$ git clone -n https://src.fedoraproject.org/rpms/R-sysfonts /var/lib/mock/f41-build-side-1-3149113-40244/root/chroot_tmpdir/scmroot/R-sysfonts
Cloning into '/var/lib/mock/f41-build-side-1-3149113-40244/root/chroot_tmpdir/scmroot/R-sysfonts'...
$ git fetch origin 6fc8e120f99cec8d883d5f52062dce04ec30c49c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sysfonts
 * [new ref]         6fc8e120f99cec8d883d5f52062dce04ec30c49c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fc8e12 convert GPLv2 license to SPDX