$ git clone -n https://src.fedoraproject.org/rpms/uhd.git /var/lib/mock/f40-build-2044065-48683/root/chroot_tmpdir/scmroot/uhd
Cloning into '/var/lib/mock/f40-build-2044065-48683/root/chroot_tmpdir/scmroot/uhd'...
$ git fetch origin a51621a3f95b68adfd3ffd2bc9184cea91878b7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/uhd
 * [new ref]         a51621a3f95b68adfd3ffd2bc9184cea91878b7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a51621a New version