github-action-templates 0.0.4

Template GitHub Actions

Github Action Templates

Github Action Templates is a tool that allows for templating of yaml files to compose a github action. This allows for re-use of jobs, steps and events.

Quick Start

Create a new directory for your templates.

mkdir -p .action_templates/{jobs,steps,events}

Templated jobs should go in the jobs directory.

# .action_templates/jobs/hello-world.yaml
HelloWorld:
  if: success()
  runs-on: ubuntu-latest

Note:

• steps can be ommited if you are also providing a additional steps templates.
• There should be a single job per file.

Templated steps go under the steps directory.

The contents of this file should be a yaml array with the step items to be templated.

# .action_templates/steps/python-setup.yaml
- uses: actions/setup-python@v2
  with:
    python-version: '3.6'
- run: pip install -r requirements.txt
- run: python my-script.py

Note

• The steps key is ommited, we just provide the contents.

Templated events go in the events directory

# .action_templates/events/on-pull-request-master.yaml
pull_request:
  branches:
    - master

Create the Template file to pull everything together

# .action_templates/my-github-action.yaml
name: "My Github Action"
jobs:
  - template: hello-world
    if: success()
    steps:
    - template: python-setup
      if: always()
events:
  - template: on-pull-request-master

Generate the template

python main.py -t .action_templates/my-github-action.yaml

The generated contents will be

name: My Github Action
on:
  pull_request:
    branches:
    - master
jobs:
  HelloWorld:
    if: success()
    runs-on: ubuntu-latest
    steps:
    # template: python-setup
    - uses: actions/setup-python@v2
      with:
        python-version: '3.6'
      if: always()
    - run: pip install -r requirements.txt
      if: always()
    - run: python my-script.py
      if: always()

Alternatively, install the python package and use the provided library in your applications.

pip install .

python

>>> from ghat.template import template_github_action
>>> template_github_action(".action_templates/my-github-action.yaml")
{'name': 'My Github Action', 'on': {'pull_request': ordereddict([('branches', ['master'])])}, 'jobs': {'HelloWorld': ordereddict([('if', 'success()'), ('runs-on', 'ubuntu-latest'), ('steps', [ordereddict([('uses', 'actions/setup-python@v2'), ('with', ordereddict([('python-version', '3.6')])), ('if', 'always()')]), ordereddict([('run', 'pip install -r requirements.txt'), ('if', 'always()')]), ordereddict([('run', 'python my-script.py'), ('if', 'always()')])])])}}
>>>

Structure of the template file

Field	Type	Description	Sample Value
name	String	Name of the GitHub Action.	My Github Action
jobs	Array	Array of jobs which the Github Action will contain
jobs[n].template	String	Location of the file to the template file.	.action_templates/jobs/hello-world.yaml
jobs[n].if	String	Contents of the if: condition that will be used for this job.	github.event.pull_request.head.repo.full_name == '<some-value>'
jobs[n].steps	Array	Array of step template objects
jobs[n].steps[n].template	String	Location of the file to the template file.	python-setup
jobs[n].steps[n].if	String	Contents of the if: condition that will be used for all steps in this template.	always()
events	Array	Array of events, these correspond to the on section of a workflow file.
events[n].template	String	Full or relative path to the template file. Can be just the name if the default location (.action_templates/events) is used.	on-pull-request-master

Note on file locations.

File location can be the absolute or relative path of a file. An optional argument is accepted to the template_github_action. This accepts a directory to search for template files. Just the name of the file can be provided if it exists within this directory and has a .yml or .yaml extension.

A url can also be used as long as the response contains valid yaml. E.g. https://raw.githubusercontent.com/mongodb/mongodb-kubernetes-operator/master/.action_templates/jobs/tests.yaml