worktree.c

   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"
   7
   8 void free_worktrees(struct worktree **worktrees)
   9 {
  10         int i = 0;
  11
  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]);
  18         }
  19         free (worktrees);
  20 }
  21
  22 /*
  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).
  25  *
  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.
  29  *
  30  * return -1 if the ref is not a proper ref, 0 otherwise (success)
  31  */
  32 static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached)
  33 {
  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;
  51                 }
  52         } else
  53                 return -1;
  54         return 0;
  55 }
  56
  57 /**
  58  * Add the head_sha1 and head_ref (if not detached) to the given worktree
  59  */
  60 static void add_head_info(struct strbuf *head_ref, struct worktree *worktree)
  61 {
  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);
  68                 }
  69         }
  70 }
  71
  72 /**
  73  * get the main worktree
  74  */
  75 static struct worktree *get_main_worktree(void)
  76 {
  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;
  83
  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, "/.");
  88
  89         strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
  90
  91         if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
  92                 goto done;
  93
  94         worktree = xmalloc(sizeof(struct worktree));
  95         worktree->path = strbuf_detach(&worktree_path, NULL);
  96         worktree->id = NULL;
  97         worktree->is_bare = is_bare;
  98         worktree->head_ref = NULL;
  99         worktree->is_detached = is_detached;
 100         worktree->is_current = 0;
 101         add_head_info(&head_ref, worktree);
 102         worktree->lock_reason = NULL;
 103         worktree->lock_reason_valid = 0;
 104
 105 done:
 106         strbuf_release(&path);
 107         strbuf_release(&worktree_path);
 108         strbuf_release(&head_ref);
 109         return worktree;
 110 }
 111
 112 static struct worktree *get_linked_worktree(const char *id)
 113 {
 114         struct worktree *worktree = NULL;
 115         struct strbuf path = STRBUF_INIT;
 116         struct strbuf worktree_path = STRBUF_INIT;
 117         struct strbuf head_ref = STRBUF_INIT;
 118         int is_detached = 0;
 119
 120         if (!id)
 121                 die("Missing linked worktree name");
 122
 123         strbuf_git_common_path(&path, "worktrees/%s/gitdir", id);
 124         if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
 125                 /* invalid gitdir file */
 126                 goto done;
 127
 128         strbuf_rtrim(&worktree_path);
 129         if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
 130                 strbuf_reset(&worktree_path);
 131                 strbuf_add_absolute_path(&worktree_path, ".");
 132                 strbuf_strip_suffix(&worktree_path, "/.");
 133         }
 134
 135         strbuf_reset(&path);
 136         strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);
 137
 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->id = xstrdup(id);
 144         worktree->is_bare = 0;
 145         worktree->head_ref = NULL;
 146         worktree->is_detached = is_detached;
 147         worktree->is_current = 0;
 148         add_head_info(&head_ref, worktree);
 149         worktree->lock_reason = NULL;
 150         worktree->lock_reason_valid = 0;
 151
 152 done:
 153         strbuf_release(&path);
 154         strbuf_release(&worktree_path);
 155         strbuf_release(&head_ref);
 156         return worktree;
 157 }
 158
 159 static void mark_current_worktree(struct worktree **worktrees)
 160 {
 161         char *git_dir = xstrdup(absolute_path(get_git_dir()));
 162         int i;
 163
 164         for (i = 0; worktrees[i]; i++) {
 165                 struct worktree *wt = worktrees[i];
 166                 const char *wt_git_dir = get_worktree_git_dir(wt);
 167
 168                 if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) {
 169                         wt->is_current = 1;
 170                         break;
 171                 }
 172         }
 173         free(git_dir);
 174 }
 175
 176 struct worktree **get_worktrees(void)
 177 {
 178         struct worktree **list = NULL;
 179         struct strbuf path = STRBUF_INIT;
 180         DIR *dir;
 181         struct dirent *d;
 182         int counter = 0, alloc = 2;
 183
 184         list = xmalloc(alloc * sizeof(struct worktree *));
 185
 186         if ((list[counter] = get_main_worktree()))
 187                 counter++;
 188
 189         strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
 190         dir = opendir(path.buf);
 191         strbuf_release(&path);
 192         if (dir) {
 193                 while ((d = readdir(dir)) != NULL) {
 194                         struct worktree *linked = NULL;
 195                         if (is_dot_or_dotdot(d->d_name))
 196                                 continue;
 197
 198                         if ((linked = get_linked_worktree(d->d_name))) {
 199                                 ALLOC_GROW(list, counter + 1, alloc);
 200                                 list[counter++] = linked;
 201                         }
 202                 }
 203                 closedir(dir);
 204         }
 205         ALLOC_GROW(list, counter + 1, alloc);
 206         list[counter] = NULL;
 207
 208         mark_current_worktree(list);
 209         return list;
 210 }
 211
 212 const char *get_worktree_git_dir(const struct worktree *wt)
 213 {
 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);
 220 }
 221
 222 static struct worktree *find_worktree_by_suffix(struct worktree **list,
