$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f41-build-824857-154234/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f41-build-824857-154234/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin 30358fb7017f901456dd9e67c2c1b71015804979:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         30358fb7017f901456dd9e67c2c1b71015804979 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30358fb rebuild