1 /*
2  * Copyright (c) 2018 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 
21 #include <string.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <fcntl.h>
25 #include <errno.h>
26 #include <unistd.h>
27 #include <sha1.h>
28 #include <zlib.h>
29 #include <fnmatch.h>
30 
31 #include "got_error.h"
32 #include "got_repository.h"
33 #include "got_reference.h"
34 #include "got_object.h"
35 #include "got_worktree.h"
36 #include "got_opentemp.h"
37 
38 #include "got_lib_worktree.h"
39 #include "got_lib_path.h"
40 #include "got_lib_sha1.h"
41 #include "got_lib_fileindex.h"
42 #include "got_lib_inflate.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_object.h"
45 
46 #ifndef MIN
47 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
48 #endif
49 
50 static const struct got_error *
51 create_meta_file(const char *path_got, const char *name, const char *content)
52 {
53 	const struct got_error *err = NULL;
54 	char *path;
55 	int fd = -1;
56 
57 	if (asprintf(&path, "%s/%s", path_got, name) == -1) {
58 		err = got_error_from_errno();
59 		path = NULL;
60 		goto done;
61 	}
62 
63 	fd = open(path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW,
64 	    GOT_DEFAULT_FILE_MODE);
65 	if (fd == -1) {
66 		err = got_error_from_errno();
67 		goto done;
68 	}
69 
70 	if (content) {
71 		int len = dprintf(fd, "%s\n", content);
72 		if (len != strlen(content) + 1) {
73 			err = got_error_from_errno();
74 			goto done;
75 		}
76 	}
77 
78 done:
79 	if (fd != -1 && close(fd) == -1 && err == NULL)
80 		err = got_error_from_errno();
81 	free(path);
82 	return err;
83 }
84 
85 static const struct got_error *
86 read_meta_file(char **content, const char *path_got, const char *name)
87 {
88 	const struct got_error *err = NULL;
89 	char *path;
90 	int fd = -1;
91 	ssize_t n;
92 	struct stat sb;
93 
94 	*content = NULL;
95 
96 	if (asprintf(&path, "%s/%s", path_got, name) == -1) {
97 		err = got_error_from_errno();
98 		path = NULL;
99 		goto done;
100 	}
101 
102 	fd = open(path, O_RDONLY | O_NOFOLLOW);
103 	if (fd == -1) {
104 		err = got_error_from_errno();
105 		goto done;
106 	}
107 	if (flock(fd, LOCK_SH | LOCK_NB) == -1) {
108 		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
109 		    : got_error_from_errno());
110 		goto done;
111 	}
112 
113 	stat(path, &sb);
114 	*content = calloc(1, sb.st_size);
115 	if (*content == NULL) {
116 		err = got_error_from_errno();
117 		goto done;
118 	}
119 
120 	n = read(fd, *content, sb.st_size);
121 	if (n != sb.st_size) {
122 		err = (n == -1 ? got_error_from_errno() :
123 		    got_error(GOT_ERR_WORKTREE_META));
124 		goto done;
125 	}
126 	if ((*content)[sb.st_size - 1] != '\n') {
127 		err = got_error(GOT_ERR_WORKTREE_META);
128 		goto done;
129 	}
130 	(*content)[sb.st_size - 1] = '\0';
131 
132 done:
133 	if (fd != -1 && close(fd) == -1 && err == NULL)
134 		err = got_error_from_errno();
135 	free(path);
136 	if (err) {
137 		free(*content);
138 		*content = NULL;
139 	}
140 	return err;
141 }
142 
143 const struct got_error *
144 got_worktree_init(const char *path, struct got_reference *head_ref,
145     const char *prefix, struct got_repository *repo)
146 {
147 	const struct got_error *err = NULL;
148 	struct got_object_id *commit_id = NULL;
149 	int obj_type;
