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;
  21
  22 static 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 void initialize_the_repository(void)
  32 {
  33         the_repository = &the_repo;
  34         initialize_repository(the_repository);
  35         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  36 }
  37
  38 static void expand_base_dir(char **out, const char *in,
  39                             const char *base_dir, const char *def_in)
  40 {
  41         free(*out);
  42         if (in)
  43                 *out = xstrdup(in);
  44         else
  45                 *out = xstrfmt("%s/%s", base_dir, def_in);
  46 }
  47
  48 static void repo_set_commondir(struct repository *repo,
  49                                const char *commondir)
  50 {
  51         struct strbuf sb = STRBUF_INIT;
  52
  53         free(repo->commondir);
  54
  55         if (commondir) {
  56                 repo->different_commondir = 1;
  57                 repo->commondir = xstrdup(commondir);
  58                 return;
  59         }
  60
  61         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  62         repo->commondir = strbuf_detach(&sb, NULL);
  63 }
  64
  65 void repo_set_gitdir(struct repository *repo,
  66                      const char *root,
  67                      const struct set_gitdir_args *o)
  68 {
  69         const char *gitfile = read_gitfile(root);
  70         /*
  71          * repo->gitdir is saved because the caller could pass "root"
  72          * that also points to repo->gitdir. We want to keep it alive
  73          * until after xstrdup(root). Then we can free it.
  74          */
  75         char *old_gitdir = repo->gitdir;
  76
  77         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  78         free(old_gitdir);
  79
  80         repo_set_commondir(repo, o->commondir);
  81
  82         if (!repo->objects->odb) {
  83                 CALLOC_ARRAY(repo->objects->odb, 1);
  84                 repo->objects->odb_tail = &repo->objects->odb->next;
  85         }
  86         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  87                         repo->commondir, "objects");
  88
  89         repo->objects->odb->disable_ref_updates = o->disable_ref_updates;
  90
  91         free(repo->objects->alternate_db);
  92         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  93         expand_base_dir(&repo->graft_file, o->graft_file,
  94                         repo->commondir, "info/grafts");
  95         expand_base_dir(&repo->index_file, o->index_file,
  96                         repo->gitdir, "index");
  97 }
  98
  99 void repo_set_hash_algo(struct repository *repo, int hash_algo)
 100 {
 101         repo->hash_algo = &hash_algos[hash_algo];
 102 }
 103
 104 void repo_set_compat_hash_algo(struct repository *repo, int algo)
 105 {
 106         if (hash_algo_by_ptr(repo->hash_algo) == algo)
 107                 BUG("hash_algo and compat_hash_algo match");
 108         repo->compat_hash_algo = algo ? &hash_algos[algo] : NULL;
 109         if (repo->compat_hash_algo)
 110                 repo_read_loose_object_map(repo);
 111 }
 112
 113 void repo_set_ref_storage_format(struct repository *repo, unsigned int format)
 114 {
 115         repo->ref_storage_format = format;
 116 }
 117
 118 /*
 119  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 120  * Return 0 upon success and a non-zero value upon failure.
 121  */
 122 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 123 {
 124         int ret = 0;
 125         int error = 0;
 126         char *abspath = NULL;
 127         const char *resolved_gitdir;
 128         struct set_gitdir_args args = { NULL };
 129
 130         abspath = real_pathdup(gitdir, 0);
 131         if (!abspath) {
 132                 ret = -1;
 133                 goto out;
 134         }
 135
 136         /* 'gitdir' must reference the gitdir directly */
 137         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 138         if (!resolved_gitdir) {
 139                 ret = -1;
 140                 goto out;
 141         }
 142
 143         repo_set_gitdir(repo, resolved_gitdir, &args);
 144
 145 out:
 146         free(abspath);
 147         return ret;
 148 }
 149
 150 void repo_set_worktree(struct repository *repo, const char *path)
 151 {
 152         repo->worktree = real_pathdup(path, 1);
 153
 154         trace2_def_repo(repo);
 155 }
 156
 157 static int read_and_verify_repository_format(struct repository_format *format,
 158                                              const char *commondir)
 159 {
 160         int ret = 0;
 161         struct strbuf sb = STRBUF_INIT;
 162
 163         strbuf_addf(&sb, "%s/config", commondir);
 164         read_repository_format(format, sb.buf);
 165         strbuf_reset(&sb);
 166
 167         if (verify_repository_format(format, &sb) < 0) {
 168                 warning("%s", sb.buf);
 169                 ret = -1;
 170         }
 171
 172         strbuf_release(&sb);
 173         return ret;
 174 }
 175
 176 /*
 177  * Initialize 'repo' based on the provided 'gitdir'.
 178  * Return 0 upon success and a non-zero value upon failure.
