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Limit clang-tidy CI to changed files on branch workflows#390

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simon-d-bmw wants to merge 3 commits intoeclipse-openbsw:mainfrom
simon-d-bmw:gh-381-limit-clang-tidy-ci-scope
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Limit clang-tidy CI to changed files on branch workflows#390
simon-d-bmw wants to merge 3 commits intoeclipse-openbsw:mainfrom
simon-d-bmw:gh-381-limit-clang-tidy-ci-scope

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@simon-d-bmw simon-d-bmw commented Mar 12, 2026

Summary

  • run the full clang-tidy scan only on pushes to main
  • run clang-tidy on changed .c, .cc, and .cpp files for pull requests, merge groups, and other branch pushes
  • skip clang-tidy cleanly when no C/C++ files changed

Details

  • add a dedicated CI helper to determine clang-tidy scope from the GitHub event payload
  • keep the existing clang-tidy findings export and reporting flow
  • update the developer documentation to describe the branch-vs-main behavior

Refs #381

@simon-d-bmw
Limit clang-tidy CI to changed files on branch workflows (eclipse-ope…
78ad0d4 
…nbsw#381)

Run the full clang-tidy scan only on pushes to main.
Use changed C/C++ files for pull requests, merge groups, and other branch pushes.
@simon-d-bmw
Touch console.cpp to validate changed-file clang-tidy CI (eclipse-ope…
343c3ff 
…nbsw#381)

No functional change.
This updates a single C++ source file so the public PR can confirm clang-tidy only runs on changed files.
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simon-d-bmw commented Mar 12, 2026

To test the determination of clang-tidy scope, I've added a commit which changes only console.cpp. The result is shown in this screenshot:
image

-> detection worked as expected

@simon-d-bmw
Handle empty clang-tidy findings output (eclipse-openbsw#381)
f13cceb 
Treat an empty fixes YAML as zero findings so changed-file clang-tidy runs do not crash when no diagnostics are emitted.
Also align the workflow step id with GitHub Actions context validation.
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