git-subtree-action

The source for the git-subtree github action.

About

This repository contains the source code for the git-subtree action that allows you to easily keep a git subtree in sync using the actions pipeline.

Usage

Action Inputs

Input	Description
repo	Child repository to sync the subtree to (eg. owner/repository.)
path	Path prefix in parent repo to split into child subtree (eg. src/PackageName.)
deploy_key	Deployment (public) SSH key for pushing to child repo (use deployment tokens for single repos or bot accounts for multi-repos/orgs.)
tag	Create (or mirror) a tag on the child subtree repository (branch or tag ref that triggered the workflow when true.)
force	Force push to the child subtree repository (recommended for pure downstream mirrors.)
branch	Branch of child subtree repository (default is branch or tag ref that triggered the workflow.)

Workflow Examples

This example uses a matrix to sync a list of namespaces into child subtree repos.

name: subtree-matrix

on: [push]

jobs:
  sync-downstream:

    runs-on: ubuntu-latest

    strategy:
      fail-fast: false
      matrix:
        path:
          - command
          - database
          - support

    name: Update downstream ${{ matrix.path }} package

    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
      - uses: lostlink/git-subtree-action@v1
        with:
          repo: 'lostlink/${{ matrix.path }}'
          path: 'src/${{ matrix.path }}'
          deploy_key: ${{ secrets.DOWNSTREAM_GITHUB_DEPLOY_KEY }}
          force: true # will force push to the downstream repository

Syncing tags

You can also keep tags/releases in sync by using the tag input option.

name: subtree-package

on:
  release:
    types: [published]

jobs:
  sync-downstream:

    runs-on: ubuntu-latest

    name: Update downstream repository

    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
      - uses: lostlink/git-subtree-action@v1
        with:
          repo: 'lostlink/my-fancy-package'
          path: 'packages/fancy-package'
          deploy_key: ${{ secrets.DOWNSTREAM_GITHUB_DEPLOY_KEY }}
          tag: true # will use the tag name from the event if true is specified