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         free(repo->objects->alternate_db);
  84         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  85         expand_base_dir(&repo->graft_file, o->graft_file,
  86                         repo->commondir, "info/grafts");
  87         expand_base_dir(&repo->index_file, o->index_file,
  88                         repo->gitdir, "index");
  89 }
  90
  91 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  92 {
  93         repo->hash_algo = &hash_algos[hash_algo];
  94 }
  95
  96 /*
  97  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  98  * Return 0 upon success and a non-zero value upon failure.
  99  */
 100 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 101 {
 102         int ret = 0;
 103         int error = 0;
 104         char *abspath = NULL;
 105         const char *resolved_gitdir;
 106         struct set_gitdir_args args = { NULL };
 107
 108         abspath = real_pathdup(gitdir, 0);
 109         if (!abspath) {
 110                 ret = -1;
 111                 goto out;
 112         }
 113
 114         /* 'gitdir' must reference the gitdir directly */
 115         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 116         if (!resolved_gitdir) {
 117                 ret = -1;
 118                 goto out;
 119         }
 120
 121         repo_set_gitdir(repo, resolved_gitdir, &args);
 122
 123 out:
 124         free(abspath);
 125         return ret;
 126 }
 127
 128 void repo_set_worktree(struct repository *repo, const char *path)
 129 {
 130         repo->worktree = real_pathdup(path, 1);
 131
 132         trace2_def_repo(repo);
 133 }
 134
 135 static int read_and_verify_repository_format(struct repository_format *format,
 136                                              const char *commondir)
 137 {
 138         int ret = 0;
 139         struct strbuf sb = STRBUF_INIT;
 140
 141         strbuf_addf(&sb, "%s/config", commondir);
 142         read_repository_format(format, sb.buf);
 143         strbuf_reset(&sb);
 144
 145         if (verify_repository_format(format, &sb) < 0) {
 146                 warning("%s", sb.buf);
 147                 ret = -1;
 148         }
 149
 150         strbuf_release(&sb);
 151         return ret;
 152 }
 153
 154 /*
 155  * Initialize 'repo' based on the provided 'gitdir'.
 156  * Return 0 upon success and a non-zero value upon failure.
 157  */
 158 int repo_init(struct repository *repo,
 159               const char *gitdir,
 160               const char *worktree)
 161 {
 162         struct repository_format format = REPOSITORY_FORMAT_INIT;
 163         memset(repo, 0, sizeof(*repo));
 164
 165         repo->objects = raw_object_store_new();
 166         repo->parsed_objects = parsed_object_pool_new();
 167
 168         if (repo_init_gitdir(repo, gitdir))
 169                 goto error;
 170
 171         if (read_and_verify_repository_format(&format, repo->commondir))
 172                 goto error;
 173
 174         repo_set_hash_algo(repo, format.hash_algo);
 175
 176         /* take ownership of format.partial_clone */
 177         repo->repository_format_partial_clone = format.partial_clone;
 178         format.partial_clone = NULL;
 179
 180         if (worktree)
 181                 repo_set_worktree(repo, worktree);
 182
 183         clear_repository_format(&format);
 184         return 0;
 185
 186 error:
 187         repo_clear(repo);
 188         return -1;
 189 }
 190
 191 int repo_submodule_init(struct repository *subrepo,
 192                         struct repository *superproject,
 193                         const struct submodule *sub)
 194 {
 195         struct strbuf gitdir = STRBUF_INIT;
 196         struct strbuf worktree = STRBUF_INIT;
 197         int ret = 0;
 198
 199         if (!sub) {
 200                 ret = -1;
 201                 goto out;
 202         }
 203
 204         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", sub->path);
 205         strbuf_repo_worktree_path(&worktree, superproject, "%s", sub->path);
 206
 207         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
 208                 /*
 209                  * If initialization fails then it may be due to the submodule
 210                  * not being populated in the superproject's worktree.  Instead
 211                  * we can try to initialize the submodule by finding it's gitdir
 212                  * in the superproject's 'modules' directory.  In this case the
 213                  * submodule would not have a worktree.
 214                  */
 215                 strbuf_reset(&gitdir);
 216                 strbuf_repo_git_path(&gitdir, superproject,
 217                                      "modules/%s", sub->name);
 218
 219                 if (repo_init(subrepo, gitdir.buf, NULL)) {
 220                         ret = -1;
 221                         goto out;
 222                 }
 223         }
 224
 225         subrepo->submodule_prefix = xstrfmt("%s%s/",
 226                                             superproject->submodule_prefix ?
 227                                             superproject->submodule_prefix :
 228                                             "", sub->path);
 229
 230 out:
 231         strbuf_release(&gitdir);
 232         strbuf_release(&worktree);
 233         return ret;
 234 }
 235
 236 void repo_clear(struct repository *repo)
 237 {
 238         FREE_AND_NULL(repo->gitdir);
 239         FREE_AND_NULL(repo->commondir);
 240         FREE_AND_NULL(repo->graft_file);
 241         FREE_AND_NULL(repo->index_file);
 242         FREE_AND_NULL(repo->worktree);
 243         FREE_AND_NULL(repo->submodule_prefix);
 244
 245         raw_object_store_clear(repo->objects);
 246         FREE_AND_NULL(repo->objects);
 247
 248         parsed_object_pool_clear(repo->parsed_objects);
 249         FREE_AND_NULL(repo->parsed_objects);
 250
 251         if (repo->config) {
 252                 git_configset_clear(repo->config);
 253                 FREE_AND_NULL(repo->config);
 254         }
 255
 256         if (repo->submodule_cache) {
 257                 submodule_cache_free(repo->submodule_cache);
 258                 repo->submodule_cache = NULL;
 259         }
 260
 261         if (repo->index) {
 262                 discard_index(repo->index);
 263                 if (repo->index != &the_index)
 264                         FREE_AND_NULL(repo->index);
 265         }
 266
 267         if (repo->promisor_remote_config) {
 268                 promisor_remote_clear(repo->promisor_remote_config);
 269                 FREE_AND_NULL(repo->promisor_remote_config);
 270         }
 271 }
 272
 273 int repo_read_index(struct repository *repo)
 274 {
 275         int res;
 276
 277         if (!repo->index)
 278                 CALLOC_ARRAY(repo->index, 1);
 279
 280         /* Complete the double-reference */
 281         if (!repo->index->repo)
 282                 repo->index->repo = repo;
 283         else if (repo->index->repo != repo)
 284                 BUG("repo's index should point back at itself");
 285
 286         res = read_index_from(repo->index, repo->index_file, repo->gitdir);
 287
 288         prepare_repo_settings(repo);
 289         if (repo->settings.command_requires_full_index)
 290                 ensure_full_index(repo->index);
 291
 292         return res;
 293 }
 294
 295 int repo_hold_locked_index(struct repository *repo,
 296                            struct lock_file *lf,
 297                            int flags)
 298 {
 299         if (!repo->index_file)
 300                 BUG("the repo hasn't been setup");
 301         return hold_lock_file_for_update(lf, repo->index_file, flags);
 302 }