindex **fileindex,
5284     struct got_worktree *worktree, struct got_repository *repo)
5285 {
5286 	const struct got_error *err;
5287 	char *commit_ref_name = NULL, *base_commit_ref_name = NULL;
5288 	char *tmp_branch_name = NULL, *branch_ref_name = NULL;
5289 	struct got_reference *commit_ref = NULL;
5290 	struct got_reference *base_commit_ref = NULL;
5291 	char *fileindex_path = NULL;
5292 	int have_staged_files = 0;
5293 
5294 	*commit_id = NULL;
5295 	*tmp_branch = NULL;
5296 	*base_commit_id = NULL;
5297 	*fileindex = NULL;
5298 
5299 	err = lock_worktree(worktree, LOCK_EX);
5300 	if (err)
5301 		return err;
5302 
5303 	err = open_fileindex(fileindex, &fileindex_path, worktree);
5304 	if (err)
5305 		goto done;
5306 
5307 	err = got_fileindex_for_each_entry_safe(*fileindex, check_staged_file,
5308 	    &have_staged_files);
5309 	if (err && err->code != GOT_ERR_CANCELLED)
5310 		goto done;
5311 	if (have_staged_files) {
5312 		err = got_error(GOT_ERR_STAGED_PATHS);
5313 		goto done;
5314 	}
5315 
5316 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
5317 	if (err)
5318 		goto done;
5319 
5320 	err = get_histedit_branch_symref_name(&branch_ref_name, worktree);
5321 	if (err)
5322 		goto done;
5323 
5324 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
5325 	if (err)
5326 		goto done;
5327 
5328 	err = get_histedit_base_commit_ref_name(&base_commit_ref_name,
5329 	    worktree);
5330 	if (err)
5331 		goto done;
5332 
5333 	err = got_ref_open(branch_ref, repo, branch_ref_name, 0);
5334 	if (err)
5335 		goto done;
5336 
5337 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
5338 	if (err)
5339 		goto done;
5340 	err = got_ref_resolve(commit_id, repo, commit_ref);
5341 	if (err)
5342 		goto done;
5343 
5344 	err = got_ref_open(&base_commit_ref, repo, base_commit_ref_name, 0);
5345 	if (err)
5346 		goto done;
5347 	err = got_ref_resolve(base_commit_id, repo, base_commit_ref);
5348 	if (err)
5349 		goto done;
5350 
5351 	err = got_ref_open(tmp_branch, repo, tmp_branch_name, 0);
5352 	if (err)
5353 		goto done;
5354 done:
5355 	free(commit_ref_name);
5356 	free(branch_ref_name);
5357 	free(fileindex_path);
5358 	if (commit_ref)
5359 		got_ref_close(commit_ref);
5360 	if (base_commit_ref)
5361 		got_ref_close(base_commit_ref);
5362 	if (err) {
5363 		free(*commit_id);
5364 		*commit_id = NULL;
5365 		free(*base_commit_id);
5366 		*base_commit_id = NULL;
5367 		if (*tmp_branch) {
5368 			got_ref_close(*tmp_branch);
5369 			*tmp_branch = NULL;
5370 		}
5371 		if (*fileindex) {
5372 			got_fileindex_free(*fileindex);
5373 			*fileindex = NULL;
5374 		}
5375 		lock_worktree(worktree, LOCK_EX);
5376 	}
5377 	return err;
5378 }
5379 
5380 static const struct got_error *
5381 delete_histedit_refs(struct got_worktree *worktree, struct got_repository *repo)
5382 {
5383 	const struct got_error *err;
5384 	char *tmp_branch_name = NULL, *base_commit_ref_name = NULL;
5385 	char *branch_ref_name = NULL, *commit_ref_name = NULL;
5386 
5387 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
5388 	if (err)
5389 		goto done;
5390 	err = delete_ref(tmp_branch_name, repo);
5391 	if (err)
5392 		goto done;
5393 
5394 	err = get_histedit_base_commit_ref_name(&base_commit_ref_name,
5395 	    worktree);
5396 	if (err)
5397 		goto done;
5398 	err = delete_ref(base_commit_ref_name, repo);
5399 	if (err)
5400 		goto done;
5401 
5402 	err = get_histedit_branch_symref_name(&branch_ref_name, worktree);
5403 	if (err)
