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