Comment 2 for bug 1677730

This is my mapping.json file:
[
    {
        "local": [
            {
                "user": {
                    "name": "{0}",
                    "domain": {
                        "id": "default"
                    },
                    "type": "local"
                },
            }
        ],
        "remote": [
            {
                "type": "uid"
            }
        ]
    }
]

This is the test.txt input file:
uid: abc

Then simply running:
keystone-manage mapping_engine --rules mapping.json --input test.txt

The error I posted earlier only shows up in /var/log/keystone/keystone.log