5404 		goto done;
5405 	err = delete_ref(branch_ref_name, repo);
5406 	if (err)
5407 		goto done;
5408 
5409 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
5410 	if (err)
5411 		goto done;
5412 	err = delete_ref(commit_ref_name, repo);
5413 	if (err)
5414 		goto done;
5415 done:
5416 	free(tmp_branch_name);
5417 	free(base_commit_ref_name);
5418 	free(branch_ref_name);
5419 	free(commit_ref_name);
5420 	return err;
5421 }
5422 
5423 const struct got_error *
5424 got_worktree_histedit_abort(struct got_worktree *worktree,
5425     struct got_fileindex *fileindex, struct got_repository *repo,
5426     struct got_reference *branch, struct got_object_id *base_commit_id,
5427     got_worktree_checkout_cb progress_cb, void *progress_arg)
5428 {
5429 	const struct got_error *err, *unlockerr, *sync_err;
5430 	struct got_reference *resolved = NULL;
5431 	char *fileindex_path = NULL;
5432 	struct got_object_id *tree_id = NULL;
5433 	struct revert_file_args rfa;
5434 
5435 	err = lock_worktree(worktree, LOCK_EX);
5436 	if (err)
5437 		return err;
5438 
5439 	err = got_ref_open(&resolved, repo,
5440 	    got_ref_get_symref_target(branch), 0);
5441 	if (err)
5442 		goto done;
5443 
5444 	err = got_worktree_set_head_ref(worktree, resolved);
5445 	if (err)
5446 		goto done;
5447 
5448 	err = got_worktree_set_base_commit_id(worktree, repo, base_commit_id);
5449 	if (err)
5450 		goto done;
5451 
5452 	err = got_object_id_by_path(&tree_id, repo, base_commit_id,
5453 	    worktree->path_prefix);
5454 	if (err)
5455 		goto done;
5456 
5457 	err = delete_histedit_refs(worktree, repo);
5458 	if (err)
5459 		goto done;
5460 
5461 	err = get_fileindex_path(&fileindex_path, worktree);
5462 	if (err)
5463 		goto done;
5464 
5465 	rfa.worktree = worktree;
5466 	rfa.fileindex = fileindex;
5467 	rfa.progress_cb = progress_cb;
5468 	rfa.progress_arg = progress_arg;
5469 	rfa.patch_cb = NULL;
5470 	rfa.patch_arg = NULL;
5471 	rfa.repo = repo;
5472 	err = worktree_status(worktree, "", fileindex, repo,
5473 	    revert_file, &rfa, NULL, NULL);
5474 	if (err)
5475 		goto sync;
5476 
5477 	err = checkout_files(worktree, fileindex, "", tree_id, NULL,
5478 	    repo, progress_cb, progress_arg, NULL, NULL);
5479 sync:
5480 	sync_err = sync_fileindex(fileindex, fileindex_path);
5481 	if (sync_err && err == NULL)
5482 		err = sync_err;
5483 done:
5484 	got_ref_close(resolved);
5485 	free(tree_id);
5486 	free(fileindex_path);
5487 
5488 	unlockerr = lock_worktree(worktree, LOCK_SH);
5489 	if (unlockerr && err == NULL)
5490 		err = unlockerr;
5491 	return err;
5492 }
5493 
5494 const struct got_error *
5495 got_worktree_histedit_complete(struct got_worktree *worktree,
5496     struct got_fileindex *fileindex, struct got_reference *tmp_branch,
5497     struct got_reference *edited_branch, struct got_repository *repo)
5498 {
5499 	const struct got_error *err, *unlockerr;
5500 	struct got_object_id *new_head_commit_id = NULL;
5501 	struct got_reference *resolved = NULL;
5502 
5503 	err = got_ref_resolve(&new_head_commit_id, repo, tmp_branch);
5504 	if (err)
5505 		return err;
5506 
5507 	err = got_ref_open(&resolved, repo,
5508 	    got_ref_get_symref_target(edited_branch), 0);
5509 	if (err)
5510 		goto done;
5511 
5512 	err = got_ref_change_ref(resolved, new_head_commit_id);
5513 	if (err)
5514 		goto done;
5515 
5516 	err = got_ref_write(resolved, repo);
5517 	if (err)
5518 		goto done;
5519 
5520 	err = got_worktree_set_head_ref(worktree, resolved);