150 	char *path_got = NULL;
151 	char *refstr = NULL;
152 	char *repo_path = NULL;
153 	char *formatstr = NULL;
154 	char *absprefix = NULL;
155 	char *basestr = NULL;
156 
157 	err = got_ref_resolve(&commit_id, repo, head_ref);
158 	if (err)
159 		return err;
160 	err = got_object_get_type(&obj_type, repo, commit_id);
161 	if (err)
162 		return err;
163 	if (obj_type != GOT_OBJ_TYPE_COMMIT)
164 		return got_error(GOT_ERR_OBJ_TYPE);
165 
166 	if (!got_path_is_absolute(prefix)) {
167 		if (asprintf(&absprefix, "/%s", prefix) == -1)
168 			return got_error_from_errno();
169 	}
170 
171 	/* Create top-level directory (may already exist). */
172 	if (mkdir(path, GOT_DEFAULT_DIR_MODE) == -1 && errno != EEXIST) {
173 		err = got_error_from_errno();
174 		goto done;
175 	}
176 
177 	/* Create .got directory (may already exist). */
178 	if (asprintf(&path_got, "%s/%s", path, GOT_WORKTREE_GOT_DIR) == -1) {
179 		err = got_error_from_errno();
180 		goto done;
181 	}
182 	if (mkdir(path_got, GOT_DEFAULT_DIR_MODE) == -1 && errno != EEXIST) {
183 		err = got_error_from_errno();
184 		goto done;
185 	}
186 
187 	/* Create an empty lock file. */
188 	err = create_meta_file(path_got, GOT_WORKTREE_LOCK, NULL);
189 	if (err)
190 		goto done;
191 
192 	/* Create an empty file index. */
193 	err = create_meta_file(path_got, GOT_WORKTREE_FILE_INDEX, NULL);
194 	if (err)
195 		goto done;
196 
197 	/* Write the HEAD reference. */
198 	refstr = got_ref_to_str(head_ref);
199 	if (refstr == NULL) {
200 		err = got_error_from_errno();
201 		goto done;
202 	}
203 	err = create_meta_file(path_got, GOT_WORKTREE_HEAD_REF, refstr);
204 	if (err)
205 		goto done;
206 
207 	/* Record our base commit. */
208 	err = got_object_id_str(&basestr, commit_id);
209 	if (err)
210 		goto done;
211 	err = create_meta_file(path_got, GOT_WORKTREE_BASE_COMMIT, basestr);
212 	if (err)
213 		goto done;
214 
215 	/* Store path to repository. */
216 	repo_path = got_repo_get_path(repo);
217 	if (repo_path == NULL) {
218 		err = got_error_from_errno();
219 		goto done;
220 	}
221 	err = create_meta_file(path_got, GOT_WORKTREE_REPOSITORY, repo_path);
222 	if (err)
223 		goto done;
224 
225 	/* Store in-repository path prefix. */
226 	err = create_meta_file(path_got, GOT_WORKTREE_PATH_PREFIX,
227 	    absprefix ? absprefix : prefix);
228 	if (err)
229 		goto done;
230 
231 	/* Stamp work tree with format file. */
232 	if (asprintf(&formatstr, "%d", GOT_WORKTREE_FORMAT_VERSION) == -1) {
233 		err = got_error_from_errno();
234 		goto done;
235 	}
236 	err = create_meta_file(path_got, GOT_WORKTREE_FORMAT, formatstr);
237 	if (err)
238 		goto done;
239 
240 done:
241 	free(commit_id);
242 	free(path_got);
243 	free(formatstr);
244 	free(refstr);
245 	free(repo_path);
246 	free(absprefix);
247 	free(basestr);
248 	return err;
249 }
250 
251 const struct got_error *
252 got_worktree_open(struct got_worktree **worktree, const char *path)
253 {
254 	const struct got_error *err = NULL;
255 	char *path_got;
256 	char *formatstr = NULL;
257 	char *path_lock = NULL;
258 	char *base_commit_id_str = NULL;
259 	char *head_ref_str = NULL;
260 	int version, fd = -1;
261 	const char *errstr;
262 	struct got_repository *repo = NULL;
263 
264 	*worktree = NULL;
265 
