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  * Update head_sha1, head_ref and is_detached of the given worktree
  24  */
  25 static void add_head_info(struct worktree *wt)
  26 {
  27         int flags;
  28         const char *target;
  29
  30         target = refs_resolve_ref_unsafe(get_worktree_ref_store(wt),
  31                                          "HEAD",
  32                                          RESOLVE_REF_READING,
  33                                          wt->head_sha1, &flags);
  34         if (!target)
  35                 return;
  36
  37         if (flags & REF_ISSYMREF)
  38                 wt->head_ref = xstrdup(target);
  39         else
  40                 wt->is_detached = 1;
  41 }
  42
  43 /**
  44  * get the main worktree
  45  */
  46 static struct worktree *get_main_worktree(void)
  47 {
  48         struct worktree *worktree = NULL;
  49         struct strbuf path = STRBUF_INIT;
  50         struct strbuf worktree_path = STRBUF_INIT;
  51         int is_bare = 0;
  52
  53         strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
  54         is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
  55         if (is_bare)
  56                 strbuf_strip_suffix(&worktree_path, "/.");
  57
  58         strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
  59
  60         worktree = xcalloc(1, sizeof(*worktree));
  61         worktree->path = strbuf_detach(&worktree_path, NULL);
  62         worktree->is_bare = is_bare;
  63         add_head_info(worktree);
  64
  65         strbuf_release(&path);
  66         strbuf_release(&worktree_path);
  67         return worktree;
  68 }
  69
  70 static struct worktree *get_linked_worktree(const char *id)
  71 {
  72         struct worktree *worktree = NULL;
  73         struct strbuf path = STRBUF_INIT;
  74         struct strbuf worktree_path = STRBUF_INIT;
  75
  76         if (!id)
  77                 die("Missing linked worktree name");
  78
  79         strbuf_git_common_path(&path, "worktrees/%s/gitdir", id);
  80         if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
  81                 /* invalid gitdir file */
  82                 goto done;
  83
  84         strbuf_rtrim(&worktree_path);
  85         if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
  86                 strbuf_reset(&worktree_path);
  87                 strbuf_add_absolute_path(&worktree_path, ".");
  88                 strbuf_strip_suffix(&worktree_path, "/.");
  89         }
  90
  91         strbuf_reset(&path);
  92         strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);
  93
  94         worktree = xcalloc(1, sizeof(*worktree));
  95         worktree->path = strbuf_detach(&worktree_path, NULL);
  96         worktree->id = xstrdup(id);
  97         add_head_info(worktree);
  98
  99 done:
 100         strbuf_release(&path);
 101         strbuf_release(&worktree_path);
 102         return worktree;
 103 }
 104
 105 static void mark_current_worktree(struct worktree **worktrees)
 106 {
 107         char *git_dir = absolute_pathdup(get_git_dir());
 108         int i;
 109
 110         for (i = 0; worktrees[i]; i++) {
 111                 struct worktree *wt = worktrees[i];
 112                 const char *wt_git_dir = get_worktree_git_dir(wt);
 113
 114                 if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) {
 115                         wt->is_current = 1;
 116                         break;
 117                 }
 118         }
 119         free(git_dir);
 120 }
 121
 122 static int compare_worktree(const void *a_, const void *b_)
 123 {
 124         const struct worktree *const *a = a_;
 125         const struct worktree *const *b = b_;
 126         return fspathcmp((*a)->path, (*b)->path);
 127 }
 128
 129 struct worktree **get_worktrees(unsigned flags)
 130 {
 131         struct worktree **list = NULL;
 132         struct strbuf path = STRBUF_INIT;
 133         DIR *dir;
 134         struct dirent *d;
 135         int counter = 0, alloc = 2;
 136
 137         ALLOC_ARRAY(list, alloc);
 138
 139         list[counter++] = get_main_worktree();
 140
 141         strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
 142         dir = opendir(path.buf);
 143         strbuf_release(&path);
 144         if (dir) {
 145                 while ((d = readdir(dir)) != NULL) {
 146                         struct worktree *linked = NULL;
 147                         if (is_dot_or_dotdot(d->d_name))
 148                                 continue;
 149
 150                         if ((linked = get_linked_worktree(d->d_name))) {
 151                                 ALLOC_GROW(list, counter + 1, alloc);
 152                                 list[counter++] = linked;
 153                         }
 154                 }
 155                 closedir(dir);
 156         }
 157         ALLOC_GROW(list, counter + 1, alloc);
 158         list[counter] = NULL;
 159
 160         if (flags & GWT_SORT_LINKED)
