Author	SHA1	Message	Date
pat-s	26406a3e86	feat(ci): add a targeted per-R-minor rebuild workflow (#198) ... ## Why A user hit this on amd64/resolute under R 4.6.1: ``` base64enc.so: undefined symbol: SETLENGTH ``` R 4.6 no longer exports `SETLENGTH`: ``` R 4.4: missing -> R_ClosureEnv R_ClosureFormals R_MakeMissingBinding R_PromiseEnv R_PromiseValue R_mkClosure R 4.5: missing -> R_MakeMissingBinding R_PromiseEnv R_PromiseValue R 4.6: missing -> R_PromiseEnv R_PromiseValue SETLENGTH ``` `base64enc` calls `SETLENGTH` (`base64.c:206`, `253`), its flat binary was built under R 4.4.3, and it has no per-minor copy at all, so the union index hands that binary to a 4.6 client. The safety net missed it because the risky set is defined circularly: ```r risky_packages_across_minors <- function(...) { # a package is "risky" iff it already has a tarball in some per-minor slot ``` A package counts as ABI-risky only if it has *already* been built per-minor. `base64enc` never was, and having no new CRAN version it never enters the build list to be classified. So the per-minor protection only covers packages that passed through the pipeline after the scheme existed. ## Scope Scanning all 4,585 compiled binaries in amd64/resolute's flat index for symbols R 4.6 does not export found 10 referencing `SETLENGTH`. Most already have per-minor builds and are served correctly. Two do not: ``` base64enc_0.1-6 flat=200 4.4=404 4.5=404 4.6=404 lobstr_1.2.1 flat=200 4.4=404 4.5=200 4.6=404 ``` (`iotools` lacks a 4.5 copy but 4.5 still exports `SETLENGTH`, so it does not break.) ## What this adds Rebuilding one package into one minor was only possible with `just rebuild` from a workstation holding the S3 and Postgres credentials. This adds the CI path: ```sh crow pipeline create devxy/build-cran-binaries \ --var rebuild_abi_gap=ubuntu-2604-amd64 \ --var ABI_PACKAGES="base64enc@0.1-6 lobstr@1.2.1" \ --var ABI_R_MINOR=4.6 ``` - reuses `reindex.yaml`'s slot matrix verbatim, so the slot-to-image mapping cannot drift - runs `build-one.R --sensitive-only`, which reclassifies each version and skips anything not ABI-risky rather than writing it to the wrong slot - mounts no shared cache volume, so it cannot disturb the build pipeline's per-agent caches - attempts every package, then exits non-zero if any failed `crow lint` passes. ## Not in this PR This is the remediation path, not the fix. The circular `risky_packages_across_minors()` definition is still in place, so new instances of this class can still appear. That is the follow-up. Reviewed-on: #198	2026-09-04 10:24:47 +00:00