pre-commit workflow (easy-graph/Easy-Graph)

The pre-commit workflow from easy-graph/Easy-Graph, explained and optimized by Latchkey.

What it does

This is the pre-commit workflow from the easy-graph/Easy-Graph repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-3-Clause license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

name: pre-commit

on:
  workflow_dispatch:
  pull_request:
    branches:
      - pybind11
  push:
    branches:
      - pybind11

jobs:
  pre-commit:
    runs-on: ubuntu-22.04
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0

    - uses: actions/setup-python@v5
      with:
        python-version: '3.10'

    - name: Install pre-commit
      run: python -m pip install pre-commit

    - name: Run pre-commit on changed files
      shell: bash
      run: |
        if [[ "${{ github.event_name }}" == "pull_request" ]]; then
          base_ref="${{ github.event.pull_request.base.sha }}"
        elif [[ -n "${{ github.event.before }}" && ! "${{ github.event.before }}" =~ ^0+$ ]]; then
          base_ref="${{ github.event.before }}"
        else
          base_ref="$(git rev-parse HEAD~1)"
        fi

        pre-commit run --show-diff-on-failure --color=always --from-ref "$base_ref" --to-ref "${{ github.sha }}"

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: pre-commit
 
on:
  workflow_dispatch:
  pull_request:
    branches:
      - pybind11
  push:
    branches:
      - pybind11
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  pre-commit:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0
 
    - uses: actions/setup-python@v5
      with:
        cache: 'pip'
        python-version: '3.10'
 
    - name: Install pre-commit
      run: python -m pip install pre-commit
 
    - name: Run pre-commit on changed files
      shell: bash
      run: |
        if [[ "${{ github.event_name }}" == "pull_request" ]]; then
          base_ref="${{ github.event.pull_request.base.sha }}"
        elif [[ -n "${{ github.event.before }}" && ! "${{ github.event.before }}" =~ ^0+$ ]]; then
          base_ref="${{ github.event.before }}"
        else
          base_ref="$(git rev-parse HEAD~1)"
        fi
 
        pre-commit run --show-diff-on-failure --color=always --from-ref "$base_ref" --to-ref "${{ github.sha }}"
 

What changed

• Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
• Cancel superseded runs when a branch or PR gets a newer push.
• Cache dependency installs on the setup step so they are served from cache.
• Add a job timeout so a hung step cannot burn hours of runner time.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

• Dependency installs

This workflow runs 1 job per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow