$ git clone -n https://src.fedoraproject.org/rpms/erlang-webmachine.git /var/lib/mock/f42-build-side-1-3508102-46013/root/chroot_tmpdir/scmroot/erlang-webmachine
Cloning into '/var/lib/mock/f42-build-side-1-3508102-46013/root/chroot_tmpdir/scmroot/erlang-webmachine'...
$ git fetch origin 08f1a05285a053166de38f5a2321addf096f64fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-webmachine
 * [new ref]         08f1a05285a053166de38f5a2321addf096f64fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08f1a05 Webmachine 1.12.0