$ git clone -n https://src.fedoraproject.org/rpms/riemann-c-client.git /var/lib/mock/f41-build-746221-13353/root/chroot_tmpdir/scmroot/riemann-c-client
Cloning into '/var/lib/mock/f41-build-746221-13353/root/chroot_tmpdir/scmroot/riemann-c-client'...
$ git fetch origin 4555071c32abb0578671bd6928e9fc7849f2922e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/riemann-c-client
 * [new ref]         4555071c32abb0578671bd6928e9fc7849f2922e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4555071 Eliminate use of obsolete %patchN syntax (#2283636)