0373faf0dc805b78581a92c46149a5bea5567dfe
[git/git.git] / worktree.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "refs.h"
4 #include "strbuf.h"
5 #include "worktree.h"
6 #include "dir.h"
7 #include "wt-status.h"
8
9 void free_worktrees(struct worktree **worktrees)
10 {
11 int i = 0;
12
13 for (i = 0; worktrees[i]; i++) {
14 free(worktrees[i]->path);
15 free(worktrees[i]->id);
16 free(worktrees[i]->head_ref);
17 free(worktrees[i]->lock_reason);
18 free(worktrees[i]);
19 }
20 free (worktrees);
21 }
22
23 /**
24 * Update head_sha1, head_ref and is_detached of the given worktree
25 */
26 static void add_head_info(struct worktree *wt)
27 {
28 int flags;
29 const char *target;
30
31 target = refs_resolve_ref_unsafe(get_worktree_ref_store(wt),
32 "HEAD",
33 0,
34 &wt->head_oid, &flags);
35 if (!target)
36 return;
37
38 if (flags & REF_ISSYMREF)
39 wt->head_ref = xstrdup(target);
40 else
41 wt->is_detached = 1;
42 }
43
44 /**
45 * get the main worktree
46 */
47 static struct worktree *get_main_worktree(void)
48 {
49 struct worktree *worktree = NULL;
50 struct strbuf path = STRBUF_INIT;
51 struct strbuf worktree_path = STRBUF_INIT;
52 int is_bare = 0;
53
54 strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
55 is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
56 if (is_bare)
57 strbuf_strip_suffix(&worktree_path, "/.");
58
59 strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
60
61 worktree = xcalloc(1, sizeof(*worktree));
62 worktree->path = strbuf_detach(&worktree_path, NULL);
63 worktree->is_bare = is_bare;
64 add_head_info(worktree);
65
66 strbuf_release(&path);
67 strbuf_release(&worktree_path);
68 return worktree;
69 }
70
71 static struct worktree *get_linked_worktree(const char *id)
72 {
73 struct worktree *worktree = NULL;
74 struct strbuf path = STRBUF_INIT;
75 struct strbuf worktree_path = STRBUF_INIT;
76
77 if (!id)
78 die("Missing linked worktree name");
79
80 strbuf_git_common_path(&path, the_repository, "worktrees/%s/gitdir", id);
81 if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
82 /* invalid gitdir file */
83 goto done;
84
85 strbuf_rtrim(&worktree_path);
86 if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
87 strbuf_reset(&worktree_path);
88 strbuf_add_absolute_path(&worktree_path, ".");
89 strbuf_strip_suffix(&worktree_path, "/.");
90 }
91
92 strbuf_reset(&path);
93 strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);
94
95 worktree = xcalloc(1, sizeof(*worktree));
96 worktree->path = strbuf_detach(&worktree_path, NULL);
97 worktree->id = xstrdup(id);
98 add_head_info(worktree);
99
100 done:
101 strbuf_release(&path);
102 strbuf_release(&worktree_path);
103 return worktree;
104 }
105
106 static void mark_current_worktree(struct worktree **worktrees)
107 {
108 char *git_dir = absolute_pathdup(get_git_dir());
109 int i;
110
111 for (i = 0; worktrees[i]; i++) {
112 struct worktree *wt = worktrees[i];
113 const char *wt_git_dir = get_worktree_git_dir(wt);
114
115 if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) {
116 wt->is_current = 1;
117 break;
118 }
119 }
120 free(git_dir);
121 }
122
123 static int compare_worktree(const void *a_, const void *b_)
124 {
125 const struct worktree *const *a = a_;
126 const struct worktree *const *b = b_;
127 return fspathcmp((*a)->path, (*b)->path);
128 }
129
130 struct worktree **get_worktrees(unsigned flags)
131 {
132 struct worktree **list = NULL;
133 struct strbuf path = STRBUF_INIT;
134 DIR *dir;
135 struct dirent *d;
136 int counter = 0, alloc = 2;
137
138 ALLOC_ARRAY(list, alloc);
139
140 list[counter++] = get_main_worktree();
141
142 strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
143 dir = opendir(path.buf);
144 strbuf_release(&path);
145 if (dir) {
146 while ((d = readdir(dir)) != NULL) {
147 struct worktree *linked = NULL;
