$ git clone -n https://src.fedoraproject.org/rpms/tcpreplay.git /var/lib/mock/f45-build-36925-709/root/chroot_tmpdir/scmroot/tcpreplay
Cloning into '/var/lib/mock/f45-build-36925-709/root/chroot_tmpdir/scmroot/tcpreplay'...
$ git fetch origin ac623c49bf4013eb61bee48f4e0bd84d190f383c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcpreplay
 * [new ref]         ac623c49bf4013eb61bee48f4e0bd84d190f383c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac623c4 Update to 4.6.1