$ git clone -n https://src.fedoraproject.org/rpms/plasma-activities-stats.git /var/lib/mock/f41-build-823947-153914/root/chroot_tmpdir/scmroot/plasma-activities-stats
Cloning into '/var/lib/mock/f41-build-823947-153914/root/chroot_tmpdir/scmroot/plasma-activities-stats'...
$ git fetch origin c4f89f09324ed698ec950c718217d03b836e76a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-activities-stats
 * [new ref]         c4f89f09324ed698ec950c718217d03b836e76a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4f89f0 rebuild