repository.c

   1 /*
   2  * not really _using_ the compat macros, just make sure the_index
   3  * declaration matches the definition in this file.
   4  */
   5 #define USE_THE_INDEX_VARIABLE
   6 #include "cache.h"
   7 #include "abspath.h"
   8 #include "repository.h"
   9 #include "object-store.h"
  10 #include "config.h"
  11 #include "object.h"
  12 #include "lockfile.h"
  13 #include "remote.h"
  14 #include "setup.h"
  15 #include "submodule-config.h"
  16 #include "sparse-index.h"
  17 #include "promisor-remote.h"
  18
  19 /* The main repository */
  20 static struct repository the_repo;
  21 struct repository *the_repository;
  22 struct index_state the_index;
  23
  24 void initialize_the_repository(void)
  25 {
  26         the_repository = &the_repo;
  27
  28         the_repo.index = &the_index;
  29         the_repo.objects = raw_object_store_new();
  30         the_repo.remote_state = remote_state_new();
  31         the_repo.parsed_objects = parsed_object_pool_new();
  32
  33         index_state_init(&the_index, the_repository);
  34
  35         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  36 }
  37
  38 static void expand_base_dir(char **out, const char *in,
  39                             const char *base_dir, const char *def_in)
  40 {
  41         free(*out);
  42         if (in)
  43                 *out = xstrdup(in);
  44         else
  45                 *out = xstrfmt("%s/%s", base_dir, def_in);
  46 }
  47
  48 static void repo_set_commondir(struct repository *repo,
  49                                const char *commondir)
  50 {
  51         struct strbuf sb = STRBUF_INIT;
  52
  53         free(repo->commondir);
  54
  55         if (commondir) {
  56                 repo->different_commondir = 1;
  57                 repo->commondir = xstrdup(commondir);
  58                 return;
  59         }
  60
  61         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  62         repo->commondir = strbuf_detach(&sb, NULL);
  63 }
  64
  65 void repo_set_gitdir(struct repository *repo,
  66                      const char *root,
  67                      const struct set_gitdir_args *o)
  68 {
  69         const char *gitfile = read_gitfile(root);
  70         /*
  71          * repo->gitdir is saved because the caller could pass "root"
  72          * that also points to repo->gitdir. We want to keep it alive
  73          * until after xstrdup(root). Then we can free it.
  74          */
  75         char *old_gitdir = repo->gitdir;
  76
  77         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  78         free(old_gitdir);
  79
  80         repo_set_commondir(repo, o->commondir);
  81
  82         if (!repo->objects->odb) {
  83                 CALLOC_ARRAY(repo->objects->odb, 1);
  84                 repo->objects->odb_tail = &repo->objects->odb->next;
  85         }
  86         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  87                         repo->commondir, "objects");
  88
  89         repo->objects->odb->disable_ref_updates = o->disable_ref_updates;
  90
  91         free(repo->objects->alternate_db);
  92         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  93         expand_base_dir(&repo->graft_file, o->graft_file,
  94                         repo->commondir, "info/grafts");
  95         expand_base_dir(&repo->index_file, o->index_file,
  96                         repo->gitdir, "index");
  97 }
  98
  99 void repo_set_hash_algo(struct repository *repo, int hash_algo)
 100 {
 101         repo->hash_algo = &hash_algos[hash_algo];
 102 }
 103
 104 /*
 105  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 106  * Return 0 upon success and a non-zero value upon failure.
 107  */
 108 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 109 {
 110         int ret = 0;
 111         int error = 0;
 112         char *abspath = NULL;
 113         const char *resolved_gitdir;
 114         struct set_gitdir_args args = { NULL };
 115
 116         abspath = real_pathdup(gitdir, 0);
 117         if (!abspath) {
 118                 ret = -1;
 119                 goto out;
 120         }
 121
 122         /* 'gitdir' must reference the gitdir directly */
 123         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 124         if (!resolved_gitdir) {
 125                 ret = -1;
 126                 goto out;
 127         }
 128
 129         repo_set_gitdir(repo, resolved_gitdir, &args);
 130
 131 out:
 132         free(abspath);
 133         return ret;
 134 }
 135
 136 void repo_set_worktree(struct repository *repo, const char *path)
 137 {
 138         repo->worktree = real_pathdup(path, 1);
 139
 140         trace2_def_repo(repo);
 141 }
 142
 143 static int read_and_verify_repository_format(struct repository_format *format,
 144                                              const char *commondir)
 145 {
 146         int ret = 0;
 147         struct strbuf sb = STRBUF_INIT;
 148
 149         strbuf_addf(&sb, "%s/config", commondir);
 150         read_repository_format(format, sb.buf);
 151         strbuf_reset(&sb);
 152
 153         if (verify_repository_format(format, &sb) < 0) {
 154                 warning("%s", sb.buf);
 155                 ret = -1;
 156         }
 157
 158         strbuf_release(&sb);
 159         return ret;
 160 }
 161
 162 /*
 163  * Initialize 'repo' based on the provided 'gitdir'.
 164  * Return 0 upon success and a non-zero value upon failure.
