1 /*
2  * Copyright (c) 2022 Omar Polo <op@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  * Apply patches.
17  *
18  * Things that we may want to support:
19  *     + support indented patches?
20  *     + support other kinds of patches?
21  */
22 
23 #include <sys/types.h>
24 #include <sys/queue.h>
25 #include <sys/socket.h>
26 #include <sys/stat.h>
27 #include <sys/uio.h>
28 
29 #include <errno.h>
30 #include <limits.h>
31 #include <sha1.h>
32 #include <stdint.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <imsg.h>
38 
39 #include "got_error.h"
40 #include "got_object.h"
41 #include "got_path.h"
42 #include "got_reference.h"
43 #include "got_cancel.h"
44 #include "got_worktree.h"
45 #include "got_opentemp.h"
46 #include "got_patch.h"
47 
48 #include "got_lib_delta.h"
49 #include "got_lib_object.h"
50 #include "got_lib_privsep.h"
51 
52 #define MIN(a, b) ((a) < (b) ? (a) : (b))
53 
54 struct got_patch_hunk {
55 	STAILQ_ENTRY(got_patch_hunk) entries;
56 	const struct got_error *err;
57 	long	offset;
58 	int	nonl;
59 	long	old_from;
60 	long	old_lines;
61 	long	new_from;
62 	long	new_lines;
63 	size_t	len;
64 	size_t	cap;
65 	char	**lines;
66 };
67 
68 STAILQ_HEAD(got_patch_hunk_head, got_patch_hunk);
69 struct got_patch {
70 	char	*old;
71 	char	*new;
72 	struct got_patch_hunk_head head;
73 };
74 
75 struct patch_args {
76 	got_patch_progress_cb progress_cb;
77 	void	*progress_arg;
78 	struct got_patch_hunk_head *head;
79 };
80 
81 static const struct got_error *
82 send_patch(struct imsgbuf *ibuf, int fd)
83 {
84 	const struct got_error *err = NULL;
85 
86 	if (imsg_compose(ibuf, GOT_IMSG_PATCH_FILE, 0, 0, fd,
87 	    NULL, 0) == -1) {
88 		err = got_error_from_errno(
89 		    "imsg_compose GOT_IMSG_PATCH_FILE");
90 		close(fd);
91 		return err;
92 	}
93 
94 	if (imsg_flush(ibuf) == -1) {
95 		err = got_error_from_errno("imsg_flush");
96 		imsg_clear(ibuf);
97 	}
98 
99 	return err;
100 }
101 
102 static void
103 patch_free(struct got_patch *p)
104 {
105 	struct got_patch_hunk *h;
106 	size_t i;
107 
108 	while (!STAILQ_EMPTY(&p->head)) {
109 		h = STAILQ_FIRST(&p->head);
110 		STAILQ_REMOVE_HEAD(&p->head, entries);
111 
112 		for (i = 0; i < h->len; ++i)
113 			free(h->lines[i]);
114 		free(h->lines);
115 		free(h);
116 	}
117 
118 	free(p->new);
119 	free(p->old);
120 }
121 
122 static const struct got_error *
123 pushline(struct got_patch_hunk *h, const char *line)
124 {
125 	void 	*t;
126 	size_t	 newcap;
127 
128 	if (h->len == h->cap) {
129 		if ((newcap = h->cap * 1.5) == 0)
130 			newcap = 16;
131 		t = recallocarray(h->lines, h->cap, newcap,
132 		    sizeof(h->lines[0]));
133 		if (t == NULL)
134 			return got_error_from_errno("recallocarray");
135 		h->lines = t;
136 		h->cap = newcap;
137 	}
138 
139 	if ((t = strdup(line)) == NULL)
140 		return got_error_from_errno("strdup");
141 
142 	h->lines[h->len++] = t;
143 	return NULL;
144 }
145 
146 static const struct got_error *
147 recv_patch(struct imsgbuf *ibuf, int *done, struct got_patch *p, int strip)
148 {
149 	const struct got_error *err = NULL;
150 	struct imsg imsg;
151 	struct got_imsg_patch_hunk hdr;
152 	struct got_imsg_patch patch;
153 	struct got_patch_hunk *h = NULL;
154 	size_t datalen;
155 
156 	memset(p, 0, sizeof(*p));
157 	STAILQ_INIT(&p->head);
