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ci: gate the sccache wrapper on the R2 secret so fork PRs build uncached #526

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lgahdl wants to merge 1 commit into from
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ci: gate the sccache wrapper on the R2 secret so fork PRs build uncached #526

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7 changes: 6 additions & 1 deletion .github/workflows/ci.yml
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Expand Up @@ -29,7 +29,12 @@ env:
# deterministic, so PR builds writing to the shared bucket write correct objects
# under correct keys (no poisoning); bound storage with an R2 lifecycle-expiry
# rule on the bucket (sccache does not evict cloud backends itself).
RUSTC_WRAPPER: sccache
# GitHub withholds repo secrets from pull_request runs whose head is a fork, so
# R2_ACCOUNT_ID is empty there; only enable the wrapper when the secret exists,
# or fork PRs fail at sccache startup before compiling anything (empty endpoint
# host). Fork PRs are exactly the runs that shouldn't reach the write-capable
# cache anyway, so uncached-but-green is the right degradation.
RUSTC_WRAPPER: ${{ secrets.R2_ACCOUNT_ID != '' && 'sccache' || '' }}
CARGO_INCREMENTAL: "0"
SCCACHE_BUCKET: shepherd-sccache
SCCACHE_ENDPOINT: https://${{ secrets.R2_ACCOUNT_ID }}.r2.cloudflarestorage.com
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