Backup luke #4531
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Backup luke #4531
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Previously, OS based on native containers could not retrieve the manifest difference between the current system container image and its corresponding remote container image without performing an actual upgrade. This PR solves this issue by allowing the manifest difference to be outputted when using the `rpm-ostree upgrade --check` command. A `ManifestDiff` struct needed to be retrieved using `ostree-rs-ext`, requring several new functions in both Rust and C that were bridged through CXX Bridge. The `cached_update` object also needed to be modifed and updated with the `ManifestDiff` in order to extend compatibility with other products using rpm-ostree. However, a notable difference between how the `--upgrade --check` function works for ostree based system and a native container based system is that native containers skip over the use of `checksums`. This is because rebasing to locally stored container images (as opposed to a remote repository) does not create a valid ostree refspec. A Rust unit test was implemented to confirm that a difference between two manifests (stored locally in the rust/test folder) can be successfully retrieved. A `kola` test was also implemented to confirm that running `rpm-ostree upgrade --check` returns the correct manifest difference for a potential upgrade.
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Thank you for contributing to rpm-ostree.
If you are adding functionality to tree composes, please add
a corresponding test to the compose-test suite. Similarly,
if adding a client-facing feature, consider the vmcheck
suite. Regressions fixes are also great candidates for new
tests.
If you're not sure where or how to add tests, don't hesitate
to ask for help from the maintainers.
Cheers!