Implement two new storage backends for the io.Medium interface:
- pkg/io/s3: S3-backed Medium using AWS SDK v2 with interface-based
mocking for tests. Supports prefix-based namespacing via WithPrefix
option. All 18 Medium methods implemented with proper S3 semantics
(e.g. EnsureDir is no-op, IsDir checks prefix existence).
- pkg/io/sqlite: SQLite-backed Medium using modernc.org/sqlite (pure Go,
no CGo). Uses a single table schema with path, content, mode, is_dir,
and mtime columns. Supports custom table names via WithTable option.
All tests use :memory: databases.
Both packages include comprehensive test suites following the _Good/_Bad/_Ugly
naming convention with 87 tests total (36 S3, 51 SQLite).
Co-authored-by: Claude <developers@lethean.io>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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