$ git clone -n https://src.fedoraproject.org/rpms/R-arules.git /var/lib/mock/f42-build-side-1-3585891-46908/root/chroot_tmpdir/scmroot/R-arules
Cloning into '/var/lib/mock/f42-build-side-1-3585891-46908/root/chroot_tmpdir/scmroot/R-arules'...
$ git fetch origin f35b7d0d9b90483470db47cf0e4f62a350e9894d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-arules
 * [new ref]         f35b7d0d9b90483470db47cf0e4f62a350e9894d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f35b7d0 Update to 1.7.11