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config	[ DIR ]	drwxr-xr-x
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sources	[ DIR ]	drwxr-xr-x
__init__.py	0 B	-rw-r--r--
apport.py	8.3 KB	-rw-r--r--
atomic_helper.py	2.79 KB	-rw-r--r--
cloud.py	3.22 KB	-rw-r--r--
dmi.py	7.81 KB	-rw-r--r--
event.py	2 KB	-rw-r--r--
features.py	5.28 KB	-rw-r--r--
gpg.py	7.99 KB	-rw-r--r--
helpers.py	16.16 KB	-rw-r--r--
importer.py	2.43 KB	-rw-r--r--
lifecycle.py	7.79 KB	-rw-r--r--
netinfo.py	24.07 KB	-rw-r--r--
performance.py	3.1 KB	-rw-r--r--
persistence.py	2.52 KB	-rw-r--r--
registry.py	1022 B	-rw-r--r--
safeyaml.py	10.11 KB	-rw-r--r--
settings.py	2.12 KB	-rw-r--r--
signal_handler.py	3.92 KB	-rw-r--r--
simpletable.py	1.93 KB	-rw-r--r--
socket.py	5.93 KB	-rw-r--r--
ssh_util.py	22.21 KB	-rw-r--r--
stages.py	41.53 KB	-rw-r--r--
subp.py	12.43 KB	-rw-r--r--
temp_utils.py	2.94 KB	-rw-r--r--
templater.py	7.74 KB	-rw-r--r--
type_utils.py	703 B	-rw-r--r--
url_helper.py	38.15 KB	-rw-r--r--
user_data.py	14.44 KB	-rw-r--r--
util.py	90.38 KB	-rw-r--r--
version.py	568 B	-rw-r--r--
warnings.py	3.76 KB	-rw-r--r--

Code Editor : persistence.py

# 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 overridden, 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.
        """

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Code Editor : persistence.py