 179  */
 180 int repo_init(struct repository *repo,
 181               const char *gitdir,
 182               const char *worktree)
 183 {
 184         struct repository_format format = REPOSITORY_FORMAT_INIT;
 185         memset(repo, 0, sizeof(*repo));
 186
 187         initialize_repository(repo);
 188
 189         if (repo_init_gitdir(repo, gitdir))
 190                 goto error;
 191
 192         if (read_and_verify_repository_format(&format, repo->commondir))
 193                 goto error;
 194
 195         repo_set_hash_algo(repo, format.hash_algo);
 196         repo_set_compat_hash_algo(repo, format.compat_hash_algo);
 197         repo_set_ref_storage_format(repo, format.ref_storage_format);
 198         repo->repository_format_worktree_config = format.worktree_config;
 199
 200         /* take ownership of format.partial_clone */
 201         repo->repository_format_partial_clone = format.partial_clone;
 202         format.partial_clone = NULL;
 203
 204         if (worktree)
 205                 repo_set_worktree(repo, worktree);
 206
 207         if (repo->compat_hash_algo)
 208                 repo_read_loose_object_map(repo);
 209
 210         clear_repository_format(&format);
 211         return 0;
 212
 213 error:
 214         repo_clear(repo);
 215         return -1;
 216 }
 217
 218 int repo_submodule_init(struct repository *subrepo,
 219                         struct repository *superproject,
 220                         const char *path,
 221                         const struct object_id *treeish_name)
 222 {
 223         struct strbuf gitdir = STRBUF_INIT;
 224         struct strbuf worktree = STRBUF_INIT;
 225         int ret = 0;
 226
 227         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 228         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 229
 230         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
 231                 /*
 232                  * If initialization fails then it may be due to the submodule
 233                  * not being populated in the superproject's worktree.  Instead
 234                  * we can try to initialize the submodule by finding it's gitdir
 235                  * in the superproject's 'modules' directory.  In this case the
 236                  * submodule would not have a worktree.
 237                  */
 238                 const struct submodule *sub =
 239                         submodule_from_path(superproject, treeish_name, path);
 240                 if (!sub) {
 241                         ret = -1;
 242                         goto out;
 243                 }
 244
 245                 strbuf_reset(&gitdir);
 246                 submodule_name_to_gitdir(&gitdir, superproject, sub->name);
 247
 248                 if (repo_init(subrepo, gitdir.buf, NULL)) {
 249                         ret = -1;
 250                         goto out;
 251                 }
 252         }
 253
 254         subrepo->submodule_prefix = xstrfmt("%s%s/",
 255                                             superproject->submodule_prefix ?
 256                                             superproject->submodule_prefix :
 257                                             "", path);
 258
 259 out:
 260         strbuf_release(&gitdir);
 261         strbuf_release(&worktree);
 262         return ret;
 263 }
 264
 265 static void repo_clear_path_cache(struct repo_path_cache *cache)
 266 {
 267         FREE_AND_NULL(cache->squash_msg);
 268         FREE_AND_NULL(cache->squash_msg);
 269         FREE_AND_NULL(cache->merge_msg);
 270         FREE_AND_NULL(cache->merge_rr);
 271         FREE_AND_NULL(cache->merge_mode);
 272         FREE_AND_NULL(cache->merge_head);
 273         FREE_AND_NULL(cache->fetch_head);
 274         FREE_AND_NULL(cache->shallow);
 275 }
 276
 277 void repo_clear(struct repository *repo)
 278 {
 279         FREE_AND_NULL(repo->gitdir);
 280         FREE_AND_NULL(repo->commondir);
 281         FREE_AND_NULL(repo->graft_file);
 282         FREE_AND_NULL(repo->index_file);
 283         FREE_AND_NULL(repo->worktree);
 284         FREE_AND_NULL(repo->submodule_prefix);
 285
 286         raw_object_store_clear(repo->objects);
 287         FREE_AND_NULL(repo->objects);
 288
 289         parsed_object_pool_clear(repo->parsed_objects);
 290         FREE_AND_NULL(repo->parsed_objects);
 291
 292         if (repo->config) {
 293                 git_configset_clear(repo->config);
 294                 FREE_AND_NULL(repo->config);
 295         }
 296
 297         if (repo->submodule_cache) {
 298                 submodule_cache_free(repo->submodule_cache);
 299                 repo->submodule_cache = NULL;
 300         }
 301
 302         if (repo->index) {
 303                 discard_index(repo->index);
 304                 FREE_AND_NULL(repo->index);
 305         }
 306
 307         if (repo->promisor_remote_config) {
 308                 promisor_remote_clear(repo->promisor_remote_config);
 309                 FREE_AND_NULL(repo->promisor_remote_config);
 310         }
 311
 312         if (repo->remote_state) {
 313                 remote_state_clear(repo->remote_state);
 314                 FREE_AND_NULL(repo->remote_state);
 315         }
 316
 317         repo_clear_path_cache(&repo->cached_paths);
 318 }
 319
 320 int repo_read_index(struct repository *repo)
 321 {
 322         int res;
 323
 324         /* Complete the double-reference */
 325         if (!repo->index) {
 326                 ALLOC_ARRAY(repo->index, 1);
 327                 index_state_init(repo->index, repo);
 328         } else if (repo->index->repo != repo) {
 329                 BUG("repo's index should point back at itself");
 330         }
 331
 332         res = read_index_from(repo->index, repo->index_file, repo->gitdir);
 333
 334         prepare_repo_settings(repo);
 335         if (repo->settings.command_requires_full_index)
 336                 ensure_full_index(repo->index);
 337
 338         /*
 339          * If sparse checkouts are in use, check whether paths with the
 340          * SKIP_WORKTREE attribute are missing from the worktree; if not,
 341          * clear that attribute for that path.
 342          */
 343         clear_skip_worktree_from_present_files(repo->index);
 344
 345         return res;
 346 }
 347
 348 int repo_hold_locked_index(struct repository *repo,
 349                            struct lock_file *lf,
 350                            int flags)
 351 {
 352         if (!repo->index_file)
 353                 BUG("the repo hasn't been setup");
 354         return hold_lock_file_for_update(lf, repo->index_file, flags);
 355 }