148 if (is_dot_or_dotdot(d->d_name))
149 continue;
150
151 if ((linked = get_linked_worktree(d->d_name))) {
152 ALLOC_GROW(list, counter + 1, alloc);
153 list[counter++] = linked;
154 }
155 }
156 closedir(dir);
157 }
158 ALLOC_GROW(list, counter + 1, alloc);
159 list[counter] = NULL;
160
161 if (flags & GWT_SORT_LINKED)
162 /*
163 * don't sort the first item (main worktree), which will
164 * always be the first
165 */
166 QSORT(list + 1, counter - 1, compare_worktree);
167
168 mark_current_worktree(list);
169 return list;
170 }
171
172 const char *get_worktree_git_dir(const struct worktree *wt)
173 {
174 if (!wt)
175 return get_git_dir();
176 else if (!wt->id)
177 return get_git_common_dir();
178 else
179 return git_common_path("worktrees/%s", wt->id);
180 }
181
182 static struct worktree *find_worktree_by_suffix(struct worktree **list,
183 const char *suffix)
184 {
185 struct worktree *found = NULL;
186 int nr_found = 0, suffixlen;
187
188 suffixlen = strlen(suffix);
189 if (!suffixlen)
190 return NULL;
191
192 for (; *list && nr_found < 2; list++) {
193 const char *path = (*list)->path;
194 int pathlen = strlen(path);
195 int start = pathlen - suffixlen;
196
197 /* suffix must start at directory boundary */
198 if ((!start || (start > 0 && is_dir_sep(path[start - 1]))) &&
199 !fspathcmp(suffix, path + start)) {
200 found = *list;
201 nr_found++;
202 }
203 }
204 return nr_found == 1 ? found : NULL;
205 }
206
207 struct worktree *find_worktree(struct worktree **list,
208 const char *prefix,
209 const char *arg)
210 {
211 struct worktree *wt;
212 char *path;
213 char *to_free = NULL;
214
215 if ((wt = find_worktree_by_suffix(list, arg)))
216 return wt;
217
218 if (prefix)
219 arg = to_free = prefix_filename(prefix, arg);
220 path = real_pathdup(arg, 1);
221 for (; *list; list++)
222 if (!fspathcmp(path, real_path((*list)->path)))
223 break;
224 free(path);
225 free(to_free);
226 return *list;
227 }
228
229 int is_main_worktree(const struct worktree *wt)
230 {
231 return !wt->id;
232 }
233
234 const char *is_worktree_locked(struct worktree *wt)
235 {
236 assert(!is_main_worktree(wt));
237
238 if (!wt->lock_reason_valid) {
239 struct strbuf path = STRBUF_INIT;
240
241 strbuf_addstr(&path, worktree_git_path(wt, "locked"));
242 if (file_exists(path.buf)) {
243 struct strbuf lock_reason = STRBUF_INIT;
244 if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)
245 die_errno(_("failed to read '%s'"), path.buf);
246 strbuf_trim(&lock_reason);
247 wt->lock_reason = strbuf_detach(&lock_reason, NULL);
248 } else
249 wt->lock_reason = NULL;
250 wt->lock_reason_valid = 1;
251 strbuf_release(&path);
252 }
253
254 return wt->lock_reason;
255 }
256
257 /* convenient wrapper to deal with NULL strbuf */
258 static void strbuf_addf_gently(struct strbuf *buf, const char *fmt, ...)
259 {
260 va_list params;
261
262 if (!buf)
263 return;
264
265 va_start(params, fmt);
266 strbuf_vaddf(buf, fmt, params);
267 va_end(params);
268 }
269
270 int validate_worktree(const struct worktree *wt, struct strbuf *errmsg)
271 {
272 struct strbuf wt_path = STRBUF_INIT;
273 char *path = NULL;
274 int err, ret = -1;
275
276 strbuf_addf(&wt_path, "%s/.git", wt->path);
277
278 if (is_main_worktree(wt)) {
279 if (is_directory(wt_path.buf)) {
280 ret = 0;
281 goto done;
282 }
283 /*
284 * Main worktree using .git file to point to the
285 * repository would make it impossible to know where
286 * the actual worktree is if this function is executed
287 * from another worktree. No .git file support for now.
288 */
289 strbuf_addf_gently(errmsg,
290 _("'%s' at main working tree is not the repository directory"),
291 wt_path.buf);
292 goto done;
293 }
294
295 /*
296 * Make sure "gitdir" file points to a real .git file and that
297 * file points back here.
