$ git clone -n https://src.fedoraproject.org/forks/u2fsdgvkx1/rpms/redhat-rpm-config.git /var/lib/mock/f45-build-338-191/root/chroot_tmpdir/scmroot/redhat-rpm-config
Cloning into '/var/lib/mock/f45-build-338-191/root/chroot_tmpdir/scmroot/redhat-rpm-config'...
$ git fetch origin 071dca2d0fe99fdc548494e9b6440ac587ace5b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/u2fsdgvkx1/rpms/redhat-rpm-config
 * [new ref]         071dca2d0fe99fdc548494e9b6440ac587ace5b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 071dca2 add RVA23 support