$ git clone -n https://src.fedoraproject.org/rpms/python-formencode.git /var/lib/mock/f45-build-30764-647/root/chroot_tmpdir/scmroot/python-formencode
Cloning into '/var/lib/mock/f45-build-30764-647/root/chroot_tmpdir/scmroot/python-formencode'...
$ git fetch origin 684371f6af594a91cc86912c264a611a6d9a442b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-formencode
 * [new ref]         684371f6af594a91cc86912c264a611a6d9a442b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 684371f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild