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kevinveenbirkenbachandClaude Opus 5
9f179e8edc
Host and container share this checkout through a bind mount but run as different uids -- 1000 and 0, measured. Whichever writes .ruff_cache or .import_linter_cache first owns it, and the other is then locked out: ruff aborts with "Failed to create temporary file: Permission denied" and test_import_contracts fails the same way, reporting a broken contract that is in fact perfectly intact. Point both at build/<tool>-cache-$(id -u). build/ is already 0777 and gitignored, and this is the mechanism the lint stamp (build/install-lint-<hash>.stamp) already uses to keep the two environments apart. Passing --no-cache would have silenced the symptom at the cost of the cache on every single run. The pre-existing .ruff_cache and .import_linter_cache are nobody-owned and cannot be removed without root; they are simply unused from now on. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Python Lint 🐍
Python-specific code conventions: unittest import shape, PROJECT_ROOT usage, ban on raw os.walk/Path.rglob/uncached read_text, noqa marker hygiene, redundant boolean patterns, and self-path-reference avoidance.
Tests in this directory MUST only cover Python source patterns. Dependency declarations MUST live under dependencies/; YAML/Jinja patterns MUST live under yaml/.
For framework and make test-lint usage see lint.md.