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 "setup.h"
  15 #include "submodule-config.h"
  16 #include "sparse-index.h"
  17 #include "trace2.h"
  18 #include "promisor-remote.h"
  19
  20 /* The main repository */
  21 static struct repository the_repo;
  22 struct repository *the_repository;
  23 struct index_state the_index;
  24
  25 void initialize_the_repository(void)
  26 {
  27         the_repository = &the_repo;
  28
  29         the_repo.index = &the_index;
  30         the_repo.objects = raw_object_store_new();
  31         the_repo.remote_state = remote_state_new();
  32         the_repo.parsed_objects = parsed_object_pool_new();
  33
  34         index_state_init(&the_index, the_repository);
  35
  36         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  37 }
  38
  39 static void expand_base_dir(char **out, const char *in,
  40                             const char *base_dir, const char *def_in)
  41 {
  42         free(*out);
  43         if (in)
  44                 *out = xstrdup(in);
  45         else
  46                 *out = xstrfmt("%s/%s", base_dir, def_in);
  47 }
  48
  49 static void repo_set_commondir(struct repository *repo,
  50                                const char *commondir)
  51 {
  52         struct strbuf sb = STRBUF_INIT;
  53
  54         free(repo->commondir);
  55
  56         if (commondir) {
  57                 repo->different_commondir = 1;
  58                 repo->commondir = xstrdup(commondir);
  59                 return;
  60         }
  61
  62         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  63         repo->commondir = strbuf_detach(&sb, NULL);
  64 }
  65
  66 void repo_set_gitdir(struct repository *repo,
  67                      const char *root,
  68                      const struct set_gitdir_args *o)
  69 {
  70         const char *gitfile = read_gitfile(root);
  71         /*
  72          * repo->gitdir is saved because the caller could pass "root"
  73          * that also points to repo->gitdir. We want to keep it alive
  74          * until after xstrdup(root). Then we can free it.
  75          */
  76         char *old_gitdir = repo->gitdir;
  77
  78         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  79         free(old_gitdir);
  80
  81         repo_set_commondir(repo, o->commondir);
  82
  83         if (!repo->objects->odb) {
  84                 CALLOC_ARRAY(repo->objects->odb, 1);
  85                 repo->objects->odb_tail = &repo->objects->odb->next;
  86         }
  87         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  88                         repo->commondir, "objects");
  89
  90         repo->objects->odb->disable_ref_updates = o->disable_ref_updates;
  91
  92         free(repo->objects->alternate_db);
  93         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  94         expand_base_dir(&repo->graft_file, o->graft_file,
  95                         repo->commondir, "info/grafts");
  96         expand_base_dir(&repo->index_file, o->index_file,
  97                         repo->gitdir, "index");
  98 }
  99
 100 void repo_set_hash_algo(struct repository *repo, int hash_algo)
 101 {
 102         repo->hash_algo = &hash_algos[hash_algo];
 103 }
 104
 105 /*
 106  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 107  * Return 0 upon success and a non-zero value upon failure.
 108  */
 109 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 110 {
 111         int ret = 0;
 112         int error = 0;
 113         char *abspath = NULL;
 114         const char *resolved_gitdir;
 115         struct set_gitdir_args args = { NULL };
 116
 117         abspath = real_pathdup(gitdir, 0);
 118         if (!abspath) {
 119                 ret = -1;
 120                 goto out;
 121         }
 122
 123         /* 'gitdir' must reference the gitdir directly */
 124         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 125         if (!resolved_gitdir) {
 126                 ret = -1;
 127                 goto out;
 128         }
 129
 130         repo_set_gitdir(repo, resolved_gitdir, &args);
 131
 132 out:
 133         free(abspath);
 134         return ret;
 135 }
 136
 137 void repo_set_worktree(struct repository *repo, const char *path)
 138 {
 139         repo->worktree = real_pathdup(path, 1);
 140
 141         trace2_def_repo(repo);
 142 }
 143
 144 static int read_and_verify_repository_format(struct repository_format *format,
 145                                              const char *commondir)
 146 {
 147         int ret = 0;
 148         struct strbuf sb = STRBUF_INIT;
 149
 150         strbuf_addf(&sb, "%s/config", commondir);
 151         read_repository_format(format, sb.buf);
 152         strbuf_reset(&sb);
 153
 154         if (verify_repository_format(format, &sb) < 0) {
 155                 warning("%s", sb.buf);
 156                 ret = -1;
 157         }
 158
 159         strbuf_release(&sb);
 160         return ret;
 161 }
 162
 163 /*
 164  * Initialize 'repo' based on the provided 'gitdir'.
 165  * Return 0 upon success and a non-zero value upon failure.
