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@@ -115,3 +115,29 @@ def updates_vms_status(qvm_collection):
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# "mixed"
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return None
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return status
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+
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+# Helper function that returns a list of all the places a given VM is used in.
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+# Output is a list of tuples (property_holder, property_name), with None as
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+# property_holder for global properties
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+
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+
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+def vm_usage(app, reference_vm):
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+
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+ result = []
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+
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+ global_properties = ['default_dispvm', 'default_netvm',
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+ 'default_template', 'clockvm', 'updatevm']
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+
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+ for prop in global_properties:
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+ if reference_vm == getattr(app, prop, None):
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+ result.append([None, prop])
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+
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+ vm_properties = ['template', 'netvm', 'default_dispvm']
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+
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+ for vm in app.domains:
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+ for prop in vm_properties:
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+ if reference_vm == getattr(vm, prop, None) and \
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+ not vm.property_is_default(prop):
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+ result.append([vm, prop])
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+
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+ return result
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