[tox] Use generating environments Drop the "env" option, which is unknown, and set a generative_ "envlist". Then use conditional dependencies based on factors_ to avoid repeating environment sections. The only singular one is the "cubicweb" environment because of its "commands". At some point, it'd be nice to find a way to have python version prefixes (py27-hooks or py34-web) for environment names but I could not find a way to extract the package name from such names. .. _generative: http://tox.readthedocs.org/en/latest/config.html#generative-envlist .. _factors: http://tox.readthedocs.org/en/latest/config.html#factors-and-factor-conditional-settings

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import ConfigParser

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try:

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    undo_actions = config.cfgfile_parser.get('MAIN', 'undo-support', False)

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except ConfigParser.NoOptionError:

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    pass # this conf. file was probably already migrated

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else:

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    config.global_set_option('undo-enabled', bool(undo_actions))