repository.c

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "object-store.h"
   4 #include "config.h"
   5 #include "submodule-config.h"
   6
   7 /* The main repository */
   8 static struct repository the_repo;
   9 struct repository *the_repository;
  10
  11 void initialize_the_repository(void)
  12 {
  13         the_repository = &the_repo;
  14
  15         the_repo.index = &the_index;
  16         the_repo.objects = raw_object_store_new();
  17         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  18 }
  19
  20 static void expand_base_dir(char **out, const char *in,
  21                             const char *base_dir, const char *def_in)
  22 {
  23         free(*out);
  24         if (in)
  25                 *out = xstrdup(in);
  26         else
  27                 *out = xstrfmt("%s/%s", base_dir, def_in);
  28 }
  29
  30 static void repo_set_commondir(struct repository *repo,
  31                                const char *commondir)
  32 {
  33         struct strbuf sb = STRBUF_INIT;
  34
  35         free(repo->commondir);
  36
  37         if (commondir) {
  38                 repo->different_commondir = 1;
  39                 repo->commondir = xstrdup(commondir);
  40                 return;
  41         }
  42
  43         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  44         repo->commondir = strbuf_detach(&sb, NULL);
  45 }
  46
  47 void repo_set_gitdir(struct repository *repo,
  48                      const char *root,
  49                      const struct set_gitdir_args *o)
  50 {
  51         const char *gitfile = read_gitfile(root);
  52         /*
  53          * repo->gitdir is saved because the caller could pass "root"
  54          * that also points to repo->gitdir. We want to keep it alive
  55          * until after xstrdup(root). Then we can free it.
  56          */
  57         char *old_gitdir = repo->gitdir;
  58
  59         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  60         free(old_gitdir);
  61
  62         repo_set_commondir(repo, o->commondir);
  63         expand_base_dir(&repo->objects->objectdir, o->object_dir,
  64                         repo->commondir, "objects");
  65         free(repo->objects->alternate_db);
  66         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  67         expand_base_dir(&repo->graft_file, o->graft_file,
  68                         repo->commondir, "info/grafts");
  69         expand_base_dir(&repo->index_file, o->index_file,
  70                         repo->gitdir, "index");
  71 }
  72
  73 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  74 {
  75         repo->hash_algo = &hash_algos[hash_algo];
  76 }
  77
  78 /*
  79  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  80  * Return 0 upon success and a non-zero value upon failure.
  81  */
  82 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
  83 {
  84         int ret = 0;
  85         int error = 0;
  86         char *abspath = NULL;
  87         const char *resolved_gitdir;
  88         struct set_gitdir_args args = { NULL };
  89
  90         abspath = real_pathdup(gitdir, 0);
  91         if (!abspath) {
  92                 ret = -1;
  93                 goto out;
  94         }
  95
  96         /* 'gitdir' must reference the gitdir directly */
  97         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
  98         if (!resolved_gitdir) {
  99                 ret = -1;
 100                 goto out;
 101         }
 102
 103         repo_set_gitdir(repo, resolved_gitdir, &args);
 104
 105 out:
 106         free(abspath);
 107         return ret;
 108 }
 109
 110 void repo_set_worktree(struct repository *repo, const char *path)
 111 {
 112         repo->worktree = real_pathdup(path, 1);
 113 }
 114
 115 static int read_and_verify_repository_format(struct repository_format *format,
 116                                              const char *commondir)
 117 {
 118         int ret = 0;
 119         struct strbuf sb = STRBUF_INIT;
 120
 121         strbuf_addf(&sb, "%s/config", commondir);
 122         read_repository_format(format, sb.buf);
 123         strbuf_reset(&sb);
 124
 125         if (verify_repository_format(format, &sb) < 0) {
 126                 warning("%s", sb.buf);
 127                 ret = -1;
 128         }
 129
 130         strbuf_release(&sb);
 131         return ret;
 132 }
 133
 134 /*
 135  * Initialize 'repo' based on the provided 'gitdir'.
