$ git clone -n https://src.fedoraproject.org/rpms/plasma-systemmonitor.git /var/lib/mock/f42-build-3442840-45457/root/chroot_tmpdir/scmroot/plasma-systemmonitor
Cloning into '/var/lib/mock/f42-build-3442840-45457/root/chroot_tmpdir/scmroot/plasma-systemmonitor'...
$ git fetch origin 6237d0643c78cae731998319f01f85e27d0a68a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-systemmonitor
 * [new ref]         6237d0643c78cae731998319f01f85e27d0a68a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6237d06 6.3.3