266 	if (asprintf(&path_got, "%s/%s", path, GOT_WORKTREE_GOT_DIR) == -1) {
267 		err = got_error_from_errno();
268 		path_got = NULL;
269 		goto done;
270 	}
271 
272 	if (asprintf(&path_lock, "%s/%s", path_got, GOT_WORKTREE_LOCK) == -1) {
273 		err = got_error_from_errno();
274 		path_lock = NULL;
275 		goto done;
276 	}
277 
278 	fd = open(path_lock, O_RDWR | O_EXLOCK | O_NONBLOCK);
279 	if (fd == -1) {
280 		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
281 		    : got_error_from_errno());
282 		goto done;
283 	}
284 
285 	err = read_meta_file(&formatstr, path_got, GOT_WORKTREE_FORMAT);
286 	if (err)
287 		goto done;
288 
289 	version = strtonum(formatstr, 1, INT_MAX, &errstr);
290 	if (errstr) {
291 		err = got_error(GOT_ERR_WORKTREE_META);
292 		goto done;
293 	}
294 	if (version != GOT_WORKTREE_FORMAT_VERSION) {
295 		err = got_error(GOT_ERR_WORKTREE_VERS);
296 		goto done;
297 	}
298 
299 	*worktree = calloc(1, sizeof(**worktree));
300 	if (*worktree == NULL) {
301 		err = got_error_from_errno();
302 		goto done;
303 	}
304 	(*worktree)->lockfd = -1;
305 
306 	(*worktree)->root_path = strdup(path);
307 	if ((*worktree)->root_path == NULL) {
308 		err = got_error_from_errno();
309 		goto done;
310 	}
311 	err = read_meta_file(&(*worktree)->repo_path, path_got,
312 	    GOT_WORKTREE_REPOSITORY);
313 	if (err)
314 		goto done;
315 
316 	err = read_meta_file(&(*worktree)->path_prefix, path_got,
317 	    GOT_WORKTREE_PATH_PREFIX);
318 	if (err)
319 		goto done;
320 
321 	err = read_meta_file(&base_commit_id_str, path_got,
322 	    GOT_WORKTREE_BASE_COMMIT);
323 	if (err)
324 		goto done;
325 
326 	err = got_repo_open(&repo, (*worktree)->repo_path);
327 	if (err)
328 		goto done;
329 
330 	err = got_object_resolve_id_str(&(*worktree)->base_commit_id, repo,
331 	    base_commit_id_str);
332 	if (err)
333 		goto done;
334 
335 	err = read_meta_file(&head_ref_str, path_got, GOT_WORKTREE_HEAD_REF);
336 	if (err)
337 		goto done;
338 
339 	err = got_ref_open(&(*worktree)->head_ref, repo, head_ref_str);
340 done:
341 	if (repo)
342 		got_repo_close(repo);
343 	free(path_got);
344 	free(path_lock);
345 	free(head_ref_str);
346 	free(base_commit_id_str);
347 	if (err) {
348 		if (fd != -1)
349 			close(fd);
350 		if (*worktree != NULL)
351 			got_worktree_close(*worktree);
352 		*worktree = NULL;
353 	} else
354 		(*worktree)->lockfd = fd;
355 
356 	return err;
357 }
358 
359 void
360 got_worktree_close(struct got_worktree *worktree)
361 {
362 	free(worktree->root_path);
363 	free(worktree->repo_path);
364 	free(worktree->path_prefix);
365 	free(worktree->base_commit_id);
366 	if (worktree->head_ref)
367 		got_ref_close(worktree->head_ref);
368 	if (worktree->lockfd != -1)
369 		close(worktree->lockfd);
370 	free(worktree);
371 }
372 
373 char *
374 got_worktree_get_repo_path(struct got_worktree *worktree)
375 {
376 	return strdup(worktree->repo_path);
377 }
378 
379 char *
380 got_worktree_get_head_ref_name(struct got_worktree *worktree)
381 {
382 	return got_ref_to_str(worktree->head_ref);
383 }
384 
385 static const struct got_error *
386 lock_worktree(struct got_worktree *worktree, int operation)
387 {
388 	if (flock(worktree->lockfd, operation | LOCK_NB) == -1)
389 		return (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
