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fix(ci): do not call a file deleted when its clone may have failed - #2211
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The drift job's first live run reported three files as gone upstream. Chasing them found that a failed clone and a deleted file are indistinguishable once the fetch has finished: both leave a path in the manifest with nothing on disk. That run had four clone failures. The file-count slack cannot substitute for knowing. It fetched 734 of 735 -- one short, nowhere near the 50-file floor -- so nothing fired. `fetch-compat-test-files.sh` already counts its failures and prints them. It now writes the count into the corpus, and the drift script reads it: with any failure, the "file is gone" group is dropped and the reason is logged. Only that group, because a clone that did not happen cannot invent a new file or change a hash -- it can only fail to produce one. That the report cannot be adjudicated after the fact IS the argument. A later complete fetch found all three files present, and also lacked the two the run called new, so upstream moved in between; there is no way to tell now which half was which. The marker is written at the only moment the difference is knowable. Self-tested: a missing marker reads as None (an older script, or a corpus assembled another way) and suppresses nothing; 0 suppresses nothing; a count suppresses; garbage reads as None rather than 0. Ignoring the marker fails the test.
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🟢 Approval recommended
The changes are small, consistent with the PR’s stated intent, and include a self-test that exercises the new marker parsing and suppression behavior.
Pull request overview
This PR hardens the scheduled “corpus baseline drift” CI reporting so it won’t misclassify missing corpus files as upstream deletions when some repository clones failed during the fetch, improving the accuracy of drift issues like #2199.
Changes:
- Write a fetch-failure marker (
.fetch-failures) into the fetched corpus directory at the end offetch-compat-test-files.sh. - Teach
corpus-baseline-drift.pyto read that marker and, when non-zero, suppress only the"removed"(“file is gone”) drift group while still reporting additions and hash changes. - Extend the script self-test to pin correct marker parsing and the absent-vs-zero distinction.
File summaries
| File | Description |
|---|---|
| scripts/fetch-compat-test-files.sh | Records clone-failure count into the corpus directory for downstream consumers. |
| scripts/corpus-baseline-drift.py | Reads the marker, suppresses only deletion reports on partial fetches, and adds self-tests for the marker behavior. |
Review details
- Files reviewed: 2/2 changed files
- Comments generated: 0
- Review effort level: Lite
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Codecov Report✅ All modified and coverable lines are covered by tests. 📢 Thoughts on this report? Let us know! |
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✅ Compatibility Test Results
What's tested
Full results available in workflow artifacts |
This was referenced Sep 1, 2026
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The corpus-drift job from #2196 had its first live run and filed #2199. Chasing that report found a hole in it.
A failed clone and a deleted file look identical
Once the fetch has finished, both leave a manifest path with nothing on disk. That run had 4 clone failures and reported 3 files as gone upstream.
The file-count slack cannot substitute for knowing: it fetched 734 of 735 — one file short, nowhere near the 50-file floor — so nothing fired.
That it can't be adjudicated now IS the argument
A later complete fetch found all three "gone" files present, and also lacked both files that run called new. So upstream moved between the two fetches, and there is no way to tell today which half of #2199 was real.
The marker is written at the only moment the difference is knowable — during the fetch, by the code that watched the clone fail.
The fix
fetch-compat-test-files.shalready counts its failures and prints them; it now writes the count into the corpus directory (gitignored). The drift script reads it and, on any failure, drops the "file is gone" group and logs why.Only that group. A clone that did not happen cannot invent a new file or change a hash — it can only fail to produce one. So
addedand the two hash-change groups stay, and a run with failures still reports everything it can legitimately see.Self-test
None0044NoneIgnoring the marker fails the test. The absent-vs-zero distinction matters: both must report everything, and conflating them with a default of
0would silently disable the guard on any corpus the updated script didn't produce.Note on #2199
I could not resolve it as filed. Against a complete corpus today the manifest has no drift — 735 files, 735 entries, regeneration yields no diff — so there is nothing to regenerate. The next scheduled run will re-report against whatever upstream looks like then, now without the deletion half being guesswork.
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https://claude.ai/code/session_012nNGPA44Dt32NyxWem26xr