summaryrefslogtreecommitdiff
path: root/builtin/worktree.c
blob: 24f22800f38c759d123d7e307de488f0c8ee852f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
#include "cache.h"
#include "checkout.h"
#include "config.h"
#include "builtin.h"
#include "dir.h"
#include "parse-options.h"
#include "argv-array.h"
#include "branch.h"
#include "refs.h"
#include "run-command.h"
#include "sigchain.h"
#include "submodule.h"
#include "utf8.h"
#include "worktree.h"
 
static const char * const worktree_usage[] = {
	N_("git worktree add [<options>] <path> [<commit-ish>]"),
	N_("git worktree list [<options>]"),
	N_("git worktree lock [<options>] <path>"),
	N_("git worktree move <worktree> <new-path>"),
	N_("git worktree prune [<options>]"),
	N_("git worktree remove [<options>] <worktree>"),
	N_("git worktree unlock <path>"),
	NULL
};
 
struct add_opts {
	int force;
	int detach;
	int quiet;
	int checkout;
	int keep_locked;
};
 
static int show_only;
static int verbose;
static int guess_remote;
static timestamp_t expire;
 
static int git_worktree_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "worktree.guessremote")) {
		guess_remote = git_config_bool(var, value);
		return 0;
	}
 
	return git_default_config(var, value, cb);
}
 
static int delete_git_dir(const char *id)
{
	struct strbuf sb = STRBUF_INIT;
	int ret;
 
	strbuf_addstr(&sb, git_common_path("worktrees/%s", id));
	ret = remove_dir_recursively(&sb, 0);
	if (ret < 0 && errno == ENOTDIR)
		ret = unlink(sb.buf);
	if (ret)
		error_errno(_("failed to delete '%s'"), sb.buf);
	strbuf_release(&sb);
	return ret;
}
 
static void delete_worktrees_dir_if_empty(void)
{
	rmdir(git_path("worktrees")); /* ignore failed removal */
}
 
static int prune_worktree(const char *id, struct strbuf *reason)
{
	struct stat st;
	char *path;
	int fd;
	size_t len;
	ssize_t read_result;
 
	if (!is_directory(git_path("worktrees/%s", id))) {
		strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
		return 1;
	}
	if (file_exists(git_path("worktrees/%s/locked", id)))
		return 0;
	if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
		strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
		return 1;
	}
	fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
	if (fd < 0) {
		strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
			    id, strerror(errno));
		return 1;
	}
	len = xsize_t(st.st_size);
	path = xmallocz(len);
 
	read_result = read_in_full(fd, path, len);
	if (read_result < 0) {
		strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
			    id, strerror(errno));
		close(fd);
		free(path);
		return 1;
	}
	close(fd);
 
	if (read_result != len) {
		strbuf_addf(reason,
			    _("Removing worktrees/%s: short read (expected %"PRIuMAX" bytes, read %"PRIuMAX")"),
			    id, (uintmax_t)len, (uintmax_t)read_result);
		free(path);
		return 1;
	}
	while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
		len--;
	if (!len) {
		strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
		free(path);
		return 1;
	}
	path[len] = '\0';
	if (!file_exists(path)) {
		free(path);
		if (stat(git_path("worktrees/%s/index", id), &st) ||
		    st.st_mtime <= expire) {
			strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
			return 1;
		} else {
			return 0;
		}
	}
	free(path);
	return 0;
}
 
static void prune_worktrees(void)
{
	struct strbuf reason = STRBUF_INIT;
	DIR *dir = opendir(git_path("worktrees"));
	struct dirent *d;
	if (!dir)
		return;
	while ((d = readdir(dir)) != NULL) {
		if (is_dot_or_dotdot(d->d_name))
			continue;
		strbuf_reset(&reason);
		if (!prune_worktree(d->d_name, &reason))
			continue;
		if (show_only || verbose)
			printf("%s\n", reason.buf);
		if (show_only)
			continue;
		delete_git_dir(d->d_name);
	}
	closedir(dir);
	if (!show_only)
		delete_worktrees_dir_if_empty();
	strbuf_release(&reason);
}
 
static int prune(int ac, const char **av, const char *prefix)
{
	struct option options[] = {
		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
		OPT__VERBOSE(&verbose, N_("report pruned working trees")),
		OPT_EXPIRY_DATE(0, "expire", &expire,
				N_("expire working trees older than <time>")),
		OPT_END()
	};
 
