$ git clone -n https://src.fedoraproject.org/rpms/gammaray.git /var/lib/mock/f40-build-801709-143851/root/chroot_tmpdir/scmroot/gammaray
Cloning into '/var/lib/mock/f40-build-801709-143851/root/chroot_tmpdir/scmroot/gammaray'...
$ git fetch origin 3eef90298d048c49826c169245a144f27db213ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gammaray
 * [new ref]         3eef90298d048c49826c169245a144f27db213ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3eef902 Rebuild (qt5)