$ git clone -n https://src.fedoraproject.org/rpms/plasma-activities-stats.git /var/lib/mock/f42-build-side-1-3584862-46896/root/chroot_tmpdir/scmroot/plasma-activities-stats
Cloning into '/var/lib/mock/f42-build-side-1-3584862-46896/root/chroot_tmpdir/scmroot/plasma-activities-stats'...
$ git fetch origin 4be1cc39455bfe29b8cbccf7795ec327470f0f81:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-activities-stats
 * [new ref]         4be1cc39455bfe29b8cbccf7795ec327470f0f81 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4be1cc3 6.4.2