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 "git-compat-util.h"
   7 #include "abspath.h"
   8 #include "repository.h"
   9 #include "object-store-ll.h"
  10 #include "config.h"
  11 #include "object.h"
  12 #include "lockfile.h"
  13 #include "path.h"
  14 #include "read-cache-ll.h"
  15 #include "remote.h"
  16 #include "setup.h"
  17 #include "submodule-config.h"
  18 #include "sparse-index.h"
  19 #include "trace2.h"
  20 #include "promisor-remote.h"
  21
  22 /* The main repository */
  23 static struct repository the_repo;
  24 struct repository *the_repository;
  25 struct index_state the_index;
  26
  27 void initialize_the_repository(void)
  28 {
  29         the_repository = &the_repo;
  30
  31         the_repo.index = &the_index;
  32         the_repo.objects = raw_object_store_new();
  33         the_repo.remote_state = remote_state_new();
  34         the_repo.parsed_objects = parsed_object_pool_new();
  35
  36         index_state_init(&the_index, the_repository);
  37
  38         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  39 }
  40
  41 static void expand_base_dir(char **out, const char *in,
  42                             const char *base_dir, const char *def_in)
  43 {
  44         free(*out);
  45         if (in)
  46                 *out = xstrdup(in);
  47         else
  48                 *out = xstrfmt("%s/%s", base_dir, def_in);
  49 }
  50
  51 static void repo_set_commondir(struct repository *repo,
  52                                const char *commondir)
  53 {
  54         struct strbuf sb = STRBUF_INIT;
  55
  56         free(repo->commondir);
  57
  58         if (commondir) {
  59                 repo->different_commondir = 1;
  60                 repo->commondir = xstrdup(commondir);
  61                 return;
  62         }
  63
  64         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  65         repo->commondir = strbuf_detach(&sb, NULL);
  66 }
  67
  68 void repo_set_gitdir(struct repository *repo,
  69                      const char *root,
  70                      const struct set_gitdir_args *o)
  71 {
  72         const char *gitfile = read_gitfile(root);
  73         /*
  74          * repo->gitdir is saved because the caller could pass "root"
  75          * that also points to repo->gitdir. We want to keep it alive
  76          * until after xstrdup(root). Then we can free it.
  77          */
  78         char *old_gitdir = repo->gitdir;
  79
  80         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  81         free(old_gitdir);
  82
  83         repo_set_commondir(repo, o->commondir);
  84
  85         if (!repo->objects->odb) {
  86                 CALLOC_ARRAY(repo->objects->odb, 1);
  87                 repo->objects->odb_tail = &repo->objects->odb->next;
  88         }
  89         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  90                         repo->commondir, "objects");
  91
  92         repo->objects->odb->disable_ref_updates = o->disable_ref_updates;
  93
  94         free(repo->objects->alternate_db);
  95         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  96         expand_base_dir(&repo->graft_file, o->graft_file,
  97                         repo->commondir, "info/grafts");
  98         expand_base_dir(&repo->index_file, o->index_file,
  99                         repo->gitdir, "index");
 100 }
 101
 102 void repo_set_hash_algo(struct repository *repo, int hash_algo)
 103 {
 104         repo->hash_algo = &hash_algos[hash_algo];
 105 }
 106
 107 /*
 108  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 109  * Return 0 upon success and a non-zero value upon failure.
 110  */
 111 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 112 {
 113         int ret = 0;
 114         int error = 0;
 115         char *abspath = NULL;
 116         const char *resolved_gitdir;
 117         struct set_gitdir_args args = { NULL };
 118
 119         abspath = real_pathdup(gitdir, 0);
 120         if (!abspath) {
 121                 ret = -1;
 122                 goto out;
 123         }
 124
 125         /* 'gitdir' must reference the gitdir directly */
 126         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 127         if (!resolved_gitdir) {
 128                 ret = -1;
 129                 goto out;
 130         }
 131
 132         repo_set_gitdir(repo, resolved_gitdir, &args);
 133
 134 out:
 135         free(abspath);
 136         return ret;
 137 }
 138
 139 void repo_set_worktree(struct repository *repo, const char *path)
 140 {
 141         repo->worktree = real_pathdup(path, 1);
 142
 143         trace2_def_repo(repo);
 144 }
 145
 146 static int read_and_verify_repository_format(struct repository_format *format,
 147                                              const char *commondir)
 148 {
 149         int ret = 0;
 150         struct strbuf sb = STRBUF_INIT;
 151
 152         strbuf_addf(&sb, "%s/config", commondir);
 153         read_repository_format(format, sb.buf);
 154         strbuf_reset(&sb);
 155
 156         if (verify_repository_format(format, &sb) < 0) {
 157                 warning("%s", sb.buf);
 158                 ret = -1;
 159         }
 160
 161         strbuf_release(&sb);
 162         return ret;
 163 }
 164
 165 /*
 166  * Initialize 'repo' based on the provided 'gitdir'.
 167  * Return 0 upon success and a non-zero value upon failure.
