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__init__.py	0 B	-rw-r--r--	2023-12-04 11:47
apport.py	7.05 KB	-rw-r--r--	2023-12-04 11:47
atomic_helper.py	2.45 KB	-rw-r--r--	2023-12-04 11:47
cloud.py	3.22 KB	-rw-r--r--	2023-12-04 11:47
dmi.py	6.77 KB	-rw-r--r--	2023-12-04 11:47
event.py	2 KB	-rw-r--r--	2023-12-04 11:47
features.py	3.38 KB	-rw-r--r--	2023-12-04 11:47
gpg.py	4.28 KB	-rw-r--r--	2023-12-04 11:47
helpers.py	16.41 KB	-rw-r--r--	2023-12-04 11:47
importer.py	2.43 KB	-rw-r--r--	2023-12-04 11:47
log.py	5.47 KB	-rw-r--r--	2023-12-04 11:47
netinfo.py	22.97 KB	-rw-r--r--	2023-12-04 11:47
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signal_handler.py	1.74 KB	-rw-r--r--	2023-12-04 11:47
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ssh_util.py	22.28 KB	-rw-r--r--	2026-05-28 15:47
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subp.py	13.23 KB	-rw-r--r--	2023-12-04 11:47
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templater.py	5.95 KB	-rw-r--r--	2023-12-04 11:47
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util.py	96.43 KB	-rw-r--r--	2023-12-04 11:47
version.py	566 B	-rw-r--r--	2026-05-28 15:47
warnings.py	3.76 KB	-rw-r--r--	2023-12-04 11:47

Rename

# Copyright (C) 2020 Canonical Ltd.
#
# Author: Daniel Watkins <oddbloke@ubuntu.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

class CloudInitPickleMixin:
    """Scaffolding for versioning of pickles.

This class implements ``__getstate__`` and ``__setstate__`` to provide
    lightweight versioning of the pickles that are generated for classes which
    use it.  Versioning is done at the class level.

The current version of a class's pickle should be set in the class variable
    ``_ci_pkl_version``, as an int.  If not overriden, it will default to 0.

On unpickle, the object's state will be restored and then
    ``self._unpickle`` is called with the version of the stored pickle as the
    only argument: this is where classes should implement any deserialization
    fixes they require.  (If the stored pickle has no version, 0 is passed.)
    """

_ci_pkl_version = 0

def __getstate__(self):
        """Persist instance state, adding a pickle version attribute.

This adds a ``_ci_pkl_version`` attribute to ``self.__dict__`` and
        returns that for serialisation.  The attribute is stripped out in
        ``__setstate__`` on unpickle.

The value of ``_ci_pkl_version`` is ``type(self)._ci_pkl_version``.
        """
        state = self.__dict__.copy()
        state["_ci_pkl_version"] = type(self)._ci_pkl_version
        return state

def __setstate__(self, state: dict) -> None:
        """Restore instance state and handle missing attributes on upgrade.

This will be called when an instance of this class is unpickled; the
        previous instance's ``__dict__`` is passed as ``state``.  This method
        removes the pickle version from the stored state, restores the
        remaining state into the current instance, and then calls
        ``self._unpickle`` with the version (or 0, if no version is found in
        the stored state).

See https://docs.python.org/3/library/pickle.html#object.__setstate__
        for further background.
        """
        version = state.pop("_ci_pkl_version", 0)
        self.__dict__.update(state)
        self._unpickle(version)

def _unpickle(self, ci_pkl_version: int) -> None:
        """Perform any deserialization fixes required.

By default, this does nothing.  Classes using this mixin should
        override this method if they have fixes they need to apply.

``ci_pkl_version`` will be the version stored in the pickle for this
        object, or 0 if no version is present.
        """