Merge branch 'kn/ref-filter-branch-list' into maint
[alt-git.git] / worktree.c
blob89a81b13de38473aaa52870d80f59c247578a3a5
1 #include "cache.h"
2 #include "refs.h"
3 #include "strbuf.h"
4 #include "worktree.h"
5 #include "dir.h"
6 #include "wt-status.h"
8 void free_worktrees(struct worktree **worktrees)
10 int i = 0;
12 for (i = 0; worktrees[i]; i++) {
13 free(worktrees[i]->path);
14 free(worktrees[i]->id);
15 free(worktrees[i]->head_ref);
16 free(worktrees[i]->lock_reason);
17 free(worktrees[i]);
19 free (worktrees);
23 * read 'path_to_ref' into 'ref'. Also if is_detached is not NULL,
24 * set is_detached to 1 (0) if the ref is detached (is not detached).
26 * $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so
27 * for linked worktrees, `resolve_ref_unsafe()` won't work (it uses
28 * git_path). Parse the ref ourselves.
30 * return -1 if the ref is not a proper ref, 0 otherwise (success)
32 static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached)
34 if (is_detached)
35 *is_detached = 0;
36 if (!strbuf_readlink(ref, path_to_ref, 0)) {
37 /* HEAD is symbolic link */
38 if (!starts_with(ref->buf, "refs/") ||
39 check_refname_format(ref->buf, 0))
40 return -1;
41 } else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) {
42 /* textual symref or detached */
43 if (!starts_with(ref->buf, "ref:")) {
44 if (is_detached)
45 *is_detached = 1;
46 } else {
47 strbuf_remove(ref, 0, strlen("ref:"));
48 strbuf_trim(ref);
49 if (check_refname_format(ref->buf, 0))
50 return -1;
52 } else
53 return -1;
54 return 0;
57 /**
58 * Add the head_sha1 and head_ref (if not detached) to the given worktree
60 static void add_head_info(struct strbuf *head_ref, struct worktree *worktree)
62 if (head_ref->len) {
63 if (worktree->is_detached) {
64 get_sha1_hex(head_ref->buf, worktree->head_sha1);
65 } else {
66 resolve_ref_unsafe(head_ref->buf, 0, worktree->head_sha1, NULL);
67 worktree->head_ref = strbuf_detach(head_ref, NULL);
72 /**
73 * get the main worktree
75 static struct worktree *get_main_worktree(void)
77 struct worktree *worktree = NULL;
78 struct strbuf path = STRBUF_INIT;
79 struct strbuf worktree_path = STRBUF_INIT;
80 struct strbuf head_ref = STRBUF_INIT;
81 int is_bare = 0;
82 int is_detached = 0;
84 strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
85 is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
86 if (is_bare)
87 strbuf_strip_suffix(&worktree_path, "/.");
89 strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
91 worktree = xcalloc(1, sizeof(*worktree));
92 worktree->path = strbuf_detach(&worktree_path, NULL);
93 worktree->is_bare = is_bare;
94 worktree->is_detached = is_detached;
95 if (!parse_ref(path.buf, &head_ref, &is_detached))
96 add_head_info(&head_ref, worktree);
98 strbuf_release(&path);
99 strbuf_release(&worktree_path);
100 strbuf_release(&head_ref);
101 return worktree;
104 static struct worktree *get_linked_worktree(const char *id)
106 struct worktree *worktree = NULL;
107 struct strbuf path = STRBUF_INIT;
108 struct strbuf worktree_path = STRBUF_INIT;
109 struct strbuf head_ref = STRBUF_INIT;
110 int is_detached = 0;
112 if (!id)
113 die("Missing linked worktree name");
115 strbuf_git_common_path(&path, "worktrees/%s/gitdir", id);
116 if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
117 /* invalid gitdir file */
118 goto done;
120 strbuf_rtrim(&worktree_path);
121 if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
122 strbuf_reset(&worktree_path);
123 strbuf_add_absolute_path(&worktree_path, ".");
124 strbuf_strip_suffix(&worktree_path, "/.");
127 strbuf_reset(&path);
128 strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);
