Automatic Dependency Update

Updating package dependencies automatically as a part of continuous integration (CI)

Dependabot

Dependabot creates a pull request once there is an update for the dependencies. The pull requests are usually tested by continuous integration (CI).

However, dependabot does not support automerging on its own due to security concerns. The good news is that we could use Kodiak to do the job. See it's quickstart if you are interested.

For example, the dependabot file .github/dependabot.yml

.github/dependabot.yml

version: 2

updates:
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "daily"
    labels:
    - "automerge"

Kodiak bot file: .github/.kodiak.toml

.github/.kodiak.toml

version = 1

[merge]
method = "squash"

And you need additional steps in the Github settings to make Kodiak Bot work

• Add the automerge tag in the GitHub issue tab.
• In Options -> Branches, protect the to-be-merged branch (usually the main branch)
• Also tick "Require status checks to pass before merging" and "Require branches to be up to date before merging"
• And select which github action job(s) should be passed in order to automerge by using the search bar below.

Renovate

Renovate bot can manage both dependency update checking and automated pull request merging.

It supports a variety of platforms

• GitHub (.com and Enterprise)
• GitLab (.com and CE/EE)
• Bitbucket Cloud / Servee
• Azure DevOps
• Gitea

And a variety of programming languages

• Git submodules
• GitHub actions
• Node JS packages
• Dockerfile
• Javascript (and node JS)
• Java
• And more

Setup for GitHub

Enable the Renovate GitHub APP for GitHub repositories. Renovate bot will open an pull request for reachable repos to begin an interactive setup.

Setup for GitLab

According to the renovate GitLab runner documentation,

1. Create a repository for the Renovate runner.
2. Add a GitLab personal access token (PAT) with read_user, api and write_repository scopes as the RENOVATE_TOKEN CI/CD variable,
3. Add a GitHub PAT as GITHUB_COM_TOKEN. This token allows renovate bot to read information of updated dependencies unhindered.
4. Create .gitlab-ci.yml to run the pipelines
   
   .gitlab-ci.yml

   include:
    - project: 'renovate-bot/renovate-runner'
      file: '/templates/renovate-dind.gitlab-ci.yml'
   

5. Select what repositories renovate bot could touch by setting up the CI/CD variable RENOVATE_EXTRA_FLAGS : --autodiscover=true --autodiscover-filter=group1/* or configure them in the config.js file.
   
   config.js

   module.exports = {
       repositories: [
           "group1/repo1",
           "group2/repo2",
       ],
   };
   

   
   As a plus, it's easier to set up more renovate runner options in the config.js file.
6. Setup a schedule for the pipeline.

Renovate settings file

The settings file renovate.json example

renovate.json

{
  "extends": [
    "config:recommended",
    ":automergeMajor"
  ],
  "git-submodules": {
      "enabled": true
  }
}

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