158 
159 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
160 	if (err)
161 		return err;
162 	if (imsg.hdr.type == GOT_IMSG_PATCH_EOF) {
163 		*done = 1;
164 		goto done;
165 	}
166 	if (imsg.hdr.type != GOT_IMSG_PATCH) {
167 		err = got_error(GOT_ERR_PRIVSEP_MSG);
168 		goto done;
169 	}
170 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
171 	if (datalen != sizeof(patch)) {
172 		err = got_error(GOT_ERR_PRIVSEP_LEN);
173 		goto done;
174 	}
175 	memcpy(&patch, imsg.data, sizeof(patch));
176 
177 	/* automatically set strip=1 for git-style diffs */
178 	if (strip == -1 && patch.git &&
179 	    (*patch.old == '\0' || !strncmp(patch.old, "a/", 2)) &&
180 	    (*patch.new == '\0' || !strncmp(patch.new, "b/", 2)))
181 		strip = 1;
182 
183 	/* prefer the new name if not /dev/null for not git-style diffs */
184 	if (!patch.git && *patch.new != '\0' && *patch.old != '\0') {
185 		err = got_path_strip(&p->old, patch.new, strip);
186 		if (err)
187 			goto done;
188 	} else if (*patch.old != '\0') {
189 		err = got_path_strip(&p->old, patch.old, strip);
190 		if (err)
191 			goto done;
192 	}
193 
194 	if (*patch.new != '\0') {
195 		err = got_path_strip(&p->new, patch.new, strip);
196 		if (err)
197 			goto done;
198 	}
199 
200 	if (p->old == NULL && p->new == NULL) {
201 		err = got_error(GOT_ERR_PATCH_MALFORMED);
202 		goto done;
203 	}
204 
205 	imsg_free(&imsg);
206 
207 	for (;;) {
208 		char *t;
209 
210 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
211 		if (err)
212 			return err;
213 
214 		switch (imsg.hdr.type) {
215 		case GOT_IMSG_PATCH_DONE:
216 			goto done;
217 		case GOT_IMSG_PATCH_HUNK:
218 			if (h != NULL && h->nonl) {
219 				err = got_error(GOT_ERR_PATCH_MALFORMED);
220 				goto done;
221 			}
222 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
223 			if (datalen != sizeof(hdr)) {
224 				err = got_error(GOT_ERR_PRIVSEP_LEN);
225 				goto done;
226 			}
227 			memcpy(&hdr, imsg.data, sizeof(hdr));
228 			if ((h = calloc(1, sizeof(*h))) == NULL) {
229 				err = got_error_from_errno("calloc");
230 				goto done;
231 			}
232 			h->old_from = hdr.oldfrom;
233 			h->old_lines = hdr.oldlines;
234 			h->new_from = hdr.newfrom;
235 			h->new_lines = hdr.newlines;
236 			STAILQ_INSERT_TAIL(&p->head, h, entries);
237 			break;
238 		case GOT_IMSG_PATCH_LINE:
239 			if (h == NULL) {
240 				err = got_error(GOT_ERR_PRIVSEP_MSG);
241 				goto done;
242 			}
243 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
244 			t = imsg.data;
245 			/* at least one char */
246 			if (datalen < 2 || t[datalen-1] != '\0') {
247 				err = got_error(GOT_ERR_PRIVSEP_MSG);
248 				goto done;
249 			}
250 			if (*t != ' ' && *t != '-' && *t != '+' &&
251 			    *t != '\\') {
252 				err = got_error(GOT_ERR_PRIVSEP_MSG);
253 				goto done;
254 			}
255 			if (h->nonl)
256 				err = got_error(GOT_ERR_PATCH_MALFORMED);
257 			if (*t == '\\')
258 				h->nonl = 1;
259 			else
260 				err = pushline(h, t);
261 			if (err)
262 				goto done;
263 			break;
264 		default:
265 			err = got_error(GOT_ERR_PRIVSEP_MSG);
266 			goto done;
267 		}
268 
269 		imsg_free(&imsg);
270 	}
271 
272 done:
273 	imsg_free(&imsg);
274 	return err;
275 }
276 
277 /*
278  * Copy data from orig starting at copypos until pos into tmp.