130 if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
131 goto done;
133 worktree = xcalloc(1, sizeof(*worktree));
134 worktree->path = strbuf_detach(&worktree_path, NULL);
135 worktree->id = xstrdup(id);
136 worktree->is_detached = is_detached;
137 add_head_info(&head_ref, worktree);
139 done:
140 strbuf_release(&path);
141 strbuf_release(&worktree_path);
142 strbuf_release(&head_ref);
143 return worktree;
146 static void mark_current_worktree(struct worktree **worktrees)
148 char *git_dir = absolute_pathdup(get_git_dir());
149 int i;
151 for (i = 0; worktrees[i]; i++) {
152 struct worktree *wt = worktrees[i];
153 const char *wt_git_dir = get_worktree_git_dir(wt);
155 if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) {
156 wt->is_current = 1;
157 break;
160 free(git_dir);
163 static int compare_worktree(const void *a_, const void *b_)
165 const struct worktree *const *a = a_;
166 const struct worktree *const *b = b_;
167 return fspathcmp((*a)->path, (*b)->path);
170 struct worktree **get_worktrees(unsigned flags)
172 struct worktree **list = NULL;
173 struct strbuf path = STRBUF_INIT;
174 DIR *dir;
175 struct dirent *d;
176 int counter = 0, alloc = 2;
178 ALLOC_ARRAY(list, alloc);
180 list[counter++] = get_main_worktree();
182 strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
183 dir = opendir(path.buf);
184 strbuf_release(&path);
185 if (dir) {
186 while ((d = readdir(dir)) != NULL) {
187 struct worktree *linked = NULL;
188 if (is_dot_or_dotdot(d->d_name))
189 continue;
191 if ((linked = get_linked_worktree(d->d_name))) {
192 ALLOC_GROW(list, counter + 1, alloc);
193 list[counter++] = linked;
196 closedir(dir);
198 ALLOC_GROW(list, counter + 1, alloc);
199 list[counter] = NULL;
201 if (flags & GWT_SORT_LINKED)
203 * don't sort the first item (main worktree), which will
204 * always be the first
206 QSORT(list + 1, counter - 1, compare_worktree);
208 mark_current_worktree(list);
209 return list;
212 const char *get_worktree_git_dir(const struct worktree *wt)
214 if (!wt)
215 return get_git_dir();
216 else if (!wt->id)
217 return get_git_common_dir();
218 else
219 return git_common_path("worktrees/%s", wt->id);
222 static struct worktree *find_worktree_by_suffix(struct worktree **list,
223 const char *suffix)
225 struct worktree *found = NULL;
226 int nr_found = 0, suffixlen;
228 suffixlen = strlen(suffix);
229 if (!suffixlen)
230 return NULL;
232 for (; *list && nr_found < 2; list++) {
233 const char *path = (*list)->path;
234 int pathlen = strlen(path);
235 int start = pathlen - suffixlen;
237 /* suffix must start at directory boundary */
238 if ((!start || (start > 0 && is_dir_sep(path[start - 1]))) &&
239 !fspathcmp(suffix, path + start)) {
240 found = *list;
241 nr_found++;
244 return nr_found == 1 ? found : NULL;
247 struct worktree *find_worktree(struct worktree **list,
248 const char *prefix,
249 const char *arg)
251 struct worktree *wt;
252 char *path;
253 char *to_free = NULL;
255 if ((wt = find_worktree_by_suffix(list, arg)))
256 return wt;
258 if (prefix)
259 arg = to_free = prefix_filename(prefix, arg);
260 path = real_pathdup(arg, 1);
261 for (; *list; list++)
262 if (!fspathcmp(path, real_path((*list)->path)))
263 break;
264 free(path);
265 free(to_free);
266 return *list;
269 int is_main_worktree(const struct worktree *wt)
271 return !wt->id;
274 const char *is_worktree_locked(struct worktree *wt)
276 assert(!is_main_worktree(wt));
278 if (!wt->lock_reason_valid) {
279 struct strbuf path = STRBUF_INIT;
281 strbuf_addstr(&path, worktree_git_path(wt, "locked"));
282 if (file_exists(path.buf)) {
