ci(ix): reuse the shared R2 sccache - #4558
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The ix preview passed no secrets to its Rust jobs. The bet was that the
seed disk would carry target/, but the platform refuses to restore those
seeds ("snapshot has no captured block-volume root; not warm-restorable"),
so every ix machine boots cold and compiles the workspace from scratch:
1187 of 1216 units dirty, 0.25% sccache hits, 1218s for a build step the
hosted lane finishes in 90s at 99.9% hits. The cold builds then overrun
the 40 minute msrv ceiling and starve the timing-sensitive tests.
Pass BAML_SCCACHE_R2_* through to the cargo-tests and size-gate calls.
Both reusable workflows already declare the secrets and .envrc already
switches to R2 when they are set, so nothing else changes. PR code runs
on these machines; swap the secret names for a read-only R2 token once
one exists.
Pin NEXTEST_TEST_THREADS and RUST_TEST_THREADS to 16 across the workflow.
An ix guest reports 100 CPUs, so nextest ran 100 test threads per job
across 22 concurrent machines; bex_engine's cancellation tests assert
sub-2s wall clock and the snapshot suite's loopback mock servers timed
out under that load. The SDK matrix keeps its own 32.
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe ix CI reusable jobs now forward R2 sccache credentials directly. GitHub repository-secret restrictions determine credential availability for repository, fork, and Dependabot pull requests. Changesix CI workflow execution
Estimated code review effort: 3 (Moderate) | ~15–30 minutes Merge Risk: ⚪ Minimal · up to This PR enables shared R2 caching for eligible CI runs while preserving local caching for fork and Dependabot runs; no actionable merge-blocking risk remains after normal checks and review. Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In @.github/workflows/ix-ci.yml:
- Around line 119-124: Update the ix workflow’s secret-passing logic for the
reusable ix-cargo-tests workflow so same-repository PR runs cannot access
write-capable R2 credentials. Restrict the existing
BAML_SCCACHE_R2_ACCESS_KEY_ID and BAML_SCCACHE_R2_SECRET_ACCESS_KEY secrets to
trusted canary or dispatch runs, or provide a dedicated read-only credential for
PR-controlled tests.
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.github/workflows/ix-cargo-tests.reusable.yaml.github/workflows/ix-ci.yml
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Nothing outside the
ix-*workflow files.#4537 withheld the R2 credentials from the ix lane because the seed disk was expected to carry
target/.Seed restore is currently refused with
snapshot has no captured block-volume root, so cold jobs rebuild the workspace and can overrun the 40-minute MSRV ceiling.What changes
ix-ci.ymlpasses the existingBAML_SCCACHE_R2_*secrets to cargo tests and the size gate. This matchesci.yaml, where the Blacksmith gating lane passes the same repository secrets to the same checked-out code withsecrets: inheritGitHub withholds repository secrets from fork and Dependabot pull requests.
Those runs remain secretless and use the machine-local sccache.
.envrcswitches to R2 only when both values are present.