$ git clone -n https://src.fedoraproject.org/rpms/erlang-stdlib2.git /var/lib/mock/f40-build-1817399-24911/root/chroot_tmpdir/scmroot/erlang-stdlib2
Cloning into '/var/lib/mock/f40-build-1817399-24911/root/chroot_tmpdir/scmroot/erlang-stdlib2'...
$ git fetch origin cd5c04caf67007643700c65ccaa7e5cbf55e5260:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-stdlib2
 * [new ref]         cd5c04caf67007643700c65ccaa7e5cbf55e5260 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd5c04c stdlib2 ver. 1.4.6