298 */
299 if (!is_absolute_path(wt->path)) {
300 strbuf_addf_gently(errmsg,
301 _("'%s' file does not contain absolute path to the working tree location"),
302 git_common_path("worktrees/%s/gitdir", wt->id));
303 goto done;
304 }
305
306 if (!file_exists(wt_path.buf)) {
307 strbuf_addf_gently(errmsg, _("'%s' does not exist"), wt_path.buf);
308 goto done;
309 }
310
311 path = xstrdup_or_null(read_gitfile_gently(wt_path.buf, &err));
312 if (!path) {
313 strbuf_addf_gently(errmsg, _("'%s' is not a .git file, error code %d"),
314 wt_path.buf, err);
315 goto done;
316 }
317
318 ret = fspathcmp(path, real_path(git_common_path("worktrees/%s", wt->id)));
319
320 if (ret)
321 strbuf_addf_gently(errmsg, _("'%s' does not point back to '%s'"),
322 wt->path, git_common_path("worktrees/%s", wt->id));
323 done:
324 free(path);
325 strbuf_release(&wt_path);
326 return ret;
327 }
328
329 void update_worktree_location(struct worktree *wt, const char *path_)
330 {
331 struct strbuf path = STRBUF_INIT;
332
333 if (is_main_worktree(wt))
334 die("BUG: can't relocate main worktree");
335
336 strbuf_realpath(&path, path_, 1);
337 if (fspathcmp(wt->path, path.buf)) {
338 write_file(git_common_path("worktrees/%s/gitdir", wt->id),
339 "%s/.git", path.buf);
340 free(wt->path);
341 wt->path = strbuf_detach(&path, NULL);
342 }
343 strbuf_release(&path);
344 }
345
346 int is_worktree_being_rebased(const struct worktree *wt,
347 const char *target)
348 {
349 struct wt_status_state state;
350 int found_rebase;
351
352 memset(&state, 0, sizeof(state));
353 found_rebase = wt_status_check_rebase(wt, &state) &&
354 ((state.rebase_in_progress ||
355 state.rebase_interactive_in_progress) &&
356 state.branch &&
357 starts_with(target, "refs/heads/") &&
358 !strcmp(state.branch, target + strlen("refs/heads/")));
359 free(state.branch);
360 free(state.onto);
361 return found_rebase;
362 }
363
364 int is_worktree_being_bisected(const struct worktree *wt,
365 const char *target)
366 {
367 struct wt_status_state state;
368 int found_rebase;
369
370 memset(&state, 0, sizeof(state));
371 found_rebase = wt_status_check_bisect(wt, &state) &&
372 state.branch &&
373 starts_with(target, "refs/heads/") &&
374 !strcmp(state.branch, target + strlen("refs/heads/"));
375 free(state.branch);
376 return found_rebase;
377 }
378
379 /*
380 * note: this function should be able to detect shared symref even if
381 * HEAD is temporarily detached (e.g. in the middle of rebase or
382 * bisect). New commands that do similar things should update this
383 * function as well.
384 */
385 const struct worktree *find_shared_symref(const char *symref,
386 const char *target)
387 {
388 const struct worktree *existing = NULL;
389 static struct worktree **worktrees;
390 int i = 0;
391
392 if (worktrees)
393 free_worktrees(worktrees);
394 worktrees = get_worktrees(0);
395
396 for (i = 0; worktrees[i]; i++) {
397 struct worktree *wt = worktrees[i];
398 const char *symref_target;
399 struct ref_store *refs;
400 int flags;
401
402 if (wt->is_bare)
403 continue;
404
405 if (wt->is_detached && !strcmp(symref, "HEAD")) {
406 if (is_worktree_being_rebased(wt, target)) {
407 existing = wt;
408 break;
409 }
410 if (is_worktree_being_bisected(wt, target)) {
411 existing = wt;
412 break;
413 }
414 }
415
416 refs = get_worktree_ref_store(wt);
417 symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
418 NULL, &flags);
419 if ((flags & REF_ISSYMREF) &&
420 symref_target && !strcmp(symref_target, target)) {
421 existing = wt;
422 break;
423 }
424 }
425
426 return existing;
427 }
428
429 int submodule_uses_worktrees(const char *path)
430 {
431 char *submodule_gitdir;
432 struct strbuf sb = STRBUF_INIT;
433 DIR *dir;
434 struct dirent *d;
435 int ret = 0;
436 struct repository_format format;
437
438 submodule_gitdir = git_pathdup_submodule(path, "%s", "");
439 if (!submodule_gitdir)
440 return 0;
441
442 /* The env would be set for the superproject. */
443 get_common_dir_noenv(&sb, submodule_gitdir);
444 free(submodule_gitdir);
445
446 /*
447 * The check below is only known to be good for repository format
448 * version 0 at the time of writing this code.
449 */
450 strbuf_addstr(&sb, "/config");
451 read_repository_format(&format, sb.buf);
452 if (format.version != 0) {
453 strbuf_release(&sb);
454 return 1;
455 }
456
457 /* Replace config by worktrees. */
458 strbuf_setlen(&sb, sb.len - strlen("config"));
459 strbuf_addstr(&sb, "worktrees");
460
461 /* See if there is any file inside the worktrees directory. */
462 dir = opendir(sb.buf);
463 strbuf_release(&sb);
464
465 if (!dir)
466 return 0;
467
468 while ((d = readdir(dir)) != NULL) {
469 if (is_dot_or_dotdot(d->d_name))
470 continue;
471
472 ret = 1;
473 break;
474 }
475 closedir(dir);
476 return ret;
477 }
478
479 int other_head_refs(each_ref_fn fn, void *cb_data)
480 {
481 struct worktree **worktrees, **p;
482 int ret = 0;
483
484 worktrees = get_worktrees(0);
485 for (p = worktrees; *p; p++) {
486 struct worktree *wt = *p;
487 struct ref_store *refs;
488
489 if (wt->is_current)
490 continue;
491
492 refs = get_worktree_ref_store(wt);
493 ret = refs_head_ref(refs, fn, cb_data);
494 if (ret)
495 break;
496 }
497 free_worktrees(worktrees);
498 return ret;
499 }