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         NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, 0, 0
   9 };
  10 struct repository *the_repository = &the_repo;
  11
  12 static char *git_path_from_env(const char *envvar, const char *git_dir,
  13                                const char *path, int fromenv)
  14 {
  15         if (fromenv) {
  16                 const char *value = getenv(envvar);
  17                 if (value)
  18                         return xstrdup(value);
  19         }
  20
  21         return xstrfmt("%s/%s", git_dir, path);
  22 }
  23
  24 static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv)
  25 {
  26         if (fromenv) {
  27                 const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT);
  28                 if (value) {
  29                         strbuf_addstr(sb, value);
  30                         return 1;
  31                 }
  32         }
  33
  34         return get_common_dir_noenv(sb, gitdir);
  35 }
  36
  37 static void repo_setup_env(struct repository *repo)
  38 {
  39         struct strbuf sb = STRBUF_INIT;
  40
  41         repo->different_commondir = find_common_dir(&sb, repo->gitdir,
  42                                                     !repo->ignore_env);
  43         repo->commondir = strbuf_detach(&sb, NULL);
  44         repo->objectdir = git_path_from_env(DB_ENVIRONMENT, repo->commondir,
  45                                             "objects", !repo->ignore_env);
  46         repo->graft_file = git_path_from_env(GRAFT_ENVIRONMENT, repo->commondir,
  47                                              "info/grafts", !repo->ignore_env);
  48         repo->index_file = git_path_from_env(INDEX_ENVIRONMENT, repo->gitdir,
  49                                              "index", !repo->ignore_env);
  50 }
  51
  52 void repo_set_gitdir(struct repository *repo, const char *path)
  53 {
  54         const char *gitfile = read_gitfile(path);
  55
  56         /*
  57          * NEEDSWORK: Eventually we want to be able to free gitdir and the rest
  58          * of the environment before reinitializing it again, but we have some
  59          * crazy code paths where we try to set gitdir with the current gitdir
  60          * and we don't want to free gitdir before copying the passed in value.
  61          */
  62         repo->gitdir = xstrdup(gitfile ? gitfile : path);
  63
  64         repo_setup_env(repo);
  65 }
  66
  67 /*
  68  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  69  * Return 0 upon success and a non-zero value upon failure.
  70  */
  71 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
  72 {
  73         int ret = 0;
  74         int error = 0;
  75         char *abspath = NULL;
  76         const char *resolved_gitdir;
  77
  78         abspath = real_pathdup(gitdir, 0);
  79         if (!abspath) {
  80                 ret = -1;
  81                 goto out;
  82         }
  83
  84         /* 'gitdir' must reference the gitdir directly */
  85         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
  86         if (!resolved_gitdir) {
  87                 ret = -1;
  88                 goto out;
  89         }
  90
  91         repo_set_gitdir(repo, resolved_gitdir);
  92
  93 out:
  94         free(abspath);
  95         return ret;
  96 }
  97
  98 void repo_set_worktree(struct repository *repo, const char *path)
  99 {
 100         repo->worktree = real_pathdup(path, 1);
 101 }
 102
 103 static int read_and_verify_repository_format(struct repository_format *format,
 104                                              const char *commondir)
 105 {
 106         int ret = 0;
 107         struct strbuf sb = STRBUF_INIT;
 108
 109         strbuf_addf(&sb, "%s/config", commondir);
 110         read_repository_format(format, sb.buf);
 111         strbuf_reset(&sb);
 112
 113         if (verify_repository_format(format, &sb) < 0) {
 114                 warning("%s", sb.buf);
 115                 ret = -1;
 116         }
 117
 118         strbuf_release(&sb);
 119         return ret;
 120 }
 121
 122 /*
 123  * Initialize 'repo' based on the provided 'gitdir'.
 124  * Return 0 upon success and a non-zero value upon failure.
 125  */
 126 int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
 127 {
 128         struct repository_format format;
 129         memset(repo, 0, sizeof(*repo));
 130
 131         repo->ignore_env = 1;
 132
 133         if (repo_init_gitdir(repo, gitdir))
 134                 goto error;
 135
 136         if (read_and_verify_repository_format(&format, repo->commondir))
 137                 goto error;
 138
 139         if (worktree)
 140                 repo_set_worktree(repo, worktree);
 141
 142         return 0;
 143
 144 error:
 145         repo_clear(repo);
 146         return -1;
 147 }
 148
 149 /*
 150  * Initialize 'submodule' as the submodule given by 'path' in parent repository
 151  * 'superproject'.
 152  * Return 0 upon success and a non-zero value upon failure.
 153  */
 154 int repo_submodule_init(struct repository *submodule,
 155                         struct repository *superproject,
 156                         const char *path)
 157 {
 158         const struct submodule *sub;
 159         struct strbuf gitdir = STRBUF_INIT;
 160         struct strbuf worktree = STRBUF_INIT;
 161         int ret = 0;
 162
 163         sub = submodule_from_cache(superproject, &null_oid, path);
 164         if (!sub) {
 165                 ret = -1;
 166                 goto out;
 167         }
 168
 169         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 170         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 171
 172         if (repo_init(submodule, gitdir.buf, worktree.buf)) {
 173                 /*
 174                  * If initilization fails then it may be due to the submodule
 175                  * not being populated in the superproject's worktree.  Instead
 176                  * we can try to initilize the submodule by finding it's gitdir
 177                  * in the superproject's 'modules' directory.  In this case the
 178                  * submodule would not have a worktree.
 179                  */
 180                 strbuf_reset(&gitdir);
 181                 strbuf_repo_git_path(&gitdir, superproject,
 182                                      "modules/%s", sub->name);
 183
 184                 if (repo_init(submodule, gitdir.buf, NULL)) {
 185                         ret = -1;
 186                         goto out;
 187                 }
 188         }
 189
 190         submodule->submodule_prefix = xstrfmt("%s%s/",
 191                                               superproject->submodule_prefix ?
 192                                               superproject->submodule_prefix :
 193                                               "", path);
 194
 195 out:
 196         strbuf_release(&gitdir);
 197         strbuf_release(&worktree);
 198         return ret;
 199 }
 200
 201 void repo_clear(struct repository *repo)
 202 {
 203         free(repo->gitdir);
 204         repo->gitdir = NULL;
 205         free(repo->commondir);
 206         repo->commondir = NULL;
 207         free(repo->objectdir);
 208         repo->objectdir = NULL;
 209         free(repo->graft_file);
 210         repo->graft_file = NULL;
 211         free(repo->index_file);
 212         repo->index_file = NULL;
 213         free(repo->worktree);
 214         repo->worktree = NULL;
 215         free(repo->submodule_prefix);
 216         repo->submodule_prefix = NULL;
 217
 218         if (repo->config) {
 219                 git_configset_clear(repo->config);
 220                 free(repo->config);
 221                 repo->config = NULL;
 222         }
 223
 224         if (repo->submodule_cache) {
 225                 submodule_cache_free(repo->submodule_cache);
 226                 repo->submodule_cache = NULL;
 227         }
 228
 229         if (repo->index) {
 230                 discard_index(repo->index);
 231                 free(repo->index);
 232                 repo->index = NULL;
 233         }
 234 }
 235
 236 int repo_read_index(struct repository *repo)
 237 {
 238         if (!repo->index)
 239                 repo->index = xcalloc(1, sizeof(*repo->index));
 240
 241         return read_index_from(repo->index, repo->index_file);
 242 }