	expire = TIME_MAX;
	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
	if (ac)
		usage_with_options(worktree_usage, options);
	prune_worktrees();
	return 0;
}
 
static char *junk_work_tree;
static char *junk_git_dir;
static int is_junk;
static pid_t junk_pid;
 
static void remove_junk(void)
{
	struct strbuf sb = STRBUF_INIT;
	if (!is_junk || getpid() != junk_pid)
		return;
	if (junk_git_dir) {
		strbuf_addstr(&sb, junk_git_dir);
		remove_dir_recursively(&sb, 0);
		strbuf_reset(&sb);
	}
	if (junk_work_tree) {
		strbuf_addstr(&sb, junk_work_tree);
		remove_dir_recursively(&sb, 0);
	}
	strbuf_release(&sb);
}
 
static void remove_junk_on_signal(int signo)
{
	remove_junk();
	sigchain_pop(signo);
	raise(signo);
}
 
static const char *worktree_basename(const char *path, int *olen)
{
	const char *name;
	int len;
 
	len = strlen(path);
	while (len && is_dir_sep(path[len - 1]))
		len--;
 
	for (name = path + len - 1; name > path; name--)
		if (is_dir_sep(*name)) {
			name++;
			break;
		}
 
	*olen = len;
	return name;
}
 
static void validate_worktree_add(const char *path, const struct add_opts *opts)
{
	struct worktree **worktrees;
	struct worktree *wt;
	int locked;
 
	if (file_exists(path) && !is_empty_dir(path))
		die(_("'%s' already exists"), path);
 
	worktrees = get_worktrees(0);
	wt = find_worktree_by_path(worktrees, path);
	if (!wt)
		goto done;
 
	locked = !!worktree_lock_reason(wt);
	if ((!locked && opts->force) || (locked && opts->force > 1)) {
		if (delete_git_dir(wt->id))
		    die(_("unable to re-add worktree '%s'"), path);
		goto done;
	}
 
	if (locked)
		die(_("'%s' is a missing but locked worktree;\nuse 'add -f -f' to override, or 'unlock' and 'prune' or 'remove' to clear"), path);
	else
		die(_("'%s' is a missing but already registered worktree;\nuse 'add -f' to override, or 'prune' or 'remove' to clear"), path);
 
done:
	free_worktrees(worktrees);
}
 
static int add_worktree(const char *path, const char *refname,
			const struct add_opts *opts)
{
	struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
	struct strbuf sb = STRBUF_INIT;
	const char *name;
	struct child_process cp = CHILD_PROCESS_INIT;
	struct argv_array child_env = ARGV_ARRAY_INIT;
	unsigned int counter = 0;
	int len, ret;
	struct strbuf symref = STRBUF_INIT;
	struct commit *commit = NULL;
	int is_branch = 0;
	struct strbuf sb_name = STRBUF_INIT;
 
	validate_worktree_add(path, opts);
 
	/* is 'refname' a branch or commit? */
	if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
	    ref_exists(symref.buf)) {
		is_branch = 1;
		if (!opts->force)
			die_if_checked_out(symref.buf, 0);
	}
	commit = lookup_commit_reference_by_name(refname);
	if (!commit)
		die(_("invalid reference: %s"), refname);
 
	name = worktree_basename(path, &len);
	strbuf_add(&sb, name, path + len - name);
	sanitize_refname_component(sb.buf, &sb_name);
	if (!sb_name.len)
		BUG("How come '%s' becomes empty after sanitization?", sb.buf);
	strbuf_reset(&sb);
	name = sb_name.buf;
	git_path_buf(&sb_repo, "worktrees/%s", name);
	len = sb_repo.len;
	if (safe_create_leading_directories_const(sb_repo.buf))
		die_errno(_("could not create leading directories of '%s'"),
			  sb_repo.buf);
 
	while (mkdir(sb_repo.buf, 0777)) {
		counter++;
		if ((errno != EEXIST) || !counter /* overflow */)
			die_errno(_("could not create directory of '%s'"),
				  sb_repo.buf);
		strbuf_setlen(&sb_repo, len);
		strbuf_addf(&sb_repo, "%d", counter);
	}
	name = strrchr(sb_repo.buf, '/') + 1;
 
	junk_pid = getpid();
	atexit(remove_junk);
	sigchain_push_common(remove_junk_on_signal);
 
	junk_git_dir = xstrdup(sb_repo.buf);
	is_junk = 1;
 
