$ git clone -n https://src.fedoraproject.org/rpms/libqalculate.git /var/lib/mock/f40-build-2008170-45344/root/chroot_tmpdir/scmroot/libqalculate
Cloning into '/var/lib/mock/f40-build-2008170-45344/root/chroot_tmpdir/scmroot/libqalculate'...
$ git fetch origin b967ff7b888750bbf835c74b714450cf67fb9e5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libqalculate
 * [new ref]         b967ff7b888750bbf835c74b714450cf67fb9e5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b967ff7 Update to v4.8.1