Pre-commit Checks workflow (hakancelikdev/unimport)

The Pre-commit Checks workflow from hakancelikdev/unimport, explained and optimized by Latchkey.

What it does

This is the Pre-commit Checks workflow from the hakancelikdev/unimport repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

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

The workflow

name: Pre-commit Checks
on: [push, pull_request]

env:
  PYTHON_VERSION: "3.13"

jobs:
  pre-commit:
    name: Run pre-commit checks
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Python ${{ env.PYTHON_VERSION }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          architecture: x64
          cache: "pip"

      - name: Cache pip dependencies
        uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key:
            ${{ runner.os }}-pip-${{ env.PYTHON_VERSION }}-${{
            hashFiles('**/pyproject.toml') }}
          restore-keys: |
            ${{ runner.os }}-pip-${{ env.PYTHON_VERSION }}-

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          python -m pip install tox

      - name: Run pre-commit checks
        run: tox -e pre-commit
        timeout-minutes: 10

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Pre-commit Checks
on: [push, pull_request]
 
env:
  PYTHON_VERSION: "3.13"
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  pre-commit:
    timeout-minutes: 30
    name: Run pre-commit checks
    runs-on: latchkey-small
 
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
 
      - name: Set up Python ${{ env.PYTHON_VERSION }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          architecture: x64
          cache: "pip"
 
      - name: Cache pip dependencies
        uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key:
            ${{ runner.os }}-pip-${{ env.PYTHON_VERSION }}-${{
            hashFiles('**/pyproject.toml') }}
          restore-keys: |
            ${{ runner.os }}-pip-${{ env.PYTHON_VERSION }}-
 
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          python -m pip install tox
 
      - name: Run pre-commit checks
        run: tox -e pre-commit
        timeout-minutes: 10
 

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.
• 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