$ git clone -n https://src.fedoraproject.org/rpms/R-RcppDate.git /var/lib/mock/f41-build-side-1-3141186-39987/root/chroot_tmpdir/scmroot/R-RcppDate
Cloning into '/var/lib/mock/f41-build-side-1-3141186-39987/root/chroot_tmpdir/scmroot/R-RcppDate'...
$ git fetch origin aacde577fbf66f9d1a759efca082340fe89a9c9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RcppDate
 * [new ref]         aacde577fbf66f9d1a759efca082340fe89a9c9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aacde57 convert GPLv2+ license to SPDX