$ git clone -n https://src.fedoraproject.org/rpms/python-xmlschema.git /var/lib/mock/f41-build-733077-13198/root/chroot_tmpdir/scmroot/python-xmlschema
Cloning into '/var/lib/mock/f41-build-733077-13198/root/chroot_tmpdir/scmroot/python-xmlschema'...
$ git fetch origin b42381ffea40e5d6277ebc6c771f2d86058c739f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-xmlschema
 * [new ref]         b42381ffea40e5d6277ebc6c771f2d86058c739f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b42381f Rebase to 3.2.1