Add deterministic tar and gzip utilities for OCI skills#22
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Add reproducible archive creation and extraction utilities to the oci/skills package. These are foundational for the skill packager. tar.go: Deterministic tar creation with sorted entries, normalized headers (UID/GID=0, PAX format, epoch-based timestamps). Extraction rejects symlinks, hardlinks, device entries, and path traversal. Per-file size limit (100MB) prevents decompression bombs. gzip.go: Deterministic gzip compression with fixed headers (OS=255, empty name/comment, BestCompression). Decompression with size limit (100MB) prevents decompression bombs. Convenience CompressTar and DecompressTar for combined tar.gz operations. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
rdimitrov
approved these changes
Feb 6, 2026
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Summary
tar.go: reproducible tar creation with sorted entries, normalized headers (UID/GID=0, PAX format, epoch timestamps). Extraction rejects symlinks, hardlinks, device entries, and path traversal. Per-file size limit (100MB)gzip.go: reproducible gzip with fixed headers (OS=255, empty name/comment, BestCompression). Decompression with size limit (100MB). ConvenienceCompressTar/DecompressTarhelpersThese are foundational utilities for the skill packager (next PR). No new dependencies added.
Part of #16
Test plan
taskpasses (lint + test)task license-checkpasses🤖 Generated with Claude Code