$ git clone -n https://src.fedoraproject.org/rpms/qalculate-qt.git /var/lib/mock/f39-build-1739941-41342/root/chroot_tmpdir/scmroot/qalculate-qt
Cloning into '/var/lib/mock/f39-build-1739941-41342/root/chroot_tmpdir/scmroot/qalculate-qt'...
$ git fetch origin ad9df4caa8aba544a6b0a99e27546bf18109f2a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qalculate-qt
 * [new ref]         ad9df4caa8aba544a6b0a99e27546bf18109f2a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad9df4c Update to 4.8.1 (close RHBZ#2239460)