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