repository.c

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "config.h"
   4 #include "submodule-config.h"
   5
   6 /* The main repository */
   7 static struct repository the_repo;
   8 struct repository *the_repository;
   9
  10 void initialize_the_repository(void)
  11 {
  12         the_repository = &the_repo;
  13
  14         the_repo.index = &the_index;
  15         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  16 }
  17
  18 static char *git_path_from_env(const char *envvar, const char *git_dir,
  19                                const char *path, int fromenv)
  20 {
  21         if (fromenv) {
  22                 const char *value = getenv(envvar);
  23                 if (value)
  24                         return xstrdup(value);
  25         }
  26
  27         return xstrfmt("%s/%s", git_dir, path);
  28 }
  29
  30 static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv)
  31 {
  32         if (fromenv) {
  33                 const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT);
  34                 if (value) {
  35                         strbuf_addstr(sb, value);
  36                         return 1;
  37                 }
  38         }
  39
  40         return get_common_dir_noenv(sb, gitdir);
  41 }
  42
  43 static void expand_base_dir(char **out, const char *in,
  44                             const char *base_dir, const char *def_in)
  45 {
  46         free(*out);
  47         if (in)
  48                 *out = xstrdup(in);
  49         else
  50                 *out = xstrfmt("%s/%s", base_dir, def_in);
  51 }
  52
  53 static void repo_set_commondir(struct repository *repo,
  54                                const char *commondir)
  55 {
  56         struct strbuf sb = STRBUF_INIT;
  57
  58         free(repo->commondir);
  59
  60         if (commondir) {
  61                 repo->different_commondir = 1;
  62                 repo->commondir = xstrdup(commondir);
  63                 return;
  64         }
  65
  66         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  67         repo->commondir = strbuf_detach(&sb, NULL);
  68 }
  69
  70 void repo_set_gitdir(struct repository *repo,
  71                      const char *root,
  72                      const struct set_gitdir_args *o)
  73 {
  74         const char *gitfile = read_gitfile(root);
  75         /*
  76          * repo->gitdir is saved because the caller could pass "root"
  77          * that also points to repo->gitdir. We want to keep it alive
  78          * until after xstrdup(root). Then we can free it.
  79          */
  80         char *old_gitdir = repo->gitdir;
  81
  82         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  83         free(old_gitdir);
  84
  85         repo_set_commondir(repo, o->commondir);
  86         expand_base_dir(&repo->objectdir, o->object_dir,
  87                         repo->commondir, "objects");
  88         expand_base_dir(&repo->graft_file, o->graft_file,
  89                         repo->commondir, "info/grafts");
  90         expand_base_dir(&repo->index_file, o->index_file,
  91                         repo->gitdir, "index");
  92 }
  93
  94 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  95 {
  96         repo->hash_algo = &hash_algos[hash_algo];
  97 }
  98
  99 /*
 100  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 101  * Return 0 upon success and a non-zero value upon failure.
 102  */
 103 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 104 {
 105         int ret = 0;
 106         int error = 0;
 107         char *abspath = NULL;
 108         const char *resolved_gitdir;
 109         struct set_gitdir_args args = { NULL };
 110
 111         abspath = real_pathdup(gitdir, 0);
 112         if (!abspath) {
 113                 ret = -1;
 114                 goto out;
 115         }
 116
 117         /* 'gitdir' must reference the gitdir directly */
 118         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 119         if (!resolved_gitdir) {
 120                 ret = -1;
 121                 goto out;
 122         }
 123
 124         repo_set_gitdir(repo, resolved_gitdir, &args);
 125
 126 out:
 127         free(abspath);
 128         return ret;
 129 }
 130
 131 void repo_set_worktree(struct repository *repo, const char *path)
 132 {
 133         repo->worktree = real_pathdup(path, 1);
 134 }
 135
 136 static int read_and_verify_repository_format(struct repository_format *format,
 137                                              const char *commondir)
 138 {
 139         int ret = 0;
 140         struct strbuf sb = STRBUF_INIT;
 141
 142         strbuf_addf(&sb, "%s/config", commondir);
 143         read_repository_format(format, sb.buf);
 144         strbuf_reset(&sb);
 145
 146         if (verify_repository_format(format, &sb) < 0) {
 147                 warning("%s", sb.buf);
 148                 ret = -1;
 149         }
 150
 151         strbuf_release(&sb);
 152         return ret;
 153 }
 154
 155 /*
 156  * Initialize 'repo' based on the provided 'gitdir'.
