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