5521 	if (err)
5522 		goto done;
5523 
5524 	err = delete_histedit_refs(worktree, repo);
5525 done:
5526 	if (fileindex)
5527 		got_fileindex_free(fileindex);
5528 	free(new_head_commit_id);
5529 	unlockerr = lock_worktree(worktree, LOCK_SH);
5530 	if (unlockerr && err == NULL)
5531 		err = unlockerr;
5532 	return err;
5533 }
5534 
5535 const struct got_error *
5536 got_worktree_histedit_skip_commit(struct got_worktree *worktree,
5537     struct got_object_id *commit_id, struct got_repository *repo)
5538 {
5539 	const struct got_error *err;
5540 	char *commit_ref_name;
5541 
5542 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
5543 	if (err)
5544 		return err;
5545 
5546 	err = store_commit_id(commit_ref_name, commit_id, repo);
5547 	if (err)
5548 		goto done;
5549 
5550 	err = delete_ref(commit_ref_name, repo);
5551 done:
5552 	free(commit_ref_name);
5553 	return err;
5554 }
5555 
5556 struct check_stage_ok_arg {
5557 	struct got_object_id *head_commit_id;
5558 	struct got_worktree *worktree;
5559 	struct got_fileindex *fileindex;
5560 	struct got_repository *repo;
5561 	int have_changes;
5562 };
5563 
5564 const struct got_error *
5565 check_stage_ok(void *arg, unsigned char status,
5566     unsigned char staged_status, const char *relpath,
5567     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
5568     struct got_object_id *commit_id)
5569 {
5570 	struct check_stage_ok_arg *a = arg;
5571 	const struct got_error *err = NULL;
5572 	struct got_fileindex_entry *ie;
5573 	struct got_object_id base_commit_id;
5574 	struct got_object_id *base_commit_idp = NULL;
5575 	char *in_repo_path = NULL, *p;
5576 
5577 	if (status == GOT_STATUS_UNVERSIONED)
5578 		return NULL;
5579 	if (status == GOT_STATUS_NONEXISTENT)
5580 		return got_error_set_errno(ENOENT, relpath);
5581 
5582 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
5583 	if (ie == NULL)
5584 		return got_error_path(relpath, GOT_ERR_FILE_STATUS);
5585 
5586 	if (asprintf(&in_repo_path, "%s%s%s", a->worktree->path_prefix,
5587 	    got_path_is_root_dir(a->worktree->path_prefix) ? "" : "/",
5588 	    relpath) == -1)
5589 		return got_error_from_errno("asprintf");
5590 
5591 	if (got_fileindex_entry_has_commit(ie)) {
5592 		memcpy(base_commit_id.sha1, ie->commit_sha1,
5593 		    SHA1_DIGEST_LENGTH);
5594 		base_commit_idp = &base_commit_id;
5595 	}
5596 
5597 	if (status == GOT_STATUS_NO_CHANGE) {
5598 		err = got_error_path(ie->path, GOT_ERR_STAGE_NO_CHANGE);
5599 		goto done;
5600 	} else if (status == GOT_STATUS_CONFLICT) {
5601 		err = got_error_path(ie->path, GOT_ERR_STAGE_CONFLICT);
5602 		goto done;
5603 	} else if (status != GOT_STATUS_ADD &&
5604 	    status != GOT_STATUS_MODIFY &&
5605 	    status != GOT_STATUS_DELETE) {
5606 		err = got_error_path(ie->path, GOT_ERR_FILE_STATUS);
5607 		goto done;
5608 	}
5609 
5610 	a->have_changes = 1;
5611 
5612 	p = in_repo_path;
5613 	while (p[0] == '/')
5614 		p++;
5615 	err = check_out_of_date(p, status, staged_status,
5616 	    blob_id, base_commit_idp, a->head_commit_id, a->repo,
5617 	    GOT_ERR_STAGE_OUT_OF_DATE);
5618 done:
5619 	free(in_repo_path);
5620 	return err;
5621 }
5622 
5623 struct stage_path_arg {
5624 	struct got_worktree *worktree;
5625 	struct got_fileindex *fileindex;
5626 	struct got_repository *repo;
5627 	got_worktree_status_cb status_cb;
5628 	void *status_arg;
5629 	got_worktree_patch_cb patch_cb;
5630 	void *patch_arg;
5631 };
5632 
