summaryrefslogtreecommitdiff
path: root/builtin/worktree.c
blob: 4e7c98758fcfb93c19e3dbf58fc3167829e998b8 (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
#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 "refs.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 prune [<options>]"),
	N_("git worktree unlock <path>"),
	NULL
};

struct add_opts {
	int force;
	int detach;
	int checkout;
	int keep_locked;
	const char *new_branch;
	int force_new_branch;
};

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 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)) {
		struct stat st_link;
		free(path);
		/*
		 * the repo is moved manually and has not been
		 * accessed since?
		 */
		if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
		    st_link.st_nlink > 1)
			return 0;
		if (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;
	struct strbuf path = STRBUF_INIT;
	DIR *dir = opendir(git_path("worktrees"));
	struct dirent *d;
	int ret;
	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;
		git_path_buf(&path, "worktrees/%s", d->d_name);
		ret = remove_dir_recursively(&path, 0);
		if (ret < 0 && errno == ENOTDIR)
			ret = unlink(path.buf);
		if (ret)
			error_errno(_("failed to remove '%s'"), path.buf);
	}
	closedir(dir);
	if (!show_only)
		rmdir(git_path("worktrees"));
	strbuf_release(&reason);
	strbuf_release(&path);
}

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 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 stat st;
	struct child_process cp = CHILD_PROCESS_INIT;
	struct argv_array child_env = ARGV_ARRAY_INIT;
	int counter = 0, len, ret;
	struct strbuf symref = STRBUF_INIT;
	struct commit *commit = NULL;
	int is_branch = 0;

	if (file_exists(path) && !is_empty_dir(path))
		die(_("'%s' already exists"), path);

	/* 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);
	git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), 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 (!stat(sb_repo.buf, &st)) {
		counter++;
		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);

	if (mkdir(sb_repo.buf, 0777))
		die_errno(_("could not create directory of '%s'"), sb_repo.buf);
	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", sha1_to_hex(null_sha1));
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
	write_file(sb.buf, "../..");

	fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);

	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);
	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", NULL);
		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;
			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);
	return ret;
}

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 *opt_track = NULL;
	struct option options[] = {
		OPT__FORCE(&opts.force, N_("checkout <branch> even if already checked out in other worktree")),
		OPT_STRING('b', NULL, &opts.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_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 + !!opts.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}";

	opts.force_new_branch = !!new_branch_force;
	if (opts.force_new_branch) {
		struct strbuf symref = STRBUF_INIT;

		opts.new_branch = new_branch_force;

		if (!opts.force &&
		    !strbuf_check_branch_ref(&symref, opts.new_branch) &&
		    ref_exists(symref.buf))
			die_if_checked_out(symref.buf, 0);
		strbuf_release(&symref);
	}

	if (ac < 2 && !opts.new_branch && !opts.detach) {
		int n;
		const char *s = worktree_basename(path, &n);
		opts.new_branch = xstrndup(s, n);
		if (guess_remote) {
			struct object_id oid;
			const char *remote =
				unique_tracking_name(opts.new_branch, &oid);
			if (remote)
				branch = remote;
		}
	}

	if (ac == 2 && !opts.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);
			if (remote) {
				opts.new_branch = branch;
				branch = remote;
			}
		}
	}

	if (opts.new_branch) {
		struct child_process cp = CHILD_PROCESS_INIT;
		cp.git_cmd = 1;
		argv_array_push(&cp.args, "branch");
		if (opts.force_new_branch)
			argv_array_push(&cp.args, "--force");
		argv_array_push(&cp.args, opts.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 = opts.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.hash, 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.hash, *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 = is_worktree_locked(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 (!is_worktree_locked(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;
}

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);
	usage_with_options(worktree_usage, options);
}