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