5633 static const struct got_error *
5634 stage_path(void *arg, unsigned char status,
5635     unsigned char staged_status, const char *relpath,
5636     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
5637     struct got_object_id *commit_id)
5638 {
5639 	struct stage_path_arg *a = arg;
5640 	const struct got_error *err = NULL;
5641 	struct got_fileindex_entry *ie;
5642 	char *ondisk_path = NULL, *path_content = NULL;
5643 	uint32_t stage;
5644 	struct got_object_id *new_staged_blob_id = NULL;
5645 
5646 	if (status == GOT_STATUS_UNVERSIONED)
5647 		return NULL;
5648 
5649 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
5650 	if (ie == NULL)
5651 		return got_error_path(relpath, GOT_ERR_FILE_STATUS);
5652 
5653 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
5654 	    relpath)== -1)
5655 		return got_error_from_errno("asprintf");
5656 
5657 	switch (status) {
5658 	case GOT_STATUS_ADD:
5659 	case GOT_STATUS_MODIFY:
5660 		if (a->patch_cb) {
5661 			if (status == GOT_STATUS_ADD) {
5662 				int choice = GOT_PATCH_CHOICE_NONE;
5663 				err = (*a->patch_cb)(&choice, a->patch_arg,
5664 				    status, ie->path, NULL, 1, 1);
5665 				if (err)
5666 					break;
5667 				if (choice != GOT_PATCH_CHOICE_YES)
5668 					break;
5669 			} else {
5670 				err = create_patched_content(&path_content, 0,
5671 				    staged_blob_id ? staged_blob_id : blob_id,
5672 				    ondisk_path, ie->path, a->repo,
5673 				    a->patch_cb, a->patch_arg);
5674 				if (err || path_content == NULL)
5675 					break;
5676 			}
5677 		}
5678 		err = got_object_blob_create(&new_staged_blob_id,
5679 		    path_content ? path_content : ondisk_path, a->repo);
5680 		if (err)
5681 			break;
5682 		memcpy(ie->staged_blob_sha1, new_staged_blob_id->sha1,
5683 		    SHA1_DIGEST_LENGTH);
5684 		if (status == GOT_STATUS_ADD || staged_status == GOT_STATUS_ADD)
5685 			stage = GOT_FILEIDX_STAGE_ADD;
5686 		else
5687 			stage = GOT_FILEIDX_STAGE_MODIFY;
5688 		got_fileindex_entry_stage_set(ie, stage);
5689 		if (a->status_cb == NULL)
5690 			break;
5691 		err = (*a->status_cb)(a->status_arg, GOT_STATUS_NO_CHANGE,
5692 		    get_staged_status(ie), relpath, blob_id,
5693 		    new_staged_blob_id, NULL);
5694 		break;
5695 	case GOT_STATUS_DELETE:
5696 		if (staged_status == GOT_STATUS_DELETE)
5697 			break;
5698 		if (a->patch_cb) {
5699 			int choice = GOT_PATCH_CHOICE_NONE;
5700 			err = (*a->patch_cb)(&choice, a->patch_arg, status,
5701 			    ie->path, NULL, 1, 1);
5702 			if (err)
5703 				break;
5704 			if (choice == GOT_PATCH_CHOICE_NO)
5705 				break;
5706 			if (choice != GOT_PATCH_CHOICE_YES) {
5707 				err = got_error(GOT_ERR_PATCH_CHOICE);
5708 				break;
5709 			}
5710 		}
5711 		stage = GOT_FILEIDX_STAGE_DELETE;
5712 		got_fileindex_entry_stage_set(ie, stage);
5713 		if (a->status_cb == NULL)
5714 			break;
5715 		err = (*a->status_cb)(a->status_arg, GOT_STATUS_NO_CHANGE,
5716 		    get_staged_status(ie), relpath, NULL, NULL, NULL);
5717 		break;
5718 	case GOT_STATUS_NO_CHANGE:
5719 		err = got_error_path(relpath, GOT_ERR_STAGE_NO_CHANGE);
5720 		break;
5721 	case GOT_STATUS_CONFLICT:
5722 		err = got_error_path(relpath, GOT_ERR_STAGE_CONFLICT);
5723 		break;
5724 	case GOT_STATUS_NONEXISTENT:
5725 		err = got_error_set_errno(ENOENT, relpath);
5726 		break;
5727 	default:
5728 		err = got_error_path(relpath, GOT_ERR_FILE_STATUS);
5729 		break;
5730 	}
5731 
5732 	if (path_content && unlink(path_content) == -1 && err == NULL)
