$ git clone -n https://src.fedoraproject.org/rpms/libvirt.git /var/lib/mock/f41-build-851246-165869/root/chroot_tmpdir/scmroot/libvirt
Cloning into '/var/lib/mock/f41-build-851246-165869/root/chroot_tmpdir/scmroot/libvirt'...
$ git fetch origin c1a7e5f39b48cd7662f79cda1d34f2f06302bf95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvirt
 * [new ref]         c1a7e5f39b48cd7662f79cda1d34f2f06302bf95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1a7e5f rebuild for updated wireshark