390 		    : got_error_from_errno());
391 	return NULL;
392 }
393 
394 static const char *
395 apply_path_prefix(struct got_worktree *worktree, const char *path)
396 {
397 	const char *p = path;
398 	p += strlen(worktree->path_prefix);
399 	if (*p == '/')
400 		p++;
401 	return p;
402 }
403 
404 static const struct got_error *
405 add_file_on_disk(struct got_worktree *worktree, struct got_fileindex *fileindex,
406    const char *path, struct got_blob_object *blob, struct got_repository *repo)
407 {
408 	const struct got_error *err = NULL;
409 	char *ondisk_path;
410 	int fd;
411 	size_t len, hdrlen;
412 	struct got_fileindex_entry *entry;
413 
414 	if (asprintf(&ondisk_path, "%s/%s", worktree->root_path,
415 	    apply_path_prefix(worktree, path)) == -1)
416 		return got_error_from_errno();
417 
418 	fd = open(ondisk_path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW,
419 	    GOT_DEFAULT_FILE_MODE);
420 	if (fd == -1) {
421 		err = got_error_from_errno();
422 		if (errno == EEXIST) {
423 			struct stat sb;
424 			if (lstat(ondisk_path, &sb) == -1) {
425 				err = got_error_from_errno();
426 			} else if (!S_ISREG(sb.st_mode)) {
427 				/* TODO file is obstructed; do something */
428 				err = got_error(GOT_ERR_FILE_OBSTRUCTED);
429 			}
430 		}
431 		return err;
432 	}
433 
434 	hdrlen = got_object_blob_get_hdrlen(blob);
435 	do {
436 		const uint8_t *buf = got_object_blob_get_read_buf(blob);
437 		err = got_object_blob_read_block(&len, blob);
438 		if (err)
439 			break;
440 		if (len > 0) {
441 			/* Skip blob object header first time around. */
442 			ssize_t outlen = write(fd, buf + hdrlen, len - hdrlen);
443 			if (outlen == -1) {
444 				err = got_error_from_errno();
445 				goto done;
446 			} else if (outlen != len - hdrlen) {
447 				err = got_error(GOT_ERR_IO);
448 				goto done;
449 			}
450 			hdrlen = 0;
451 		}
452 	} while (len != 0);
453 
454 	fsync(fd);
455 
456 	entry = got_fileindex_entry_get(fileindex,
457 	    apply_path_prefix(worktree, path));
458 	if (entry)
459 		err = got_fileindex_entry_update(entry, ondisk_path,
460 		    blob->id.sha1, worktree->base_commit_id->sha1);
461 	else {
462 		err = got_fileindex_entry_alloc(&entry, ondisk_path,
463 		    apply_path_prefix(worktree, path), blob->id.sha1,
464 		    worktree->base_commit_id->sha1);
465 		if (err)
466 			goto done;
467 		err = got_fileindex_entry_add(fileindex, entry);
468 	}
469 	if (err)
470 		goto done;
471 done:
472 	close(fd);
473 	free(ondisk_path);
474 	return err;
475 }
476 
477 static const struct got_error *
478 add_dir_on_disk(struct got_worktree *worktree, const char *path)
479 {
480 	const struct got_error *err = NULL;
481 	char *abspath;
482 
483 	if (asprintf(&abspath, "%s/%s", worktree->root_path,
484 	    apply_path_prefix(worktree, path)) == -1)
485 		return got_error_from_errno();
486 
487 	/* XXX queue work rather than editing disk directly? */
488 	if (mkdir(abspath, GOT_DEFAULT_DIR_MODE) == -1) {
489 		struct stat sb;
490 
491 		if (errno != EEXIST) {
492 			err = got_error_from_errno();
493 			goto done;
494 		}
495 
496 		if (lstat(abspath, &sb) == -1) {
497 			err = got_error_from_errno();
498 			goto done;
499 		}
500 
501 		if (!S_ISDIR(sb.st_mode)) {