5733 		err = got_error_from_errno2("unlink", path_content);
5734 	free(path_content);
5735 	free(ondisk_path);
5736 	free(new_staged_blob_id);
5737 	return err;
5738 }
5739 
5740 const struct got_error *
5741 got_worktree_stage(struct got_worktree *worktree,
5742     struct got_pathlist_head *paths,
5743     got_worktree_status_cb status_cb, void *status_arg,
5744     got_worktree_patch_cb patch_cb, void *patch_arg,
5745     struct got_repository *repo)
5746 {
5747 	const struct got_error *err = NULL, *sync_err, *unlockerr;
5748 	struct got_pathlist_entry *pe;
5749 	struct got_fileindex *fileindex = NULL;
5750 	char *fileindex_path = NULL;
5751 	struct got_reference *head_ref = NULL;
5752 	struct got_object_id *head_commit_id = NULL;
5753 	struct check_stage_ok_arg oka;
5754 	struct stage_path_arg spa;
5755 
5756 	err = lock_worktree(worktree, LOCK_EX);
5757 	if (err)
5758 		return err;
5759 
5760 	err = got_ref_open(&head_ref, repo,
5761 	    got_worktree_get_head_ref_name(worktree), 0);
5762 	if (err)
5763 		goto done;
5764 	err = got_ref_resolve(&head_commit_id, repo, head_ref);
5765 	if (err)
5766 		goto done;
5767 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
5768 	if (err)
5769 		goto done;
5770 
5771 	/* Check pre-conditions before staging anything. */
5772 	oka.head_commit_id = head_commit_id;
5773 	oka.worktree = worktree;
5774 	oka.fileindex = fileindex;
5775 	oka.repo = repo;
5776 	oka.have_changes = 0;
5777 	TAILQ_FOREACH(pe, paths, entry) {
5778 		err = worktree_status(worktree, pe->path, fileindex, repo,
5779 		    check_stage_ok, &oka, NULL, NULL);
5780 		if (err)
5781 			goto done;
5782 	}
5783 	if (!oka.have_changes) {
5784 		err = got_error(GOT_ERR_STAGE_NO_CHANGE);
5785 		goto done;
5786 	}
5787 
5788 	spa.worktree = worktree;
5789 	spa.fileindex = fileindex;
5790 	spa.repo = repo;
5791 	spa.patch_cb = patch_cb;
5792 	spa.patch_arg = patch_arg;
5793 	spa.status_cb = status_cb;
5794 	spa.status_arg = status_arg;
5795 	TAILQ_FOREACH(pe, paths, entry) {
5796 		err = worktree_status(worktree, pe->path, fileindex, repo,
5797 		    stage_path, &spa, NULL, NULL);
5798 		if (err)
5799 			goto done;
5800 	}
5801 
5802 	sync_err = sync_fileindex(fileindex, fileindex_path);
5803 	if (sync_err && err == NULL)
5804 		err = sync_err;
5805 done:
5806 	if (head_ref)
5807 		got_ref_close(head_ref);
5808 	free(head_commit_id);
5809 	free(fileindex_path);
5810 	if (fileindex)
5811 		got_fileindex_free(fileindex);
5812 	unlockerr = lock_worktree(worktree, LOCK_SH);
5813 	if (unlockerr && err == NULL)
5814 		err = unlockerr;
5815 	return err;
5816 }
5817 
5818 struct unstage_path_arg {
5819 	struct got_worktree *worktree;
5820 	struct got_fileindex *fileindex;
5821 	struct got_repository *repo;
5822 	got_worktree_checkout_cb progress_cb;
5823 	void *progress_arg;
5824 	got_worktree_patch_cb patch_cb;
5825 	void *patch_arg;
5826 };
5827 
5828 static const struct got_error *
5829 create_unstaged_content(char **path_unstaged_content,
5830     char **path_new_staged_content, struct got_object_id *blob_id,
5831     struct got_object_id *staged_blob_id, const char *relpath,
5832     struct got_repository *repo,
5833     got_worktree_patch_cb patch_cb, void *patch_arg)
5834 {
5835 	const struct got_error *err;
5836 	struct got_blob_object *blob = NULL, *staged_blob = NULL;
5837 	FILE *f1 = NULL, *f2 = NULL, *outfile = NULL, *rejectfile = NULL;
5838 	char *path1 = NULL, *path2 = NULL, *label1 = NULL;
