fix: Move schema cache to platform-appropriate user directory - #4571
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kddejong merged 2 commits intoJul 6, 2026
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Schemas are now downloaded to a user-writable cache directory instead of the package install location, fixing Permission denied errors on immutable installs (Nix, distro packages) and pre-commit environments. Paths follow AWS-standard conventions: Linux: ~/.cache/aws/cfn-lint/schemas/ macOS: ~/Library/Caches/aws/cfn-lint/schemas/ Windows: %LOCALAPPDATA%/aws/cfn-lint/schemas/ Respects XDG_CACHE_HOME on Linux when set. Fixes aws-cloudformation#4568 Fixes aws-cloudformation#4563
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #4571 +/- ##
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Coverage 94.40% 94.41%
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Files 429 429
Lines 15048 15056 +8
Branches 2910 2911 +1
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+ Hits 14206 14215 +9
Misses 461 461
+ Partials 381 380 -1
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Summary
~/.cache/aws/cfn-lint/schemas/~/Library/Caches/aws/cfn-lint/schemas/%LOCALAPPDATA%\aws\cfn-lint\schemas\XDG_CACHE_HOMEon Linux when setWhy
Writing into the package install directory fails on immutable/read-only installs (Nix, distro packages, containers) and can also fail in pre-commit environments. Moving to a user-writable cache location resolves both scenarios.
Auto-download on first run still works — if the cache dir is empty,
cfn-lintdownloads schemas automatically.Fixes #4568
Fixes #4563
Test plan
cfn-lint -udownloads to the new cache locationcfn-lint -u