$ git clone -n https://src.fedoraproject.org/rpms/scapy.git /var/lib/mock/f40-build-2170747-51031/root/chroot_tmpdir/scmroot/scapy
Cloning into '/var/lib/mock/f40-build-2170747-51031/root/chroot_tmpdir/scmroot/scapy'...
$ git fetch origin faf4b7aa8ba25b825450067f08795f319ba22b53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/scapy
 * [new ref]         faf4b7aa8ba25b825450067f08795f319ba22b53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at faf4b7a cosmetics