$ git clone -n https://src.fedoraproject.org/rpms/retroarch.git /var/lib/mock/f39-build-1581236-38084/root/chroot_tmpdir/scmroot/retroarch
Cloning into '/var/lib/mock/f39-build-1581236-38084/root/chroot_tmpdir/scmroot/retroarch'...
$ git fetch origin 664693146827ee1cc7708c76290f615f705f028c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/retroarch
 * [new ref]         664693146827ee1cc7708c76290f615f705f028c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6646931 license: Convert to SPDX