283 struct strbuf lock_reason = STRBUF_INIT;
284 if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)
285 die_errno(_("failed to read '%s'"), path.buf);
286 strbuf_trim(&lock_reason);
287 wt->lock_reason = strbuf_detach(&lock_reason, NULL);
288 } else
289 wt->lock_reason = NULL;
290 wt->lock_reason_valid = 1;
291 strbuf_release(&path);
294 return wt->lock_reason;
297 int is_worktree_being_rebased(const struct worktree *wt,
298 const char *target)
300 struct wt_status_state state;
301 int found_rebase;
303 memset(&state, 0, sizeof(state));
304 found_rebase = wt_status_check_rebase(wt, &state) &&
305 ((state.rebase_in_progress ||
306 state.rebase_interactive_in_progress) &&
307 state.branch &&
308 starts_with(target, "refs/heads/") &&
309 !strcmp(state.branch, target + strlen("refs/heads/")));
310 free(state.branch);
311 free(state.onto);
312 return found_rebase;
315 int is_worktree_being_bisected(const struct worktree *wt,
316 const char *target)
318 struct wt_status_state state;
319 int found_rebase;
321 memset(&state, 0, sizeof(state));
322 found_rebase = wt_status_check_bisect(wt, &state) &&
323 state.branch &&
324 starts_with(target, "refs/heads/") &&
325 !strcmp(state.branch, target + strlen("refs/heads/"));
326 free(state.branch);
327 return found_rebase;
331 * note: this function should be able to detect shared symref even if
332 * HEAD is temporarily detached (e.g. in the middle of rebase or
333 * bisect). New commands that do similar things should update this
334 * function as well.
336 const struct worktree *find_shared_symref(const char *symref,
337 const char *target)
339 const struct worktree *existing = NULL;
340 struct strbuf path = STRBUF_INIT;
341 struct strbuf sb = STRBUF_INIT;
342 static struct worktree **worktrees;
343 int i = 0;
345 if (worktrees)
346 free_worktrees(worktrees);
347 worktrees = get_worktrees(0);
349 for (i = 0; worktrees[i]; i++) {
350 struct worktree *wt = worktrees[i];
351 if (wt->is_bare)
352 continue;
354 if (wt->is_detached && !strcmp(symref, "HEAD")) {
355 if (is_worktree_being_rebased(wt, target)) {
356 existing = wt;
357 break;
359 if (is_worktree_being_bisected(wt, target)) {
360 existing = wt;
361 break;
365 strbuf_reset(&path);
366 strbuf_reset(&sb);
367 strbuf_addf(&path, "%s/%s",
368 get_worktree_git_dir(wt),
369 symref);
371 if (parse_ref(path.buf, &sb, NULL)) {
372 continue;
375 if (!strcmp(sb.buf, target)) {
376 existing = wt;
377 break;
381 strbuf_release(&path);
382 strbuf_release(&sb);
384 return existing;
387 int submodule_uses_worktrees(const char *path)
389 char *submodule_gitdir;
390 struct strbuf sb = STRBUF_INIT;
391 DIR *dir;
392 struct dirent *d;
393 int ret = 0;
394 struct repository_format format;
396 submodule_gitdir = git_pathdup_submodule(path, "%s", "");
397 if (!submodule_gitdir)
398 return 0;
400 /* The env would be set for the superproject. */
401 get_common_dir_noenv(&sb, submodule_gitdir);
402 free(submodule_gitdir);
405 * The check below is only known to be good for repository format
406 * version 0 at the time of writing this code.
408 strbuf_addstr(&sb, "/config");
409 read_repository_format(&format, sb.buf);
410 if (format.version != 0) {
411 strbuf_release(&sb);
412 return 1;
415 /* Replace config by worktrees. */
416 strbuf_setlen(&sb, sb.len - strlen("config"));
417 strbuf_addstr(&sb, "worktrees");
419 /* See if there is any file inside the worktrees directory. */
420 dir = opendir(sb.buf);
421 strbuf_release(&sb);
423 if (!dir)
424 return 0;
426 while ((d = readdir(dir)) != NULL) {
427 if (is_dot_or_dotdot(d->d_name))
428 continue;
430 ret = 1;
431 break;
433 closedir(dir);
434 return ret;