$ git clone -n https://src.fedoraproject.org/rpms/python-ruamel-yaml.git /var/lib/mock/f40-build-2231990-53316/root/chroot_tmpdir/scmroot/python-ruamel-yaml
Cloning into '/var/lib/mock/f40-build-2231990-53316/root/chroot_tmpdir/scmroot/python-ruamel-yaml'...
$ git fetch origin 25d71c1f4c2caad31342fd8af39f2ebb80017f8b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-ruamel-yaml
 * [new ref]         25d71c1f4c2caad31342fd8af39f2ebb80017f8b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25d71c1 Update to 0.18.5