docs(watcher): two traps in the multi-PR fan-out - #343
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merge-gate-watcher.md already says a multi-PR loop needs one latch per PR. Two further traps in that shape are not recorded, and both produce a confident wrong answer rather than an error. A per-PR output file keyed by `owner/repo` puts a slash in the filename, so the redirect targets a directory that does not exist. Every watcher in the fan-out dies at once and the only evidence is one "No such file or directory" line per watcher, above the summary where nobody reads. Ending the fan-out with `wait; echo "all gates settled"` prints that line whatever happened - the watchers ran, died on the bad redirect, or were never started. It is the loop's own claim about itself. Print the per-PR results, or count the files that actually exist. Both fired in one session, together: a fan-out over seven pull requests wrote no files and reported that every gate had settled. Assisted-by: claude-code:claude-opus-5 Agent-Session: https://claude.ai/code/session_01NLJXhUjDbihKeu1d51gwWD Agent-Host: 0493f0 Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>
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📝 WalkthroughWalkthroughThe merge gate watcher documentation adds two fan-out failure warnings. Repository basenames now determine per-PR output filenames, which avoids slash-containing repository names creating invalid paths. The example waits for watcher processes and counts produced result files instead of printing an unconditional settled-state success message. Priority: ⬇️ Low Change: Other Merge Risk: 🟡 Moderate · up to The documented fan-out workflow can lose results or fail before launching watchers, so these examples should be corrected before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@skills/git-workflow/references/merge-gate-watcher.md`:
- Line 176: Update the output filename construction around the gate watcher’s
out variable so it preserves the full repository identity from $1 rather than
stripping the owner with ${1##*/}. Use a collision-safe encoding or digest,
while retaining the gate number and existing output-file behavior.
- Around line 172-180: Use the existing temporary-directory variable d in the
merge-gate watcher output path and final file-count check; replace the undefined
DIR references while preserving the current filename pattern and background
process flow.
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skills/git-workflow/references/merge-gate-watcher.md
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Two review findings on the snippet this PR adds, both real.
It referenced $DIR without defining it, so a reader pasting it writes to a
root-relative path - the very failure the paragraph above it describes. The
snippet now declares PRS and dir, and is executable as written.
And the advice was wrong in the direction it warns about: keying the file by
${1##*/} drops the owner, so alice/api 12 and bob/api 12 both land on
gate-api-12.txt and one overwrites the other. Slugify the whole identity
instead - ${1//[^A-Za-z0-9._-]/_}.
Run with a stub producer over "alice/api 12", "bob/api 12" and
"netresearch/foo 11": three distinct files, gate-alice_api-12.txt,
gate-bob_api-12.txt, gate-netresearch_foo-11.txt.
Assisted-by: claude-code:claude-opus-5
Agent-Session: https://claude.ai/code/session_01NLJXhUjDbihKeu1d51gwWD
Agent-Host: 0493f0
Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>
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Self-review: 2d57c47 The bot review this pull request demands is unsatisfiable (Copilot quota wall or repeated bot failures on this head). The diff on this head was reviewed by the PR author; this comment is the on-the-record attestation the merge gate reads back. It stops matching on the next push. |
Merging this adds two traps to the multi-PR section of
references/merge-gate-watcher.md, with the corrected snippet. The file already says a multi-PR loop needs one latch per PR; these two are the ones that make the fan-out lie rather than fail.A per-PR output file keyed by
owner/repowrites into a directory that does not exist.out="$DIR/gate-$1-$2.txt"with$1=netresearch/fooexpands to$DIR/gate-netresearch/foo-12.txt. The redirect fails, every watcher in the fan-out dies at the same instant, and the only evidence is oneNo such file or directoryline per watcher, printed above the summary. Key by${1##*/}instead.A trailing
echoafterwaitasserts a state nothing read.for …; do … & done; wait; echo "all gates settled"prints that sentence whether the watchers ran, died on the bad redirect, or were never started. It is the loop's own claim about itself. Print the per-PR results, or count the files that actually exist —ls "$DIR"/gate-*.txt | wc -lis one call and cannot report what did not happen.Both fired together in one session: a fan-out over seven pull requests produced no files and reported that every gate had settled. The second trap is what made the first one invisible — with the
echoremoved, the missing files would have been the obvious next question.Checks
markdownlint-cli2on the changed file: 0 issues.validate-skill.sh: 0 errors. All 25 test scripts intests/: pass.Assisted by claude-code:claude-opus-5 — Session