 166  */
 167 int repo_init(struct repository *repo,
 168               const char *gitdir,
 169               const char *worktree)
 170 {
 171         struct repository_format format = REPOSITORY_FORMAT_INIT;
 172         memset(repo, 0, sizeof(*repo));
 173
 174         repo->objects = raw_object_store_new();
 175         repo->parsed_objects = parsed_object_pool_new();
 176         repo->remote_state = remote_state_new();
 177
 178         if (repo_init_gitdir(repo, gitdir))
 179                 goto error;
 180
 181         if (read_and_verify_repository_format(&format, repo->commondir))
 182                 goto error;
 183
 184         repo_set_hash_algo(repo, format.hash_algo);
 185
 186         /* take ownership of format.partial_clone */
 187         repo->repository_format_partial_clone = format.partial_clone;
 188         format.partial_clone = NULL;
 189
 190         if (worktree)
 191                 repo_set_worktree(repo, worktree);
 192
 193         clear_repository_format(&format);
 194         return 0;
 195
 196 error:
 197         repo_clear(repo);
 198         return -1;
 199 }
 200
 201 int repo_submodule_init(struct repository *subrepo,
 202                         struct repository *superproject,
 203                         const char *path,
 204                         const struct object_id *treeish_name)
 205 {
 206         struct strbuf gitdir = STRBUF_INIT;
 207         struct strbuf worktree = STRBUF_INIT;
 208         int ret = 0;
 209
 210         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 211         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 212
 213         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
 214                 /*
 215                  * If initialization fails then it may be due to the submodule
 216                  * not being populated in the superproject's worktree.  Instead
 217                  * we can try to initialize the submodule by finding it's gitdir
 218                  * in the superproject's 'modules' directory.  In this case the
 219                  * submodule would not have a worktree.
 220                  */
 221                 const struct submodule *sub =
 222                         submodule_from_path(superproject, treeish_name, path);
 223                 if (!sub) {
 224                         ret = -1;
 225                         goto out;
 226                 }
 227
 228                 strbuf_reset(&gitdir);
 229                 submodule_name_to_gitdir(&gitdir, superproject, sub->name);
 230
 231                 if (repo_init(subrepo, gitdir.buf, NULL)) {
 232                         ret = -1;
 233                         goto out;
 234                 }
 235         }
 236
 237         subrepo->submodule_prefix = xstrfmt("%s%s/",
 238                                             superproject->submodule_prefix ?
 239                                             superproject->submodule_prefix :
 240                                             "", path);
 241
 242 out:
 243         strbuf_release(&gitdir);
 244         strbuf_release(&worktree);
 245         return ret;
 246 }
 247
 248 static void repo_clear_path_cache(struct repo_path_cache *cache)
 249 {
 250         FREE_AND_NULL(cache->squash_msg);
 251         FREE_AND_NULL(cache->squash_msg);
 252         FREE_AND_NULL(cache->merge_msg);
 253         FREE_AND_NULL(cache->merge_rr);
 254         FREE_AND_NULL(cache->merge_mode);
 255         FREE_AND_NULL(cache->merge_head);
 256         FREE_AND_NULL(cache->merge_autostash);
 257         FREE_AND_NULL(cache->auto_merge);
 258         FREE_AND_NULL(cache->fetch_head);
 259         FREE_AND_NULL(cache->shallow);
 260 }
 261
 262 void repo_clear(struct repository *repo)
 263 {
 264         FREE_AND_NULL(repo->gitdir);
 265         FREE_AND_NULL(repo->commondir);
 266         FREE_AND_NULL(repo->graft_file);
 267         FREE_AND_NULL(repo->index_file);
 268         FREE_AND_NULL(repo->worktree);
 269         FREE_AND_NULL(repo->submodule_prefix);
 270
 271         raw_object_store_clear(repo->objects);
 272         FREE_AND_NULL(repo->objects);
 273
 274         parsed_object_pool_clear(repo->parsed_objects);
 275         FREE_AND_NULL(repo->parsed_objects);
 276
 277         if (repo->config) {
 278                 git_configset_clear(repo->config);
 279                 FREE_AND_NULL(repo->config);
 280         }
 281
 282         if (repo->submodule_cache) {
 283                 submodule_cache_free(repo->submodule_cache);
 284                 repo->submodule_cache = NULL;
 285         }
 286
 287         if (repo->index) {
 288                 discard_index(repo->index);
 289                 if (repo->index != &the_index)
 290                         FREE_AND_NULL(repo->index);
 291         }
 292
 293         if (repo->promisor_remote_config) {
 294                 promisor_remote_clear(repo->promisor_remote_config);
 295                 FREE_AND_NULL(repo->promisor_remote_config);
 296         }
 297
 298         if (repo->remote_state) {
 299                 remote_state_clear(repo->remote_state);
 300                 FREE_AND_NULL(repo->remote_state);
 301         }
 302
 303         repo_clear_path_cache(&repo->cached_paths);
 304 }
 305
 306 int repo_read_index(struct repository *repo)
 307 {
 308         int res;
 309
 310         /* Complete the double-reference */
 311         if (!repo->index) {
 312                 ALLOC_ARRAY(repo->index, 1);
 313                 index_state_init(repo->index, repo);
 314         } else if (repo->index->repo != repo) {
 315                 BUG("repo's index should point back at itself");
 316         }
 317
 318         res = read_index_from(repo->index, repo->index_file, repo->gitdir);
 319
 320         prepare_repo_settings(repo);
 321         if (repo->settings.command_requires_full_index)
 322                 ensure_full_index(repo->index);
 323
 324         /*
 325          * If sparse checkouts are in use, check whether paths with the
 326          * SKIP_WORKTREE attribute are missing from the worktree; if not,
 327          * clear that attribute for that path.
 328          */
 329         clear_skip_worktree_from_present_files(repo->index);
 330
 331         return res;
 332 }
 333
 334 int repo_hold_locked_index(struct repository *repo,
 335                            struct lock_file *lf,
 336                            int flags)
 337 {
 338         if (!repo->index_file)
 339                 BUG("the repo hasn't been setup");
 340         return hold_lock_file_for_update(lf, repo->index_file, flags);
 341 }