$ git clone -n https://src.fedoraproject.org/rpms/plasma-systemmonitor.git /var/lib/mock/f42-build-862347-170742/root/chroot_tmpdir/scmroot/plasma-systemmonitor
Cloning into '/var/lib/mock/f42-build-862347-170742/root/chroot_tmpdir/scmroot/plasma-systemmonitor'...
$ git fetch origin f8078b2bb9a1d454e7190df215f9c866d1e64c6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-systemmonitor
 * [new ref]         f8078b2bb9a1d454e7190df215f9c866d1e64c6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8078b2 6.2.4