repository.c

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "object-store.h"
   4 #include "config.h"
   5 #include "object.h"
   6 #include "submodule-config.h"
   7
   8 /* The main repository */
   9 static struct repository the_repo;
  10 struct repository *the_repository;
  11
  12 void initialize_the_repository(void)
  13 {
  14         the_repository = &the_repo;
  15
  16         the_repo.index = &the_index;
  17         the_repo.objects = raw_object_store_new();
  18         the_repo.parsed_objects = parsed_object_pool_new();
  19
  20         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  21 }
  22
  23 static void expand_base_dir(char **out, const char *in,
  24                             const char *base_dir, const char *def_in)
  25 {
  26         free(*out);
  27         if (in)
  28                 *out = xstrdup(in);
  29         else
  30                 *out = xstrfmt("%s/%s", base_dir, def_in);
  31 }
  32
  33 static void repo_set_commondir(struct repository *repo,
  34                                const char *commondir)
  35 {
  36         struct strbuf sb = STRBUF_INIT;
  37
  38         free(repo->commondir);
  39
  40         if (commondir) {
  41                 repo->different_commondir = 1;
  42                 repo->commondir = xstrdup(commondir);
  43                 return;
  44         }
  45
  46         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  47         repo->commondir = strbuf_detach(&sb, NULL);
  48 }
  49
  50 void repo_set_gitdir(struct repository *repo,
  51                      const char *root,
  52                      const struct set_gitdir_args *o)
  53 {
  54         const char *gitfile = read_gitfile(root);
  55         /*
  56          * repo->gitdir is saved because the caller could pass "root"
  57          * that also points to repo->gitdir. We want to keep it alive
  58          * until after xstrdup(root). Then we can free it.
  59          */
  60         char *old_gitdir = repo->gitdir;
  61
  62         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  63         free(old_gitdir);
  64
  65         repo_set_commondir(repo, o->commondir);
  66         expand_base_dir(&repo->objects->objectdir, o->object_dir,
  67                         repo->commondir, "objects");
  68         free(repo->objects->alternate_db);
  69         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  70         expand_base_dir(&repo->graft_file, o->graft_file,
  71                         repo->commondir, "info/grafts");
  72         expand_base_dir(&repo->index_file, o->index_file,
  73                         repo->gitdir, "index");
  74 }
  75
  76 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  77 {
  78         repo->hash_algo = &hash_algos[hash_algo];
  79 }
  80
  81 /*
  82  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  83  * Return 0 upon success and a non-zero value upon failure.
  84  */
  85 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
  86 {
  87         int ret = 0;
  88         int error = 0;
  89         char *abspath = NULL;
  90         const char *resolved_gitdir;
  91         struct set_gitdir_args args = { NULL };
  92
  93         abspath = real_pathdup(gitdir, 0);
  94         if (!abspath) {
  95                 ret = -1;
  96                 goto out;
  97         }
  98
  99         /* 'gitdir' must reference the gitdir directly */
 100         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 101         if (!resolved_gitdir) {
 102                 ret = -1;
 103                 goto out;
 104         }
 105
 106         repo_set_gitdir(repo, resolved_gitdir, &args);
 107
 108 out:
 109         free(abspath);
 110         return ret;
 111 }
 112
 113 void repo_set_worktree(struct repository *repo, const char *path)
 114 {
 115         repo->worktree = real_pathdup(path, 1);
 116 }
 117
 118 static int read_and_verify_repository_format(struct repository_format *format,
 119                                              const char *commondir)
 120 {
 121         int ret = 0;
 122         struct strbuf sb = STRBUF_INIT;
 123
 124         strbuf_addf(&sb, "%s/config", commondir);
 125         read_repository_format(format, sb.buf);
 126         strbuf_reset(&sb);
 127
 128         if (verify_repository_format(format, &sb) < 0) {
 129                 warning("%s", sb.buf);
 130                 ret = -1;
 131         }
 132
 133         strbuf_release(&sb);
 134         return ret;
 135 }
 136
 137 /*
 138  * Initialize 'repo' based on the provided 'gitdir'.