 168  */
 169 int repo_init(struct repository *repo,
 170               const char *gitdir,
 171               const char *worktree)
 172 {
 173         struct repository_format format = REPOSITORY_FORMAT_INIT;
 174         memset(repo, 0, sizeof(*repo));
 175
 176         repo->objects = raw_object_store_new();
 177         repo->parsed_objects = parsed_object_pool_new();
 178         repo->remote_state = remote_state_new();
 179
 180         if (repo_init_gitdir(repo, gitdir))
 181                 goto error;
 182
 183         if (read_and_verify_repository_format(&format, repo->commondir))
 184                 goto error;
 185
 186         repo_set_hash_algo(repo, format.hash_algo);
 187         repo->repository_format_worktree_config = format.worktree_config;
 188
 189         /* take ownership of format.partial_clone */
 190         repo->repository_format_partial_clone = format.partial_clone;
 191         format.partial_clone = NULL;
 192
 193         if (worktree)
 194                 repo_set_worktree(repo, worktree);
 195
 196         clear_repository_format(&format);
 197         return 0;
 198
 199 error:
 200         repo_clear(repo);
 201         return -1;
 202 }
 203
 204 int repo_submodule_init(struct repository *subrepo,
 205                         struct repository *superproject,
 206                         const char *path,
 207                         const struct object_id *treeish_name)
 208 {
 209         struct strbuf gitdir = STRBUF_INIT;
 210         struct strbuf worktree = STRBUF_INIT;
 211         int ret = 0;
 212
 213         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 214         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 215
 216         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
 217                 /*
 218                  * If initialization fails then it may be due to the submodule
 219                  * not being populated in the superproject's worktree.  Instead
 220                  * we can try to initialize the submodule by finding it's gitdir
 221                  * in the superproject's 'modules' directory.  In this case the
 222                  * submodule would not have a worktree.
 223                  */
 224                 const struct submodule *sub =
 225                         submodule_from_path(superproject, treeish_name, path);
 226                 if (!sub) {
 227                         ret = -1;
 228                         goto out;
 229                 }
 230
 231                 strbuf_reset(&gitdir);
 232                 submodule_name_to_gitdir(&gitdir, superproject, sub->name);
 233
 234                 if (repo_init(subrepo, gitdir.buf, NULL)) {
 235                         ret = -1;
 236                         goto out;
 237                 }
 238         }
 239
 240         subrepo->submodule_prefix = xstrfmt("%s%s/",
 241                                             superproject->submodule_prefix ?
 242                                             superproject->submodule_prefix :
 243                                             "", path);
 244
 245 out:
 246         strbuf_release(&gitdir);
 247         strbuf_release(&worktree);
 248         return ret;
 249 }
 250
 251 static void repo_clear_path_cache(struct repo_path_cache *cache)
 252 {
 253         FREE_AND_NULL(cache->squash_msg);
 254         FREE_AND_NULL(cache->squash_msg);
 255         FREE_AND_NULL(cache->merge_msg);
 256         FREE_AND_NULL(cache->merge_rr);
 257         FREE_AND_NULL(cache->merge_mode);
 258         FREE_AND_NULL(cache->merge_head);
 259         FREE_AND_NULL(cache->merge_autostash);
 260         FREE_AND_NULL(cache->auto_merge);
 261         FREE_AND_NULL(cache->fetch_head);
 262         FREE_AND_NULL(cache->shallow);
 263 }
 264
 265 void repo_clear(struct repository *repo)
 266 {
 267         FREE_AND_NULL(repo->gitdir);
 268         FREE_AND_NULL(repo->commondir);
 269         FREE_AND_NULL(repo->graft_file);
 270         FREE_AND_NULL(repo->index_file);
 271         FREE_AND_NULL(repo->worktree);
 272         FREE_AND_NULL(repo->submodule_prefix);
 273
 274         raw_object_store_clear(repo->objects);
 275         FREE_AND_NULL(repo->objects);
 276
 277         parsed_object_pool_clear(repo->parsed_objects);
 278         FREE_AND_NULL(repo->parsed_objects);
 279
 280         if (repo->config) {
 281                 git_configset_clear(repo->config);
 282                 FREE_AND_NULL(repo->config);
 283         }
 284
 285         if (repo->submodule_cache) {
 286                 submodule_cache_free(repo->submodule_cache);
 287                 repo->submodule_cache = NULL;
 288         }
 289
 290         if (repo->index) {
 291                 discard_index(repo->index);
 292                 if (repo->index != &the_index)
 293                         FREE_AND_NULL(repo->index);
 294         }
 295
 296         if (repo->promisor_remote_config) {
 297                 promisor_remote_clear(repo->promisor_remote_config);
 298                 FREE_AND_NULL(repo->promisor_remote_config);
 299         }
 300
 301         if (repo->remote_state) {
 302                 remote_state_clear(repo->remote_state);
 303                 FREE_AND_NULL(repo->remote_state);
 304         }
 305
 306         repo_clear_path_cache(&repo->cached_paths);
 307 }
 308
 309 int repo_read_index(struct repository *repo)
 310 {
 311         int res;
 312
 313         /* Complete the double-reference */
 314         if (!repo->index) {
 315                 ALLOC_ARRAY(repo->index, 1);
 316                 index_state_init(repo->index, repo);
 317         } else if (repo->index->repo != repo) {
 318                 BUG("repo's index should point back at itself");
 319         }
 320
 321         res = read_index_from(repo->index, repo->index_file, repo->gitdir);
 322
 323         prepare_repo_settings(repo);
 324         if (repo->settings.command_requires_full_index)
 325                 ensure_full_index(repo->index);
 326
 327         /*
 328          * If sparse checkouts are in use, check whether paths with the
 329          * SKIP_WORKTREE attribute are missing from the worktree; if not,
 330          * clear that attribute for that path.
 331          */
 332         clear_skip_worktree_from_present_files(repo->index);
 333
 334         return res;
 335 }
 336
 337 int repo_hold_locked_index(struct repository *repo,
 338                            struct lock_file *lf,
 339                            int flags)
 340 {
 341         if (!repo->index_file)
 342                 BUG("the repo hasn't been setup");
 343         return hold_lock_file_for_update(lf, repo->index_file, flags);
 344 }