$ git clone -n https://src.fedoraproject.org/rpms/plasma-activities-stats.git /var/lib/mock/f42-build-side-1-3506366-45996/root/chroot_tmpdir/scmroot/plasma-activities-stats
Cloning into '/var/lib/mock/f42-build-side-1-3506366-45996/root/chroot_tmpdir/scmroot/plasma-activities-stats'...
$ git fetch origin ed383d8e2f67a1b7dd34c5e187beb215b513c21d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-activities-stats
 * [new ref]         ed383d8e2f67a1b7dd34c5e187beb215b513c21d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed383d8 6.3.4