$ git clone -n https://src.fedoraproject.org/rpms/rubberband.git /var/lib/mock/f42-build-3356246-45027/root/chroot_tmpdir/scmroot/rubberband
Cloning into '/var/lib/mock/f42-build-3356246-45027/root/chroot_tmpdir/scmroot/rubberband'...
$ git fetch origin ce93d41ee871a600b5f8ae3496a5f1f4b0e39ecc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubberband
 * [new ref]         ce93d41ee871a600b5f8ae3496a5f1f4b0e39ecc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce93d41 Separate components into subpackages