$ git clone -n https://src.fedoraproject.org/rpms/toolbox.git /var/lib/mock/f42-build-867072-174622/root/chroot_tmpdir/scmroot/toolbox
Cloning into '/var/lib/mock/f42-build-867072-174622/root/chroot_tmpdir/scmroot/toolbox'...
$ git fetch origin 8ec06e58caef451a542c5c70684af9c2dfddcc8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toolbox
 * [new ref]         8ec06e58caef451a542c5c70684af9c2dfddcc8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ec06e5 Update to 0.1.1