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Here we replace uses of the pyyaml module directly with functions
provided by cloudinit.safeyaml. Also, change/move
cloudinit.util.yaml_dumps
to
cloudinit.safeyaml.dumps
LP: #1849640
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Cloud-init rendered netplan with duplicate aliases if a network config
included "global" nameserver/search values. Netplan uses can read yaml
files which do use aliaes but cloud-init did not render a single yaml
dictionary, instead it combined yaml sections into a single document
which sometimes resulted in duplicate aliases being present.
This branch introduces a yaml SafeDumper class which can set the
'ignore_aliases' attribute. This is not enabled by default but callers
to util.yaml_dumps can pass a boolean to toggle this. The netplan
render uses noalias=True and the resulting yaml output does not contain
any aliases.
LP: #1815051
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This has been a recurring ask and we had initially just made the change to
the cloud-init 2.0 codebase. As the current thinking is we'll just
continue to enhance the current codebase, its desirable to relicense to
match what we'd intended as part of the 2.0 plan here.
- put a brief description of license in LICENSE file
- put full license versions in LICENSE-GPLv3 and LICENSE-Apache2.0
- simplify the per-file header to reference LICENSE
- tox: ignore H102 (Apache License Header check)
Add license header to files that ship.
Reformat headers, make sure everything has vi: at end of file.
Non-shipping files do not need the copyright header,
but at the moment tests/ have it.
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pycodestyle 2.1.0 is in Ubuntu zesty, and complained about the
changes made here. Simple style changes. This makes 'make pep8'
pass again when built in a zesty build system with proposed enabled.
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In 0.7.0 we started using yaml.safe_load to load data rather than
yaml.load. Some producers (namely, ubuntu MAAS created) have produced
cloud-config data in the past that included python unicode types.
This creates a specialized safe_loader that is basically safe_load +
support for python unicode.
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