cache.yaml

name: cache
on:
  push:
    branches: ["main"]
  workflow_dispatch:
# tl;dr;
# push will diff with cache, and dispatch workflow.
# workflow_dispatch without any repo change will use cache, and not dispatch workflow.
env:
  DISPATCH_REPO: guitarrapc/testtest
  DIPATCH_WORKFLOW_NAME: test
  DISPATCH_BRANCH: main
  CACHE_VERSION: v1
jobs:
  detect_library_change:
    runs-on: ubuntu-latest
    outputs:
      cache-hit: ${{ steps.cache-sha.outputs.cache-hit }}
    timeout-minutes: 10
    steps:
      - name: Dump GitHub context
        run: echo "$CONTEXT"
        env:
          CONTEXT: ${{ toJson(github) }}
      # get trigger repo references
      - name: public repo reference
        uses: actions/github-script@v3
        id: set-public-result
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            const result = await github.git.getRef({
              owner: context.repo.owner,
              repo: "githubactions-lab",
              ref: "heads/main"
            })
            console.log(result)
            return result.data.object.sha
      - run: echo "${{ steps.set-public-result.outputs.result }}"
      - name: private repo reference
        uses: actions/github-script@v3
        id: set-private-result
        with:
          github-token: ${{ secrets.SYNCED_GITHUB_TOKEN_REPO }} # must be PAT
          script: |
            const result = await github.git.getRef({
              owner: context.repo.owner,
              repo: "testtest",
              ref: "heads/main"
            })
            console.log(result)
            return result.data.object.sha
      - run: echo "${{ steps.set-private-result.outputs.result }}"
      # write all repo's sha to single file
      - name: gen sha hash
        run: |
          mkdir ./cache/
          cat <<EOF > ./cache/sha.txt
          ${{ steps.set-public-result.outputs.result }}
          ${{ steps.set-private-result.outputs.result }}
          EOF
      # cache validation if sha's file has been updated
      - name: Cache sha
        id: cache-sha
        uses: actions/cache@v2
        with:
          path: ~/cache
          key: ${{ runner.os }}-${{ env.CACHE_VERSION }}-sha-${{ hashFiles('**/sha.txt') }}
  dispatch:
    needs: [detect_library_change]
    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && needs.detect_library_change.outputs.cache-hit != 'true'
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      # dispatch build if cache is not match with previous
      - uses: benc-uk/workflow-dispatch@v1.1
        with:
          repo: ${{ env.DISPATCH_REPO }}
          ref: ${{ env.DISPATCH_BRANCH }}
          workflow: ${{ env.DIPATCH_WORKFLOW_NAME }}
          token: ${{ secrets.SYNCED_GITHUB_TOKEN_REPO }}