repository.c

   1 #include "git-compat-util.h"
   2 #include "abspath.h"
   3 #include "repository.h"
   4 #include "object-store-ll.h"
   5 #include "config.h"
   6 #include "object.h"
   7 #include "lockfile.h"
   8 #include "path.h"
   9 #include "read-cache-ll.h"
  10 #include "remote.h"
  11 #include "setup.h"
  12 #include "loose.h"
  13 #include "submodule-config.h"
  14 #include "sparse-index.h"
  15 #include "trace2.h"
  16 #include "promisor-remote.h"
  17
  18 /* The main repository */
  19 static struct repository the_repo;
  20 struct repository *the_repository = &the_repo;
  21
  22 void initialize_repository(struct repository *repo)
  23 {
  24         repo->objects = raw_object_store_new();
  25         repo->remote_state = remote_state_new();
  26         repo->parsed_objects = parsed_object_pool_new();
  27         ALLOC_ARRAY(repo->index, 1);
  28         index_state_init(repo->index, repo);
  29 }
  30
  31 static void expand_base_dir(char **out, const char *in,
  32                             const char *base_dir, const char *def_in)
  33 {
  34         free(*out);
  35         if (in)
  36                 *out = xstrdup(in);
  37         else
  38                 *out = xstrfmt("%s/%s", base_dir, def_in);
  39 }
  40
  41 static void repo_set_commondir(struct repository *repo,
  42                                const char *commondir)
  43 {
  44         struct strbuf sb = STRBUF_INIT;
  45
  46         free(repo->commondir);
  47
  48         if (commondir) {
  49                 repo->different_commondir = 1;
  50                 repo->commondir = xstrdup(commondir);
  51                 return;
  52         }
  53
  54         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  55         repo->commondir = strbuf_detach(&sb, NULL);
  56 }
  57
  58 void repo_set_gitdir(struct repository *repo,
  59                      const char *root,
  60                      const struct set_gitdir_args *o)
  61 {
  62         const char *gitfile = read_gitfile(root);
  63         /*
  64          * repo->gitdir is saved because the caller could pass "root"
  65          * that also points to repo->gitdir. We want to keep it alive
  66          * until after xstrdup(root). Then we can free it.
  67          */
  68         char *old_gitdir = repo->gitdir;
  69
  70         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  71         free(old_gitdir);
  72
  73         repo_set_commondir(repo, o->commondir);
  74
  75         if (!repo->objects->odb) {
  76                 CALLOC_ARRAY(repo->objects->odb, 1);
  77                 repo->objects->odb_tail = &repo->objects->odb->next;
  78         }
  79         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  80                         repo->commondir, "objects");
  81
  82         repo->objects->odb->disable_ref_updates = o->disable_ref_updates;
  83
  84         free(repo->objects->alternate_db);
  85         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  86         expand_base_dir(&repo->graft_file, o->graft_file,
  87                         repo->commondir, "info/grafts");
  88         expand_base_dir(&repo->index_file, o->index_file,
  89                         repo->gitdir, "index");
  90 }
  91
  92 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  93 {
  94         repo->hash_algo = &hash_algos[hash_algo];
  95 }
  96
  97 void repo_set_compat_hash_algo(struct repository *repo, int algo)
  98 {
  99         if (hash_algo_by_ptr(repo->hash_algo) == algo)
 100                 BUG("hash_algo and compat_hash_algo match");
 101         repo->compat_hash_algo = algo ? &hash_algos[algo] : NULL;
 102         if (repo->compat_hash_algo)
 103                 repo_read_loose_object_map(repo);
 104 }
 105
 106 void repo_set_ref_storage_format(struct repository *repo, unsigned int format)
 107 {
 108         repo->ref_storage_format = format;
 109 }
 110
 111 /*
 112  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 113  * Return 0 upon success and a non-zero value upon failure.
