$ git clone -n https://src.fedoraproject.org/rpms/uhd.git /var/lib/mock/f40-build-2261230-54430/root/chroot_tmpdir/scmroot/uhd
Cloning into '/var/lib/mock/f40-build-2261230-54430/root/chroot_tmpdir/scmroot/uhd'...
$ git fetch origin 85558aa0e55af45a93bd31b8ec8483479b0bbd91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/uhd
 * [new ref]         85558aa0e55af45a93bd31b8ec8483479b0bbd91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85558aa Rebuilt for Boost 1.83