 136  * Return 0 upon success and a non-zero value upon failure.
 137  */
 138 int repo_init(struct repository *repo,
 139               const char *gitdir,
 140               const char *worktree)
 141 {
 142         struct repository_format format;
 143         memset(repo, 0, sizeof(*repo));
 144
 145         repo->objects = raw_object_store_new();
 146
 147         if (repo_init_gitdir(repo, gitdir))
 148                 goto error;
 149
 150         if (read_and_verify_repository_format(&format, repo->commondir))
 151                 goto error;
 152
 153         repo_set_hash_algo(repo, format.hash_algo);
 154
 155         if (worktree)
 156                 repo_set_worktree(repo, worktree);
 157
 158         return 0;
 159
 160 error:
 161         repo_clear(repo);
 162         return -1;
 163 }
 164
 165 /*
 166  * Initialize 'submodule' as the submodule given by 'path' in parent repository
 167  * 'superproject'.
 168  * Return 0 upon success and a non-zero value upon failure.
 169  */
 170 int repo_submodule_init(struct repository *submodule,
 171                         struct repository *superproject,
 172                         const char *path)
 173 {
 174         const struct submodule *sub;
 175         struct strbuf gitdir = STRBUF_INIT;
 176         struct strbuf worktree = STRBUF_INIT;
 177         int ret = 0;
 178
 179         sub = submodule_from_path(superproject, &null_oid, path);
 180         if (!sub) {
 181                 ret = -1;
 182                 goto out;
 183         }
 184
 185         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 186         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 187
 188         if (repo_init(submodule, gitdir.buf, worktree.buf)) {
 189                 /*
 190                  * If initilization fails then it may be due to the submodule
 191                  * not being populated in the superproject's worktree.  Instead
 192                  * we can try to initilize the submodule by finding it's gitdir
 193                  * in the superproject's 'modules' directory.  In this case the
 194                  * submodule would not have a worktree.
 195                  */
 196                 strbuf_reset(&gitdir);
 197                 strbuf_repo_git_path(&gitdir, superproject,
 198                                      "modules/%s", sub->name);
 199
 200                 if (repo_init(submodule, gitdir.buf, NULL)) {
 201                         ret = -1;
 202                         goto out;
 203                 }
 204         }
 205
 206         submodule->submodule_prefix = xstrfmt("%s%s/",
 207                                               superproject->submodule_prefix ?
 208                                               superproject->submodule_prefix :
 209                                               "", path);
 210
 211 out:
 212         strbuf_release(&gitdir);
 213         strbuf_release(&worktree);
 214         return ret;
 215 }
 216
 217 void repo_clear(struct repository *repo)
 218 {
 219         FREE_AND_NULL(repo->gitdir);
 220         FREE_AND_NULL(repo->commondir);
 221         FREE_AND_NULL(repo->graft_file);
 222         FREE_AND_NULL(repo->index_file);
 223         FREE_AND_NULL(repo->worktree);
 224         FREE_AND_NULL(repo->submodule_prefix);
 225
 226         raw_object_store_clear(repo->objects);
 227         FREE_AND_NULL(repo->objects);
 228
 229         if (repo->config) {
 230                 git_configset_clear(repo->config);
 231                 FREE_AND_NULL(repo->config);
 232         }
 233
 234         if (repo->submodule_cache) {
 235                 submodule_cache_free(repo->submodule_cache);
 236                 repo->submodule_cache = NULL;
 237         }
 238
 239         if (repo->index) {
 240                 discard_index(repo->index);
 241                 if (repo->index != &the_index)
 242                         FREE_AND_NULL(repo->index);
 243         }
 244 }
 245
 246 int repo_read_index(struct repository *repo)
 247 {
 248         if (!repo->index)
 249                 repo->index = xcalloc(1, sizeof(*repo->index));
 250
 251         return read_index_from(repo->index, repo->index_file, repo->gitdir);
 252 }