build-cran-binaries/.crow
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fix(abi): prune flat-slot binaries of ABI-risky packages (#200)
## Why

`base64enc` still fails to install under R 4.6 even after it was built into the 4.6 slot:

```
base64enc.so: undefined symbol: SETLENGTH
```

The per-minor binary is correct and serves correctly to any client the router can identify. But the **flat slot still holds a binary built under R 4.4.3**, and that is what every client receives when it cannot be routed by R minor.

That object should not exist. `upload_single_binary()` writes an ABI-risky package only to the per-minor path:

```r
if (is_r_minor_sensitive) {
  remote_tarball_path <- file.path(remote_bin_path, minor_version, tarball_name)
} else {
  remote_tarball_path <- file.path(remote_bin_path, tarball_name)
}
```

`base64enc`'s flat binary is a legacy artifact from before it was classified risky. Removing it makes the outcome correct regardless of routing, user agent, downloader or renv configuration, which is the part I could not otherwise guarantee.

## What it does

`local/prune-stale-flat-binaries.R` lists a slot's flat objects, intersects them with the risky set, and deletes them. Deleting is safe here: the source fallback republishes the CRAN source under the same key, so the package stays installable everywhere and compiles against the client's own R, while routed clients keep getting the per-minor binary.

Safety posture, given this deletes production objects:

- **dry run by default**; nothing is removed without `--apply`
- takes an **explicit package list**, so the first runs need not trust the classifier cache at all
- **refuses to proceed on an empty risky set**, which is indistinguishable from an unreachable cache and would otherwise report success having pruned nothing
- **keeps objects whose package CRAN no longer ships**, since there would be no source to fall back to and the package would vanish
- **re-indexes and purges in the same run**. This is not optional: a published index naming deleted files serves 404s, which is worse than the binary it replaced.

## Use

```sh
# dry run first
crow pipeline create devxy/build-cran-binaries \
  --var prune_flat=ubuntu-2604-amd64 --var PRUNE_PACKAGES="base64enc lobstr"

# then apply
crow pipeline create devxy/build-cran-binaries \
  --var prune_flat=ubuntu-2604-amd64 --var PRUNE_PACKAGES="base64enc lobstr" \
  --var PRUNE_APPLY=yes
```

`crow lint` passes.

## Sequencing

Run with an explicit list first, on one slot, and confirm the flat URL then serves source while the per-minor URLs still serve binaries. Only widen to the cache-derived set once the backfill has finished and its output looks sane: the first 250 classifications came back 232 r-minor-sensitive, and a rate that high suggests the source-grep classifier is broader than the set that actually breaks, which is worth checking before pruning thousands of flat binaries.

Reviewed-on: #200
2026-09-04 10:54:09 +00:00
..
archive-missed-packages.yaml fix(index): add a slot repair for a broken Built stamp and retire alpine 3.21 (#150) 2026-08-07 09:15:04 +00:00
auto-apply-patches.yaml fix(ci): install RPostgres for audit workflows (#172) 2026-08-30 07:31:28 +00:00
backfill-abi-classification.yaml feat(abi): backfill classifier verdicts for pre-per-minor packages (#199) 2026-09-04 10:34:49 +00:00
build-all-versions-install-deps.yaml fix(ci): make every manual gate default to a value that matches nothing (#158) 2026-08-09 15:31:14 +00:00
build-all-versions.yaml fix(ci): install RPostgres in build shards (#195) 2026-09-03 20:09:20 +00:00
process-updates.yaml fix(ci): install RPostgres for metadata updates 2026-08-28 08:48:58 +00:00
prune-stale-flat-binaries.yaml fix(abi): prune flat-slot binaries of ABI-risky packages (#200) 2026-09-04 10:54:09 +00:00
rebuild-abi-gap.yaml feat(ci): add a targeted per-R-minor rebuild workflow (#198) 2026-09-04 10:24:47 +00:00
reindex.yaml fix(cdn): purge the staging zone too (#181) 2026-08-31 10:31:35 +00:00
repair-built-stamp.yaml fix(ci): make every manual gate default to a value that matches nothing (#158) 2026-08-09 15:31:14 +00:00
trial-build-registry.yaml fix(ci): gate the three ungated pipelines on their own variable (#155) 2026-08-09 10:02:05 +00:00
weekly-audit-missing.yaml fix(ci): install RPostgres for audit workflows (#172) 2026-08-30 07:31:28 +00:00
weekly-patch-proposals.yaml fix(ci): install RPostgres for audit workflows (#172) 2026-08-30 07:31:28 +00:00
weekly-rebuild-missing.yaml Revert "fix(ci): split oversized weekly rebuild matrix" 2026-08-14 07:01:56 +00:00
weekly-rebuild-reindex.yaml fix(cdn): purge the staging zone too (#181) 2026-08-31 10:31:35 +00:00