fix(build): judge each index by its own source fallbacks #193
2026-09-02
fix(build): judge each index by its own source fallbacks
The source-fallback list is read from the flat slot's PACKAGES.gz and names the packages that index serves as CRAN source rather than as a binary. It was then applied to every path in the listing, including per-minor ones. A package the flat slot serves as source still has a genuine `4.4/<pkg>.tar.gz`, so removing that basename deleted a real binary from the cache and made every per-minor pass rebuild it, every run, forever. The overlap with the work list is total, not partial: the sensitive candidate list is exactly "sensitive packages with no flat binary", which is the same set this removed. That pinned the cache-driven skip rate near zero even after #192 made the per-minor objects visible. amd64/resolute listed 21212 per-minor objects but cached only 13572, then recompiled osmdata, osqp and outbreaker2 while their 4.4 binaries sat in the bucket returning HTTP 200. This change will: - read each per-minor index and exclude only that minor's own source fallbacks - keep judging flat-slot objects by the flat index - report the fallback count per index, so a collapse is visible in the log