	/*
	 * lock the incomplete repo so prune won't delete it, unlock
	 * after the preparation is over.
	 */
	strbuf_addf(&sb, "%s/locked", sb_repo.buf);
	if (!opts->keep_locked)
		write_file(sb.buf, "initializing");
	else
		write_file(sb.buf, "added with --lock");
 
	strbuf_addf(&sb_git, "%s/.git", path);
	if (safe_create_leading_directories_const(sb_git.buf))
		die_errno(_("could not create leading directories of '%s'"),
			  sb_git.buf);
	junk_work_tree = xstrdup(path);
 
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
	write_file(sb.buf, "%s", real_path(sb_git.buf));
	write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
		   real_path(get_git_common_dir()), name);
	/*
	 * This is to keep resolve_ref() happy. We need a valid HEAD
	 * or is_git_directory() will reject the directory. Any value which
	 * looks like an object ID will do since it will be immediately
	 * replaced by the symbolic-ref or update-ref invocation in the new
	 * worktree.
	 */
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
	write_file(sb.buf, "%s", oid_to_hex(&null_oid));
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
	write_file(sb.buf, "../..");
 
	argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
	argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
	cp.git_cmd = 1;
 
	if (!is_branch)
		argv_array_pushl(&cp.args, "update-ref", "HEAD",
				 oid_to_hex(&commit->object.oid), NULL);
	else {
		argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
				 symref.buf, NULL);
		if (opts->quiet)
			argv_array_push(&cp.args, "--quiet");
	}
 
	cp.env = child_env.argv;
	ret = run_command(&cp);
	if (ret)
		goto done;
 
	if (opts->checkout) {
		cp.argv = NULL;
		argv_array_clear(&cp.args);
		argv_array_pushl(&cp.args, "reset", "--hard", "--no-recurse-submodules", NULL);
		if (opts->quiet)
			argv_array_push(&cp.args, "--quiet");
		cp.env = child_env.argv;
		ret = run_command(&cp);
		if (ret)
			goto done;
	}
 
	is_junk = 0;
	FREE_AND_NULL(junk_work_tree);
	FREE_AND_NULL(junk_git_dir);
 
done:
	if (ret || !opts->keep_locked) {
		strbuf_reset(&sb);
		strbuf_addf(&sb, "%s/locked", sb_repo.buf);
		unlink_or_warn(sb.buf);
	}
 
	/*
	 * Hook failure does not warrant worktree deletion, so run hook after
	 * is_junk is cleared, but do return appropriate code when hook fails.
	 */
	if (!ret && opts->checkout) {
		const char *hook = find_hook("post-checkout");
		if (hook) {
			const char *env[] = { "GIT_DIR", "GIT_WORK_TREE", NULL };
			cp.git_cmd = 0;
			cp.no_stdin = 1;
			cp.stdout_to_stderr = 1;
			cp.dir = path;
			cp.env = env;
			cp.argv = NULL;
			cp.trace2_hook_name = "post-checkout";
			argv_array_pushl(&cp.args, absolute_path(hook),
					 oid_to_hex(&null_oid),
					 oid_to_hex(&commit->object.oid),
					 "1", NULL);
			ret = run_command(&cp);
		}
	}
 
	argv_array_clear(&child_env);
	strbuf_release(&sb);
	strbuf_release(&symref);
	strbuf_release(&sb_repo);
	strbuf_release(&sb_git);
	strbuf_release(&sb_name);
	return ret;
}
 
static void print_preparing_worktree_line(int detach,
					  const char *branch,
					  const char *new_branch,
					  int force_new_branch)
{
	if (force_new_branch) {
		struct commit *commit = lookup_commit_reference_by_name(new_branch);
		if (!commit)
			printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
		else
			printf_ln(_("Preparing worktree (resetting branch '%s'; was at %s)"),
				  new_branch,
				  find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
	} else if (new_branch) {
		printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
	} else {
		struct strbuf s = STRBUF_INIT;
		if (!detach && !strbuf_check_branch_ref(&s, branch) &&
		    ref_exists(s.buf))
			printf_ln(_("Preparing worktree (checking out '%s')"),
				  branch);
		else {
			struct commit *commit = lookup_commit_reference_by_name(branch);
			if (!commit)
				die(_("invalid reference: %s"), branch);
			printf_ln(_("Preparing worktree (detached HEAD %s)"),
				  find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
		}
		strbuf_release(&s);
	}
}
 
