ci: fetch fast in clang-diff-format.yml

[PastaPastaPasta]

Issue being fixed or feature implemented

Fetch fast in clang-diff CI. It used 268 minutes in last ~30 days. Each run I look at shows ~80% of the time being spent fetching.

What was done?

How Has This Been Tested?

Breaking Changes

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

[github-actions]

✅ No Merge Conflicts Detected

This PR currently has no conflicts with other open PRs.

[greptile-apps]

Greptile Overview

Greptile Summary

This PR optimizes the clang-diff-format.yml CI workflow by reducing the git fetch operation from fetching all branches to fetching only the develop branch. The workflow checks C++ code formatting by comparing changes against the base branch (develop). Since only the develop branch is needed for the diff comparison on line 17, the change eliminates unnecessary fetching of other branches and tags. The modification adds -f (force) and -u (unconditional) flags to ensure the local develop ref is always updated to match remote. This targeted optimization is expected to reduce CI runtime from ~268 minutes over 30 days to roughly 20% of that duration by eliminating the 80% overhead spent fetching.

Important Files Changed

Filename	Score	Overview
.github/workflows/clang-diff-format.yml	5/5	Changed git fetch from fetching all branches to fetching only develop branch with force and unconditional flags to reduce CI runtime

Confidence score: 5/5

• This PR is safe to merge with minimal risk as it is a well-scoped performance optimization to CI infrastructure
• Score reflects that the change is simple, correctly scoped, and addresses only the git fetch operation without modifying any logic or introducing breaking changes
• No files require special attention; the single-line change is straightforward and the optimization is correctly targeted to the workflow's actual needs

Context used:

• Context from dashboard - CLAUDE.md (source)

_{1 file reviewed, no comments}

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[coderabbitai]

Walkthrough

The .github/workflows/clang-diff-format.yml workflow file was updated to modify the fetch operation. The fetch step now explicitly uses git fetch -fu origin develop:develop instead of a default fetch behavior. This ensures a specific refspec is used when fetching from the origin remote, targeting the develop branch. All other workflow steps and logic remain unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Single-line change in a CI/CD configuration file
• Straightforward update to git fetch command syntax
• No logic changes or multi-file impacts
• Verify that the new refspec is correct for the intended workflow behavior

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The PR title "ci: fetch fast in clang-diff-format.yml" is directly related to the main change described in the raw summary. The change involves updating the fetch step in the clang-diff-format workflow to use a specific refspec (git fetch -fu origin develop:develop) for performance optimization. The title clearly communicates the primary objective—optimizing fetch performance in a CI workflow—and specifies which file is being modified. The title is concise, specific, and captures the essence of the changeset from the developer's perspective.
Description Check	✅ Passed	The PR description is related to the changeset. It identifies the performance problem being addressed—that the clang-diff CI consumed 268 minutes over 30 days with approximately 80% of time spent on fetching—which provides clear motivation for the workflow update. While the description does not explicitly detail the implementation changes or testing approach, the evaluation criteria specify that level of detail is not important as long as the description relates to the changeset, which this one does.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e4fa575 and fa22c3d.

📒 Files selected for processing (1)

• .github/workflows/clang-diff-format.yml (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

.github/**

📄 CodeRabbit inference engine (CLAUDE.md)

Unless specifically prompted, avoid making changes to .github (GitHub workflows and configs)

Files:

• .github/workflows/clang-diff-format.yml

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: Build container / Build container

🔇 Additional comments (1)

.github/workflows/clang-diff-format.yml (1)

14-14: Solid fetch optimization.

The explicit refspec git fetch -fu origin develop:develop narrows the fetch to only the target branch instead of all branches, which directly addresses the goal of reducing fetch time. The -f and -u flags are appropriate for CI reliability. Line 17's reference to origin/develop will work correctly after this fetch.

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[UdjinM6]

utACK fa22c3d