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
  14 /* The main repository */
  15 static struct repository the_repo;
  16 struct repository *the_repository;
  17 struct index_state the_index;
  18
  19 void initialize_the_repository(void)
  20 {
  21         the_repository = &the_repo;
  22
  23         the_repo.index = &the_index;
  24         the_repo.objects = raw_object_store_new();
  25         the_repo.parsed_objects = parsed_object_pool_new();
  26
  27         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  28 }
  29
  30 static void expand_base_dir(char **out, const char *in,
  31                             const char *base_dir, const char *def_in)
  32 {
  33         free(*out);
  34         if (in)
  35                 *out = xstrdup(in);
  36         else
  37                 *out = xstrfmt("%s/%s", base_dir, def_in);
  38 }
  39
  40 static void repo_set_commondir(struct repository *repo,
  41                                const char *commondir)
  42 {
  43         struct strbuf sb = STRBUF_INIT;
  44
  45         free(repo->commondir);
  46
  47         if (commondir) {
  48                 repo->different_commondir = 1;
  49                 repo->commondir = xstrdup(commondir);
  50                 return;
  51         }
  52
  53         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  54         repo->commondir = strbuf_detach(&sb, NULL);
  55 }
  56
  57 void repo_set_gitdir(struct repository *repo,
  58                      const char *root,
  59                      const struct set_gitdir_args *o)
  60 {
  61         const char *gitfile = read_gitfile(root);
  62         /*
  63          * repo->gitdir is saved because the caller could pass "root"
  64          * that also points to repo->gitdir. We want to keep it alive
  65          * until after xstrdup(root). Then we can free it.
  66          */
  67         char *old_gitdir = repo->gitdir;
  68
  69         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  70         free(old_gitdir);
  71
  72         repo_set_commondir(repo, o->commondir);
  73
  74         if (!repo->objects->odb) {
  75                 repo->objects->odb = xcalloc(1, sizeof(*repo->objects->odb));
  76                 repo->objects->odb_tail = &repo->objects->odb->next;
  77         }
  78         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  79                         repo->commondir, "objects");
  80
  81         free(repo->objects->alternate_db);
  82         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  83         expand_base_dir(&repo->graft_file, o->graft_file,
  84                         repo->commondir, "info/grafts");
  85         expand_base_dir(&repo->index_file, o->index_file,
  86                         repo->gitdir, "index");
  87 }
  88
  89 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  90 {
  91         repo->hash_algo = &hash_algos[hash_algo];
  92 #ifndef ENABLE_SHA256
  93         if (hash_algo != GIT_HASH_SHA1)
  94                 die(_("The hash algorithm %s is not supported in this build."), repo->hash_algo->name);
  95 #endif
  96 }
  97
  98 /*
  99  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 100  * Return 0 upon success and a non-zero value upon failure.
 101  */
 102 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
 103 {
 104         int ret = 0;
 105         int error = 0;
 106         char *abspath = NULL;
 107         const char *resolved_gitdir;
 108         struct set_gitdir_args args = { NULL };
 109
 110         abspath = real_pathdup(gitdir, 0);
 111         if (!abspath) {
 112                 ret = -1;
 113                 goto out;
 114         }
 115
 116         /* 'gitdir' must reference the gitdir directly */
 117         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 118         if (!resolved_gitdir) {
 119                 ret = -1;
 120                 goto out;
 121         }
 122
 123         repo_set_gitdir(repo, resolved_gitdir, &args);
 124
 125 out:
 126         free(abspath);
 127         return ret;
 128 }
 129
 130 void repo_set_worktree(struct repository *repo, const char *path)
 131 {
 132         repo->worktree = real_pathdup(path, 1);
 133
 134         trace2_def_repo(repo);
 135 }
 136
 137 static int read_and_verify_repository_format(struct repository_format *format,
 138                                              const char *commondir)
 139 {
 140         int ret = 0;
 141         struct strbuf sb = STRBUF_INIT;
 142
 143         strbuf_addf(&sb, "%s/config", commondir);
 144         read_repository_format(format, sb.buf);
 145         strbuf_reset(&sb);
 146
 147         if (verify_repository_format(format, &sb) < 0) {
 148                 warning("%s", sb.buf);
 149                 ret = -1;
 150         }
 151
 152         strbuf_release(&sb);
 153         return ret;
 154 }
 155
 156 /*
 157  * Initialize 'repo' based on the provided 'gitdir'.
