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ac6c561b MR |
1 | #include "cache.h" |
2 | #include "refs.h" | |
3 | #include "strbuf.h" | |
4 | #include "worktree.h" | |
5 | ||
51934904 MR |
6 | void free_worktrees(struct worktree **worktrees) |
7 | { | |
8 | int i = 0; | |
9 | ||
10 | for (i = 0; worktrees[i]; i++) { | |
11 | free(worktrees[i]->path); | |
92718b74 MR |
12 | free(worktrees[i]->git_dir); |
13 | free(worktrees[i]->head_ref); | |
51934904 MR |
14 | free(worktrees[i]); |
15 | } | |
16 | free (worktrees); | |
17 | } | |
18 | ||
1ceb7f90 MR |
19 | /* |
20 | * read 'path_to_ref' into 'ref'. Also if is_detached is not NULL, | |
21 | * set is_detached to 1 (0) if the ref is detatched (is not detached). | |
22 | * | |
23 | * $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so | |
24 | * for linked worktrees, `resolve_ref_unsafe()` won't work (it uses | |
25 | * git_path). Parse the ref ourselves. | |
26 | * | |
27 | * return -1 if the ref is not a proper ref, 0 otherwise (success) | |
28 | */ | |
29 | static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached) | |
30 | { | |
31 | if (is_detached) | |
32 | *is_detached = 0; | |
33 | if (!strbuf_readlink(ref, path_to_ref, 0)) { | |
34 | /* HEAD is symbolic link */ | |
35 | if (!starts_with(ref->buf, "refs/") || | |
36 | check_refname_format(ref->buf, 0)) | |
37 | return -1; | |
38 | } else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) { | |
39 | /* textual symref or detached */ | |
40 | if (!starts_with(ref->buf, "ref:")) { | |
41 | if (is_detached) | |
42 | *is_detached = 1; | |
43 | } else { | |
44 | strbuf_remove(ref, 0, strlen("ref:")); | |
45 | strbuf_trim(ref); | |
46 | if (check_refname_format(ref->buf, 0)) | |
47 | return -1; | |
48 | } | |
49 | } else | |
50 | return -1; | |
51 | return 0; | |
52 | } | |
53 | ||
92718b74 MR |
54 | /** |
55 | * Add the head_sha1 and head_ref (if not detached) to the given worktree | |
56 | */ | |
57 | static void add_head_info(struct strbuf *head_ref, struct worktree *worktree) | |
58 | { | |
59 | if (head_ref->len) { | |
60 | if (worktree->is_detached) { | |
61 | get_sha1_hex(head_ref->buf, worktree->head_sha1); | |
62 | } else { | |
63 | resolve_ref_unsafe(head_ref->buf, 0, worktree->head_sha1, NULL); | |
64 | worktree->head_ref = strbuf_detach(head_ref, NULL); | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
51934904 MR |
69 | /** |
70 | * get the main worktree | |
71 | */ | |
72 | static struct worktree *get_main_worktree(void) | |
1ceb7f90 | 73 | { |
51934904 | 74 | struct worktree *worktree = NULL; |
1ceb7f90 | 75 | struct strbuf path = STRBUF_INIT; |
51934904 | 76 | struct strbuf worktree_path = STRBUF_INIT; |
1ceb7f90 | 77 | struct strbuf gitdir = STRBUF_INIT; |
51934904 | 78 | struct strbuf head_ref = STRBUF_INIT; |
92718b74 MR |
79 | int is_bare = 0; |
80 | int is_detached = 0; | |
1ceb7f90 | 81 | |
51934904 MR |
82 | strbuf_addf(&gitdir, "%s", absolute_path(get_git_common_dir())); |
83 | strbuf_addbuf(&worktree_path, &gitdir); | |
92718b74 MR |
84 | is_bare = !strbuf_strip_suffix(&worktree_path, "/.git"); |
85 | if (is_bare) | |
51934904 MR |
86 | strbuf_strip_suffix(&worktree_path, "/."); |
87 | ||
88 | strbuf_addf(&path, "%s/HEAD", get_git_common_dir()); | |
89 | ||
92718b74 MR |
90 | if (parse_ref(path.buf, &head_ref, &is_detached) < 0) |
91 | goto done; | |
92 | ||
93 | worktree = xmalloc(sizeof(struct worktree)); | |
94 | worktree->path = strbuf_detach(&worktree_path, NULL); | |
95 | worktree->git_dir = strbuf_detach(&gitdir, NULL); | |
96 | worktree->is_bare = is_bare; | |
97 | worktree->head_ref = NULL; | |
98 | worktree->is_detached = is_detached; | |
99 | add_head_info(&head_ref, worktree); | |
100 | ||
101 | done: | |
1ceb7f90 | 102 | strbuf_release(&path); |
1ceb7f90 | 103 | strbuf_release(&gitdir); |
51934904 MR |
104 | strbuf_release(&worktree_path); |
105 | strbuf_release(&head_ref); | |
106 | return worktree; | |
1ceb7f90 MR |
107 | } |
108 | ||
51934904 | 109 | static struct worktree *get_linked_worktree(const char *id) |