5839 	struct stat sb1, sb2;
5840 	struct got_diff_changes *changes = NULL;
5841 	struct got_diff_state *ds = NULL;
5842 	struct got_diff_args *args = NULL;
5843 	struct got_diff_change *change;
5844 	int diff_flags = 0, line_cur1 = 1, line_cur2 = 1, n = 0;
5845 	int have_content = 0, have_rejected_content = 0;
5846 
5847 	*path_unstaged_content = NULL;
5848 	*path_new_staged_content = NULL;
5849 
5850 	err = got_object_id_str(&label1, blob_id);
5851 	if (err)
5852 		return err;
5853 	err = got_object_open_as_blob(&blob, repo, blob_id, 8192);
5854 	if (err)
5855 		goto done;
5856 
5857 	err = got_opentemp_named(&path1, &f1, "got-unstage-blob-base");
5858 	if (err)
5859 		goto done;
5860 
5861 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f1, blob);
5862 	if (err)
5863 		goto done;
5864 
5865 	err = got_object_open_as_blob(&staged_blob, repo, staged_blob_id, 8192);
5866 	if (err)
5867 		goto done;
5868 
5869 	err = got_opentemp_named(&path2, &f2, "got-unstage-blob-staged");
5870 	if (err)
5871 		goto done;
5872 
5873 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f2, staged_blob);
5874 	if (err)
5875 		goto done;
5876 
5877 	if (stat(path1, &sb1) == -1) {
5878 		err = got_error_from_errno2("stat", path1);
5879 		goto done;
5880 	}
5881 
5882 	if (stat(path2, &sb2) == -1) {
5883 		err = got_error_from_errno2("stat", path2);
5884 		goto done;
5885 	}
5886 
5887 	err = got_diff_files(&changes, &ds, &args, &diff_flags,
5888 	    f1, sb1.st_size, label1, f2, sb2.st_size, path2, 3, NULL);
5889 	if (err)
5890 		goto done;
5891 
5892 	err = got_opentemp_named(path_unstaged_content, &outfile,
5893 	    "got-unstaged-content");
5894 	if (err)
5895 		goto done;
5896 	err = got_opentemp_named(path_new_staged_content, &rejectfile,
5897 	    "got-new-staged-content");
5898 	if (err)
5899 		goto done;
5900 
5901 	if (fseek(f1, 0L, SEEK_SET) == -1) {
5902 		err = got_ferror(f1, GOT_ERR_IO);
5903 		goto done;
5904 	}
5905 	if (fseek(f2, 0L, SEEK_SET) == -1) {
5906 		err = got_ferror(f2, GOT_ERR_IO);
5907 		goto done;
5908 	}
5909 	SIMPLEQ_FOREACH(change, &changes->entries, entry) {
5910 		int choice;
5911 		err = apply_or_reject_change(&choice, change, ++n,
5912 		    changes->nchanges, ds, args, diff_flags, relpath,
5913 		    f1, f2, &line_cur1, &line_cur2,
5914 		    outfile, rejectfile, patch_cb, patch_arg);
5915 		if (err)
5916 			goto done;
5917 		if (choice == GOT_PATCH_CHOICE_YES)
5918 			have_content = 1;
5919 		else
5920 			have_rejected_content = 1;
5921 		if (choice == GOT_PATCH_CHOICE_QUIT)
5922 			break;
5923 	}
5924 	if (have_content || have_rejected_content)
5925 		err = copy_remaining_content(f1, f2, &line_cur1, &line_cur2,
5926 		    outfile, rejectfile);
5927 done:
5928 	free(label1);
5929 	if (blob)
5930 		got_object_blob_close(blob);
5931 	if (staged_blob)
5932 		got_object_blob_close(staged_blob);
5933 	if (f1 && fclose(f1) == EOF && err == NULL)
5934 		err = got_error_from_errno2("fclose", path1);
5935 	if (f2 && fclose(f2) == EOF && err == NULL)
5936 		err = got_error_from_errno2("fclose", path2);
5937 	if (outfile && fclose(outfile) == EOF && err == NULL)
5938 		err = got_error_from_errno2("fclose", *path_unstaged_content);
5939 	if (rejectfile && fclose(rejectfile) == EOF && err == NULL)
5940 		err = got_error_from_errno2("fclose", *path_new_staged_content);
5941 	if (path1 && unlink(path1) == -1 && err == NULL)
5942 		err = got_error_from_errno2("unlink", path1);
5943 	if (path2 && unlink(path2) == -1 && err == NULL)