279  * If pos is -1, copy until EOF.
280  */
281 static const struct got_error *
282 copy(FILE *tmp, FILE *orig, off_t copypos, off_t pos)
283 {
284 	char buf[BUFSIZ];
285 	size_t len, r, w;
286 
287 	if (fseek(orig, copypos, SEEK_SET) == -1)
288 		return got_error_from_errno("fseek");
289 
290 	while (pos == -1 || copypos < pos) {
291 		len = sizeof(buf);
292 		if (pos > 0)
293 			len = MIN(len, (size_t)pos - copypos);
294 		r = fread(buf, 1, len, orig);
295 		if (r != len && ferror(orig))
296 			return got_error_from_errno("fread");
297 		w = fwrite(buf, 1, r, tmp);
298 		if (w != r)
299 			return got_error_from_errno("fwrite");
300 		copypos += len;
301 		if (r != len && feof(orig)) {
302 			if (pos == -1)
303 				return NULL;
304 			return got_error(GOT_ERR_HUNK_FAILED);
305 		}
306 	}
307 	return NULL;
308 }
309 
310 static const struct got_error *
311 locate_hunk(FILE *orig, struct got_patch_hunk *h, off_t *pos, long *lineno)
312 {
313 	const struct got_error *err = NULL;
314 	char *line = NULL;
315 	char mode = *h->lines[0];
316 	size_t linesize = 0;
317 	ssize_t linelen;
318 	off_t match = -1;
319 	long match_lineno = -1;
320 
321 	for (;;) {
322 		linelen = getline(&line, &linesize, orig);
323 		if (linelen == -1) {
324 			if (ferror(orig))
325 				err = got_error_from_errno("getline");
326 			else if (match == -1)
327 				err = got_error(GOT_ERR_HUNK_FAILED);
328 			break;
329 		}
330 		if (line[linelen - 1] == '\n')
331 			line[linelen - 1] = '\0';
332 		(*lineno)++;
333 
334 		if ((mode == ' ' && !strcmp(h->lines[0] + 1, line)) ||
335 		    (mode == '-' && !strcmp(h->lines[0] + 1, line)) ||
336 		    (mode == '+' && *lineno == h->old_from)) {
337 			match = ftello(orig);
338 			if (match == -1) {
339 				err = got_error_from_errno("ftello");
340 				break;
341 			}
342 			match -= linelen;
343 			match_lineno = (*lineno)-1;
344 		}
345 
346 		if (*lineno >= h->old_from && match != -1)
347 			break;
348 	}
349 
350 	if (err == NULL) {
351 		*pos = match;
352 		*lineno = match_lineno;
353 		if (fseek(orig, match, SEEK_SET) == -1)
354 			err = got_error_from_errno("fseek");
355 	}
356 
357 	free(line);
358 	return err;
359 }
360 
361 static const struct got_error *
362 test_hunk(FILE *orig, struct got_patch_hunk *h)
363 {
364 	const struct got_error *err = NULL;
365 	char *line = NULL;
366 	size_t linesize = 0, i = 0;
367 	ssize_t linelen;
368 
369 	for (i = 0; i < h->len; ++i) {
370 		switch (*h->lines[i]) {
371 		case '+':
372 			continue;
373 		case ' ':
374 		case '-':
375 			linelen = getline(&line, &linesize, orig);
376 			if (linelen == -1) {
377 				if (ferror(orig))
378 					err = got_error_from_errno("getline");
379 				else
380 					err = got_error(
381 					    GOT_ERR_HUNK_FAILED);
382 				goto done;
383 			}
384 			if (line[linelen - 1] == '\n')
385 				line[linelen - 1] = '\0';
386 			if (strcmp(h->lines[i] + 1, line)) {
387 				err = got_error(GOT_ERR_HUNK_FAILED);
388 				goto done;
389 			}
390 			break;
391 		}
392 	}
393 
394 done:
395 	free(line);
396 	return err;
397 }
398 
399 static const struct got_error *
400 apply_hunk(FILE *tmp, struct got_patch_hunk *h, long *lineno)
401 {
402 	size_t i = 0;
403 
404 	for (i = 0; i < h->len; ++i) {
405 		switch (*h->lines[i]) {
406 		case ' ':
407 			if (fprintf(tmp, "%s\n", h->lines[i] + 1) < 0)
