name: Mirror from SVN

on:
  push:

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

  schedule:
  - cron: '10 */10 * * *' # every hour to keep cache up to date

jobs:
  # This workflow contains a single job called "build"
  mirror:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest
    continue-on-error: true

    steps:

      - name: install git-svn package
        run: |
          sudo apt-get remove git git-man
          sudo apt-get update
          sudo apt-get install git-svn --no-install-recommends

      - name: checkout mirror config branch
        uses: actions/checkout@v3.5.2

      - name: Get current date as seconds
        id: get-date
        run: |
          echo "timestamp=$(/bin/date -u "+%Y%m%d%H" )" >> $GITHUB_OUTPUT

        shell: bash

      - name: generate merged authors file
        run: |
          ls -RLa ${GITHUB_WORKSPACE}
          cd /tmp
          mkdir -p ${GITHUB_WORKSPACE}/authors
          svn log https://svn.fhem.de/fhem --xml --quiet | grep author | sort -u | perl -pe 's/.*>(.*?)<.*/$1 = $1 <>/' > ${GITHUB_WORKSPACE}/authors_svn.txt;
          cat ${GITHUB_WORKSPACE}/authors.txt ${GITHUB_WORKSPACE}/authors_svn.txt | sort -u -k1,1 > ${GITHUB_WORKSPACE}/authors/authors_merged.txt;
          ls -la ${GITHUB_WORKSPACE}/authors/authors_merged.txt;         

      - name: create tmpfs for svn repo
        run: |
          mkdir -p ./src/fhem-mirror
          sudo mount -t tmpfs -o size=3G tmpfs ./src/fhem-mirror

      - name: Cache runners svn-2-git-fhem mirror directory  
        # Some room for improvement because we create a new cache on every run where a new ref is fetched, this isn't very nice, normaly weneed only the last one and it takes 7 days until they are deleted
        id: cache-fhem
        uses: actions/cache@v3.3.1
        with:
          path: ./src/fhem-mirror/.git
          key: ${{ runner.os }}-fhemsvndir-${{ steps.get-date.outputs.timestamp }}
          restore-keys: |
            ${{ runner.os }}-fhemsvndir-

      - name: list filesystem
        run: |
          df -h ./src/fhem-mirror

      - name: clean cache
        env:
          Clean_Cache: ${{ secrets.CLEANCACHE }}
        if: "${{ env.Clean_Cache == 'true' }}"
        run: |
          rm -r ./src/fhem-mirror/.git

      #- name: 'Tar files'
      #  run: tar -cvf ${GITHUB_WORKSPACE}/svnMirror.tar ./src/fhem-mirror/

      #- uses: actions/upload-artifact@v2
      #  with:
      #    name: mirror-artifact
      #    path: ./svnMirror.tar

      - name: init mirror repository if it is not already a mirror
        timeout-minutes: 1800
        run: |
          if [[ ! -d "${GITHUB_WORKSPACE}/src/fhem-mirror/.git" ]]; then
            git init "${GITHUB_WORKSPACE}/src/fhem-mirror" ;
            cd "${GITHUB_WORKSPACE}/src/fhem-mirror";
            git svn init --trunk=trunk --tags=tags --prefix=svn/ https://svn.fhem.de/fhem;
            git config --replace-all svn-remote.svn.preserve-empty-dirs "true" ;
            git config --replace-all svn-remote.svn.placeholder-filename ".gitkeep" ;
            git config --replace-all svn.authorsfile "${GITHUB_WORKSPACE}/authors/authors_merged.txt" ;
            # Run extra fetches after init, go pick up some base refs for the cache on first run only!
            timeout 900 git svn -q fetch || timeout 900 git svn -q fetch || timeout 900 git svn -q fetch || true
          else
            echo "Current .git/config file content:";
            cat ${GITHUB_WORKSPACE}/src/fhem-mirror/.git/config;
          fi

      - name: fetch svn to git master branch
        id: fetchsvn
        timeout-minutes: 1800
        run: |
          echo "SVN_FETCH_STATUS=incomplete" >> $GITHUB_OUTPUT
          cd "${GITHUB_WORKSPACE}/src/fhem-mirror";
          RET=0
          timeout 1800 git svn -q --log-window-size=5000 fetch || timeout 1500 git svn -q --log-window-size=5000 fetch || RET=$?;  
          if [[ $RET == 0 ]]; then
            git switch master
            git config --global user.email "actions@gitbhub.com"
            git config --global user.name "Github Actions"
            git reset --hard "remotes/svn/trunk"
            echo "SVN_FETCH_STATUS=complete" >> $GITHUB_OUTPUT
          elif [[ $RET != 124 ]]; then
            echo "SVN_FETCH_STATUS=error" >> $GITHUB_OUTPUT
          fi

      - name: Verify no fetch error state
        if: ${{ steps.fetchsvn.outputs.SVN_FETCH_STATUS == 'error' }}
        run: |
          echo "A permanent error occured"
          exit 1

      - name: Recreate tags from svn
        if: ${{ steps.fetchsvn.outputs.SVN_FETCH_STATUS == 'complete' }}
        working-directory: ./src/fhem-mirror
        run: |
           git for-each-ref --format="%(refname:lstrip=-1) %(objectname)" refs/remotes/svn/tags/FHEM_*_?  \
           | while read BRANCH REF
             do
               TAG_NAME=${BRANCH#FHEM_}
               TAG_NAME=$(echo $TAG_NAME | sed 's/_/./g')
               BODY="$(git log -1 --format=format:%B $REF)"
               echo "branch=$BRANCH ref=$REF parent=$(git rev-parse $REF^) tagname=$TAG_NAME body=$BODY" >&2
               git tag -a -f -m "$BODY" $TAG_NAME $REF^  
               # git branch -r -d origin/tags/$BRANCH
            done

      - name: push tags and commits into master branch (force)
        if: ${{ steps.fetchsvn.outputs.SVN_FETCH_STATUS == 'complete' }}
        working-directory: ./src/fhem-mirror
        run: |
          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }} || git remote add origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}
          git fetch --unshallow || true
          git push origin master --force --tags