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##
## This workflow handles testing of pull requests and pushes.
## It also publishes some packages to any new Erlang/OTP release
##
## To speed this up it would be nice if one could share docker
## images inbetween different jobs, but at the moment this is
## not possible so we need to rebuild all of Erlang/OTP multiple
## times.
##
## Also once the windows runner supports WSL we should implement
## support for building Erlang/OTP here.
##
## When ghcr.io support using the GITHUB_TOKEN we should migrate
## over to use it instead as that should allow us to use the
## built-in caching mechanisms of docker/build-push-action@v2.
## However as things are now we use docker directly to make things
## work.
##

name: Build and check Erlang/OTP

on:
  push:
  pull_request:

jobs:

  pack:
    name: Pack the Erlang/OTP tar.gz
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Commit autoconf files
        ## We first commit the autoconf generate so that they
        ## are kept in the pre-built achive
        run: |
          ./otp_build autoconf
          find . -name aclocal.m4 | xargs git add -f
          find . -name configure | xargs git add -f
          find . -name config.h.in | xargs git add -f
          find . -name config.guess | xargs git add -f
          find . -name config.sub | xargs git add -f
          find . -name install-sh | xargs git add -f
          git config --global user.email "you@example.com"
          git config --global user.name "Your Name"
          git commit --no-verify -m 'Add generated configure files'
      - name: Archive git repository
        run: git archive --prefix otp/ -o otp_src.tar.gz HEAD
      - name: Upload source tar archive
        uses: actions/upload-artifact@v2
        with:
          name: otp_git_archive
          path: otp_src.tar.gz

  build:
    name: Build Erlang/OTP
    runs-on: ubuntu-latest
    needs: pack

    strategy:
      matrix:
        type: [64-bit,32-bit,cross-compile,documentation]
      fail-fast: false

    steps:
      - uses: actions/checkout@v2
      - name: Download source archive
        uses: actions/download-artifact@v2
        with:
          name: otp_git_archive
      - name: Docker login
        uses: docker/login-action@v1
        with:
          registry: docker.pkg.github.com
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Calculate BASE image
        id: base
        run: |
          BASE_TAG=$(grep "^FROM" .github/dockerfiles/Dockerfile.${{ matrix.type }} | head -1 | awk '{print $2}')
          echo "::set-output name=BASE_TAG::${BASE_TAG}"
          .github/scripts/base-tag "${BASE_TAG}"
      - name: Pull BASE image
        run: docker pull ${{ steps.base.outputs.BASE_TAG }}
      - name: Build BASE image
        run: |
          docker build --pull --tag ${{ steps.base.outputs.BASE_TAG }} \
            --cache-from ${{ steps.base.outputs.BASE_TAG }} \
            --file .github/dockerfiles/Dockerfile.${{ steps.base.outputs.BASE_TYPE }} \
            --build-arg BASE=${{ steps.base.outputs.BASE }} .
      - name: Build ${{ matrix.type }} image
        run: |
          docker build --tag otp --file .github/dockerfiles/Dockerfile.${{ matrix.type }} \
            --build-arg ARCHIVE=otp_src.tar.gz .

        ## Smoke build tests
      - if: matrix.type == '32-bit' || matrix.type == '64-bit' || matrix.type == 'cross-compile'
        name: Run smoke test
        run: docker run -v $PWD/scripts:/scripts otp "cd /tests && /scripts/run-smoke-tests"

        ## Documentation checks
      - if: matrix.type == 'documentation'
        name: Run xmllimt
        run: docker run otp "make xmllint"
      - if: matrix.type == 'documentation'
        name: Run html link check
        run: docker run -v $PWD/scripts:/scripts otp "/scripts/otp_html_check /otp doc/index.html"
      - if: matrix.type == 'documentation'
        name: Release docs to publish
        run: |
          docker run -v $PWD/:/github otp "make release_docs DOC_TARGETS='man html pdf' RELEASE_ROOT=/github/docs"
          sudo chown -R `whoami` docs
          cd docs
          tar czf ../otp_doc_man.tar.gz man
          rm -rf man
          tar czf ../otp_doc_html.tar.gz *
      - if: matrix.type == 'documentation'
        name: Upload html documentation archive
        uses: actions/upload-artifact@v2
        with:
          name: otp_doc_html
          path: otp_doc_html.tar.gz
      - if: matrix.type == 'documentation'
        name: Upload man documentation archive
        uses: actions/upload-artifact@v2
        with:
          name: otp_doc_man
          path: otp_doc_man.tar.gz

