BAR-113: Add --min-chunk-size option to barman-cloud-backup #849
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mikewallace1979
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Sep 27, 2023
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Not quite sure how I managed to add this to the PR - it wasn't intentional.
Adds a new option, `--min-chunk-size`, to `barman-cloud-backup`. If set then this will be used when setting the minimum size of an upload chunk in a multipart upload. The only guarantee Barman offers here is that the upload chunk size will be greater than this value - the actual chunk size used will be whichver is greatest of: `--min-chunk-size`, the `MIN_CHUNK_SIZE` for the cloud provider, or the calculated chunk size based on the `max_archive_size` and the `MAX_CHUNKS_PER_FILE` property of the cloud interface. This can be used to ensure uploaded chunks are not smaller than the specified value. Relates to BAR-113.
Rather than test the `--min-chunk-size` against the calculated chunk size in one place and then test the result against the cloud interface `MIN_CHUNK_SIZE` in another, we peform all `chunk_size` setting checks in the `CloudUploadController` and update `CloudTarUploader` so that it is just given the chunk size by the upload controller. Relates to BAR-113.
Updates the unit tests for the `CloudBackupUploader` creation such that they validate that both `--max-archive-size` and the new `--min-chunk-size` options are passed to the `CloudBackupUploader`. Relates to BAR-113.
Update tests so that chunk_size is now passed to CloudTarUploader instead of being read from the cloud interface. Relates to BAR-113.
Adds tests for ClourUploadController which verify that it computes the correct max_archive_size and chunk_size given the supplied arguments and cloud interface properties. Relates to BAR-113.
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