Revision 0ea86154

b/lib/cmdlib.py
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    assert self.instance is not None, \
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      "Cannot retrieve locked instance %s" % self.op.instance_name
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    if instance.disk_template not in constants.DTS_COPYABLE:
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      raise errors.OpPrereqError("Disk template %s not suitable for copying" %
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                                 instance.disk_template, errors.ECODE_STATE)
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    node = self.cfg.GetNodeInfo(self.op.target_node)
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    assert node is not None, \
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      "Cannot retrieve locked node %s" % self.op.target_node

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