 161                 /*
 162                  * don't sort the first item (main worktree), which will
 163                  * always be the first
 164                  */
 165                 QSORT(list + 1, counter - 1, compare_worktree);
 166
 167         mark_current_worktree(list);
 168         return list;
 169 }
 170
 171 const char *get_worktree_git_dir(const struct worktree *wt)
 172 {
 173         if (!wt)
 174                 return get_git_dir();
 175         else if (!wt->id)
 176                 return get_git_common_dir();
 177         else
 178                 return git_common_path("worktrees/%s", wt->id);
 179 }
 180
 181 static struct worktree *find_worktree_by_suffix(struct worktree **list,
 182                                                 const char *suffix)
 183 {
 184         struct worktree *found = NULL;
 185         int nr_found = 0, suffixlen;
 186
 187         suffixlen = strlen(suffix);
 188         if (!suffixlen)
 189                 return NULL;
 190
 191         for (; *list && nr_found < 2; list++) {
 192                 const char      *path    = (*list)->path;
 193                 int              pathlen = strlen(path);
 194                 int              start   = pathlen - suffixlen;
 195
 196                 /* suffix must start at directory boundary */
 197                 if ((!start || (start > 0 && is_dir_sep(path[start - 1]))) &&
 198                     !fspathcmp(suffix, path + start)) {
 199                         found = *list;
 200                         nr_found++;
 201                 }
 202         }
 203         return nr_found == 1 ? found : NULL;
 204 }
 205
 206 struct worktree *find_worktree(struct worktree **list,
 207                                const char *prefix,
 208                                const char *arg)
 209 {
 210         struct worktree *wt;
 211         char *path;
 212         char *to_free = NULL;
 213
 214         if ((wt = find_worktree_by_suffix(list, arg)))
 215                 return wt;
 216
 217         if (prefix)
 218                 arg = to_free = prefix_filename(prefix, arg);
 219         path = real_pathdup(arg, 1);
 220         for (; *list; list++)
 221                 if (!fspathcmp(path, real_path((*list)->path)))
 222                         break;
 223         free(path);
 224         free(to_free);
 225         return *list;
 226 }
 227
 228 int is_main_worktree(const struct worktree *wt)
 229 {
 230         return !wt->id;
 231 }
 232
 233 const char *is_worktree_locked(struct worktree *wt)
 234 {
 235         assert(!is_main_worktree(wt));
 236
 237         if (!wt->lock_reason_valid) {
 238                 struct strbuf path = STRBUF_INIT;
 239
 240                 strbuf_addstr(&path, worktree_git_path(wt, "locked"));
 241                 if (file_exists(path.buf)) {
 242                         struct strbuf lock_reason = STRBUF_INIT;
 243                         if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)
 244                                 die_errno(_("failed to read '%s'"), path.buf);
 245                         strbuf_trim(&lock_reason);
 246                         wt->lock_reason = strbuf_detach(&lock_reason, NULL);
 247                 } else
 248                         wt->lock_reason = NULL;
 249                 wt->lock_reason_valid = 1;
 250                 strbuf_release(&path);
 251         }
 252
 253         return wt->lock_reason;
 254 }
 255
 256 int is_worktree_being_rebased(const struct worktree *wt,
 257                               const char *target)
 258 {
 259         struct wt_status_state state;
 260         int found_rebase;
 261
 262         memset(&state, 0, sizeof(state));
 263         found_rebase = wt_status_check_rebase(wt, &state) &&
 264                 ((state.rebase_in_progress ||
 265                   state.rebase_interactive_in_progress) &&
 266                  state.branch &&
 267                  starts_with(target, "refs/heads/") &&
 268                  !strcmp(state.branch, target + strlen("refs/heads/")));
 269         free(state.branch);
 270         free(state.onto);
 271         return found_rebase;
 272 }
 273
 274 int is_worktree_being_bisected(const struct worktree *wt,
 275                                const char *target)
 276 {
 277         struct wt_status_state state;
 278         int found_rebase;
 279
 280         memset(&state, 0, sizeof(state));
 281         found_rebase = wt_status_check_bisect(wt, &state) &&
 282                 state.branch &&
 283                 starts_with(target, "refs/heads/") &&
 284                 !strcmp(state.branch, target + strlen("refs/heads/"));
 285         free(state.branch);
 286         return found_rebase;
 287 }
 288
 289 /*
 290  * note: this function should be able to detect shared symref even if
 291  * HEAD is temporarily detached (e.g. in the middle of rebase or
 292  * bisect). New commands that do similar things should update this
 293  * function as well.