408 				return got_error_from_errno("fprintf");
409 			/* fallthrough */
410 		case '-':
411 			(*lineno)++;
412 			break;
413 		case '+':
414 			if (fprintf(tmp, "%s", h->lines[i] + 1) < 0)
415 				return got_error_from_errno("fprintf");
416 			if (i != h->len - 1 || !h->nonl) {
417 				if (fprintf(tmp, "\n") < 0)
418 					return got_error_from_errno(
419 					    "fprintf");
420 			}
421 			break;
422 		}
423 	}
424 	return NULL;
425 }
426 
427 static const struct got_error *
428 patch_file(struct got_patch *p, const char *path, FILE *tmp, int nop,
429     mode_t *mode)
430 {
431 	const struct got_error *err = NULL;
432 	struct got_patch_hunk *h;
433 	struct stat sb;
434 	long lineno = 0;
435 	FILE *orig;
436 	off_t copypos, pos;
437 	char *line = NULL;
438 	size_t linesize = 0;
439 	ssize_t linelen;
440 
441 	if (p->old == NULL) {				/* create */
442 		h = STAILQ_FIRST(&p->head);
443 		if (h == NULL || STAILQ_NEXT(h, entries) != NULL)
444 			return got_error(GOT_ERR_PATCH_MALFORMED);
445 		if (nop)
446 			return NULL;
447 		return apply_hunk(tmp, h, &lineno);
448 	}
449 
450 	if ((orig = fopen(path, "r")) == NULL) {
451 		err = got_error_from_errno2("fopen", path);
452 		goto done;
453 	}
454 
455 	if (fstat(fileno(orig), &sb) == -1) {
456 		err = got_error_from_errno("fstat");
457 		goto done;
458 	}
459 	*mode = sb.st_mode;
460 
461 	copypos = 0;
462 	STAILQ_FOREACH(h, &p->head, entries) {
463 		if (h->lines == NULL)
464 			break;
465 
466 	tryagain:
467 		err = locate_hunk(orig, h, &pos, &lineno);
468 		if (err != NULL && err->code == GOT_ERR_HUNK_FAILED)
469 			h->err = err;
470 		if (err != NULL)
471 			goto done;
472 		if (!nop)
473 			err = copy(tmp, orig, copypos, pos);
474 		if (err != NULL)
475 			goto done;
476 		copypos = pos;
477 
478 		err = test_hunk(orig, h);
479 		if (err != NULL && err->code == GOT_ERR_HUNK_FAILED) {
480 			/*
481 			 * try to apply the hunk again starting the search
482 			 * after the previous partial match.
483 			 */
484 			if (fseek(orig, pos, SEEK_SET) == -1) {
485 				err = got_error_from_errno("fseek");
486 				goto done;
487 			}
488 			linelen = getline(&line, &linesize, orig);
489 			if (linelen == -1) {
490 				err = got_error_from_errno("getline");
491 				goto done;
492 			}
493 			lineno++;
494 			goto tryagain;
495 		}
496 		if (err != NULL)
497 			goto done;
498 
499 		if (lineno + 1 != h->old_from)
500 			h->offset = lineno + 1 - h->old_from;
501 
502 		if (!nop)
503 			err = apply_hunk(tmp, h, &lineno);
504 		if (err != NULL)
505 			goto done;
506 
507 		copypos = ftello(orig);
508 		if (copypos == -1) {
509 			err = got_error_from_errno("ftello");
510 			goto done;
511 		}
512 	}
513 
514 	if (p->new == NULL && sb.st_size != copypos) {
515 		h = STAILQ_FIRST(&p->head);
516 		h->err = got_error(GOT_ERR_HUNK_FAILED);
517 		err = h->err;
518 	} else if (!nop && !feof(orig))
519 		err = copy(tmp, orig, copypos, -1);
520 
521 done:
522 	if (orig != NULL)
523 		fclose(orig);
524 	return err;
525 }
526 
527 static const struct got_error *
528 report_progress(struct patch_args *pa, const char *old, const char *new,
529     unsigned char status, const struct got_error *orig_error)
530 {
531 	const struct got_error *err;
532 	struct got_patch_hunk *h;
533 
534 	err = pa->progress_cb(pa->progress_arg, old, new, status,