static const char *dwim_branch(const char *path, const char **new_branch)
{
	int n;
	const char *s = worktree_basename(path, &n);
	const char *branchname = xstrndup(s, n);
	struct strbuf ref = STRBUF_INIT;
 
	UNLEAK(branchname);
	if (!strbuf_check_branch_ref(&ref, branchname) &&
	    ref_exists(ref.buf)) {
		strbuf_release(&ref);
		return branchname;
	}
 
	*new_branch = branchname;
	if (guess_remote) {
		struct object_id oid;
		const char *remote =
			unique_tracking_name(*new_branch, &oid, NULL);
		return remote;
	}
	return NULL;
}
 
static int add(int ac, const char **av, const char *prefix)
{
	struct add_opts opts;
	const char *new_branch_force = NULL;
	char *path;
	const char *branch;
	const char *new_branch = NULL;
	const char *opt_track = NULL;
	struct option options[] = {
		OPT__FORCE(&opts.force,
			   N_("checkout <branch> even if already checked out in other worktree"),
			   PARSE_OPT_NOCOMPLETE),
		OPT_STRING('b', NULL, &new_branch, N_("branch"),
			   N_("create a new branch")),
		OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
			   N_("create or reset a branch")),
		OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
		OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
		OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
		OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
		OPT_PASSTHRU(0, "track", &opt_track, NULL,
			     N_("set up tracking mode (see git-branch(1))"),
			     PARSE_OPT_NOARG | PARSE_OPT_OPTARG),
		OPT_BOOL(0, "guess-remote", &guess_remote,
			 N_("try to match the new branch name with a remote-tracking branch")),
		OPT_END()
	};
 
	memset(&opts, 0, sizeof(opts));
	opts.checkout = 1;
	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
	if (!!opts.detach + !!new_branch + !!new_branch_force > 1)
		die(_("-b, -B, and --detach are mutually exclusive"));
	if (ac < 1 || ac > 2)
		usage_with_options(worktree_usage, options);
 
	path = prefix_filename(prefix, av[0]);
	branch = ac < 2 ? "HEAD" : av[1];
 
	if (!strcmp(branch, "-"))
		branch = "@{-1}";
 
	if (new_branch_force) {
		struct strbuf symref = STRBUF_INIT;
 
		new_branch = new_branch_force;
 
		if (!opts.force &&
		    !strbuf_check_branch_ref(&symref, new_branch) &&
		    ref_exists(symref.buf))
			die_if_checked_out(symref.buf, 0);
		strbuf_release(&symref);
	}
 
	if (ac < 2 && !new_branch && !opts.detach) {
		const char *s = dwim_branch(path, &new_branch);
		if (s)
			branch = s;
	}
 
	if (ac == 2 && !new_branch && !opts.detach) {
		struct object_id oid;
		struct commit *commit;
		const char *remote;
 
		commit = lookup_commit_reference_by_name(branch);
		if (!commit) {
			remote = unique_tracking_name(branch, &oid, NULL);
			if (remote) {
				new_branch = branch;
				branch = remote;
			}
		}
	}
	if (!opts.quiet)
		print_preparing_worktree_line(opts.detach, branch, new_branch, !!new_branch_force);
 
	if (new_branch) {
		struct child_process cp = CHILD_PROCESS_INIT;
		cp.git_cmd = 1;
		argv_array_push(&cp.args, "branch");
		if (new_branch_force)
			argv_array_push(&cp.args, "--force");
		if (opts.quiet)
			argv_array_push(&cp.args, "--quiet");
		argv_array_push(&cp.args, new_branch);
		argv_array_push(&cp.args, branch);
		if (opt_track)
			argv_array_push(&cp.args, opt_track);
		if (run_command(&cp))
			return -1;
		branch = new_branch;
	} else if (opt_track) {
		die(_("--[no-]track can only be used if a new branch is created"));
	}
 
