$ git clone -n https://src.fedoraproject.org/rpms/toolbox.git /var/lib/mock/f42-build-side-1-3536719-46558/root/chroot_tmpdir/scmroot/toolbox
Cloning into '/var/lib/mock/f42-build-side-1-3536719-46558/root/chroot_tmpdir/scmroot/toolbox'...
$ git fetch origin a3506a3263d8003ac1803ac7b48876ec40cb4f82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toolbox
 * [new ref]         a3506a3263d8003ac1803ac7b48876ec40cb4f82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3506a3 Update to 0.1.2