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When a client's hardware presents an empty memory bank and invalid call
to _bytes_to_human is performed because None is passed as a parameter.
size = _bytes_to_human(obj.get('size', None))
Fix this by checking if 'size' is present in the JSON output from lshw.
If size is present then map the bytes to a human readable string using
_bytes_to_human, if no size is present then use 'Empty slot' to indicate
that the memory bank is not being used.
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The first stage of parsing the "lshw -json" command output is to load
the json string into a Python dictionary. lshw output is large and
varies from machine to machine, so it's not safe to assume that
different keys will be present in the dictionary.
Use dict.get() instead of dict[key] to avoid KeyError exceptions.
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hw_inventory.py defines classes and helpers functions enabling
fetching of hardware inventory from a running client.
Uses a subprocess call to the command 'lshw -json' to obtain hardware
information.
Relevant public functions:
> get_hardware_inventory()
Main function encapsulating subprocess and output processing
logic.
Returns a HardwareInventory object.
> legacy_list_hardware_inventory(inventory)
Legacy string representation of parameter HardwareInventory object
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