$ git clone -n https://src.fedoraproject.org/rpms/plasma-activities-stats.git /var/lib/mock/f42-build-870637-177260/root/chroot_tmpdir/scmroot/plasma-activities-stats
Cloning into '/var/lib/mock/f42-build-870637-177260/root/chroot_tmpdir/scmroot/plasma-activities-stats'...
$ git fetch origin 6b86caec130e4b7f05514179bf7db4d8d2c628c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-activities-stats
 * [new ref]         6b86caec130e4b7f05514179bf7db4d8d2c628c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b86cae 6.3.0