fix(ci): stop restoring read-only rustc metadata caches - #1120
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ScriptedAlchemy merged 1 commit intoSep 9, 2026
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Prefix-restored v0-rust blobs leave rustc's 0444 .rmeta files in target/; hosted slice-tests and hotpath lanes then fail the rewrite. Isolate those lanes on v1-rust and drop target/ unless the hit is exact.
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ScriptedAlchemy
merged commit Sep 9, 2026
c92de74
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codex/tracedecay-total-redesign-plan-reopened
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Root cause
Swatinem/rust-cache prefix-restored compiler trees from another lockfile generation. rustc writes
.rmetamode 0444 and then failed trying to update those restored files, so slice-tests and Hotpath lanes never executed.Fix
v1-rustshared keystarget/after a prefix restore; preserve registry/download cachetarget-basefor the profile baseline buildNo chmod workaround, skipped lane, or Rust source change.
Tests
The first hosted run is intentionally cold and seeds v1; subsequent exact hits retain dependency artifacts.