$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f40-build-788899-135456/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f40-build-788899-135456/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin 7640187a8f0a97fcdbf7e579969c7a79c8faf315:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         7640187a8f0a97fcdbf7e579969c7a79c8faf315 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7640187 6.0.0