$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f42-build-881264-183509/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f42-build-881264-183509/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin a997ef772a4e80a5f0fde551746d66dc06c78509:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         a997ef772a4e80a5f0fde551746d66dc06c78509 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a997ef7 6.3.2