$ git clone -n https://src.fedoraproject.org/rpms/CubicSDR.git /var/lib/mock/f41-build-side-1-3125246-39494/root/chroot_tmpdir/scmroot/CubicSDR
Cloning into '/var/lib/mock/f41-build-side-1-3125246-39494/root/chroot_tmpdir/scmroot/CubicSDR'...
$ git fetch origin 06fdc6cb5c17c9a6d176705d5e78120b645b6a7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/CubicSDR
 * [new ref]         06fdc6cb5c17c9a6d176705d5e78120b645b6a7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06fdc6c Rebuild for liquid-dsp-1.6.0 now that it's in the repos.