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The `--config-file` option defaults to the value of
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`MAAS_PROVISIONING_SETTINGS` in the process's environment, or absent
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def __init__(self, description):
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# Avoid circular imports.
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super(MainScript, self).__init__(description)
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self.parser.add_argument(
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"-c", "--config-file", metavar="FILENAME",
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help="Configuration file to load [%(default)s].",