$ git clone -n https://src.fedoraproject.org/rpms/python-sphinx-theme-builder.git /var/lib/mock/f41-build-1019140-17964/root/chroot_tmpdir/scmroot/python-sphinx-theme-builder
Cloning into '/var/lib/mock/f41-build-1019140-17964/root/chroot_tmpdir/scmroot/python-sphinx-theme-builder'...
$ git fetch origin 6c54c4b9b23fd56c63790798e72790f338df0137:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-sphinx-theme-builder
 * [new ref]         6c54c4b9b23fd56c63790798e72790f338df0137 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c54c4b Build in non-bootstrap mode