$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f45-build-39865-763/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f45-build-39865-763/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin 6366250669b535541d70eaa405a03c0314cfa2c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         6366250669b535541d70eaa405a03c0314cfa2c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6366250 6.7.5