5944 		err = got_error_from_errno2("unlink", path2);
5945 	if (err || !have_content) {
5946 		if (*path_unstaged_content &&
5947 		    unlink(*path_unstaged_content) == -1 && err == NULL)
5948 			err = got_error_from_errno2("unlink",
5949 			    *path_unstaged_content);
5950 		free(*path_unstaged_content);
5951 		*path_unstaged_content = NULL;
5952 	}
5953 	if (err || !have_rejected_content) {
5954 		if (*path_new_staged_content &&
5955 		    unlink(*path_new_staged_content) == -1 && err == NULL)
5956 			err = got_error_from_errno2("unlink",
5957 			    *path_new_staged_content);
5958 		free(*path_new_staged_content);
5959 		*path_new_staged_content = NULL;
5960 	}
5961 	free(args);
5962 	if (ds) {
5963 		got_diff_state_free(ds);
5964 		free(ds);
5965 	}
5966 	if (changes)
5967 		got_diff_free_changes(changes);
5968 	free(path1);
5969 	free(path2);
5970 	return err;
5971 }
5972 
5973 static const struct got_error *
5974 unstage_path(void *arg, unsigned char status,
5975     unsigned char staged_status, const char *relpath,
5976     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
5977     struct got_object_id *commit_id)
5978 {
5979 	const struct got_error *err = NULL;
5980 	struct unstage_path_arg *a = arg;
5981 	struct got_fileindex_entry *ie;
5982 	struct got_blob_object *blob_base = NULL, *blob_staged = NULL;
5983 	char *ondisk_path = NULL, *path_unstaged_content = NULL;
5984 	char *path_new_staged_content = NULL;
5985 	int local_changes_subsumed;
5986 	struct stat sb;
5987 
5988 	if (staged_status != GOT_STATUS_ADD &&
5989 	    staged_status != GOT_STATUS_MODIFY &&
5990 	    staged_status != GOT_STATUS_DELETE)
5991 		return NULL;
5992 
5993 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
5994 	if (ie == NULL)
5995 		return got_error_path(relpath, GOT_ERR_FILE_STATUS);
5996 
5997 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path, relpath)
5998 	    == -1)
5999 		return got_error_from_errno("asprintf");
6000 
6001 	switch (staged_status) {
6002 	case GOT_STATUS_MODIFY:
6003 		err = got_object_open_as_blob(&blob_base, a->repo,
6004 		    blob_id, 8192);
6005 		if (err)
6006 			break;
6007 		/* fall through */
6008 	case GOT_STATUS_ADD:
6009 		if (a->patch_cb) {
6010 			if (staged_status == GOT_STATUS_ADD) {
6011 				int choice = GOT_PATCH_CHOICE_NONE;
6012 				err = (*a->patch_cb)(&choice, a->patch_arg,
6013 				    staged_status, ie->path, NULL, 1, 1);
6014 				if (err)
6015 					break;
6016 				if (choice != GOT_PATCH_CHOICE_YES)
6017 					break;
6018 			} else {
6019 				err = create_unstaged_content(
6020 				    &path_unstaged_content,
6021 				    &path_new_staged_content, blob_id,
6022 				    staged_blob_id, ie->path, a->repo,
6023 				    a->patch_cb, a->patch_arg);
6024 				if (err || path_unstaged_content == NULL)
6025 					break;
6026 				if (path_new_staged_content) {
6027 					err = got_object_blob_create(
6028 					    &staged_blob_id,
6029 					    path_new_staged_content,
6030 					    a->repo);
6031 					if (err)
6032 						break;
6033 					memcpy(ie->staged_blob_sha1,
6034 					    staged_blob_id->sha1,
6035 					    SHA1_DIGEST_LENGTH);
6036 				}
6037 				err = merge_file(&local_changes_subsumed,
6038 				    a->worktree, blob_base, ondisk_path,
6039 				    relpath, got_fileindex_perms_to_st(ie),
6040 				    path_unstaged_content, "unstaged",
6041 				    a->repo, a->progress_cb, a->progress_arg);
6042 				if (err == NULL &&