	UNLEAK(path);
	UNLEAK(opts);
	return add_worktree(path, branch, &opts);
}
 
static void show_worktree_porcelain(struct worktree *wt)
{
	printf("worktree %s\n", wt->path);
	if (wt->is_bare)
		printf("bare\n");
	else {
		printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
		if (wt->is_detached)
			printf("detached\n");
		else if (wt->head_ref)
			printf("branch %s\n", wt->head_ref);
	}
	printf("\n");
}
 
static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
{
	struct strbuf sb = STRBUF_INIT;
	int cur_path_len = strlen(wt->path);
	int path_adj = cur_path_len - utf8_strwidth(wt->path);
 
	strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
	if (wt->is_bare)
		strbuf_addstr(&sb, "(bare)");
	else {
		strbuf_addf(&sb, "%-*s ", abbrev_len,
				find_unique_abbrev(&wt->head_oid, DEFAULT_ABBREV));
		if (wt->is_detached)
			strbuf_addstr(&sb, "(detached HEAD)");
		else if (wt->head_ref) {
			char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
			strbuf_addf(&sb, "[%s]", ref);
			free(ref);
		} else
			strbuf_addstr(&sb, "(error)");
	}
	printf("%s\n", sb.buf);
 
	strbuf_release(&sb);
}
 
static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
{
	int i;
 
	for (i = 0; wt[i]; i++) {
		int sha1_len;
		int path_len = strlen(wt[i]->path);
 
		if (path_len > *maxlen)
			*maxlen = path_len;
		sha1_len = strlen(find_unique_abbrev(&wt[i]->head_oid, *abbrev));
		if (sha1_len > *abbrev)
			*abbrev = sha1_len;
	}
}
 
static int list(int ac, const char **av, const char *prefix)
{
	int porcelain = 0;
 
	struct option options[] = {
		OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
		OPT_END()
	};
 
	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
	if (ac)
		usage_with_options(worktree_usage, options);
	else {
		struct worktree **worktrees = get_worktrees(GWT_SORT_LINKED);
		int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 
		if (!porcelain)
			measure_widths(worktrees, &abbrev, &path_maxlen);
 
		for (i = 0; worktrees[i]; i++) {
			if (porcelain)
				show_worktree_porcelain(worktrees[i]);
			else
				show_worktree(worktrees[i], path_maxlen, abbrev);
		}
		free_worktrees(worktrees);
	}
	return 0;
}
 
static int lock_worktree(int ac, const char **av, const char *prefix)
{
	const char *reason = "", *old_reason;
	struct option options[] = {
		OPT_STRING(0, "reason", &reason, N_("string"),
			   N_("reason for locking")),
		OPT_END()
	};
	struct worktree **worktrees, *wt;
 
	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
	if (ac != 1)
		usage_with_options(worktree_usage, options);
 
	worktrees = get_worktrees(0);
	wt = find_worktree(worktrees, prefix, av[0]);
	if (!wt)
		die(_("'%s' is not a working tree"), av[0]);
	if (is_main_worktree(wt))
		die(_("The main working tree cannot be locked or unlocked"));
 
	old_reason = worktree_lock_reason(wt);
	if (old_reason) {
		if (*old_reason)
			die(_("'%s' is already locked, reason: %s"),
			    av[0], old_reason);
		die(_("'%s' is already locked"), av[0]);
	}
 
	write_file(git_common_path("worktrees/%s/locked", wt->id),
		   "%s", reason);
	free_worktrees(worktrees);
	return 0;
}
 
static int unlock_worktree(int ac, const char **av, const char *prefix)
{
	struct option options[] = {
		OPT_END()
	};
	struct worktree **worktrees, *wt;
	int ret;
 
