$ git clone -n https://src.fedoraproject.org/rpms/R-RM2.git /var/lib/mock/f41-build-side-1-3142776-40009/root/chroot_tmpdir/scmroot/R-RM2
Cloning into '/var/lib/mock/f41-build-side-1-3142776-40009/root/chroot_tmpdir/scmroot/R-RM2'...
$ git fetch origin 62d315d18e531516df766e0f1fdafe01446e2f91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RM2
 * [new ref]         62d315d18e531516df766e0f1fdafe01446e2f91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62d315d convert GPLv3+ license to SPDX