$ git clone -n https://src.fedoraproject.org/rpms/erlang-riak_core.git /var/lib/mock/f41-build-side-1-3102819-39354/root/chroot_tmpdir/scmroot/erlang-riak_core
Cloning into '/var/lib/mock/f41-build-side-1-3102819-39354/root/chroot_tmpdir/scmroot/erlang-riak_core'...
$ git fetch origin 40409cf6dc03c8c2f90938f0469bd614b1450874:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-riak_core
 * [new ref]         40409cf6dc03c8c2f90938f0469bd614b1450874 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40409cf Long-waited upgrade to 3.x.y