	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
	if (ac != 1)
		usage_with_options(worktree_usage, options);
 
	worktrees = get_worktrees(0);
	wt = find_worktree(worktrees, prefix, av[0]);
	if (!wt)
		die(_("'%s' is not a working tree"), av[0]);
	if (is_main_worktree(wt))
		die(_("The main working tree cannot be locked or unlocked"));
	if (!worktree_lock_reason(wt))
		die(_("'%s' is not locked"), av[0]);
	ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
	free_worktrees(worktrees);
	return ret;
}
 
static void validate_no_submodules(const struct worktree *wt)
{
	struct index_state istate = { NULL };
	struct strbuf path = STRBUF_INIT;
	int i, found_submodules = 0;
 
	if (is_directory(worktree_git_path(wt, "modules"))) {
		/*
		 * There could be false positives, e.g. the "modules"
		 * directory exists but is empty. But it's a rare case and
		 * this simpler check is probably good enough for now.
		 */
		found_submodules = 1;
	} else if (read_index_from(&istate, worktree_git_path(wt, "index"),
				   get_worktree_git_dir(wt)) > 0) {
		for (i = 0; i < istate.cache_nr; i++) {
			struct cache_entry *ce = istate.cache[i];
			int err;
 
			if (!S_ISGITLINK(ce->ce_mode))
				continue;
 
			strbuf_reset(&path);
			strbuf_addf(&path, "%s/%s", wt->path, ce->name);
			if (!is_submodule_populated_gently(path.buf, &err))
				continue;
 
			found_submodules = 1;
			break;
		}
	}
	discard_index(&istate);
	strbuf_release(&path);
 
	if (found_submodules)
		die(_("working trees containing submodules cannot be moved or removed"));
}
 
static int move_worktree(int ac, const char **av, const char *prefix)
{
	int force = 0;
	struct option options[] = {
		OPT__FORCE(&force,
			 N_("force move even if worktree is dirty or locked"),
			 PARSE_OPT_NOCOMPLETE),
		OPT_END()
	};
	struct worktree **worktrees, *wt;
	struct strbuf dst = STRBUF_INIT;
	struct strbuf errmsg = STRBUF_INIT;
	const char *reason = NULL;
	char *path;
 
	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
	if (ac != 2)
		usage_with_options(worktree_usage, options);
 
	path = prefix_filename(prefix, av[1]);
	strbuf_addstr(&dst, path);
	free(path);
 
	worktrees = get_worktrees(0);
	wt = find_worktree(worktrees, prefix, av[0]);
	if (!wt)
		die(_("'%s' is not a working tree"), av[0]);
	if (is_main_worktree(wt))
		die(_("'%s' is a main working tree"), av[0]);
	if (is_directory(dst.buf)) {
		const char *sep = find_last_dir_sep(wt->path);
 
		if (!sep)
			die(_("could not figure out destination name from '%s'"),
			    wt->path);
		strbuf_trim_trailing_dir_sep(&dst);
		strbuf_addstr(&dst, sep);
	}
	if (file_exists(dst.buf))
		die(_("target '%s' already exists"), dst.buf);
 
	validate_no_submodules(wt);
 
	if (force < 2)
		reason = worktree_lock_reason(wt);
	if (reason) {
		if (*reason)
			die(_("cannot move a locked working tree, lock reason: %s\nuse 'move -f -f' to override or unlock first"),
			    reason);
		die(_("cannot move a locked working tree;\nuse 'move -f -f' to override or unlock first"));
	}
	if (validate_worktree(wt, &errmsg, 0))
		die(_("validation failed, cannot move working tree: %s"),
		    errmsg.buf);
	strbuf_release(&errmsg);
 
	if (rename(wt->path, dst.buf) == -1)
		die_errno(_("failed to move '%s' to '%s'"), wt->path, dst.buf);
 
	update_worktree_location(wt, dst.buf);
 
	strbuf_release(&dst);
	free_worktrees(worktrees);
	return 0;
}
 
/*
 * Note, "git status --porcelain" is used to determine if it's safe to
 * delete a whole worktree. "git status" does not ignore user
 * configuration, so if a normal "git status" shows "clean" for the
 * user, then it's ok to remove it.
 *
 * This assumption may be a bad one. We may want to ignore
 * (potentially bad) user settings and only delete a worktree when
 * it's absolutely safe to do so from _our_ point of view because we
 * know better.
 */
static void check_clean_worktree(struct worktree *wt,
				 const char *original_path)
{
	struct argv_array child_env = ARGV_ARRAY_INIT;
	struct child_process cp;
	char buf[1];
	int ret;
 
