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Installation

Assisted installation

Just run npx mega-linter-runner --install at the root of your repository and answer questions, it will generate ready to use configuration files for Mega-Linter :)

Runner Install

Upgrade from Mega-Linter v4

  • Run npx mega-linter-runner --upgrade to automatically upgrade your configuration to v5 :)

Manual installation

The following instructions examples are using to latest Mega-Linter stable version (V4 , always corresponding to the latest release)

  • GitHub Action: megalinter/megalinter@v4
  • Docker image: megalinter/megalinter:v4

You can also use beta version (corresponding to the content of main branch)

  • GitHub Action: megalinter/megalinter@beta
  • Docker image: megalinter/megalinter:beta

GitHub Action

  1. Create a new file in your repository called .github/workflows/mega-linter.yml
  2. Copy the example workflow from below into that new file, no extra configuration required
  3. Commit that file to a new branch
  4. Open up a pull request and observe the action working
  5. Enjoy your more stable, and cleaner code base

NOTES:

  • If you pass the Environment variable GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} in your workflow, then the GitHub Mega-Linter will mark the status of each individual linter run in the Checks section of a pull request. Without this you will only see the overall status of the full run. There is no need to set the GitHub Secret as it is automatically set by GitHub, it only needs to be passed to the action.
  • You can also use it outside of GitHub Actions (CircleCI, Azure Pipelines, Jenkins, GitLab, or even locally with a docker run)

In your repository you should have a .github/workflows folder with GitHub Action similar to below:

  • .github/workflows/mega-linter.yml
This file should have this code 
---
# Mega-Linter GitHub Action configuration file
# More info at https://megalinter.github.io/
name: Mega-Linter

on:
  # Trigger mega-linter at every push. Action will also be visible from Pull Requests to main
  push: # Comment this line to trigger action only on pull-requests (not recommended if you don't pay for GH Actions)
  pull_request:
    branches: [main, main]

env: # Comment env block if you do not want to apply fixes
  # Apply linter fixes configuration
  APPLY_FIXES: all # When active, APPLY_FIXES must also be defined as environment variable (in github/workflows/mega-linter.yml or other CI tool)
  APPLY_FIXES_EVENT: pull_request # Decide which event triggers application of fixes in a commit or a PR (pull_request, push, all)
  APPLY_FIXES_MODE: commit # If APPLY_FIXES is used, defines if the fixes are directly committed (commit) or posted in a PR (pull_request)

jobs:
  # Cancel duplicate jobs: https://github.com/fkirc/skip-duplicate-actions#option-3-cancellation-only
  cancel_duplicates:
    name: Cancel duplicate jobs
    runs-on: ubuntu-latest
    steps:
      - uses: fkirc/skip-duplicate-actions@main
        with:
          github_token: ${{ secrets.PAT || secrets.GITHUB_TOKEN }}

  build:
    name: Mega-Linter
    runs-on: ubuntu-latest
    steps:
      # Git Checkout
      - name: Checkout Code
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.PAT || secrets.GITHUB_TOKEN }}
          fetch-depth: 0

      # Mega-Linter
      - name: Mega-Linter
        id: ml
        # You can override Mega-Linter flavor used to have faster performances
        # More info at https://megalinter.github.io/flavors/
        uses: megalinter/megalinter@v4
        env:
          # All available variables are described in documentation
          # https://megalinter.github.io/configuration/
          VALIDATE_ALL_CODEBASE: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }} # Validates all source when push on main, else just the git diff with main. Override with true if you always want to lint all sources
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          # ADD YOUR CUSTOM ENV VARIABLES HERE OR DEFINE THEM IN A FILE .mega-linter.yml AT THE ROOT OF YOUR REPOSITORY
          # DISABLE: COPYPASTE,SPELL # Uncomment to disable copy-paste and spell checks

      # Upload Mega-Linter artifacts
      - name: Archive production artifacts
        if: ${{ success() }} || ${{ failure() }}
        uses: actions/upload-artifact@v2
        with:
          name: Mega-Linter reports
          path: |
            report
            mega-linter.log

      # Create pull request if applicable (for now works only on PR from same repository, not from forks)
      - name: Create Pull Request with applied fixes
        id: cpr
        if: steps.ml.outputs.has_updated_sources == 1 && (env.APPLY_FIXES_EVENT == 'all' || env.APPLY_FIXES_EVENT == github.event_name) && env.APPLY_FIXES_MODE == 'pull_request' && (github.event_name == 'push' || github.event.pull_request.head.repo.full_name == github.repository) && !contains(github.event.head_commit.message, 'skip fix')
        uses: peter-evans/create-pull-request@v3
        with:
          token: ${{ secrets.PAT || secrets.GITHUB_TOKEN }}
          commit-message: "[Mega-Linter] Apply linters automatic fixes"
          title: "[Mega-Linter] Apply linters automatic fixes"
          labels: bot
      - name: Create PR output
        if: steps.ml.outputs.has_updated_sources == 1 && (env.APPLY_FIXES_EVENT == 'all' || env.APPLY_FIXES_EVENT == github.event_name) && env.APPLY_FIXES_MODE == 'pull_request' && (github.event_name == 'push' || github.event.pull_request.head.repo.full_name == github.repository) && !contains(github.event.head_commit.message, 'skip fix')
        run: |
          echo "Pull Request Number - ${{ steps.cpr.outputs.pull-request-number }}"
          echo "Pull Request URL - ${{ steps.cpr.outputs.pull-request-url }}"

