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__init__.py	0 B	-rw-r--r--	2022-11-23 21:17
apport.py	5.74 KB	-rw-r--r--	2022-11-23 21:17
atomic_helper.py	1.38 KB	-rw-r--r--	2022-11-23 21:17
cloud.py	3.49 KB	-rw-r--r--	2022-11-23 21:17
dhclient_hook.py	2.49 KB	-rw-r--r--	2022-11-23 21:17
dmi.py	6 KB	-rw-r--r--	2022-11-23 21:17
event.py	2.05 KB	-rw-r--r--	2022-11-23 21:17
features.py	2.33 KB	-rw-r--r--	2022-11-23 21:17
gpg.py	4.32 KB	-rw-r--r--	2022-11-23 21:17
helpers.py	16.43 KB	-rw-r--r--	2022-11-23 21:17
importer.py	1.75 KB	-rw-r--r--	2022-11-23 21:17
log.py	4.33 KB	-rw-r--r--	2022-11-23 21:17
netinfo.py	22.57 KB	-rw-r--r--	2022-11-23 21:17
patcher.py	1.1 KB	-rw-r--r--	2022-11-23 21:17
persistence.py	2.54 KB	-rw-r--r--	2022-11-23 21:17
registry.py	1.02 KB	-rw-r--r--	2022-11-23 21:17
safeyaml.py	5.84 KB	-rw-r--r--	2022-11-23 21:17
settings.py	1.99 KB	-rw-r--r--	2022-11-23 21:17
signal_handler.py	1.78 KB	-rw-r--r--	2022-11-23 21:17
simpletable.py	1.93 KB	-rw-r--r--	2022-11-23 21:17
ssh_util.py	20.16 KB	-rw-r--r--	2022-11-23 21:17
stages.py	34.31 KB	-rw-r--r--	2022-11-23 21:17
subp.py	13.24 KB	-rw-r--r--	2022-11-23 21:17
temp_utils.py	3.19 KB	-rw-r--r--	2022-11-23 21:17
templater.py	5.83 KB	-rw-r--r--	2022-11-23 21:17
type_utils.py	726 B	-rw-r--r--	2022-11-23 21:17
url_helper.py	27.92 KB	-rw-r--r--	2022-11-23 21:17
user_data.py	14.49 KB	-rw-r--r--	2022-11-23 21:17
util.py	88.21 KB	-rw-r--r--	2022-11-23 21:17
version.py	588 B	-rw-r--r--	2022-11-23 21:17
warnings.py	3.84 KB	-rw-r--r--	2022-11-23 21:17

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.
        """

# vi: ts=4 expandtab