Revision fc31fadd lib/cmdlib.py

b/lib/cmdlib.py
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      if self.op.os_type is None:
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        raise errors.OpPrereqError("No guest OS specified",
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                                   errors.ECODE_INVAL)
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      if self.op.os_type in self.cfg.GetClusterInfo().blacklisted_oss:
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        raise errors.OpPrereqError("Guest OS '%s' is not allowed for"
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                                   " installation" % self.op.os_type,
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                                   errors.ECODE_STATE)
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      if self.op.disk_template is None:
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        raise errors.OpPrereqError("No disk template specified",
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                                   errors.ECODE_INVAL)

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