$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f42-bootstrap-3533815-46421/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f42-bootstrap-3533815-46421/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin 7e052eb0b2ad208a318803aa89ac1f9c27eec822:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         7e052eb0b2ad208a318803aa89ac1f9c27eec822 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e052eb 6.3.5