ci: cache cargo registry and target dir with Swatinem/rust-cache#142
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mazurroman wants to merge 1 commit into
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ci: cache cargo registry and target dir with Swatinem/rust-cache#142mazurroman wants to merge 1 commit into
mazurroman wants to merge 1 commit into
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All three CI jobs currently rebuild every dependency from scratch on every run, which dominates CI time. Add Swatinem/rust-cache@v2 right after each Rust toolchain install so the cargo registry, git index, and target directory are restored from the per-job cache. The action keys the cache off Cargo.lock + toolchain by default, so: - cache hits skip the dependency compile entirely - Cargo.lock or toolchain changes invalidate cleanly - per-job key isolation means the rust/lit/coverage jobs each get the cache layout that matches their build profile Drop-in change: no scripts modified, no flags changed. Cold-cache runs behave the same; subsequent runs should drop from minutes of dep compile to seconds of restore.
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Summary
All three CI jobs (
rust,lit,coverage) currently rebuild every dependency from scratch on every run, which dominates CI time. Thecoveragejob also recompilescargo-llvm-covitself every time.Add
Swatinem/rust-cache@v2right after each Rust toolchain install so the cargo registry, git index, andtarget/directory are restored from a per-job cache.The action keys the cache off
Cargo.lock+ toolchain by default, so:Cargo.lockor toolchain changes invalidate cleanlyrust/lit/coveragejobs each get a cache layout that matches their build profileTest plan
mainbefore a cache exists) behave the same as before; subsequent runs benefit from cached deps.rust-cacheruns, which is the action's required ordering.