 114  */
 115 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 116 {
 117         int ret = 0;
 118         int error = 0;
 119         char *abspath = NULL;
 120         const char *resolved_gitdir;
 121         struct set_gitdir_args args = { NULL };
 122
 123         abspath = real_pathdup(gitdir, 0);
 124         if (!abspath) {
 125                 ret = -1;
 126                 goto out;
 127         }
 128
 129         /* 'gitdir' must reference the gitdir directly */
 130         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 131         if (!resolved_gitdir) {
 132                 ret = -1;
 133                 goto out;
 134         }
 135
 136         repo_set_gitdir(repo, resolved_gitdir, &args);
 137
 138 out:
 139         free(abspath);
 140         return ret;
 141 }
 142
 143 void repo_set_worktree(struct repository *repo, const char *path)
 144 {
 145         repo->worktree = real_pathdup(path, 1);
 146
 147         trace2_def_repo(repo);
 148 }
 149
 150 static int read_and_verify_repository_format(struct repository_format *format,
 151                                              const char *commondir)
 152 {
 153         int ret = 0;
 154         struct strbuf sb = STRBUF_INIT;
 155
 156         strbuf_addf(&sb, "%s/config", commondir);
 157         read_repository_format(format, sb.buf);
 158         strbuf_reset(&sb);
 159
 160         if (verify_repository_format(format, &sb) < 0) {
 161                 warning("%s", sb.buf);
 162                 ret = -1;
 163         }
 164
 165         strbuf_release(&sb);
 166         return ret;
 167 }
 168
 169 /*
 170  * Initialize 'repo' based on the provided 'gitdir'.
 171  * Return 0 upon success and a non-zero value upon failure.
 172  */
 173 int repo_init(struct repository *repo,
 174               const char *gitdir,
 175               const char *worktree)
 176 {
 177         struct repository_format format = REPOSITORY_FORMAT_INIT;
 178         memset(repo, 0, sizeof(*repo));
 179
 180         initialize_repository(repo);
 181
 182         if (repo_init_gitdir(repo, gitdir))
 183                 goto error;
 184
 185         if (read_and_verify_repository_format(&format, repo->commondir))
 186                 goto error;
 187
 188         repo_set_hash_algo(repo, format.hash_algo);
 189         repo_set_compat_hash_algo(repo, format.compat_hash_algo);
 190         repo_set_ref_storage_format(repo, format.ref_storage_format);
 191         repo->repository_format_worktree_config = format.worktree_config;
 192
 193         /* take ownership of format.partial_clone */
 194         repo->repository_format_partial_clone = format.partial_clone;
 195         format.partial_clone = NULL;
 196
 197         if (worktree)
 198                 repo_set_worktree(repo, worktree);
 199
 200         if (repo->compat_hash_algo)
 201                 repo_read_loose_object_map(repo);
 202
 203         clear_repository_format(&format);
 204         return 0;
 205
 206 error:
 207         repo_clear(repo);
 208         return -1;
 209 }
 210
 211 int repo_submodule_init(struct repository *subrepo,
 212                         struct repository *superproject,
 213                         const char *path,
 214                         const struct object_id *treeish_name)
 215 {
 216         struct strbuf gitdir = STRBUF_INIT;
 217         struct strbuf worktree = STRBUF_INIT;
 218         int ret = 0;
 219
 220         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 221         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 222
 223         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
 224                 /*
 225                  * If initialization fails then it may be due to the submodule
 226                  * not being populated in the superproject's worktree.  Instead
 227                  * we can try to initialize the submodule by finding it's gitdir
 228                  * in the superproject's 'modules' directory.  In this case the
 229                  * submodule would not have a worktree.
 230                  */
 231                 const struct submodule *sub =
 232                         submodule_from_path(superproject, treeish_name, path);
 233                 if (!sub) {
 234                         ret = -1;
 235                         goto out;
 236                 }
 237
 238                 strbuf_reset(&gitdir);
 239                 submodule_name_to_gitdir(&gitdir, superproject, sub->name);
 240
 241                 if (repo_init(subrepo, gitdir.buf, NULL)) {
 242                         ret = -1;
 243                         goto out;
 244                 }
 245         }
 246
 247         subrepo->submodule_prefix = xstrfmt("%s%s/",
 248                                             superproject->submodule_prefix ?
