$ git clone -n https://src.fedoraproject.org/rpms/cockpit-machines.git /var/lib/mock/f45-build-4532-332/root/chroot_tmpdir/scmroot/cockpit-machines
Cloning into '/var/lib/mock/f45-build-4532-332/root/chroot_tmpdir/scmroot/cockpit-machines'...
$ git fetch origin d804cc6b7ecec258fcd7802ea31e1bb49ad0faac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-machines
 * [new ref]         d804cc6b7ecec258fcd7802ea31e1bb49ad0faac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d804cc6 Update to 356 upstream release