action.yml

name: 'Update self as submodule'
description: 'Update itself as a submodule, and create PR on parent repo'
author: 'RevolveNTNU'

inputs:

  self_dot_git: 
    description: 'Name of .git-file for the current repo'
    required: true

  name: 
    description: 'Name to use in text, e.g. PR title ect.'
    required: false
    default: 'Submodule'

  pat_token:
    description: 'PAT token valid on parent repo'
    required: true

  pr_branch_name:
    description: 'Name of branch to create on parent. Run ID will be appended'
    required: false
    default: 'dependencies/submodule-update'

  target_branch:
    description: 'Target branch on parent'
    required: true
  
  checkout_branch:
    description: 'Name of branch on self to checkout and pull'
    required: false
    default: 'master'

  parent_repository:
    description: 'Parent repository, WITHOUT owner prefix'
    required: true

  owner:
    description: 'Owner of the parent repo'
    required: true

  label:
    description: 'Label to use on PR'
    required: false
    default: 'dependencies 🛎️'
  
runs:
  using: 'composite'
  steps:
      - name: "Set environmental variables"
        shell: bash
        run: |
          echo "ID=${GITHUB_RUN_ID}" >> $GITHUB_ENV
          echo "BRANCH=${{ inputs.pr_branch_name }}-${GITHUB_RUN_ID}" >> $GITHUB_ENV

      - name: Checkout Code
        uses: actions/checkout@v3
        with:
          repository: "${{ inputs.owner }}/${{ inputs.parent_repository }}"
          ref: ${{ inputs.target_branch }}
          submodules: true
          token: ${{ inputs.pat_token }}
      
      - name: Update submodule
        shell: bash
        run: |
          git config --global --add safe.directory "$GITHUB_WORKSPACE"
          git config user.name github-actions
          git config user.email github-actions@github.com
          cd $(git config --file .gitmodules --get-regexp url | grep ${{ inputs.self_dot_git }} | sed -e "s/^submodule.//" -e "s/\.url.*//")
          git checkout ${{ inputs.checkout_branch }}
          git pull
          cd -
 
      - name: Commit and push
        shell: bash
        run: |
          git checkout -b ${{ env.BRANCH }}
          git add .
          git commit -m "Update ${{ inputs.name }}"
          git push --set-upstream origin ${{ env.BRANCH }}
      
      - name: Create pull request against target branch
        uses: actions/github-script@v5
        with:
          github-token: ${{ inputs.pat_token }}
          script: |
            await github.rest.pulls.create({
              owner: '${{ inputs.owner }}',
              repo: '${{ inputs.parent_repository }}',
              head: '${{ env.BRANCH }}',
              base: '${{ inputs.target_branch }}',
              title: `[Auto-generated] ${{ inputs.name }} updates ${{ env.ID }}`,
              body: `Update the ${{ inputs.name }}-submodule to latest master`,
            });

      - name: Add labels
        uses: actions/github-script@v5
        with:
          github-token: ${{ inputs.pat_token }}
          script: |
            const res = await github.rest.issues.listForRepo({
              owner: '${{ inputs.owner }}',
              repo: '${{ inputs.parent_repository }}',
            });
            const pr = res.data.filter(i => i.title.includes(process.env.GITHUB_RUN_ID));
            const prNumber = pr[0].number;  
            await github.rest.issues.addLabels({
              issue_number: prNumber,
              owner: '${{ inputs.owner }}',
              repo: '${{ inputs.parent_repository }}',
              labels: ['${{ inputs.label }}']
            });