docs(issue-57): enhance case study with online research, reproducers, and ldd analysis#59
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docs(issue-57): enhance case study with online research, reproducers, and ldd analysis#59
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Adding CLAUDE.md with task information for AI processing. This file will be removed when the task is complete. Issue: #57
Add online research findings covering: - ldd broken pipe behavior in GitHub Actions (cosmetic, not a crash) - Homebrew permission check mechanics and conditions - du exit code pitfall under set -euo pipefail (detailed analysis) Fix log filename reference: ci-job-64665886012.log → .txt Add reproducer script in experiments/ to demonstrate root cause and fix. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Not intended for the main codebase. Follows same pattern as PR #58. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Enhances the case study for Issue #57 (CI/CD failure due to
duexit code regression from Issue #55 fix) with comprehensive analysis including online research findings.Issue Reference
Related to #57
What was already fixed (by PR #58)
The root cause of the CI failure was a regression introduced by the Issue #55 fix:
du -sbwas called on paths that may not exist (e.g.$HOME/.linuxbrewwhen Homebrew failed to install)set -euo pipefail,du's exit code 1 for non-existent paths propagated through$(...)command substitution, killing the sandbox sub-scriptduby building abrew_paths=()array firstWhat this PR adds
Enhances
docs/case-studies/issue-57/CASE-STUDY.mdwith:Online research findings:
lddBroken Pipe analysis: Theldd --version | head -n1pipeline causes cosmetic "Broken Pipe" messages in GitHub Actions. Confirmed harmless (Homebrew usesset -unotset -e). References/usr/bin/ldd: line 41: printf: write error: Broken pipeCodSpeedHQ/action#89 and Broken Pipe error with Linux builds actions/runner-images#3414.du+set -euo pipefailpitfall: Detailed explanation with GNU bash manual reference showing why$(du -sb nonexistent 2>/dev/null | awk ...)fails under strict mode.Reproducer script:
experiments/test-du-exit-code-issue57.sh— demonstrates the root cause (Test 1) and the fix (Test 2).Log filename fix: Corrects
ci-job-64665886012.log→ci-job-64665886012.txtreference.Files Changed
docs/case-studies/issue-57/CASE-STUDY.md— enhanced with online research sectionexperiments/test-du-exit-code-issue57.sh— new reproducer script (NEW)Verification
The "Measure Disk Space and Update README" CI workflow now passes on main (run 22445566714) confirming the original fix is working.
This PR was created automatically by the AI issue solver
Fixes #57