$ git clone -n https://src.fedoraproject.org/rpms/relval.git /var/lib/mock/f42-build-side-1-3536488-46558/root/chroot_tmpdir/scmroot/relval
Cloning into '/var/lib/mock/f42-build-side-1-3536488-46558/root/chroot_tmpdir/scmroot/relval'...
$ git fetch origin 0e554046aa9c5fef3e230740418eb0e24d972181:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/relval
 * [new ref]         0e554046aa9c5fef3e230740418eb0e24d972181 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e55404 New release 2.7.5 (don't propose oversize images as Beta blockers)