 157  * Return 0 upon success and a non-zero value upon failure.
 158  */
 159 static int repo_init(struct repository *repo,
 160                      const char *gitdir,
 161                      const char *worktree)
 162 {
 163         struct repository_format format;
 164         memset(repo, 0, sizeof(*repo));
 165
 166         repo->ignore_env = 1;
 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         if (worktree)
 177                 repo_set_worktree(repo, worktree);
 178
 179         return 0;
 180
 181 error:
 182         repo_clear(repo);
 183         return -1;
 184 }
 185
 186 /*
 187  * Initialize 'submodule' as the submodule given by 'path' in parent repository
 188  * 'superproject'.
 189  * Return 0 upon success and a non-zero value upon failure.
 190  */
 191 int repo_submodule_init(struct repository *submodule,
 192                         struct repository *superproject,
 193                         const char *path)
 194 {
 195         const struct submodule *sub;
 196         struct strbuf gitdir = STRBUF_INIT;
 197         struct strbuf worktree = STRBUF_INIT;
 198         int ret = 0;
 199
 200         sub = submodule_from_cache(superproject, &null_oid, path);
 201         if (!sub) {
 202                 ret = -1;
 203                 goto out;
 204         }
 205
 206         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 207         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 208
 209         if (repo_init(submodule, gitdir.buf, worktree.buf)) {
 210                 /*
 211                  * If initilization fails then it may be due to the submodule
 212                  * not being populated in the superproject's worktree.  Instead
 213                  * we can try to initilize the submodule by finding it's gitdir
 214                  * in the superproject's 'modules' directory.  In this case the
 215                  * submodule would not have a worktree.
 216                  */
 217                 strbuf_reset(&gitdir);
 218                 strbuf_repo_git_path(&gitdir, superproject,
 219                                      "modules/%s", sub->name);
 220
 221                 if (repo_init(submodule, gitdir.buf, NULL)) {
 222                         ret = -1;
 223                         goto out;
 224                 }
 225         }
 226
 227         submodule->submodule_prefix = xstrfmt("%s%s/",
 228                                               superproject->submodule_prefix ?
 229                                               superproject->submodule_prefix :
 230                                               "", path);
 231
 232 out:
 233         strbuf_release(&gitdir);
 234         strbuf_release(&worktree);
 235         return ret;
 236 }
 237
 238 void repo_clear(struct repository *repo)
 239 {
 240         FREE_AND_NULL(repo->gitdir);
 241         FREE_AND_NULL(repo->commondir);
 242         FREE_AND_NULL(repo->objectdir);
 243         FREE_AND_NULL(repo->graft_file);
 244         FREE_AND_NULL(repo->index_file);
 245         FREE_AND_NULL(repo->worktree);
 246         FREE_AND_NULL(repo->submodule_prefix);
 247
 248         if (repo->config) {
 249                 git_configset_clear(repo->config);
 250                 FREE_AND_NULL(repo->config);
 251         }
 252
 253         if (repo->submodule_cache) {
 254                 submodule_cache_free(repo->submodule_cache);
 255                 repo->submodule_cache = NULL;
 256         }
 257
 258         if (repo->index) {
 259                 discard_index(repo->index);
 260                 FREE_AND_NULL(repo->index);
 261         }
 262 }
 263
 264 int repo_read_index(struct repository *repo)
 265 {
 266         if (!repo->index)
 267                 repo->index = xcalloc(1, sizeof(*repo->index));
 268
 269         return read_index_from(repo->index, repo->index_file, repo->gitdir);
 270 }