535 	    orig_error, 0, 0, 0, 0, 0, NULL);
536 	if (err)
537 		return err;
538 
539 	STAILQ_FOREACH(h, pa->head, entries) {
540 		if (h->offset == 0 && h->err == NULL)
541 			continue;
542 
543 		err = pa->progress_cb(pa->progress_arg, old, new, 0, NULL,
544 		    h->old_from, h->old_lines, h->new_from, h->new_lines,
545 		    h->offset, h->err);
546 		if (err)
547 			return err;
548 	}
549 
550 	return NULL;
551 }
552 
553 static const struct got_error *
554 patch_delete(void *arg, unsigned char status, unsigned char staged_status,
555     const char *path)
556 {
557 	return report_progress(arg, path, NULL, status, NULL);
558 }
559 
560 static const struct got_error *
561 patch_add(void *arg, unsigned char status, const char *path)
562 {
563 	return report_progress(arg, NULL, path, status, NULL);
564 }
565 
566 static const struct got_error *
567 apply_patch(struct got_worktree *worktree, struct got_repository *repo,
568     const char *oldpath, const char *newpath, struct got_patch *p,
569     int nop, struct patch_args *pa, got_cancel_cb cancel_cb, void *cancel_arg)
570 {
571 	const struct got_error *err = NULL;
572 	struct got_pathlist_head oldpaths, newpaths;
573 	struct got_pathlist_entry *pe;
574 	int file_renamed = 0;
575 	char *tmppath = NULL, *template = NULL, *parent = NULL;;
576 	FILE *tmp = NULL;
577 	mode_t mode = GOT_DEFAULT_FILE_MODE;
578 
579 	TAILQ_INIT(&oldpaths);
580 	TAILQ_INIT(&newpaths);
581 
582 	err = got_pathlist_insert(&pe, &oldpaths, oldpath, NULL);
583 	if (err)
584 		goto done;
585 	err = got_pathlist_insert(&pe, &newpaths, newpath, NULL);
586 	if (err)
587 		goto done;
588 
589 	file_renamed = strcmp(oldpath, newpath);
590 
591 	if (asprintf(&template, "%s/got-patch",
592 	    got_worktree_get_root_path(worktree)) == -1) {
593 		err = got_error_from_errno(template);
594 		goto done;
595 	}
596 
597 	if (!nop)
598 		err = got_opentemp_named(&tmppath, &tmp, template);
599 	if (err)
600 		goto done;
601 	err = patch_file(p, oldpath, tmp, nop, &mode);
602 	if (err)
603 		goto done;
604 
605 	if (nop)
606 		goto done;
607 
608 	if (p->old != NULL && p->new == NULL) {
609 		err = got_worktree_schedule_delete(worktree, &oldpaths,
610 		    0, NULL, patch_delete, pa, repo, 0, 0);
611 		goto done;
612 	}
613 
614 	if (fchmod(fileno(tmp), mode) == -1) {
615 		err = got_error_from_errno2("chmod", newpath);
616 		goto done;
617 	}
618 
619 	if (rename(tmppath, newpath) == -1) {
620 		if (errno != ENOENT) {
621 			err = got_error_from_errno3("rename", tmppath,
622 			    newpath);
623 			goto done;
624 		}
625 
626 		err = got_path_dirname(&parent, newpath);
627 		if (err != NULL)
628 			goto done;
629 		err = got_path_mkdir(parent);
630 		if (err != NULL)
631 			goto done;
632 		if (rename(tmppath, newpath) == -1) {
633 			err = got_error_from_errno3("rename", tmppath,
634 			    newpath);
635 			goto done;
636 		}
637 	}
638 
639 	if (file_renamed) {
640 		err = got_worktree_schedule_delete(worktree, &oldpaths,
641 		    0, NULL, patch_delete, pa, repo, 0, 0);
642 		if (err == NULL)
643 			err = got_worktree_schedule_add(worktree, &newpaths,
644 			    patch_add, pa, repo, 1);
645 		if (err)
646 			unlink(newpath);
647 	} else if (p->old == NULL) {
648 		err = got_worktree_schedule_add(worktree, &newpaths,
