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