$ git clone -n https://src.fedoraproject.org/rpms/python-indexed_gzip.git /var/lib/mock/f40-build-770895-125901/root/chroot_tmpdir/scmroot/python-indexed_gzip
Cloning into '/var/lib/mock/f40-build-770895-125901/root/chroot_tmpdir/scmroot/python-indexed_gzip'...
$ git fetch origin 63dda6c90f429a51d2a8fb6bfc2dc07b5098ffba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-indexed_gzip
 * [new ref]         63dda6c90f429a51d2a8fb6bfc2dc07b5098ffba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63dda6c Update to 1.8.7 (close RHBZ#2248517)