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This PR avoids recompressing module archives restored from the artifact cache when collecting build outputs.
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September 16, 2026 23:28
This PR retains cached archives through hard links by default and adds LAKE_COPY_CACHE_ARCHIVES to explicitly allow copying when hard links fail.
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We've deployed a TauCeti CI workaround: save the verified input-to-archive records before building, then hard-link unchanged archives before stock Lake generates the final mapping with The deployed staging step reused 5,639 archives, then generated the mapping in 4.4s (01:13:50.213–01:13:54.619 UTC). CI, cache publication, and public readback all passed. The workaround's code links here so we can remove it once our pinned Lean includes this fix or something similar. |
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This PR preserves downloaded module archives so
lake build -oreuses them instead of recompressing identical outputs. It also preserves their platform-independence flag.TauCeti’s sandboxed build, step 28, log line 5635 starts
lake build --no-build -o .lake/outputs.jsonlat 07:42:40.943 and finishes at 07:46:33.754: 3m53s. The measured local improvement is 277s to 5.7s, with all 5,455 mappings unchanged.By default, archive retention uses hard links; if unavailable, it skips retention without copying.
LAKE_COPY_CACHE_ARCHIVES=trueexplicitly enables the copy fallback, independently ofrestoreAllArtifacts.Tests cover archive reuse, actual cross-filesystem hard-link failures, copy opt-in, read-only caches, platform-independent mappings, environment propagation, and source-change invalidation.
🤖 prepared with codex