 294  */
 295 const struct worktree *find_shared_symref(const char *symref,
 296                                           const char *target)
 297 {
 298         const struct worktree *existing = NULL;
 299         static struct worktree **worktrees;
 300         int i = 0;
 301
 302         if (worktrees)
 303                 free_worktrees(worktrees);
 304         worktrees = get_worktrees(0);
 305
 306         for (i = 0; worktrees[i]; i++) {
 307                 struct worktree *wt = worktrees[i];
 308                 const char *symref_target;
 309                 unsigned char sha1[20];
 310                 struct ref_store *refs;
 311                 int flags;
 312
 313                 if (wt->is_bare)
 314                         continue;
 315
 316                 if (wt->is_detached && !strcmp(symref, "HEAD")) {
 317                         if (is_worktree_being_rebased(wt, target)) {
 318                                 existing = wt;
 319                                 break;
 320                         }
 321                         if (is_worktree_being_bisected(wt, target)) {
 322                                 existing = wt;
 323                                 break;
 324                         }
 325                 }
 326
 327                 refs = get_worktree_ref_store(wt);
 328                 symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
 329                                                         sha1, &flags);
 330                 if ((flags & REF_ISSYMREF) && !strcmp(symref_target, target)) {
 331                         existing = wt;
 332                         break;
 333                 }
 334         }
 335
 336         return existing;
 337 }
 338
 339 int submodule_uses_worktrees(const char *path)
 340 {
 341         char *submodule_gitdir;
 342         struct strbuf sb = STRBUF_INIT;
 343         DIR *dir;
 344         struct dirent *d;
 345         int ret = 0;
 346         struct repository_format format;
 347
 348         submodule_gitdir = git_pathdup_submodule(path, "%s", "");
 349         if (!submodule_gitdir)
 350                 return 0;
 351
 352         /* The env would be set for the superproject. */
 353         get_common_dir_noenv(&sb, submodule_gitdir);
 354         free(submodule_gitdir);
 355
 356         /*
 357          * The check below is only known to be good for repository format
 358          * version 0 at the time of writing this code.
 359          */
 360         strbuf_addstr(&sb, "/config");
 361         read_repository_format(&format, sb.buf);
 362         if (format.version != 0) {
 363                 strbuf_release(&sb);
 364                 return 1;
 365         }
 366
 367         /* Replace config by worktrees. */
 368         strbuf_setlen(&sb, sb.len - strlen("config"));
 369         strbuf_addstr(&sb, "worktrees");
 370
 371         /* See if there is any file inside the worktrees directory. */
 372         dir = opendir(sb.buf);
 373         strbuf_release(&sb);
 374
 375         if (!dir)
 376                 return 0;
 377
 378         while ((d = readdir(dir)) != NULL) {
 379                 if (is_dot_or_dotdot(d->d_name))
 380                         continue;
 381
 382                 ret = 1;
 383                 break;
 384         }
 385         closedir(dir);
 386         return ret;
 387 }