      # Push new commit if applicable (for now works only on PR from same repository, not from forks)
      - name: Prepare commit
        if: steps.ml.outputs.has_updated_sources == 1 && (env.APPLY_FIXES_EVENT == 'all' || env.APPLY_FIXES_EVENT == github.event_name) && env.APPLY_FIXES_MODE == 'commit' && github.ref != 'refs/heads/main' && (github.event_name == 'push' || github.event.pull_request.head.repo.full_name == github.repository) && !contains(github.event.head_commit.message, 'skip fix')
        run: sudo chown -Rc $UID .git/
      - name: Commit and push applied linter fixes
        if: steps.ml.outputs.has_updated_sources == 1 && (env.APPLY_FIXES_EVENT == 'all' || env.APPLY_FIXES_EVENT == github.event_name) && env.APPLY_FIXES_MODE == 'commit' && github.ref != 'refs/heads/main' && (github.event_name == 'push' || github.event.pull_request.head.repo.full_name == github.repository) && !contains(github.event.head_commit.message, 'skip fix')
        uses: stefanzweifel/git-auto-commit-action@v4
        with:
          branch: ${{ github.event.pull_request.head.ref || github.head_ref || github.ref }}
          commit_message: "[Mega-Linter] Apply linters fixes"

Azure

Use the following Azure workflow template

You may activate File.io reporter or E-mail reporter to access detailed logs and fixed source

  - job: megalinter
    displayName: Mega-Linter
    pool:
      vmImage: ubuntu-latest
    steps:
    - script: |
        docker pull megalinter/megalinter:v4
        docker run -v $(System.DefaultWorkingDirectory):/tmp/lint megalinter/megalinter
      displayName: 'Code Scan using Mega-Linter'

Jenkins

Add the following stage in your Jenkinsfile

You may activate File.io reporter or E-mail reporter to access detailed logs and fixed source

// Lint with Mega-Linter: https://megalinter.github.io/
stage('Mega-Linter') {
    agent {
        docker {
            image 'megalinter/megalinter:v4'
            args "-e VALIDATE_ALL_CODEBASE=true -v ${WORKSPACE}:/tmp/lint --entrypoint=''"
            reuseNode true
        }
    }
    steps {
        sh '/entrypoint.sh'
    }
}

GitLab

Create or update .gitlab-ci.yml file at the root of your repository

# Mega-Linter GitLab CI job configuration file
# More info at https://megalinter.github.io/

mega-linter:
  stage: test
  # You can override Mega-Linter flavor used to have faster performances
  # More info at https://megalinter.github.io/flavors/
  image: megalinter/megalinter-python:v4
  script: [ "true" ]
  variables:
    # All available variables are described in documentation
    # https://megalinter.github.io/configuration/
    DEFAULT_WORKSPACE: $CI_PROJECT_DIR
    DEFAULT_BRANCH: main
    # ADD YOUR CUSTOM ENV VARIABLES HERE TO OVERRIDE VALUES OF .mega-linter.yml AT THE ROOT OF YOUR REPOSITORY
  artifacts:
    when: always
    paths:
      - report
    expire_in: 1 week

Screenshot

Concourse

Pipeline step

Use the following job.step in your pipeline template

Note: make sure you have job.plan.get step which gets repo containing your repository as shown in example

---

  - name: linting
    plan:
      - get: repo
      - task: linting
        config:
          platform: linux
          image_resource:
            type: docker-image
            source:
              repository: megalinter/megalinter
              tag: v4
          inputs:
            - name: repo
          run:
            path: bash
            args:
            - -cxe
            - |
              cd repo
              export DEFAULT_WORKSPACE=$(pwd)
              bash -ex /entrypoint.sh
              # doing this because concourse does not work as other CI systems
          # params:
            # PARALLEL: true
            # DISABLE: SPELL
            # APPLY_FIXES: all
            # DISABLE_ERRORS: true
            # VALIDATE_ALL_CODEBASE: true
            # DEFAULT_BRANCH: main

OR

Use it as reusable task

Create reusable concourse task which can be used with multiple pipelines

  1. Create task file task-linting.yaml
---
platform: linux
image_resource:
  type: docker-image
  source:
    repository: megalinter/megalinter
    tag: v4

inputs:
- name: repo

# uncomment this if you want reports as task output
# output:
# - name: reports
#   path: repo/report

run:
  path: bash
  args:
  - -cxe
  - |
    cd repo
    export DEFAULT_WORKSPACE=$(pwd)
    bash -ex /entrypoint.sh
  1. Use that task-linting.yaml task in pipeline

Note:

1. make sure task-linting.yaml is available in that repo input at root

2. task output is not shown here

resources:

  - name: linting
    plan:
      - get: repo
      - task: linting
        file: repo/task-linting.yaml
        # params:
        #   PARALLEL: true
        #   DISABLE: SPELL
        #   APPLY_FIXES: all
        #   DISABLE_ERRORS: true
        #   VALIDATE_ALL_CODEBASE: true
        #   DEFAULT_BRANCH: main

Run Mega-Linter locally

Version Downloads/week Downloads/total

You can use mega-linter-runner to locally run Mega-Linter with the same configuration defined in .mega-linter.yml file

See mega-linter-runner installation instructions

Example

npx mega-linter-runner --flavor salesforce -e 'ENABLE=,DOCKERFILE,MARKDOWN,YAML' -e 'SHOW_ELAPSED_TIME=true'

Note: You can also use such command line from your custom CI/CD pipelines