 139  * Return 0 upon success and a non-zero value upon failure.
 140  */
 141 int repo_init(struct repository *repo,
 142               const char *gitdir,
 143               const char *worktree)
 144 {
 145         struct repository_format format;
 146         memset(repo, 0, sizeof(*repo));
 147
 148         repo->objects = raw_object_store_new();
 149         repo->parsed_objects = parsed_object_pool_new();
 150
 151         if (repo_init_gitdir(repo, gitdir))
 152                 goto error;
 153
 154         if (read_and_verify_repository_format(&format, repo->commondir))
 155                 goto error;
 156
 157         repo_set_hash_algo(repo, format.hash_algo);
 158
 159         if (worktree)
 160                 repo_set_worktree(repo, worktree);
 161
 162         return 0;
 163
 164 error:
 165         repo_clear(repo);
 166         return -1;
 167 }
 168
 169 /*
 170  * Initialize 'submodule' as the submodule given by 'path' in parent repository
 171  * 'superproject'.
 172  * Return 0 upon success and a non-zero value upon failure.
 173  */
 174 int repo_submodule_init(struct repository *submodule,
 175                         struct repository *superproject,
 176                         const char *path)
 177 {
 178         const struct submodule *sub;
 179         struct strbuf gitdir = STRBUF_INIT;
 180         struct strbuf worktree = STRBUF_INIT;
 181         int ret = 0;
 182
 183         sub = submodule_from_path(superproject, &null_oid, path);
 184         if (!sub) {
 185                 ret = -1;
 186                 goto out;
 187         }
 188
 189         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 190         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 191
 192         if (repo_init(submodule, gitdir.buf, worktree.buf)) {
 193                 /*
 194                  * If initilization fails then it may be due to the submodule
 195                  * not being populated in the superproject's worktree.  Instead
 196                  * we can try to initilize the submodule by finding it's gitdir
 197                  * in the superproject's 'modules' directory.  In this case the
 198                  * submodule would not have a worktree.
 199                  */
 200                 strbuf_reset(&gitdir);
 201                 strbuf_repo_git_path(&gitdir, superproject,
 202                                      "modules/%s", sub->name);
 203
 204                 if (repo_init(submodule, gitdir.buf, NULL)) {
 205                         ret = -1;
 206                         goto out;
 207                 }
 208         }
 209
 210         submodule->submodule_prefix = xstrfmt("%s%s/",
 211                                               superproject->submodule_prefix ?
 212                                               superproject->submodule_prefix :
 213                                               "", path);
 214
 215 out:
 216         strbuf_release(&gitdir);
 217         strbuf_release(&worktree);
 218         return ret;
 219 }
 220
 221 void repo_clear(struct repository *repo)
 222 {
 223         FREE_AND_NULL(repo->gitdir);
 224         FREE_AND_NULL(repo->commondir);
 225         FREE_AND_NULL(repo->graft_file);
 226         FREE_AND_NULL(repo->index_file);
 227         FREE_AND_NULL(repo->worktree);
 228         FREE_AND_NULL(repo->submodule_prefix);
 229
 230         raw_object_store_clear(repo->objects);
 231         FREE_AND_NULL(repo->objects);
 232
 233         parsed_object_pool_clear(repo->parsed_objects);
 234         FREE_AND_NULL(repo->parsed_objects);
 235
 236         if (repo->config) {
 237                 git_configset_clear(repo->config);
 238                 FREE_AND_NULL(repo->config);
 239         }
 240
 241         if (repo->submodule_cache) {
 242                 submodule_cache_free(repo->submodule_cache);
 243                 repo->submodule_cache = NULL;
 244         }
 245
 246         if (repo->index) {
 247                 discard_index(repo->index);
 248                 if (repo->index != &the_index)
 249                         FREE_AND_NULL(repo->index);
 250         }
 251 }
 252
 253 int repo_read_index(struct repository *repo)
 254 {
 255         if (!repo->index)
 256                 repo->index = xcalloc(1, sizeof(*repo->index));
 257
 258         return read_index_from(repo->index, repo->index_file, repo->gitdir);
 259 }