{
    "signed": {
            "_type": "link",
            "name": "",
            "materials": {},
            "products": {
                "tests/test_link/foo.tar.gz": {
                    "sha256": "52947cb78b91ad01fe81cd6aef42d1f6817e92b9e6936c1e5aabb7c98514f355"
                }
            },
            "byproducts": {
                "return-value": 0,
                "stderr": "a foo.py\n",
                "stdout": ""
            },
            "command": ["tar", "zcvf", "foo.tar.gz", "foo.py"],
            "environment": null
        }, 
    "signatures": []
}