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