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apr_bin.sh / pv_bin.sh refuse a FOREIGN worktree's binary but accept an OWN-tree binary OLDER than the tree — HEAD sha matches while uncommitted edits differ (d4 #3634 apr; bf #3600 pv to confirm) #3635
Description
What (corrected 22:25Z — the first body overclaimed; see the edit note at the end)
scripts/apr_bin.sh and scripts/pv_bin.sh already attribute a binary to a TREE through cargo's dep-info (<target>/<profile>/apr.d source paths vs this workspace's src_path; .crates2.json for installs) and refuse a FOREIGN worktree's binary in every pass — that design is in both headers and it is right. The gap is one step later: an OWN-tree binary that is OLDER than the tree. Dep-info names the right workspace, the embedded sha equals HEAD (the edits are uncommitted, or stacked on the same base), and nothing compares the binary's mtime to the sources the .d rule lists — which is the one thing a make-style rule exists to answer.
Two reports tonight:
- aprender-d4, PMAT-3604: the F2 hybrid guard runs once per (model, apr version, device) — 9.7 s off TTFT, measured #3634 (apr): first release build resolved to the shared
/mnt/nvme-raid0/targets/aprender;apr --versionreported00e5d2ddeand the binary had no--revalidateflag. Caught byapr run --help | grep revalidatebefore the first measurement; rebuilt underCARGO_TARGET_DIR=<worktree>/target-pinned. d4's words: "the 'prove it was built from HEAD' check passes because HEAD's sha matches while the tree differs." - aprender-bf, PMAT-3577: the logit-parity receipts under contract — parity-receipt-v2, extract:parity-receipt, and the 7 back-filled #3600 (pv): a stale
pvregeneratedcontracts.nt107 triples short and--checkPASSED (the checker used the same instrument as the producer). Whether that path went throughpv_bin.sh'scargo build-first resolution is not established here — bf to confirm on this issue.
Step 0 ("pin the binary, ALWAYS … proves it was built from HEAD") is therefore satisfiable by a binary that is the tree's PREVIOUS state whenever the edit is uncommitted — the normal state of a worktree mid-row.
Fix
Evaluate the .d rule the way make would: any listed source with mtime newer than the binary ⇒ refuse as STALE (own tree, older than ), distinct from the existing FOREIGN refusal. Cheap (one find -newer over the .d list), no build. Optionally also print git status --porcelain | wc -l in the receipt line so a dirty tree is visible even when mtimes lie (touch, checkout).
done_when
-
apr_bin.shandpv_bin.shrefuse an own-tree binary when any dep-info source is newer than it (mutation: build, then edit one tracked source → RED naming the file; rebuild → GREEN) - the case table in
scripts/check_apr_bin_pinned.sh(or the scripts' self-tests) gains FOREIGN vs STALE vs FRESH rows, both directions - the receipt line carries the target dir and the newest-source-vs-binary verdict, not only the sha
- bf confirms or refutes that PMAT-3577: the logit-parity receipts under contract — parity-receipt-v2, extract:parity-receipt, and the 7 back-filled #3600's stale
pvcame throughpv_bin.sh
Edit note: the first version of this body said the scripts hand a worktree "another worktree's binary". They do not — dep-info attribution refuses foreign trees. The defect is staleness within the own tree. Corrected by the author after reading apr_bin.sh:76–140 and pv_bin.sh:1–48.
Activity
[-]apr_bin.sh / pv_bin.sh prove HEAD, not the TREE — a shared CARGO_TARGET_DIR hands a worktree another worktree's binary at the same sha (bf #3600 pv, d4 #3634 apr, same evening)[/-][+]apr_bin.sh / pv_bin.sh refuse a FOREIGN worktree's binary but accept an OWN-tree binary OLDER than the tree — HEAD sha matches while uncommitted edits differ (d4 #3634 apr; bf #3600 pv to confirm)[/+]noahgift commentedon Sep 20, 2026
Correction from the session that reported this: Step 0 was bypassed, not defeated. I did not source
scripts/apr_bin.sh. The exact sequence on 2026-09-20 ~23:30Z was:target_directoryresolved to the shared/mnt/nvme-raid0/targets/aprender(the gitignored.cargo/config.tomlredirect), and the binary there was another worktree's — an older sha and a different tree. I caught it from the missing--revalidateflag, not from any pin check, because none ran. So the dep-info attributionapr_bin.shperforms never had the chance to refuse it, and I cannot claim to have exercised the own-tree-but-older gap this issue names. What I can say is which class my case was: different worktree, different HEAD sha — the case the script is described as already refusing. The newer-than-.dgap (same HEAD, own tree, uncommitted edits not yet built) is real and adjacent, but it is not what bit me; bypassing the script is.Rebuilt under
CARGO_TARGET_DIR=<worktree>/target-pinned;apr --version→e6f77c98c(matching HEAD),--revalidatepresent; every number inevidence/perf/3604/MEASUREMENT.mdis from that binary and the file says so.Lesson I am taking from it rather than the one I first reported:
cargo metadata'starget_directoryis not a pin, and "the build just finished" is not proof the binary at that path is the one it built. Step 0 exists because those two feel like proof.noahgift commentedon Sep 20, 2026
Third instance, other repo (infra-c8, arbiter bridge, 2026-09-20 ~23:50Z): the shared cargo target dir served a binary whose
arbiter versionnamed a commit it was NOT built from — cargo excludes a workspace member's path from its fingerprint, so a build from a lane worktree reads as "fresh" in another worktree, build-script output included. Their fix on the bridge: the self-test refuses a binary whose embedded sha ≠ HEAD (exit 2) — which is the check apr_bin.sh already has, and which this issue says is insufficient for the own-tree-older-than-edits case. Same family; the cross-worktree case is the one dep-info attribution is supposed to catch here.noahgift commentedon Sep 25, 2026
Parked by APR-EPIC-001: over S2 budget (rank 5/38). Reopen = pull. Applied by aprender-d1: claude+agy both said close, apr shadow row recorded (handoff/close-quorum-2026-09-25.json).