 249                                             superproject->submodule_prefix :
 250                                             "", path);
 251
 252 out:
 253         strbuf_release(&gitdir);
 254         strbuf_release(&worktree);
 255         return ret;
 256 }
 257
 258 static void repo_clear_path_cache(struct repo_path_cache *cache)
 259 {
 260         FREE_AND_NULL(cache->squash_msg);
 261         FREE_AND_NULL(cache->squash_msg);
 262         FREE_AND_NULL(cache->merge_msg);
 263         FREE_AND_NULL(cache->merge_rr);
 264         FREE_AND_NULL(cache->merge_mode);
 265         FREE_AND_NULL(cache->merge_head);
 266         FREE_AND_NULL(cache->fetch_head);
 267         FREE_AND_NULL(cache->shallow);
 268 }
 269
 270 void repo_clear(struct repository *repo)
 271 {
 272         FREE_AND_NULL(repo->gitdir);
 273         FREE_AND_NULL(repo->commondir);
 274         FREE_AND_NULL(repo->graft_file);
 275         FREE_AND_NULL(repo->index_file);
 276         FREE_AND_NULL(repo->worktree);
 277         FREE_AND_NULL(repo->submodule_prefix);
 278
 279         raw_object_store_clear(repo->objects);
 280         FREE_AND_NULL(repo->objects);
 281
 282         parsed_object_pool_clear(repo->parsed_objects);
 283         FREE_AND_NULL(repo->parsed_objects);
 284
 285         if (repo->config) {
 286                 git_configset_clear(repo->config);
 287                 FREE_AND_NULL(repo->config);
 288         }
 289
 290         if (repo->submodule_cache) {
 291                 submodule_cache_free(repo->submodule_cache);
 292                 repo->submodule_cache = NULL;
 293         }
 294
 295         if (repo->index) {
 296                 discard_index(repo->index);
 297                 FREE_AND_NULL(repo->index);
 298         }
 299
 300         if (repo->promisor_remote_config) {
 301                 promisor_remote_clear(repo->promisor_remote_config);
 302                 FREE_AND_NULL(repo->promisor_remote_config);
 303         }
 304
 305         if (repo->remote_state) {
 306                 remote_state_clear(repo->remote_state);
 307                 FREE_AND_NULL(repo->remote_state);
 308         }
 309
 310         repo_clear_path_cache(&repo->cached_paths);
 311 }
 312
 313 int repo_read_index(struct repository *repo)
 314 {
 315         int res;
 316
 317         /* Complete the double-reference */
 318         if (!repo->index) {
 319                 ALLOC_ARRAY(repo->index, 1);
 320                 index_state_init(repo->index, repo);
 321         } else if (repo->index->repo != repo) {
 322                 BUG("repo's index should point back at itself");
 323         }
 324
 325         res = read_index_from(repo->index, repo->index_file, repo->gitdir);
 326
 327         prepare_repo_settings(repo);
 328         if (repo->settings.command_requires_full_index)
 329                 ensure_full_index(repo->index);
 330
 331         /*
 332          * If sparse checkouts are in use, check whether paths with the
 333          * SKIP_WORKTREE attribute are missing from the worktree; if not,
 334          * clear that attribute for that path.
 335          */
 336         clear_skip_worktree_from_present_files(repo->index);
 337
 338         return res;
 339 }
 340
 341 int repo_hold_locked_index(struct repository *repo,
 342                            struct lock_file *lf,
 343                            int flags)
 344 {
 345         if (!repo->index_file)
 346                 BUG("the repo hasn't been setup");
 347         return hold_lock_file_for_update(lf, repo->index_file, flags);
 348 }