        ## Run dialyzer
      - if: matrix.type == '64-bit'
        name: Run dialyzer
        run: docker run -v $PWD/scripts:/scripts otp "/scripts/run-dialyzer"

        ## Build pre-built tar archives
      - if: matrix.type == '32-bit'
        name: Build pre-built tar archives
        run: |
          docker run -v $PWD:/github otp \
          "scripts/build-otp-tar -o /github/otp_clean_src.tar.gz /github/otp_src.tar.gz -b /buildroot/otp/ /buildroot/otp.tar.gz"
      - if: matrix.type == '32-bit'
        name: Upload pre-built tar archive
        uses: actions/upload-artifact@v2
        with:
          name: otp_prebuilt
          path: otp_src.tar.gz

  ## If this is a tag that has been pushed we do some release work
  release:
    name: Release Erlang/OTP
    runs-on: ubuntu-latest
    needs: build
    if: startsWith(github.ref, 'refs/tags/') && github.repository == 'erlang/otp'
    steps:
      ## This step outputs the tag name and whether the tag is a release or patch
      ## (all releases have only two version identifiers, while patches have three
      ##  or more)
      - name: Get Tag Name
        id: tag
        run: |
          TAG=${GITHUB_REF#refs/tags/}
          VSN=${TAG#OTP-}
          IS_RELEASE=`$(echo $TAG | grep -E '^OTP-[0-9]+\.[0-9]+$' > /dev/null) \
            && echo "true" || echo "false"`
          echo "::set-output name=tag::${TAG}"
          echo "::set-output name=vsn::${VSN}"
          echo "::set-output name=release::${IS_RELEASE}"
      
      - uses: actions/checkout@v2

      ## Publish the pre-built archive and docs
      - name: Download source archive
        uses: actions/download-artifact@v2
        with:
          name: otp_prebuilt
      - name: Download html docs
        uses: actions/download-artifact@v2
        with:
          name: otp_doc_html
      - name: Download man docs
        uses: actions/download-artifact@v2
        with:
          name: otp_doc_man

      ## We add the correct version name into the file names
      ## and create the hash files for all assets
      - name: Create pre-build and doc archives
        run: |
          mkdir artifacts
          tar -xzf otp_src.tar.gz
          mv otp otp_src_${{ steps.tag.outputs.vsn }}
          tar -czf artifacts/otp_src_${{ steps.tag.outputs.vsn }}.tar.gz otp_src_${{ steps.tag.outputs.vsn }}
          mv otp_doc_man.tar.gz artifacts/otp_doc_man_${{ steps.tag.outputs.vsn }}.tar.gz
          mv otp_doc_html.tar.gz artifacts/otp_doc_html_${{ steps.tag.outputs.vsn }}.tar.gz

      - name: Build OTP Bundle
        if: steps.tag.outputs.release == 'true'
        run: |
          scripts/bundle-otp ${{ steps.tag.outputs.tag }}

      ## Create hash files
      - name: Create pre-build and doc archives
        run: |
          shopt -s nullglob
          cd artifacts
          md5sum {*.tar.gz,*.txt} > MD5.txt
          sha256sum {*.tar.gz,*.txt} > SHA256.txt

      - name: Upload pre-built and doc tar archives
        uses: softprops/action-gh-release@v1
        with:
          name: OTP ${{ steps.tag.outputs.vsn }}
          files: |
            artifacts/*.tar.gz
            artifacts/*.txt
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}