+/*
+ * Test it it looks like we're at the top
+ * level git directory. We want to see a
+ *
+ * - either a .git/objects/ directory _or_ the proper
+ * GIT_OBJECT_DIRECTORY environment variable
+ * - a refs/ directory under ".git"
+ * - either a HEAD symlink or a HEAD file that is formatted as
+ * a proper "ref:".
+ */
+static int is_toplevel_directory(void)
+{
+ if (access(".git/refs/", X_OK) ||
+ access(getenv(DB_ENVIRONMENT) ?
+ getenv(DB_ENVIRONMENT) : ".git/objects/", X_OK) ||
+ validate_symref(".git/HEAD"))
+ return 0;
+ return 1;
+}
+