	/*
	 * Until we sort this out, all submodules are "dirty" and
	 * will abort this function.
	 */
	validate_no_submodules(wt);
 
	argv_array_pushf(&child_env, "%s=%s/.git",
			 GIT_DIR_ENVIRONMENT, wt->path);
	argv_array_pushf(&child_env, "%s=%s",
			 GIT_WORK_TREE_ENVIRONMENT, wt->path);
	memset(&cp, 0, sizeof(cp));
	argv_array_pushl(&cp.args, "status",
			 "--porcelain", "--ignore-submodules=none",
			 NULL);
	cp.env = child_env.argv;
	cp.git_cmd = 1;
	cp.dir = wt->path;
	cp.out = -1;
	ret = start_command(&cp);
	if (ret)
		die_errno(_("failed to run 'git status' on '%s'"),
			  original_path);
	ret = xread(cp.out, buf, sizeof(buf));
	if (ret)
		die(_("'%s' contains modified or untracked files, use --force to delete it"),
		    original_path);
	close(cp.out);
	ret = finish_command(&cp);
	if (ret)
		die_errno(_("failed to run 'git status' on '%s', code %d"),
			  original_path, ret);
}
 
static int delete_git_work_tree(struct worktree *wt)
{
	struct strbuf sb = STRBUF_INIT;
	int ret = 0;
 
	strbuf_addstr(&sb, wt->path);
	if (remove_dir_recursively(&sb, 0)) {
		error_errno(_("failed to delete '%s'"), sb.buf);
		ret = -1;
	}
	strbuf_release(&sb);
	return ret;
}
 
static int remove_worktree(int ac, const char **av, const char *prefix)
{
	int force = 0;
	struct option options[] = {
		OPT__FORCE(&force,
			 N_("force removal even if worktree is dirty or locked"),
			 PARSE_OPT_NOCOMPLETE),
		OPT_END()
	};
	struct worktree **worktrees, *wt;
	struct strbuf errmsg = STRBUF_INIT;
	const char *reason = NULL;
	int ret = 0;
 
	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
	if (ac != 1)
		usage_with_options(worktree_usage, options);
 
	worktrees = get_worktrees(0);
	wt = find_worktree(worktrees, prefix, av[0]);
	if (!wt)
		die(_("'%s' is not a working tree"), av[0]);
	if (is_main_worktree(wt))
		die(_("'%s' is a main working tree"), av[0]);
	if (force < 2)
		reason = worktree_lock_reason(wt);
	if (reason) {
		if (*reason)
			die(_("cannot remove a locked working tree, lock reason: %s\nuse 'remove -f -f' to override or unlock first"),
			    reason);
		die(_("cannot remove a locked working tree;\nuse 'remove -f -f' to override or unlock first"));
	}
	if (validate_worktree(wt, &errmsg, WT_VALIDATE_WORKTREE_MISSING_OK))
		die(_("validation failed, cannot remove working tree: %s"),
		    errmsg.buf);
	strbuf_release(&errmsg);
 
	if (file_exists(wt->path)) {
		if (!force)
			check_clean_worktree(wt, av[0]);
 
		ret |= delete_git_work_tree(wt);
	}
	/*
	 * continue on even if ret is non-zero, there's no going back
	 * from here.
	 */
	ret |= delete_git_dir(wt->id);
	delete_worktrees_dir_if_empty();
 
	free_worktrees(worktrees);
	return ret;
}
 
int cmd_worktree(int ac, const char **av, const char *prefix)
{
	struct option options[] = {
		OPT_END()
	};
 
	git_config(git_worktree_config, NULL);
 
	if (ac < 2)
		usage_with_options(worktree_usage, options);
	if (!prefix)
		prefix = "";
	if (!strcmp(av[1], "add"))
		return add(ac - 1, av + 1, prefix);
	if (!strcmp(av[1], "prune"))
		return prune(ac - 1, av + 1, prefix);
	if (!strcmp(av[1], "list"))
		return list(ac - 1, av + 1, prefix);
	if (!strcmp(av[1], "lock"))
		return lock_worktree(ac - 1, av + 1, prefix);
	if (!strcmp(av[1], "unlock"))
		return unlock_worktree(ac - 1, av + 1, prefix);
	if (!strcmp(av[1], "move"))
		return move_worktree(ac - 1, av + 1, prefix);
	if (!strcmp(av[1], "remove"))
		return remove_worktree(ac - 1, av + 1, prefix);
	usage_with_options(worktree_usage, options);
}