3 const char *prefix_path(const char *prefix, int len, const char *path)
5 const char *orig = path;
31 /* Remove last component of the prefix */
34 die("'%s' is outside repository", orig);
36 } while (len && prefix[len-1] != '/');
40 int speclen = strlen(path);
41 char *n = xmalloc(speclen + len + 1);
43 memcpy(n, prefix, len);
44 memcpy(n + len, path, speclen+1);
50 const char **get_pathspec(const char *prefix, const char **pathspec)
52 const char *entry = *pathspec;
56 if (!prefix && !entry)
60 static const char *spec[2];
66 /* Otherwise we have to re-write the entries.. */
68 prefixlen = prefix ? strlen(prefix) : 0;
70 *p = prefix_path(prefix, prefixlen, entry);
71 } while ((entry = *++p) != NULL);
72 return (const char **) pathspec;
76 * Test if it looks like we're at the top level git directory.
79 * - either a .git/objects/ directory _or_ the proper
80 * GIT_OBJECT_DIRECTORY environment variable
81 * - a refs/ directory under ".git"
82 * - either a HEAD symlink or a HEAD file that is formatted as
85 static int is_toplevel_directory(void)
87 if (access(".git/refs/", X_OK) ||
88 access(getenv(DB_ENVIRONMENT) ?
89 getenv(DB_ENVIRONMENT) : ".git/objects/", X_OK) ||
90 validate_symref(".git/HEAD"))
95 static const char *setup_git_directory_1(void)
97 static char cwd[PATH_MAX+1];
101 * If GIT_DIR is set explicitly, we're not going
102 * to do any discovery, but we still do repository
105 if (getenv(GIT_DIR_ENVIRONMENT)) {
107 int len = strlen(getenv(GIT_DIR_ENVIRONMENT));
108 if (sizeof(path) - 40 < len)
109 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
110 memcpy(path, getenv(GIT_DIR_ENVIRONMENT), len);
112 strcpy(path + len, "/refs");
113 if (access(path, X_OK))
114 goto bad_dir_environ;
115 strcpy(path + len, "/HEAD");
116 if (validate_symref(path))
117 goto bad_dir_environ;
118 if (getenv(DB_ENVIRONMENT)) {
119 if (access(DB_ENVIRONMENT, X_OK))
120 goto bad_dir_environ;
123 strcpy(path + len, "/objects");
124 if (access(path, X_OK))
125 goto bad_dir_environ;
130 die("Not a git repository: '%s'", path);
133 if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/')
134 die("Unable to read current working directory");
136 offset = len = strlen(cwd);
138 if (is_toplevel_directory())
143 die("Not a git repository");
144 } while (cwd[--offset] != '/');
150 /* Make "offset" point to past the '/', and add a '/' at the end */
157 int check_repository_format_version(const char *var, const char *value)
159 if (strcmp(var, "core.repositoryformatversion") == 0)
160 repository_format_version = git_config_int(var, value);
164 int check_repository_format(void)
166 git_config(check_repository_format_version);
167 if (GIT_REPO_VERSION < repository_format_version)
168 die ("Expected git repo version <= %d, found %d",
169 GIT_REPO_VERSION, repository_format_version);
173 const char *setup_git_directory(void)
175 const char *retval = setup_git_directory_1();
176 check_repository_format();