$ git clone -n https://src.fedoraproject.org/rpms/libvirt.git /var/lib/mock/f42-build-874570-178943/root/chroot_tmpdir/scmroot/libvirt
Cloning into '/var/lib/mock/f42-build-874570-178943/root/chroot_tmpdir/scmroot/libvirt'...
$ git fetch origin 63cd2ced206d91a527075b01475eb67b17f83fcf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvirt
 * [new ref]         63cd2ced206d91a527075b01475eb67b17f83fcf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63cd2ce Update to version 11.0.0