 165  */
 166 int repo_init(struct repository *repo,
 167               const char *gitdir,
 168               const char *worktree)
 169 {
 170         struct repository_format format = REPOSITORY_FORMAT_INIT;
 171         memset(repo, 0, sizeof(*repo));
 172
 173         repo->objects = raw_object_store_new();
 174         repo->parsed_objects = parsed_object_pool_new();
 175         repo->remote_state = remote_state_new();
 176
 177         if (repo_init_gitdir(repo, gitdir))
 178                 goto error;
 179
 180         if (read_and_verify_repository_format(&format, repo->commondir))
 181                 goto error;
 182
 183         repo_set_hash_algo(repo, format.hash_algo);
 184
 185         /* take ownership of format.partial_clone */
 186         repo->repository_format_partial_clone = format.partial_clone;
 187         format.partial_clone = NULL;
 188
 189         if (worktree)
 190                 repo_set_worktree(repo, worktree);
 191
 192         clear_repository_format(&format);
 193         return 0;
 194
 195 error:
 196         repo_clear(repo);
 197         return -1;
 198 }
 199
 200 int repo_submodule_init(struct repository *subrepo,
 201                         struct repository *superproject,
 202                         const char *path,
 203                         const struct object_id *treeish_name)
 204 {
 205         struct strbuf gitdir = STRBUF_INIT;
 206         struct strbuf worktree = STRBUF_INIT;
 207         int ret = 0;
 208
 209         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 210         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 211
 212         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
 213                 /*
 214                  * If initialization fails then it may be due to the submodule
 215                  * not being populated in the superproject's worktree.  Instead
 216                  * we can try to initialize the submodule by finding it's gitdir
 217                  * in the superproject's 'modules' directory.  In this case the
 218                  * submodule would not have a worktree.
 219                  */
 220                 const struct submodule *sub =
 221                         submodule_from_path(superproject, treeish_name, path);
 222                 if (!sub) {
 223                         ret = -1;
 224                         goto out;
 225                 }
 226
 227                 strbuf_reset(&gitdir);
 228                 submodule_name_to_gitdir(&gitdir, superproject, sub->name);
 229
 230                 if (repo_init(subrepo, gitdir.buf, NULL)) {
 231                         ret = -1;
 232                         goto out;
 233                 }
 234         }
 235
 236         subrepo->submodule_prefix = xstrfmt("%s%s/",
 237                                             superproject->submodule_prefix ?
 238                                             superproject->submodule_prefix :
 239                                             "", path);
 240
 241 out:
 242         strbuf_release(&gitdir);
 243         strbuf_release(&worktree);
 244         return ret;
 245 }
 246
 247 static void repo_clear_path_cache(struct repo_path_cache *cache)
 248 {
 249         FREE_AND_NULL(cache->squash_msg);
 250         FREE_AND_NULL(cache->squash_msg);
 251         FREE_AND_NULL(cache->merge_msg);
 252         FREE_AND_NULL(cache->merge_rr);
 253         FREE_AND_NULL(cache->merge_mode);
 254         FREE_AND_NULL(cache->merge_head);
 255         FREE_AND_NULL(cache->merge_autostash);
 256         FREE_AND_NULL(cache->auto_merge);
 257         FREE_AND_NULL(cache->fetch_head);
 258         FREE_AND_NULL(cache->shallow);
 259 }
 260
 261 void repo_clear(struct repository *repo)
 262 {
 263         FREE_AND_NULL(repo->gitdir);
 264         FREE_AND_NULL(repo->commondir);
 265         FREE_AND_NULL(repo->graft_file);
 266         FREE_AND_NULL(repo->index_file);
 267         FREE_AND_NULL(repo->worktree);
 268         FREE_AND_NULL(repo->submodule_prefix);
 269
 270         raw_object_store_clear(repo->objects);
 271         FREE_AND_NULL(repo->objects);
 272
 273         parsed_object_pool_clear(repo->parsed_objects);
 274         FREE_AND_NULL(repo->parsed_objects);
 275
 276         if (repo->config) {
 277                 git_configset_clear(repo->config);
 278                 FREE_AND_NULL(repo->config);
 279         }
 280
 281         if (repo->submodule_cache) {
 282                 submodule_cache_free(repo->submodule_cache);
 283                 repo->submodule_cache = NULL;
 284         }
 285
 286         if (repo->index) {
 287                 discard_index(repo->index);
 288                 if (repo->index != &the_index)
 289                         FREE_AND_NULL(repo->index);
 290         }
 291
 292         if (repo->promisor_remote_config) {
 293                 promisor_remote_clear(repo->promisor_remote_config);
 294                 FREE_AND_NULL(repo->promisor_remote_config);
 295         }
 296
 297         if (repo->remote_state) {
 298                 remote_state_clear(repo->remote_state);
 299                 FREE_AND_NULL(repo->remote_state);
 300         }
 301
 302         repo_clear_path_cache(&repo->cached_paths);
 303 }
 304
 305 int repo_read_index(struct repository *repo)
 306 {
 307         int res;
 308
 309         /* Complete the double-reference */
 310         if (!repo->index) {
 311                 ALLOC_ARRAY(repo->index, 1);
 312                 index_state_init(repo->index, repo);
 313         } else if (repo->index->repo != repo) {
 314                 BUG("repo's index should point back at itself");
 315         }
 316
 317         res = read_index_from(repo->index, repo->index_file, repo->gitdir);
 318
 319         prepare_repo_settings(repo);
 320         if (repo->settings.command_requires_full_index)
 321                 ensure_full_index(repo->index);
 322
 323         /*
 324          * If sparse checkouts are in use, check whether paths with the
 325          * SKIP_WORKTREE attribute are missing from the worktree; if not,
 326          * clear that attribute for that path.
 327          */
 328         clear_skip_worktree_from_present_files(repo->index);
 329
 330         return res;
 331 }
 332
 333 int repo_hold_locked_index(struct repository *repo,
 334                            struct lock_file *lf,
 335                            int flags)
 336 {
 337         if (!repo->index_file)
 338                 BUG("the repo hasn't been setup");
 339         return hold_lock_file_for_update(lf, repo->index_file, flags);
 340 }