#!/bin/sh
 
-. git-sh-setup
+# git-ls-remote could be called from outside a git managed repository;
+# this would fail in that case and would issue an error message.
+GIT_DIR=$(git-rev-parse --git-dir 2>/dev/null) || :;
 
 get_data_source () {
        case "$1" in
                heads/* | tags/* ) local="refs/$local" ;;
                *) local="refs/heads/$local" ;;
                esac
+
+               if local_ref_name=$(expr "$local" : 'refs/\(.*\)')
+               then
+                  git-check-ref-format "$local_ref_name" ||
+                  die "* refusing to create funny ref '$local_ref_name' locally"
+               fi
                echo "${dot_prefix}${force}${remote}:${local}"
                dot_prefix=.
        done