$ git clone -n https://src.fedoraproject.org/rpms/plasma-systemmonitor.git /var/lib/mock/f42-build-side-1-3578417-46814/root/chroot_tmpdir/scmroot/plasma-systemmonitor
Cloning into '/var/lib/mock/f42-build-side-1-3578417-46814/root/chroot_tmpdir/scmroot/plasma-systemmonitor'...
$ git fetch origin 8046e2b8a13f18fb6146a79f8f2f40148c5bf088:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-systemmonitor
 * [new ref]         8046e2b8a13f18fb6146a79f8f2f40148c5bf088 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8046e2b 6.4.1