502 			/* TODO directory is obstructed; do something */
503 			return got_error(GOT_ERR_FILE_OBSTRUCTED);
504 		}
505 	}
506 
507 done:
508 	free(abspath);
509 	return err;
510 }
511 
512 static const struct got_error *
513 tree_checkout(struct got_worktree *, struct got_fileindex *,
514     struct got_tree_object *, const char *, struct got_repository *,
515     got_worktree_checkout_cb progress_cb, void *progress_arg,
516     got_worktree_cancel_cb cancel_cb, void *cancel_arg);
517 
518 static const struct got_error *
519 tree_checkout_entry(struct got_worktree *worktree,
520     struct got_fileindex *fileindex, struct got_tree_entry *te,
521     const char *parent, struct got_repository *repo,
522     got_worktree_checkout_cb progress_cb, void *progress_arg,
523     got_worktree_cancel_cb cancel_cb, void *cancel_arg)
524 {
525 	const struct got_error *err = NULL;
526 	struct got_object *obj = NULL;
527 	struct got_blob_object *blob = NULL;
528 	struct got_tree_object *tree = NULL;
529 	char *path = NULL;
530 	char *progress_path = NULL;
531 	size_t len;
532 
533 	if (parent[0] == '/' && parent[1] == '\0')
534 		parent = "";
535 	if (asprintf(&path, "%s/%s", parent, te->name) == -1)
536 		return got_error_from_errno();
537 
538 	/* Skip this entry if it is outside of our path prefix. */
539 	len = MIN(strlen(worktree->path_prefix), strlen(path));
540 	if (strncmp(path, worktree->path_prefix, len) != 0) {
541 		free(path);
542 		return NULL;
543 	}
544 
545 	err = got_object_open(&obj, repo, te->id);
546 	if (err)
547 		goto done;
548 
549 	progress_path = path;
550 	if (strncmp(progress_path, worktree->path_prefix, len) == 0)
551 		progress_path += len;
552 	(*progress_cb)(progress_arg, progress_path);
553 
554 	switch (obj->type) {
555 	case GOT_OBJ_TYPE_BLOB:
556 		if (strlen(worktree->path_prefix) >= strlen(path))
557 			break;
558 		err = got_object_blob_open(&blob, repo, obj, 8192);
559 		if (err)
560 			goto done;
561 		err = add_file_on_disk(worktree, fileindex, path, blob, repo);
562 		break;
563 	case GOT_OBJ_TYPE_TREE:
564 		err = got_object_tree_open(&tree, repo, obj);
565 		if (err)
566 			goto done;
567 		if (strlen(worktree->path_prefix) < strlen(path)) {
568 			err = add_dir_on_disk(worktree, path);
569 			if (err)
570 				break;
571 		}
572 		/* XXX infinite recursion possible */
573 		err = tree_checkout(worktree, fileindex, tree, path, repo,
574 		    progress_cb, progress_arg, cancel_cb, cancel_arg);
575 		break;
576 	default:
577 		break;
578 	}
579 
580 done:
581 	if (blob)
582 		got_object_blob_close(blob);
583 	if (tree)
584 		got_object_tree_close(tree);
585 	if (obj)
586 		got_object_close(obj);
587 	free(path);
588 	return err;
589 }
590 
591 static const struct got_error *
592 tree_checkout(struct got_worktree *worktree,
593     struct got_fileindex *fileindex, struct got_tree_object *tree,
594     const char *path, struct got_repository *repo,
595     got_worktree_checkout_cb progress_cb, void *progress_arg,
596     got_worktree_cancel_cb cancel_cb, void *cancel_arg)
597 {
598 	const struct got_error *err = NULL;
599 	const struct got_tree_entries *entries;
600 	struct got_tree_entry *te;
601 	size_t len;
602 
603 	/* Skip this tree if it is outside of our path prefix. */
604 	len = MIN(strlen(worktree->path_prefix), strlen(path));
