Revision 2ed0e208 lib/config.py

b/lib/config.py
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    if target is None:
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      if len(self._config_data.nodegroups) != 1:
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        raise errors.OpPrereqError("More than one node group exists. Target"
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                                   " group must be specified explicitely.")
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                                   " group must be specified explicitly.")
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      else:
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        return self._config_data.nodegroups.keys()[0]
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    if target in self._config_data.nodegroups:

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