 223                                                 const char *suffix)
 224 {
 225         struct worktree *found = NULL;
 226         int nr_found = 0, suffixlen;
 227
 228         suffixlen = strlen(suffix);
 229         if (!suffixlen)
 230                 return NULL;
 231
 232         for (; *list && nr_found < 2; list++) {
 233                 const char      *path    = (*list)->path;
 234                 int              pathlen = strlen(path);
 235                 int              start   = pathlen - suffixlen;
 236
 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++;
 242                 }
 243         }
 244         return nr_found == 1 ? found : NULL;
 245 }
 246
 247 struct worktree *find_worktree(struct worktree **list,
 248                                const char *prefix,
 249                                const char *arg)
 250 {
 251         struct worktree *wt;
 252         char *path;
 253
 254         if ((wt = find_worktree_by_suffix(list, arg)))
 255                 return wt;
 256
 257         arg = prefix_filename(prefix, strlen(prefix), arg);
 258         path = real_pathdup(arg);
 259         for (; *list; list++)
 260                 if (!fspathcmp(path, real_path((*list)->path)))
 261                         break;
 262         free(path);
 263         return *list;
 264 }
 265
 266 int is_main_worktree(const struct worktree *wt)
 267 {
 268         return !wt->id;
 269 }
 270
 271 const char *is_worktree_locked(struct worktree *wt)
 272 {
 273         assert(!is_main_worktree(wt));
 274
 275         if (!wt->lock_reason_valid) {
 276                 struct strbuf path = STRBUF_INIT;
 277
 278                 strbuf_addstr(&path, worktree_git_path(wt, "locked"));
 279                 if (file_exists(path.buf)) {
 280                         struct strbuf lock_reason = STRBUF_INIT;
 281                         if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)
 282                                 die_errno(_("failed to read '%s'"), path.buf);
 283                         strbuf_trim(&lock_reason);
 284                         wt->lock_reason = strbuf_detach(&lock_reason, NULL);
 285                 } else
 286                         wt->lock_reason = NULL;
 287                 wt->lock_reason_valid = 1;
 288                 strbuf_release(&path);
 289         }
 290
 291         return wt->lock_reason;
 292 }
 293
 294 int is_worktree_being_rebased(const struct worktree *wt,
 295                               const char *target)
 296 {
 297         struct wt_status_state state;
 298         int found_rebase;
 299
 300         memset(&state, 0, sizeof(state));
 301         found_rebase = wt_status_check_rebase(wt, &state) &&
 302                 ((state.rebase_in_progress ||
 303                   state.rebase_interactive_in_progress) &&
 304                  state.branch &&
 305                  starts_with(target, "refs/heads/") &&
 306                  !strcmp(state.branch, target + strlen("refs/heads/")));
 307         free(state.branch);
 308         free(state.onto);
 309         return found_rebase;
 310 }
 311
 312 int is_worktree_being_bisected(const struct worktree *wt,
 313                                const char *target)
 314 {
 315         struct wt_status_state state;
 316         int found_rebase;
 317
 318         memset(&state, 0, sizeof(state));
 319         found_rebase = wt_status_check_bisect(wt, &state) &&
 320                 state.branch &&
 321                 starts_with(target, "refs/heads/") &&
 322                 !strcmp(state.branch, target + strlen("refs/heads/"));
 323         free(state.branch);
 324         return found_rebase;
 325 }
 326
 327 /*
 328  * note: this function should be able to detect shared symref even if
 329  * HEAD is temporarily detached (e.g. in the middle of rebase or
 330  * bisect). New commands that do similar things should update this
 331  * function as well.
 332  */
 333 const struct worktree *find_shared_symref(const char *symref,
 334                                           const char *target)
 335 {
 336         const struct worktree *existing = NULL;
 337         struct strbuf path = STRBUF_INIT;
 338         struct strbuf sb = STRBUF_INIT;
 339         static struct worktree **worktrees;
 340         int i = 0;
 341
 342         if (worktrees)
 343                 free_worktrees(worktrees);
 344         worktrees = get_worktrees();
 345
 346         for (i = 0; worktrees[i]; i++) {
 347                 struct worktree *wt = worktrees[i];
 348                 if (wt->is_bare)
 349                         continue;
 350
 351                 if (wt->is_detached && !strcmp(symref, "HEAD")) {
 352                         if (is_worktree_being_rebased(wt, target)) {
 353                                 existing = wt;
 354                                 break;
 355                         }
 356                         if (is_worktree_being_bisected(wt, target)) {
 357                                 existing = wt;
 358                                 break;
 359                         }
 360                 }
 361
 362                 strbuf_reset(&path);
 363                 strbuf_reset(&sb);
 364                 strbuf_addf(&path, "%s/%s",
 365                             get_worktree_git_dir(wt),
 366                             symref);
 367
 368                 if (parse_ref(path.buf, &sb, NULL)) {
 369                         continue;
 370                 }
 371
 372                 if (!strcmp(sb.buf, target)) {
 373                         existing = wt;
 374                         break;
 375                 }
 376         }
 377
 378         strbuf_release(&path);
 379         strbuf_release(&sb);
 380
 381         return existing;
 382 }