ac6c561b | 110 | { |
51934904 | 111 | struct worktree *worktree = NULL; |
ac6c561b | 112 | struct strbuf path = STRBUF_INIT; |
51934904 | 113 | struct strbuf worktree_path = STRBUF_INIT; |
ac6c561b | 114 | struct strbuf gitdir = STRBUF_INIT; |
51934904 | 115 | struct strbuf head_ref = STRBUF_INIT; |
92718b74 | 116 | int is_detached = 0; |
ac6c561b | 117 | |
1ceb7f90 MR |
118 | if (!id) |
119 | die("Missing linked worktree name"); | |
ac6c561b | 120 | |
51934904 MR |
121 | strbuf_addf(&gitdir, "%s/worktrees/%s", |
122 | absolute_path(get_git_common_dir()), id); | |
123 | strbuf_addf(&path, "%s/gitdir", gitdir.buf); | |
124 | if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0) | |
125 | /* invalid gitdir file */ | |
ac6c561b | 126 | goto done; |
51934904 MR |
127 | |
128 | strbuf_rtrim(&worktree_path); | |
129 | if (!strbuf_strip_suffix(&worktree_path, "/.git")) { | |
130 | strbuf_reset(&worktree_path); | |
131 | strbuf_addstr(&worktree_path, absolute_path(".")); | |
132 | strbuf_strip_suffix(&worktree_path, "/."); | |
133 | } | |
134 | ||
1ceb7f90 | 135 | strbuf_reset(&path); |
51934904 MR |
136 | strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id); |
137 | ||
92718b74 MR |
138 | if (parse_ref(path.buf, &head_ref, &is_detached) < 0) |
139 | goto done; | |
140 | ||
141 | worktree = xmalloc(sizeof(struct worktree)); | |
142 | worktree->path = strbuf_detach(&worktree_path, NULL); | |
143 | worktree->git_dir = strbuf_detach(&gitdir, NULL); | |
144 | worktree->is_bare = 0; | |
145 | worktree->head_ref = NULL; | |
146 | worktree->is_detached = is_detached; | |
147 | add_head_info(&head_ref, worktree); | |
ac6c561b | 148 | |
ac6c561b MR |
149 | done: |
150 | strbuf_release(&path); | |
ac6c561b | 151 | strbuf_release(&gitdir); |
51934904 MR |
152 | strbuf_release(&worktree_path); |
153 | strbuf_release(&head_ref); | |
154 | return worktree; | |
ac6c561b MR |
155 | } |
156 | ||
51934904 | 157 | struct worktree **get_worktrees(void) |
ac6c561b | 158 | { |
51934904 | 159 | struct worktree **list = NULL; |
ac6c561b MR |
160 | struct strbuf path = STRBUF_INIT; |
161 | DIR *dir; | |
162 | struct dirent *d; | |
51934904 MR |
163 | int counter = 0, alloc = 2; |
164 | ||
165 | list = xmalloc(alloc * sizeof(struct worktree *)); | |
ac6c561b | 166 | |
51934904 MR |
167 | if ((list[counter] = get_main_worktree())) |
168 | counter++; | |
ac6c561b MR |
169 | |
170 | strbuf_addf(&path, "%s/worktrees", get_git_common_dir()); | |
171 | dir = opendir(path.buf); | |
172 | strbuf_release(&path); | |
51934904 MR |
173 | if (dir) { |
174 | while ((d = readdir(dir)) != NULL) { | |
175 | struct worktree *linked = NULL; | |
176 | if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) | |
177 | continue; | |
ac6c561b | 178 | |
d4cddd66 NTND |
179 | if ((linked = get_linked_worktree(d->d_name))) { |
180 | ALLOC_GROW(list, counter + 1, alloc); | |
181 | list[counter++] = linked; | |
182 | } | |
51934904 MR |
183 | } |
184 | closedir(dir); | |
185 | } | |
186 | ALLOC_GROW(list, counter + 1, alloc); | |
187 | list[counter] = NULL; | |
188 | return list; | |
189 | } | |
190 | ||
191 | char *find_shared_symref(const char *symref, const char *target) | |
192 | { | |
193 | char *existing = NULL; | |
194 | struct strbuf path = STRBUF_INIT; | |
195 | struct strbuf sb = STRBUF_INIT; | |
196 | struct worktree **worktrees = get_worktrees(); | |
197 | int i = 0; | |
198 | ||
199 | for (i = 0; worktrees[i]; i++) { | |
200 | strbuf_reset(&path); | |
201 | strbuf_reset(&sb); | |
202 | strbuf_addf(&path, "%s/%s", worktrees[i]->git_dir, symref); | |
203 | ||
204 | if (parse_ref(path.buf, &sb, NULL)) { | |
ac6c561b | 205 | continue; |
51934904 MR |
206 | } |
207 | ||
208 | if (!strcmp(sb.buf, target)) { | |
209 | existing = xstrdup(worktrees[i]->path); | |
210 | break; | |
211 | } | |
ac6c561b | 212 | } |
51934904 MR |
213 | |
214 | strbuf_release(&path); | |
215 | strbuf_release(&sb); | |
216 | free_worktrees(worktrees); | |
ac6c561b MR |
217 | |
218 | return existing; | |
219 | } |