build-cran-binaries/local/tests
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fix(local): stop proposing per-dependent patches for dependency-cascade failures (#121)
## Problem

The scheduled `--open-issue` run (issue #120) posted **800+** proposed entries, all `rcppparallel-bundled-tbb` on `ubuntu-2604`, each pre-filling `RcppParallel/disable-tbb.patch` for an unrelated package (`ACEsimFit`, `AovBay`, `AdaptGauss`, ...).

Root cause: those packages fail on ubuntu-2604 only because their **RcppParallel dependency** does not build there. bincraft records RcppParallel's TBB error text against each dependent, so every one of them matches the `rcppparallel-bundled-tbb` signature. Proposing a RcppParallel source patch for `ACEsimFit` is not just noise -- it is **broken**: the diff targets RcppParallel's `Makevars.in`, so it cannot apply to a dependent's source.

## Fix

Add an optional `applies_to` field that pins a package-specific fix to the package it targets:

- A signature whose fix is a curated per-package source patch (`rcppparallel-bundled-tbb` -> `RcppParallel`) is only ever proposed **for that package**.
- Other packages matching the signature are downstream failures, reported as **"blocked on `<dependency>`"** and never proposed a bogus entry. Fix the dependency once and the whole cascade clears.

Generic levers (the `tbb-stddef-removed` makevars fix) are unaffected -- they carry no `applies_to`, so they still apply to any matching package.

## Changes

- gate proposal generation in `build_triage_report()` on `applies_to`; add a `blocked_on` field to group records
- surface blocked groups in both `failing-builds-report.R` and `propose-patches.R` instead of the misleading "already registered" note
- document `applies_to` in the signature-table header

## Verification

- New tests: RcppParallel dependents are blocked (no `proposed_entries`, `blocked_on = "RcppParallel"`), while RcppParallel *itself* is still proposed when it is the failing package.
- Reproduced the avalanche end-to-end with a stubbed DB: 5 dependents now report "Blocked on RcppParallel: 5 package(s) fail because RcppParallel does not build" and **zero** candidates are emitted; a genuine `tbb-stddef` proposal in the same run is unaffected.
- Full suite: 84 tests pass; all pre-commit hooks pass.

Refs #120.

Note: the underlying build problem (RcppParallel failing on ubuntu-2604 despite its registry entry) is real and separate -- this PR stops the classifier from spamming broken per-dependent proposals about it.
Reviewed-on: #121
2026-07-14 18:40:41 +00:00
..
test-build-all-args.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
test-failing-builds-classify.R fix(local): stop proposing per-dependent patches for dependency-cascade failures (#121) 2026-07-14 18:40:41 +00:00
test-proposal-tracking-lib.R fix(local): route multi-signature packages to human triage in the proposer (#119) 2026-07-14 17:11:54 +00:00
test-r-minor-helpers.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
test-trim-pkgcache.R fix(ci): bound pkgcache _metadata growth to stop macmini disk-fill (#110) 2026-07-13 09:31:29 +00:00