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