$ git clone -n https://src.fedoraproject.org/rpms/plasma-systemmonitor.git /var/lib/mock/f40-build-2406607-60558/root/chroot_tmpdir/scmroot/plasma-systemmonitor
Cloning into '/var/lib/mock/f40-build-2406607-60558/root/chroot_tmpdir/scmroot/plasma-systemmonitor'...
$ git fetch origin a90a3aa3efdcbfa5261af39bdbe5f0ebe194c7bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-systemmonitor
 * [new ref]         a90a3aa3efdcbfa5261af39bdbe5f0ebe194c7bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a90a3aa Obsolete ksysguard (rhbz#2264162)