build-cran-binaries/local
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fix: recompute package snapshot when missing from cache (#95)
## Summary

`build-all.R` reads three snapshot files from `/mnt/cache/packages/` that the `build-all-versions-install-deps` step precomputes: `pkgs_to_build.rds`, `r_minor_sensitive_pkgs.rds`, and `s3_cache.rds`.
That cache volume is **per-agent**, so a build job scheduled on a different (fresh) agent than the one that ran install-deps finds the snapshot absent and dies at `readRDS` (`cannot open compressed file '/mnt/cache/packages/pkgs_to_build.rds'`).

This adds a conditional guard at the top of `build-all.R`: when any of the three files is missing, it sources `local/packages-to-build.R` (which has all needed creds via `PGPASS` / `B2_S3_*` env, already present in the build step) and writes the derived `.rds` files — exactly mirroring the install-deps command.

- The first build job on a fresh agent repopulates the shared cache, so subsequent jobs on that agent reuse it.
- Concurrent jobs that also miss simply redo the work (accepted tradeoff vs. slow shared storage like NFS).
- Saves use a temp-file + atomic `file.rename`, so a concurrent reader never sees a half-written `.rds`.

Reviewed-on: #95
2026-06-17 17:49:04 +00:00
..
tests feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
archive-missed-pkgs.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
build-all.R fix: recompute package snapshot when missing from cache (#95) 2026-06-17 17:49:04 +00:00
build-one.R perf(local): skip per-minor passes for non-r-minor-sensitive packages 2026-06-14 14:50:40 +02:00
check-cdn-cache.sh add alpine321 to scripts 2024-12-29 10:18:55 +01:00
check-NA.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
debug-packages-writing.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
detect-duplicates.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
excluded-packages.json feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
fetch-rebuild-packages-from-issue.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
find-R-api-packages.sh chore(local): add S3 migration and CRAN-source helper scripts 2026-06-14 13:02:48 +02:00
label-removed-cran-packages.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
last-processed-by-platform.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
migrate-s3-hetzner-to-backblaze.sh chore(local): add S3 migration and CRAN-source helper scripts 2026-06-14 13:02:48 +02:00
missing-cran-packages-db.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
missing-cran-packages.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
missing-packages-in-index.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
packages-to-build.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
packages-without-any-binary.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
query-pkgs-without-old-versions.R chore(local): add S3 migration and CRAN-source helper scripts 2026-06-14 13:02:48 +02:00
r-minor-helpers.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
test-package-loading.R chore(local): add S3 migration and CRAN-source helper scripts 2026-06-14 13:02:48 +02:00
weekly-missing-binaries-audit.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00