6043 				    path_new_staged_content == NULL)
6044 					got_fileindex_entry_stage_set(ie,
6045 					    GOT_FILEIDX_STAGE_NONE);
6046 				break; /* Done with this file. */
6047 			}
6048 		}
6049 		err = got_object_open_as_blob(&blob_staged, a->repo,
6050 		    staged_blob_id, 8192);
6051 		if (err)
6052 			break;
6053 		err = merge_blob(&local_changes_subsumed, a->worktree,
6054 		    blob_base, ondisk_path, relpath,
6055 		    got_fileindex_perms_to_st(ie), blob_staged,
6056 		    commit_id ? commit_id : a->worktree->base_commit_id,
6057 		    a->repo, a->progress_cb, a->progress_arg);
6058 		if (err == NULL)
6059 			got_fileindex_entry_stage_set(ie,
6060 			    GOT_FILEIDX_STAGE_NONE);
6061 		break;
6062 	case GOT_STATUS_DELETE:
6063 		if (a->patch_cb) {
6064 			int choice = GOT_PATCH_CHOICE_NONE;
6065 			err = (*a->patch_cb)(&choice, a->patch_arg,
6066 			    staged_status, ie->path, NULL, 1, 1);
6067 			if (err)
6068 				break;
6069 			if (choice == GOT_PATCH_CHOICE_NO)
6070 				break;
6071 			if (choice != GOT_PATCH_CHOICE_YES) {
6072 				err = got_error(GOT_ERR_PATCH_CHOICE);
6073 				break;
6074 			}
6075 		}
6076 		got_fileindex_entry_stage_set(ie, GOT_FILEIDX_STAGE_NONE);
6077 		err = get_file_status(&status, &sb, ie, ondisk_path, a->repo);
6078 		if (err)
6079 			break;
6080 		err = (*a->progress_cb)(a->progress_arg, status, relpath);
6081 		break;
6082 	}
6083 
6084 	free(ondisk_path);
6085 	if (path_unstaged_content &&
6086 	    unlink(path_unstaged_content) == -1 && err == NULL)
6087 		err = got_error_from_errno2("unlink", path_unstaged_content);
6088 	if (path_new_staged_content &&
6089 	    unlink(path_new_staged_content) == -1 && err == NULL)
6090 		err = got_error_from_errno2("unlink", path_new_staged_content);
6091 	free(path_unstaged_content);
6092 	free(path_new_staged_content);
6093 	if (blob_base)
6094 		got_object_blob_close(blob_base);
6095 	if (blob_staged)
6096 		got_object_blob_close(blob_staged);
6097 	return err;
6098 }
6099 
6100 const struct got_error *
6101 got_worktree_unstage(struct got_worktree *worktree,
6102     struct got_pathlist_head *paths,
6103     got_worktree_checkout_cb progress_cb, void *progress_arg,
6104     got_worktree_patch_cb patch_cb, void *patch_arg,
6105     struct got_repository *repo)
6106 {
6107 	const struct got_error *err = NULL, *sync_err, *unlockerr;
6108 	struct got_pathlist_entry *pe;
6109 	struct got_fileindex *fileindex = NULL;
6110 	char *fileindex_path = NULL;
6111 	struct unstage_path_arg upa;
6112 
6113 	err = lock_worktree(worktree, LOCK_EX);
6114 	if (err)
6115 		return err;
6116 
6117 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
6118 	if (err)
6119 		goto done;
6120 
6121 	upa.worktree = worktree;
6122 	upa.fileindex = fileindex;
6123 	upa.repo = repo;
6124 	upa.progress_cb = progress_cb;
6125 	upa.progress_arg = progress_arg;
6126 	upa.patch_cb = patch_cb;
6127 	upa.patch_arg = patch_arg;
6128 	TAILQ_FOREACH(pe, paths, entry) {
6129 		err = worktree_status(worktree, pe->path, fileindex, repo,
6130 		    unstage_path, &upa, NULL, NULL);
6131 		if (err)
6132 			goto done;
6133 	}
6134 
6135 	sync_err = sync_fileindex(fileindex, fileindex_path);
6136 	if (sync_err && err == NULL)
6137 		err = sync_err;
6138 done:
6139 	free(fileindex_path);
6140 	if (fileindex)
6141 		got_fileindex_free(fileindex);
6142 	unlockerr = lock_worktree(worktree, LOCK_SH);
6143 	if (unlockerr && err == NULL)
6144 		err = unlockerr;
6145 	return err;
6146 }