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
  67         if (!repo->objects->odb) {
  68                 repo->objects->odb = xcalloc(1, sizeof(*repo->objects->odb));
  69                 repo->objects->odb_tail = &repo->objects->odb->next;
  70         }
  71         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  72                         repo->commondir, "objects");
  73
  74         free(repo->objects->alternate_db);
  75         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  76         expand_base_dir(&repo->graft_file, o->graft_file,
  77                         repo->commondir, "info/grafts");
  78         expand_base_dir(&repo->index_file, o->index_file,
  79                         repo->gitdir, "index");
  80 }
  81
  82 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  83 {
  84         repo->hash_algo = &hash_algos[hash_algo];
  85 }
  86
  87 /*
  88  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  89  * Return 0 upon success and a non-zero value upon failure.
  90  */
  91 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
  92 {
  93         int ret = 0;
  94         int error = 0;
  95         char *abspath = NULL;
  96         const char *resolved_gitdir;
  97         struct set_gitdir_args args = { NULL };
  98
  99         abspath = real_pathdup(gitdir, 0);
 100         if (!abspath) {
 101                 ret = -1;
 102                 goto out;
 103         }
 104
 105         /* 'gitdir' must reference the gitdir directly */
 106         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 107         if (!resolved_gitdir) {
 108                 ret = -1;
 109                 goto out;
 110         }
 111
 112         repo_set_gitdir(repo, resolved_gitdir, &args);
 113
 114 out:
 115         free(abspath);
 116         return ret;
 117 }
 118
 119 void repo_set_worktree(struct repository *repo, const char *path)
 120 {
 121         repo->worktree = real_pathdup(path, 1);
 122 }
 123
 124 static int read_and_verify_repository_format(struct repository_format *format,
 125                                              const char *commondir)
 126 {
 127         int ret = 0;
 128         struct strbuf sb = STRBUF_INIT;
 129
 130         strbuf_addf(&sb, "%s/config", commondir);
 131         read_repository_format(format, sb.buf);
 132         strbuf_reset(&sb);
 133
 134         if (verify_repository_format(format, &sb) < 0) {
 135                 warning("%s", sb.buf);
 136                 ret = -1;
 137         }
 138
 139         strbuf_release(&sb);
 140         return ret;
 141 }
 142
 143 /*
 144  * Initialize 'repo' based on the provided 'gitdir'.
 145  * Return 0 upon success and a non-zero value upon failure.
 146  */
 147 int repo_init(struct repository *repo,
 148               const char *gitdir,
 149               const char *worktree)
 150 {
 151         struct repository_format format;
 152         memset(repo, 0, sizeof(*repo));
 153
 154         repo->objects = raw_object_store_new();
 155         repo->parsed_objects = parsed_object_pool_new();
 156
 157         if (repo_init_gitdir(repo, gitdir))
 158                 goto error;
 159
 160         if (read_and_verify_repository_format(&format, repo->commondir))
 161                 goto error;
 162
 163         repo_set_hash_algo(repo, format.hash_algo);
 164
 165         if (worktree)
 166                 repo_set_worktree(repo, worktree);
 167
 168         return 0;
 169
 170 error:
 171         repo_clear(repo);
 172         return -1;
 173 }
 174
 175 /*
 176  * Initialize 'submodule' as the submodule given by 'path' in parent repository
 177  * 'superproject'.
 178  * Return 0 upon success and a non-zero value upon failure.
 179  */
 180 int repo_submodule_init(struct repository *submodule,
 181                         struct repository *superproject,
 182                         const char *path)
 183 {
 184         const struct submodule *sub;
 185         struct strbuf gitdir = STRBUF_INIT;
 186         struct strbuf worktree = STRBUF_INIT;
 187         int ret = 0;
 188
 189         sub = submodule_from_path(superproject, &null_oid, path);
 190         if (!sub) {
 191                 ret = -1;
 192                 goto out;
 193         }
 194
 195         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 196         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 197
 198         if (repo_init(submodule, gitdir.buf, worktree.buf)) {
 199                 /*
 200                  * If initilization fails then it may be due to the submodule
 201                  * not being populated in the superproject's worktree.  Instead
 202                  * we can try to initilize the submodule by finding it's gitdir
 203                  * in the superproject's 'modules' directory.  In this case the
 204                  * submodule would not have a worktree.
 205                  */
 206                 strbuf_reset(&gitdir);
 207                 strbuf_repo_git_path(&gitdir, superproject,
 208                                      "modules/%s", sub->name);
 209
 210                 if (repo_init(submodule, gitdir.buf, NULL)) {
 211                         ret = -1;
 212                         goto out;
 213                 }
 214         }
 215
 216         submodule->submodule_prefix = xstrfmt("%s%s/",
 217                                               superproject->submodule_prefix ?
 218                                               superproject->submodule_prefix :
 219                                               "", path);
 220
 221 out:
 222         strbuf_release(&gitdir);
 223         strbuf_release(&worktree);
 224         return ret;
 225 }
 226
 227 void repo_clear(struct repository *repo)
 228 {
 229         FREE_AND_NULL(repo->gitdir);
 230         FREE_AND_NULL(repo->commondir);
 231         FREE_AND_NULL(repo->graft_file);
 232         FREE_AND_NULL(repo->index_file);
 233         FREE_AND_NULL(repo->worktree);
 234         FREE_AND_NULL(repo->submodule_prefix);
 235
 236         raw_object_store_clear(repo->objects);
 237         FREE_AND_NULL(repo->objects);
 238
 239         parsed_object_pool_clear(repo->parsed_objects);
 240         FREE_AND_NULL(repo->parsed_objects);
 241
 242         if (repo->config) {
 243                 git_configset_clear(repo->config);
 244                 FREE_AND_NULL(repo->config);
 245         }
 246
 247         if (repo->submodule_cache) {
 248                 submodule_cache_free(repo->submodule_cache);
 249                 repo->submodule_cache = NULL;
 250         }
 251
 252         if (repo->index) {
 253                 discard_index(repo->index);
 254                 if (repo->index != &the_index)
 255                         FREE_AND_NULL(repo->index);
 256         }
 257 }
 258
 259 int repo_read_index(struct repository *repo)
 260 {
 261         if (!repo->index)
 262                 repo->index = xcalloc(1, sizeof(*repo->index));
 263
 264         return read_index_from(repo->index, repo->index_file, repo->gitdir);
 265 }