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This commit adds a hardlink system for the Stargz Snapshotter cache to optimize storage and improve performance. The system intelligently creates hardlinks between identical content chunks, significantly reducing disk space usage in environments with many containers using the same base layers. Key changes: - Add new HardlinkManager that tracks files by chunk digest - Enable hardlinking between chunk files with same content - Add configuration option `EnableHardlink` to control the feature - Preserve file digest mapping across snapshotter restarts - Add documentation on hardlink usage and configuration The implementation includes: - Chunk-level digest tracking for optimizing cache lookups - Background persistence of hardlink mappings to survive restarts - Automatic cleanup of unused digest mappings - Test suite for hardlink functionality Signed-off-by: ChengyuZhu6 <[email protected]>
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