aboutsummaryrefslogtreecommitdiff
path: root/worktree.c
blob: f8c40f2f5f8ce5b18c976b5281f5618adbeee4a7 (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
#include "cache.h"
#include "repository.h"
#include "refs.h"
#include "strbuf.h"
#include "worktree.h"
#include "dir.h"
#include "wt-status.h"

void free_worktrees(struct worktree **worktrees)
{
	int i = 0;

	for (i = 0; worktrees[i]; i++) {
		free(worktrees[i]->path);
		free(worktrees[i]->id);
		free(worktrees[i]->head_ref);
		free(worktrees[i]->lock_reason);
		free(worktrees[i]);
	}
	free (worktrees);
}

/**
 * Update head_sha1, head_ref and is_detached of the given worktree
 */
static void add_head_info(struct worktree *wt)
{
	int flags;
	const char *target;

	target = refs_resolve_ref_unsafe(get_worktree_ref_store(wt),
					 "HEAD",
					 0,
					 wt->head_sha1, &flags);
	if (!target)
		return;

	if (flags & REF_ISSYMREF)
		wt->head_ref = xstrdup(target);
	else
		wt->is_detached = 1;
}

/**
 * get the main worktree
 */
static struct worktree *get_main_worktree(void)
{
	struct worktree *worktree = NULL;
	struct strbuf path = STRBUF_INIT;
	struct strbuf worktree_path = STRBUF_INIT;
	int is_bare = 0;

	strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
	is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
	if (is_bare)
		strbuf_strip_suffix(&worktree_path, "/.");

	strbuf_addf(&path, "%s/HEAD", get_git_common_dir());

	worktree = xcalloc(1, sizeof(*worktree));
	worktree->path = strbuf_detach(&worktree_path, NULL);
	worktree->is_bare = is_bare;
	add_head_info(worktree);

	strbuf_release(&path);
	strbuf_release(&worktree_path);
	return worktree;
}

static struct worktree *get_linked_worktree(const char *id)
{
	struct worktree *worktree = NULL;
	struct strbuf path = STRBUF_INIT;
	struct strbuf worktree_path = STRBUF_INIT;

	if (!id)
		die("Missing linked worktree name");

	strbuf_git_common_path(&path, the_repository, "worktrees/%s/gitdir", id);
	if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
		/* invalid gitdir file */
		goto done;

	strbuf_rtrim(&worktree_path);
	if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
		strbuf_reset(&worktree_path);
		strbuf_add_absolute_path(&worktree_path, ".");
		strbuf_strip_suffix(&worktree_path, "/.");
	}

	strbuf_reset(&path);
	strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);

	worktree = xcalloc(1, sizeof(*worktree));
	worktree->path = strbuf_detach(&worktree_path, NULL);
	worktree->id = xstrdup(id);
	add_head_info(worktree);

done:
	strbuf_release(&path);
	strbuf_release(&worktree_path);
	return worktree;
}

static void mark_current_worktree(struct worktree **worktrees)
{
	char *git_dir = absolute_pathdup(get_git_dir());
	int i;

	for (i = 0; worktrees[i]; i++) {
		struct worktree *wt = worktrees[i];
		const char *wt_git_dir = get_worktree_git_dir(wt);

		if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) {
			wt->is_current = 1;
			break;
		}
	}
	free(git_dir);
}

static int compare_worktree(const void *a_, const void *b_)
{
	const struct worktree *const *a = a_;
	const struct worktree *const *b = b_;
	return fspathcmp((*a)->path, (*b)->path);
}

struct worktree **get_worktrees(unsigned flags)
{
	struct worktree **list = NULL;
	struct strbuf path = STRBUF_INIT;
	DIR *dir;
	struct dirent *d;
	int counter = 0, alloc = 2;

	ALLOC_ARRAY(list, alloc);

	list[counter++] = get_main_worktree();

	strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
	dir = opendir(path.buf);
	strbuf_release(&path);
	if (dir) {
		while ((d = readdir(dir)) != NULL) {
			struct worktree *linked = NULL;
			if (is_dot_or_dotdot(d->d_name))
				continue;

			if ((linked = get_linked_worktree(d->d_name))) {
				ALLOC_GROW(list, counter + 1, alloc);
				list[counter++] = linked;
			}
		}
		closedir(dir);
	}
	ALLOC_GROW(list, counter + 1, alloc);
	list[counter] = NULL;

	if (flags & GWT_SORT_LINKED)
		/*
		 * don't sort the first item (main worktree), which will
		 * always be the first
		 */
		QSORT(list + 1, counter - 1, compare_worktree);

	mark_current_worktree(list);
	return list;
}

const char *get_worktree_git_dir(const struct worktree *wt)
{
	if (!wt)
		return get_git_dir();
	else if (!wt->id)
		return get_git_common_dir();
	else
		return git_common_path("worktrees/%s", wt->id);
}

static struct worktree *find_worktree_by_suffix(struct worktree **list,
						const char *suffix)
{
	struct worktree *found = NULL;
	int nr_found = 0, suffixlen;

	suffixlen = strlen(suffix);
	if (!suffixlen)
		return NULL;

	for (; *list && nr_found < 2; list++) {
		const char	*path	 = (*list)->path;
		int		 pathlen = strlen(path);
		int		 start	 = pathlen - suffixlen;