605 	if (strncmp(path, worktree->path_prefix, len) != 0)
606 		return NULL;
607 
608 	entries = got_object_tree_get_entries(tree);
609 	SIMPLEQ_FOREACH(te, &entries->head, entry) {
610 		if (cancel_cb) {
611 			err = (*cancel_cb)(cancel_arg);
612 			if (err)
613 				break;
614 		}
615 		err = tree_checkout_entry(worktree, fileindex, te, path, repo,
616 		    progress_cb, progress_arg, cancel_cb, cancel_arg);
617 		if (err)
618 			break;
619 	}
620 
621 	return err;
622 }
623 
624 const struct got_error *
625 got_worktree_checkout_files(struct got_worktree *worktree,
626     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
627     void *progress_arg, got_worktree_cancel_cb cancel_cb, void *cancel_arg)
628 {
629 	const struct got_error *err = NULL, *unlockerr, *checkout_err = NULL;
630 	struct got_commit_object *commit = NULL;
631 	struct got_tree_object *tree = NULL;
632 	char *fileindex_path = NULL, *new_fileindex_path = NULL;
633 	struct got_fileindex *fileindex = NULL;
634 	FILE *index = NULL, *new_index = NULL;
635 
636 	err = lock_worktree(worktree, LOCK_EX);
637 	if (err)
638 		return err;
639 
640 	fileindex = got_fileindex_alloc();
641 	if (fileindex == NULL) {
642 		err = got_error_from_errno();
643 		goto done;
644 	}
645 
646 	if (asprintf(&fileindex_path, "%s/%s/%s", worktree->root_path,
647 	    GOT_WORKTREE_GOT_DIR, GOT_WORKTREE_FILE_INDEX) == -1) {
648 		err = got_error_from_errno();
649 		fileindex_path = NULL;
650 		goto done;
651 	}
652 
653 	/*
654 	 * Read the file index.
655 	 * Checking out files is supposed to be an idempotent operation.
656 	 * If the on-disk file index is incomplete we will try to complete it.
657 	 */
658 	index = fopen(fileindex_path, "rb");
659 	if (index == NULL) {
660 		err = got_error_from_errno();
661 		goto done;
662 	}
663 	err = got_fileindex_read(fileindex, index);
664 	fclose(index);
665 	if (err)
666 		goto done;
667 
668 	err = got_opentemp_named(&new_fileindex_path, &new_index,
669 	    fileindex_path);
670 	if (err)
671 		goto done;
672 
673 	err = got_object_open_as_commit(&commit, repo,
674 	   worktree->base_commit_id);
675 	if (err)
676 		goto done;
677 
678 	err = got_object_open_as_tree(&tree, repo, commit->tree_id);
679 	if (err)
680 		goto done;
681 
682 	checkout_err = tree_checkout(worktree, fileindex, tree, "/", repo,
683 	    progress_cb, progress_arg, cancel_cb, cancel_arg);
684 
685 	/* Try to sync the fileindex back to disk in any case. */
686 	err = got_fileindex_write(fileindex, new_index);
687 	if (err)
688 		goto done;
689 
690 	if (rename(new_fileindex_path, fileindex_path) != 0) {
691 		err = got_error_from_errno();
692 		goto done;
693 	}
694 
695 	free(new_fileindex_path);
696 	new_fileindex_path = NULL;
697 
698 done:
699 	if (tree)
700 		got_object_tree_close(tree);
701 	if (commit)
702 		got_object_commit_close(commit);
703 	if (new_fileindex_path)
704 		unlink(new_fileindex_path);
705 	if (new_index)
706 		fclose(new_index);
707 	free(new_fileindex_path);
708 	free(fileindex_path);
709 	got_fileindex_free(fileindex);
710 	if (checkout_err)
711 		err = checkout_err;
712 	unlockerr = lock_worktree(worktree, LOCK_SH);
713 	if (unlockerr && err == NULL)
714 		err = unlockerr;
715 	return err;
716 }