Helm output

[theosanderson]

resolves #

Screenshot

PR Checklist

• All necessary documentation has been adapted.
• The implemented feature is covered by appropriate, automated tests.
• Any manual testing that has been done is documented (i.e. what exactly was tested?)

🚀 Preview: Add preview label to enable

[claude]

Code Review for Helm Template Output Generation

Overview

This PR introduces automated generation and documentation of Helm template outputs across different configurations. The implementation follows a similar pattern to the existing schema-dump.yml workflow and adds valuable documentation for reviewers.

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✅ Strengths

1. Good Documentation: The README.md clearly explains the purpose and structure of the generated files
2. Consistent Pattern: Follows the established pattern from schema-dump.yml for label-based auto-commits
3. Multi-config Support: Properly handles different value configurations (default, e2e-dev, preview-server)
4. Artifact Organization: Good use of GitHub artifacts to pass data between jobs
5. Timestamp Normalization: Smart sed replacement to ensure consistent output (.github/workflows/helm-template-output.yml:45)

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🔍 Issues & Concerns

1. Missing Preview Server Output (High Priority)

The workflow matrix includes preview-server configuration, but the PR doesn't contain any files in kubernetes/loculus/docs/rendered/preview-server/.

Expected: Files in all three directories (default, e2e-dev, preview-server)
Actual: Only default and e2e-dev directories present

Questions:

• Did the preview-server generation fail silently?
• Should preview-server be excluded from this PR?
• Is there a conditional that skips it?

2. Shell Script Security & Best Practices (.github/scripts/split-helm-output.sh)

Minor Issues:

• Line 43: The print statement should use > instead of >> for the first write to ensure we start with a clean file:

  # Current (could append to existing files):
  print > current_file
  
  # Consider adding explicit truncation or using > initially, then >> for subsequent writes

• Line 38: The mkdir -p via system() call could fail silently. Consider adding error handling:

  if (system("mkdir -p \"" dir "\"") \!= 0) {
      print "Error creating directory: " dir > "/dev/stderr"
      exit 1
  }

• Line 66-67: The cleanup step removes the input file before confirming success. If anything fails after this point, the input is lost. Consider moving rm -f after the success message or adding error handling.

Good Practices Already Implemented:

• ✅ set -euo pipefail for proper error handling
• ✅ Proper quoting of variables
• ✅ Clear error messages

3. Workflow Error Message Inconsistency

Line .github/workflows/helm-template-output.yml:122 references the label in the error message, but there's a minor inconsistency:

echo "::error::Helm template output changes detected but 'update_helm_output' label is not present on the PR"
echo "Please add the 'update_helm_output' label if these changes are intentional"

This is fine, but for consistency with schema-dump.yml (which uses update_db_schema), the message could be clearer about the exact label name.

4. Version Pinning

• .github/workflows/helm-template-output.yml:27: Uses @v5 for checkout action
• .github/workflows/helm-template-output.yml:33: Uses @v4 for setup-helm
• Compare to schema-dump.yml:37 which uses @v6 for checkout

Recommendation: Update to checkout@v6 for consistency with other workflows, or document why v5 is required.

5. Potential Race Condition (Low Priority)

Lines .github/workflows/helm-template-output.yml:78-88: The artifact reorganization removes existing directories before moving new ones. If the workflow is run concurrently on the same PR (unlikely but possible), this could cause issues. Consider using atomic moves or checking for concurrent runs.

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🧪 Test Coverage

Missing:

• No validation that the split actually worked correctly (e.g., checking file count matches expected)
• No validation that all expected files were generated
• Consider adding a step to verify the output structure before committing

Suggestion: Add a validation step:

- name: Validate output structure
  run: |
    # Check that we have the expected key files
    for config in default e2e-dev preview-server; do
      if [ \! -f "kubernetes/loculus/docs/rendered/$config/loculus-backend.yaml" ]; then
        echo "::error::Missing expected file: $config/loculus-backend.yaml"
        exit 1
      fi
    done

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🎯 Recommendations

1. Investigate the missing preview-server output before merging
2. Add output validation to catch silent failures
3. Consider adding the update_helm_output label requirement to CONTRIBUTING.md or the main CLAUDE.md
4. Update checkout action to v6 for consistency
5. Add error handling in the awk script for mkdir failures
6. Consider moving the rm command in split-helm-output.sh to after success confirmation

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📋 PR Checklist Review

From the PR description:

• All necessary documentation has been adapted - ✅ README.md is good, but consider updating CONTRIBUTING.md
• The implemented feature is covered by appropriate, automated tests - ⚠️ No validation tests for correctness
• Any manual testing that has been done is documented - ❌ Not documented

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🔒 Security Considerations

• No obvious security vulnerabilities
• Proper use of git config for the bot user
• No credential exposure risks
• Artifact retention is appropriately limited to 1 day

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⚡ Performance Considerations

• Matrix strategy is efficient for parallel generation
• Artifact download/upload is appropriate for the file sizes
• The sed timestamp replacement is a simple but effective approach
• The awk-based splitting is efficient for this use case

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📝 Summary

This is a solid implementation that adds valuable documentation for Helm template changes. The main concern is the missing preview-server output which should be investigated before merging. The shell script could benefit from minor improvements in error handling, but the core functionality is sound.

Recommendation: Request changes to address the missing preview-server output and add validation steps. Once those are resolved, this would be ready to merge.