 158  * Return 0 upon success and a non-zero value upon failure.
 159  */
 160 int repo_init(struct repository *repo,
 161               const char *gitdir,
 162               const char *worktree)
 163 {
 164         struct repository_format format = REPOSITORY_FORMAT_INIT;
 165         memset(repo, 0, sizeof(*repo));
 166
 167         repo->objects = raw_object_store_new();
 168         repo->parsed_objects = parsed_object_pool_new();
 169
 170         if (repo_init_gitdir(repo, gitdir))
 171                 goto error;
 172
 173         if (read_and_verify_repository_format(&format, repo->commondir))
 174                 goto error;
 175
 176         repo_set_hash_algo(repo, format.hash_algo);
 177
 178         if (worktree)
 179                 repo_set_worktree(repo, worktree);
 180
 181         clear_repository_format(&format);
 182         return 0;
 183
 184 error:
 185         repo_clear(repo);
 186         return -1;
 187 }
 188
 189 int repo_submodule_init(struct repository *subrepo,
 190                         struct repository *superproject,
 191                         const struct submodule *sub)
 192 {
 193         struct strbuf gitdir = STRBUF_INIT;
 194         struct strbuf worktree = STRBUF_INIT;
 195         int ret = 0;
 196
 197         if (!sub) {
 198                 ret = -1;
 199                 goto out;
 200         }
 201
 202         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", sub->path);
 203         strbuf_repo_worktree_path(&worktree, superproject, "%s", sub->path);
 204
 205         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
 206                 /*
 207                  * If initialization fails then it may be due to the submodule
 208                  * not being populated in the superproject's worktree.  Instead
 209                  * we can try to initialize the submodule by finding it's gitdir
 210                  * in the superproject's 'modules' directory.  In this case the
 211                  * submodule would not have a worktree.
 212                  */
 213                 strbuf_reset(&gitdir);
 214                 strbuf_repo_git_path(&gitdir, superproject,
 215                                      "modules/%s", sub->name);
 216
 217                 if (repo_init(subrepo, gitdir.buf, NULL)) {
 218                         ret = -1;
 219                         goto out;
 220                 }
 221         }
 222
 223         subrepo->submodule_prefix = xstrfmt("%s%s/",
 224                                             superproject->submodule_prefix ?
 225                                             superproject->submodule_prefix :
 226                                             "", sub->path);
 227
 228 out:
 229         strbuf_release(&gitdir);
 230         strbuf_release(&worktree);
 231         return ret;
 232 }
 233
 234 void repo_clear(struct repository *repo)
 235 {
 236         FREE_AND_NULL(repo->gitdir);
 237         FREE_AND_NULL(repo->commondir);
 238         FREE_AND_NULL(repo->graft_file);
 239         FREE_AND_NULL(repo->index_file);
 240         FREE_AND_NULL(repo->worktree);
 241         FREE_AND_NULL(repo->submodule_prefix);
 242
 243         raw_object_store_clear(repo->objects);
 244         FREE_AND_NULL(repo->objects);
 245
 246         parsed_object_pool_clear(repo->parsed_objects);
 247         FREE_AND_NULL(repo->parsed_objects);
 248
 249         if (repo->config) {
 250                 git_configset_clear(repo->config);
 251                 FREE_AND_NULL(repo->config);
 252         }
 253
 254         if (repo->submodule_cache) {
 255                 submodule_cache_free(repo->submodule_cache);
 256                 repo->submodule_cache = NULL;
 257         }
 258
 259         if (repo->index) {
 260                 discard_index(repo->index);
 261                 if (repo->index != &the_index)
 262                         FREE_AND_NULL(repo->index);
 263         }
 264 }
 265
 266 int repo_read_index(struct repository *repo)
 267 {
 268         if (!repo->index)
 269                 repo->index = xcalloc(1, sizeof(*repo->index));
 270
 271         return read_index_from(repo->index, repo->index_file, repo->gitdir);
 272 }
 273
 274 int repo_hold_locked_index(struct repository *repo,
 275                            struct lock_file *lf,
 276                            int flags)
 277 {
 278         if (!repo->index_file)
 279                 BUG("the repo hasn't been setup");
 280         return hold_lock_file_for_update(lf, repo->index_file, flags);
 281 }