$ git clone -n https://src.fedoraproject.org/rpms/quaternion.git /var/lib/mock/f40-build-2189298-51404/root/chroot_tmpdir/scmroot/quaternion
Cloning into '/var/lib/mock/f40-build-2189298-51404/root/chroot_tmpdir/scmroot/quaternion'...
$ git fetch origin 3580feaa4fcab82334b5f506ef1bbaee5013427b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/quaternion
 * [new ref]         3580feaa4fcab82334b5f506ef1bbaee5013427b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3580fea Remove explicit dependency