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 = &the_repo;
   9
  10 static char *git_path_from_env(const char *envvar, const char *git_dir,
  11                                const char *path, int fromenv)
  12 {
  13         if (fromenv) {
  14                 const char *value = getenv(envvar);
  15                 if (value)
  16                         return xstrdup(value);
  17         }
  18
  19         return xstrfmt("%s/%s", git_dir, path);
  20 }
  21
  22 static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv)
  23 {
  24         if (fromenv) {
  25                 const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT);
  26                 if (value) {
  27                         strbuf_addstr(sb, value);
  28                         return 1;
  29                 }
  30         }
  31
  32         return get_common_dir_noenv(sb, gitdir);
  33 }
  34
  35 static void repo_setup_env(struct repository *repo)
  36 {
  37         struct strbuf sb = STRBUF_INIT;
  38
  39         repo->different_commondir = find_common_dir(&sb, repo->gitdir,
  40                                                     !repo->ignore_env);
  41         repo->commondir = strbuf_detach(&sb, NULL);
  42         repo->objectdir = git_path_from_env(DB_ENVIRONMENT, repo->commondir,
  43                                             "objects", !repo->ignore_env);
  44         repo->graft_file = git_path_from_env(GRAFT_ENVIRONMENT, repo->commondir,
  45                                              "info/grafts", !repo->ignore_env);
  46         repo->index_file = git_path_from_env(INDEX_ENVIRONMENT, repo->gitdir,
  47                                              "index", !repo->ignore_env);
  48 }
  49
  50 void repo_set_gitdir(struct repository *repo, const char *path)
  51 {
  52         const char *gitfile = read_gitfile(path);
  53
  54         /*
  55          * NEEDSWORK: Eventually we want to be able to free gitdir and the rest
  56          * of the environment before reinitializing it again, but we have some
  57          * crazy code paths where we try to set gitdir with the current gitdir
  58          * and we don't want to free gitdir before copying the passed in value.
  59          */
  60         repo->gitdir = xstrdup(gitfile ? gitfile : path);
  61
  62         repo_setup_env(repo);
  63 }
  64
  65 /*
  66  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  67  * Return 0 upon success and a non-zero value upon failure.
  68  */
  69 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
  70 {
  71         int ret = 0;
  72         int error = 0;
  73         char *abspath = NULL;
  74         const char *resolved_gitdir;
  75
  76         abspath = real_pathdup(gitdir, 0);
  77         if (!abspath) {
  78                 ret = -1;
  79                 goto out;
  80         }
  81
  82         /* 'gitdir' must reference the gitdir directly */
  83         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
  84         if (!resolved_gitdir) {
  85                 ret = -1;
  86                 goto out;
  87         }
  88
  89         repo_set_gitdir(repo, resolved_gitdir);
  90
  91 out:
  92         free(abspath);
  93         return ret;
  94 }
  95
  96 void repo_set_worktree(struct repository *repo, const char *path)
  97 {
  98         repo->worktree = real_pathdup(path, 1);
  99 }
 100
 101 static int read_and_verify_repository_format(struct repository_format *format,
 102                                              const char *commondir)
 103 {
 104         int ret = 0;
 105         struct strbuf sb = STRBUF_INIT;
 106
 107         strbuf_addf(&sb, "%s/config", commondir);
 108         read_repository_format(format, sb.buf);
 109         strbuf_reset(&sb);
 110
 111         if (verify_repository_format(format, &sb) < 0) {
 112                 warning("%s", sb.buf);
 113                 ret = -1;
 114         }
 115
 116         strbuf_release(&sb);
 117         return ret;
 118 }
 119
 120 /*
 121  * Initialize 'repo' based on the provided 'gitdir'.
 122  * Return 0 upon success and a non-zero value upon failure.
 123  */
 124 int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
 125 {
 126         struct repository_format format;
 127         memset(repo, 0, sizeof(*repo));
 128
 129         repo->ignore_env = 1;
 130
 131         if (repo_init_gitdir(repo, gitdir))
 132                 goto error;
 133
 134         if (read_and_verify_repository_format(&format, repo->commondir))
 135                 goto error;
 136
 137         if (worktree)
 138                 repo_set_worktree(repo, worktree);
 139
 140         return 0;
 141
 142 error:
 143         repo_clear(repo);
 144         return -1;
 145 }
 146
 147 void repo_clear(struct repository *repo)
 148 {
 149         free(repo->gitdir);
 150         repo->gitdir = NULL;
 151         free(repo->commondir);
 152         repo->commondir = NULL;
 153         free(repo->objectdir);
 154         repo->objectdir = NULL;
 155         free(repo->graft_file);
 156         repo->graft_file = NULL;
 157         free(repo->index_file);
 158         repo->index_file = NULL;
 159         free(repo->worktree);
 160         repo->worktree = NULL;
 161
 162         if (repo->config) {
 163                 git_configset_clear(repo->config);
 164                 free(repo->config);
 165                 repo->config = NULL;
 166         }
 167
 168         if (repo->submodule_cache) {
 169                 submodule_cache_free(repo->submodule_cache);
 170                 repo->submodule_cache = NULL;
 171         }
 172
 173         if (repo->index) {
 174                 discard_index(repo->index);
 175                 free(repo->index);
 176                 repo->index = NULL;
 177         }
 178 }
 179
 180 int repo_read_index(struct repository *repo)
 181 {
 182         if (!repo->index)
 183                 repo->index = xcalloc(1, sizeof(*repo->index));
 184         else
 185                 discard_index(repo->index);
 186
 187         return read_index_from(repo->index, repo->index_file);
 188 }