Lint workflow (kivymd/KivyMD)

The Lint workflow from kivymd/KivyMD, explained and optimized by Latchkey.

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Source: kivymd/KivyMD.github/workflows/lint.ymlLicense MITView source

What it does

This is the Lint workflow from the kivymd/KivyMD 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

workflow (.yml)

name: Lint
on:
  push:
    branches-ignore:
      - data
      - gh-pages
    tags:
      - '**'
  pull_request:
    branches-ignore:
      - data
      - gh-pages
  workflow_dispatch:

jobs:

  # Lint job. Runs pre-commit, fails if there are changed files
  # os, python version and architecture does not matter here
  # [${{ matrix.python-version }} | ${{ matrix.os }} ${{ matrix.architecture }}]
  lint:
    name: Check pre-commit 
    strategy:
      fail-fast: true
      matrix:
        os: [ubuntu-latest]
        python-version: ['3.13']
        architecture: [x64]
    runs-on: ${{ matrix.os }}
    env:
      PYTHONUNBUFFERED: 1

    steps:
    - name: Checkout
      uses: actions/checkout@v2

    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
        architecture: ${{ matrix.architecture }}

    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        python -m pip install --upgrade setuptools wheel
        python -m pip install --upgrade pre-commit

    - name: Check pre-commit
      run: pre-commit run --all-files

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: Lint
on:
  push:
    branches-ignore:
      - data
      - gh-pages
    tags:
      - '**'
  pull_request:
    branches-ignore:
      - data
      - gh-pages
  workflow_dispatch:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
 
  # Lint job. Runs pre-commit, fails if there are changed files
  # os, python version and architecture does not matter here
  # [${{ matrix.python-version }} | ${{ matrix.os }} ${{ matrix.architecture }}]
  lint:
    timeout-minutes: 30
    name: Check pre-commit 
    strategy:
      fail-fast: true
      matrix:
        os: [ubuntu-latest]
        python-version: ['3.13']
        architecture: [x64]
    runs-on: ${{ matrix.os }}
    env:
      PYTHONUNBUFFERED: 1
 
    steps:
    - name: Checkout
      uses: actions/checkout@v2
 
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        cache: 'pip'
        python-version: ${{ matrix.python-version }}
        architecture: ${{ matrix.architecture }}
 
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        python -m pip install --upgrade setuptools wheel
        python -m pip install --upgrade pre-commit
 
    - name: Check pre-commit
      run: pre-commit run --all-files

What changed

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

actions/checkout actions/setup-python