nix: fix a regression where path inputs were locked

[sandydoo]

Testing cachix/nix#8

[claude]

Claude finished @sandydoo's task —— View job

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PR Review Complete

Overview:
This PR updates the Nix dependency in flake.lock to fix a regression where path inputs were incorrectly being locked during devenv update. The change updates the Nix input from revision 54df04f to 031c3cf, which contains the fix for this issue.

Areas for Improvement

1. Test Coverage Gap (Critical)

• Issue: No test exists to validate that path inputs are NOT locked during updates
• Risk: This regression could reoccur without detection
• Recommendation: Add a test that:
  • Creates a project with path inputs (e.g., path:./subflake)
  • Runs devenv update
  • Verifies path inputs are absent from devenv.lock
  • Confirms path inputs still reference current filesystem state

2. Missing Integration Test

• Issue: No end-to-end test covers the specific scenario that was broken
• Recommendation: Add a test in tests/ that demonstrates the fix works correctly with real path inputs

3. Documentation of Fix

• Issue: PR description lacks context about what the regression was
• Recommendation: Consider adding a comment in the commit or PR description explaining:
  • What behavior was broken (path inputs being locked)
  • Why this is problematic (path inputs should reference current filesystem state)
  • How to verify the fix works

4. Validation of Fix

• Issue: No evidence provided that the fix actually works
• Recommendation: Include test output or example showing:
  • Before: devenv update locks path inputs
  • After: devenv update correctly ignores path inputs

Code Quality Assessment

Positive aspects:

• Clean, minimal change targeting the specific issue
• Follows existing flake.lock update patterns
• Leverages upstream fix appropriately

Technical concerns:

• The fix relies entirely on the upstream Nix dependency
• No local safeguards against future similar issues
• flake.lock:127-131 shows the Nix dependency is updated correctly

Security & Performance

Security: No concerns - flake.lock updates are standard and the new revision is from the same trusted source (cachix/nix)

Performance: No concerns - dependency updates typically don't affect runtime performance

Recommendations

1. High Priority: Add regression test for path input locking behavior
2. Medium Priority: Include validation that the fix works in PR description
3. Low Priority: Consider adding inline documentation about path input behavior in relevant code sections

Overall Assessment: The change appears correct but lacks sufficient test coverage to prevent future regressions of this specific issue.

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