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This class holds the parsed state of a BSD network interface.
It is itself side-effect free.
All methods with side-effects should be implemented on one of the
``BSDNetworking`` classes.
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A parser for BSD style ``ifconfig(8)`` output.
For documentation here:
- https://man.freebsd.org/ifconfig(8)
- https://man.netbsd.org/ifconfig.8
- https://man.openbsd.org/ifconfig.8
All output is considered equally, and then massaged into a singular form:
an ``Ifstate`` object.
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Parse the ``ifconfig -a`` output ``text``, into a dict of ``Ifstate``
objects, referenced by ``name`` *and* by ``mac`` address.
This dict will always be the same, given the same input, so we can
``@lru_cache()`` it. n.b.: ``@lru_cache()`` takes only the
``__hash__()`` of the input (``text``), so it should be fairly quick,
despite our giant inputs.
@param text: The output of ``ifconfig -a``
@returns: A dict of ``Ifstate``s, referenced by ``name`` and ``mac``
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