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 }
  93
  94 /*
  95  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  96  * Return 0 upon success and a non-zero value upon failure.
  97  */
  98 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
  99 {
 100         int ret = 0;
 101         int error = 0;
 102         char *abspath = NULL;
 103         const char *resolved_gitdir;
 104         struct set_gitdir_args args = { NULL };
 105
 106         abspath = real_pathdup(gitdir, 0);
 107         if (!abspath) {
 108                 ret = -1;
 109                 goto out;
 110         }
 111
 112         /* 'gitdir' must reference the gitdir directly */
 113         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 114         if (!resolved_gitdir) {
 115                 ret = -1;
 116                 goto out;
 117         }
 118
 119         repo_set_gitdir(repo, resolved_gitdir, &args);
 120
 121 out:
 122         free(abspath);
 123         return ret;
 124 }
 125
 126 void repo_set_worktree(struct repository *repo, const char *path)
 127 {
 128         repo->worktree = real_pathdup(path, 1);
 129 }
 130
 131 static int read_and_verify_repository_format(struct repository_format *format,
 132                                              const char *commondir)
 133 {
 134         int ret = 0;
 135         struct strbuf sb = STRBUF_INIT;
 136
 137         strbuf_addf(&sb, "%s/config", commondir);
 138         read_repository_format(format, sb.buf);
 139         strbuf_reset(&sb);
 140
 141         if (verify_repository_format(format, &sb) < 0) {
 142                 warning("%s", sb.buf);
 143                 ret = -1;
 144         }
 145
 146         strbuf_release(&sb);
 147         return ret;
 148 }
 149
 150 /*
 151  * Initialize 'repo' based on the provided 'gitdir'.
 152  * Return 0 upon success and a non-zero value upon failure.
 153  */
 154 int repo_init(struct repository *repo,
 155               const char *gitdir,
 156               const char *worktree)
 157 {
 158         struct repository_format format;
 159         memset(repo, 0, sizeof(*repo));
 160
 161         repo->objects = raw_object_store_new();
 162         repo->parsed_objects = parsed_object_pool_new();
 163
 164         if (repo_init_gitdir(repo, gitdir))
 165                 goto error;
 166
 167         if (read_and_verify_repository_format(&format, repo->commondir))
 168                 goto error;
 169
 170         repo_set_hash_algo(repo, format.hash_algo);
 171
 172         if (worktree)
 173                 repo_set_worktree(repo, worktree);
 174
 175         return 0;
 176
 177 error:
 178         repo_clear(repo);
 179         return -1;
 180 }
 181
 182 int repo_submodule_init(struct repository *subrepo,
 183                         struct repository *superproject,
 184                         const struct submodule *sub)
 185 {
 186         struct strbuf gitdir = STRBUF_INIT;
 187         struct strbuf worktree = STRBUF_INIT;
 188         int ret = 0;
 189
 190         if (!sub) {
 191                 ret = -1;
 192                 goto out;
 193         }
 194
 195         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", sub->path);
 196         strbuf_repo_worktree_path(&worktree, superproject, "%s", sub->path);
 197
 198         if (repo_init(subrepo, 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(subrepo, gitdir.buf, NULL)) {
 211                         ret = -1;
 212                         goto out;
 213                 }
 214         }
 215
 216         subrepo->submodule_prefix = xstrfmt("%s%s/",
 217                                             superproject->submodule_prefix ?
 218                                             superproject->submodule_prefix :
 219                                             "", sub->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 }
 266
 267 int repo_hold_locked_index(struct repository *repo,
 268                            struct lock_file *lf,
 269                            int flags)
 270 {
 271         if (!repo->index_file)
 272                 BUG("the repo hasn't been setup");
 273         return hold_lock_file_for_update(lf, repo->index_file, flags);
 274 }