		/* suffix must start at directory boundary */
		if ((!start || (start > 0 && is_dir_sep(path[start - 1]))) &&
		    !fspathcmp(suffix, path + start)) {
			found = *list;
			nr_found++;
		}
	}
	return nr_found == 1 ? found : NULL;
}

struct worktree *find_worktree(struct worktree **list,
			       const char *prefix,
			       const char *arg)
{
	struct worktree *wt;
	char *path;
	char *to_free = NULL;

	if ((wt = find_worktree_by_suffix(list, arg)))
		return wt;

	if (prefix)
		arg = to_free = prefix_filename(prefix, arg);
	path = real_pathdup(arg, 1);
	for (; *list; list++)
		if (!fspathcmp(path, real_path((*list)->path)))
			break;
	free(path);
	free(to_free);
	return *list;
}

int is_main_worktree(const struct worktree *wt)
{
	return !wt->id;
}

const char *is_worktree_locked(struct worktree *wt)
{
	assert(!is_main_worktree(wt));

	if (!wt->lock_reason_valid) {
		struct strbuf path = STRBUF_INIT;

		strbuf_addstr(&path, worktree_git_path(wt, "locked"));
		if (file_exists(path.buf)) {
			struct strbuf lock_reason = STRBUF_INIT;
			if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)
				die_errno(_("failed to read '%s'"), path.buf);
			strbuf_trim(&lock_reason);
			wt->lock_reason = strbuf_detach(&lock_reason, NULL);
		} else
			wt->lock_reason = NULL;
		wt->lock_reason_valid = 1;
		strbuf_release(&path);
	}

	return wt->lock_reason;
}

int is_worktree_being_rebased(const struct worktree *wt,
			      const char *target)
{
	struct wt_status_state state;
	int found_rebase;

	memset(&state, 0, sizeof(state));
	found_rebase = wt_status_check_rebase(wt, &state) &&
		((state.rebase_in_progress ||
		  state.rebase_interactive_in_progress) &&
		 state.branch &&
		 starts_with(target, "refs/heads/") &&
		 !strcmp(state.branch, target + strlen("refs/heads/")));
	free(state.branch);
	free(state.onto);
	return found_rebase;
}

int is_worktree_being_bisected(const struct worktree *wt,
			       const char *target)
{
	struct wt_status_state state;
	int found_rebase;

	memset(&state, 0, sizeof(state));
	found_rebase = wt_status_check_bisect(wt, &state) &&
		state.branch &&
		starts_with(target, "refs/heads/") &&
		!strcmp(state.branch, target + strlen("refs/heads/"));
	free(state.branch);
	return found_rebase;
}

/*
 * note: this function should be able to detect shared symref even if
 * HEAD is temporarily detached (e.g. in the middle of rebase or
 * bisect). New commands that do similar things should update this
 * function as well.
 */
const struct worktree *find_shared_symref(const char *symref,
					  const char *target)
{
	const struct worktree *existing = NULL;
	static struct worktree **worktrees;
	int i = 0;

	if (worktrees)
		free_worktrees(worktrees);
	worktrees = get_worktrees(0);

	for (i = 0; worktrees[i]; i++) {
		struct worktree *wt = worktrees[i];
		const char *symref_target;
		struct ref_store *refs;
		int flags;

		if (wt->is_bare)
			continue;

		if (wt->is_detached && !strcmp(symref, "HEAD")) {
			if (is_worktree_being_rebased(wt, target)) {
				existing = wt;
				break;
			}
			if (is_worktree_being_bisected(wt, target)) {
				existing = wt;
				break;
			}
		}

		refs = get_worktree_ref_store(wt);
		symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
							NULL, &flags);
		if ((flags & REF_ISSYMREF) &&
		    symref_target && !strcmp(symref_target, target)) {
			existing = wt;
			break;
		}
	}

	return existing;
}

int submodule_uses_worktrees(const char *path)
{
	char *submodule_gitdir;
	struct strbuf sb = STRBUF_INIT;
	DIR *dir;
	struct dirent *d;
	int ret = 0;
	struct repository_format format;

	submodule_gitdir = git_pathdup_submodule(path, "%s", "");
	if (!submodule_gitdir)
		return 0;

	/* The env would be set for the superproject. */
	get_common_dir_noenv(&sb, submodule_gitdir);
	free(submodule_gitdir);

	/*
	 * The check below is only known to be good for repository format
	 * version 0 at the time of writing this code.
	 */
	strbuf_addstr(&sb, "/config");
	read_repository_format(&format, sb.buf);
	if (format.version != 0) {
		strbuf_release(&sb);
		return 1;
	}

	/* Replace config by worktrees. */
	strbuf_setlen(&sb, sb.len - strlen("config"));
	strbuf_addstr(&sb, "worktrees");

	/* See if there is any file inside the worktrees directory. */
	dir = opendir(sb.buf);
	strbuf_release(&sb);

	if (!dir)
		return 0;

	while ((d = readdir(dir)) != NULL) {
		if (is_dot_or_dotdot(d->d_name))
			continue;

		ret = 1;
		break;
	}
	closedir(dir);
	return ret;
}

int other_head_refs(each_ref_fn fn, void *cb_data)
{
	struct worktree **worktrees, **p;
	int ret = 0;

	worktrees = get_worktrees(0);
	for (p = worktrees; *p; p++) {
		struct worktree *wt = *p;
		struct ref_store *refs;

		if (wt->is_current)
			continue;

		refs = get_worktree_ref_store(wt);
		ret = refs_head_ref(refs, fn, cb_data);
		if (ret)
			break;
	}
	free_worktrees(worktrees);
	return ret;
}