$ git clone -n https://src.fedoraproject.org/rpms/R-nycflights13 /var/lib/mock/f41-build-side-1-3148755-40083/root/chroot_tmpdir/scmroot/R-nycflights13
Cloning into '/var/lib/mock/f41-build-side-1-3148755-40083/root/chroot_tmpdir/scmroot/R-nycflights13'...
$ git fetch origin 821635525457f1ff791c8cc718e522be15412ad7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-nycflights13
 * [new ref]         821635525457f1ff791c8cc718e522be15412ad7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8216355 convert license to SPDX