$ git clone -n https://src.fedoraproject.org/rpms/xscreensaver.git /var/lib/mock/f39-build-1707094-41222/root/chroot_tmpdir/scmroot/xscreensaver
Cloning into '/var/lib/mock/f39-build-1707094-41222/root/chroot_tmpdir/scmroot/xscreensaver'...
$ git fetch origin 888a18ebbe4270eba13f45520da6e4ec1cc4a2ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xscreensaver
 * [new ref]         888a18ebbe4270eba13f45520da6e4ec1cc4a2ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 888a18e Update to 6.08