$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f40-build-803121-144180/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f40-build-803121-144180/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin 2c6351f6604de2f532efd87f1c976b29a1b2c3a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         2c6351f6604de2f532efd87f1c976b29a1b2c3a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c6351f 6.0.3