649 		    patch_add, pa, repo, 1);
650 		if (err)
651 			unlink(newpath);
652 	} else
653 		err = report_progress(pa, oldpath, newpath, GOT_STATUS_MODIFY,
654 		    NULL);
655 
656 done:
657 	got_pathlist_free(&oldpaths);
658 	got_pathlist_free(&newpaths);
659 	free(parent);
660 	free(template);
661 	if (tmppath != NULL)
662 		unlink(tmppath);
663 	free(tmppath);
664 	return err;
665 }
666 
667 const struct got_error *
668 got_patch(int fd, struct got_worktree *worktree, struct got_repository *repo,
669     int nop, int strip, got_patch_progress_cb progress_cb, void *progress_arg,
670     got_cancel_cb cancel_cb, void *cancel_arg)
671 {
672 	const struct got_error *err = NULL;
673 	struct got_fileindex *fileindex = NULL;
674 	char *oldpath, *newpath;
675 	struct imsgbuf *ibuf;
676 	int imsg_fds[2] = {-1, -1};
677 	int done = 0, failed = 0;
678 	pid_t pid;
679 
680 	ibuf = calloc(1, sizeof(*ibuf));
681 	if (ibuf == NULL) {
682 		err = got_error_from_errno("calloc");
683 		goto done;
684 	}
685 
686 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
687 		err = got_error_from_errno("socketpair");
688 		goto done;
689 	}
690 
691 	pid = fork();
692 	if (pid == -1) {
693 		err = got_error_from_errno("fork");
694 		goto done;
695 	} else if (pid == 0) {
696 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PATCH,
697 		    NULL);
698 		/* not reached */
699 	}
700 
701 	if (close(imsg_fds[1]) == -1) {
702 		err = got_error_from_errno("close");
703 		goto done;
704 	}
705 	imsg_fds[1] = -1;
706 	imsg_init(ibuf, imsg_fds[0]);
707 
708 	err = send_patch(ibuf, fd);
709 	fd = -1;
710 	if (err)
711 		goto done;
712 
713 	err = got_worktree_patch_prepare(&fileindex, worktree);
714 	if (err)
715 		goto done;
716 
717 	while (!done && err == NULL) {
718 		struct got_patch p;
719 		struct patch_args pa;
720 
721 		pa.progress_cb = progress_cb;
722 		pa.progress_arg = progress_arg;
723 		pa.head = &p.head;
724 
725 		err = recv_patch(ibuf, &done, &p, strip);
726 		if (err || done)
727 			break;
728 
729 		err = got_worktree_patch_check_path(p.old, p.new, &oldpath,
730 		    &newpath, worktree, repo, fileindex);
731 		if (err == NULL)
732 			err = apply_patch(worktree, repo, oldpath, newpath,
733 			    &p, nop, &pa, cancel_cb, cancel_arg);
734 		if (err != NULL) {
735 			failed = 1;
736 			/* recoverable errors */
737 			if (err->code == GOT_ERR_FILE_STATUS ||
738 			    (err->code == GOT_ERR_ERRNO && errno == ENOENT))
739 				err = report_progress(&pa, p.old, p.new,
740 				    GOT_STATUS_CANNOT_UPDATE, err);
741 			else if (err->code == GOT_ERR_HUNK_FAILED)
742 				err = report_progress(&pa, p.old, p.new,
743 				    GOT_STATUS_CANNOT_UPDATE, NULL);
744 		}
745 
746 		free(oldpath);
747 		free(newpath);
748 		patch_free(&p);
749 
750 		if (err)
751 			break;
752 	}
753 
754 done:
755 	if (fileindex)
756 		got_worktree_patch_complete(fileindex);
757 	if (fd != -1 && close(fd) == -1 && err == NULL)
758 		err = got_error_from_errno("close");
759 	if (ibuf != NULL)
760 		imsg_clear(ibuf);
761 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
762 		err = got_error_from_errno("close");
763 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
764 		err = got_error_from_errno("close");
765 	if (err == NULL && failed)
766 		err = got_error(GOT_ERR_PATCH_FAILED);
767 	return err;
768 }