$ git clone -n https://src.fedoraproject.org/rpms/R2spec.git /var/lib/mock/f41-build-side-2-python-2707790-30463/root/chroot_tmpdir/scmroot/R2spec
Cloning into '/var/lib/mock/f41-build-side-2-python-2707790-30463/root/chroot_tmpdir/scmroot/R2spec'...
$ git fetch origin 804fbfe6f89e675e896d3b63e9eca91a7f08dff5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R2spec
 * [new ref]         804fbfe6f89e675e896d3b63e9eca91a7f08dff5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 804fbfe convert GPLv3+ license to SPDX