name: Update

on:
  schedule:
    - cron: '0 14 * * 1'
  workflow_dispatch:

jobs:
  update:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Install xmllint
        run: |
          sudo apt-get update
          sudo apt-get install libxml2-utils
      - name: Update nbdkit bindings from libguestfs.org releases
        run: |
          #!/usr/bin/env bash
          RELEASES=$(curl --silent https://download.libguestfs.org/nbdkit/ | xmllint --html --noblanks --xpath "/html/body/table/tr[td/img/@alt = '[DIR]']/td[a/.]/a/text()" -)
          git config --global user.email "marnold@redhat.com"
          git config --global user.name "Matthew Arnold"
          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}
          git pull --all --set-upstream
          for release in ${RELEASES}
          do
            release=${release%?}
            TARBALLS=$(curl --silent https://download.libguestfs.org/nbdkit/$release/ | xmllint --html --noblanks --xpath "/html/body/table/tr/td[contains(a/@href, '.tar.gz') and not(contains(a/@href, '.tar.gz.sig'))]/a/@href" -) || true
            for tarball in ${TARBALLS}
            do
              IFS=\"$IFS read href tarball suffix <<< $tarball # Intentionally overwrite tarball
              IFS="-.$IFS" read nbdkit major minor build suffix <<< $tarball
              if (($major \* 100000000 + $minor \* 10000 + $build \< 100190009))
              then # Go bindings added in 1.19.9
                  echo Ignoring release older than 1.19.9: $release/$tarball
                  echo
                  continue
              fi
              latestrelease=$release
              version=$major.$minor.$build
              tag=v$major.$minor.$build
              echo Branch: $release Tar: $tarball Tag: $tag
              if git rev-parse --verify $tag
              then
                echo Already present in repository: $tag
              else
                if ! (git rev-parse --verify $release || git rev-parse --verify origin/$release)
                then
                  echo Creating new branch: $release
                  root=$(git rev-list --max-parents=0 HEAD)
                  git checkout $root
                  git checkout -b $release
                else
                  echo Checking out existing branch: $release
                  git checkout $release
                fi
                echo Updating $release branch with new version $version
                curl --silent https://download.libguestfs.org/nbdkit/$release/$tarball | tar -xzv --strip-components=6 nbdkit-$version/plugins/golang/src/libguestfs.org/nbdkit/
                rm -f .gitignore
                git add --all
                git diff-index --quiet HEAD || git commit -m "Import nbdkit-$version"
                git tag $tag
              fi
              if git rev-parse --verify $tag-cdi
              then
                echo Already present in repository: $tag-cdi
              else
                if ! (git rev-parse --verify $release-cdi || git rev-parse --verify origin/$release-cdi)
                then    
                  echo Creating new branch: $release-cdi
                  root=$(git rev-list --max-parents=0 HEAD)
                  git checkout $root
                  git checkout -b $release-cdi
                else
                  echo Checking out existing branch: $release-cdi
                  git checkout $release-cdi
                fi
                git checkout $tag ./
                find . -type f -name '*.go' -exec sed -i 's/#cgo pkg-config: nbdkit/#cgo LDFLAGS: -lnbdkit/g' {} +
                git add --all
                git diff-index --quiet HEAD || git commit -m "Tweak nbdkit-$version for CDI build"
                git tag $tag-cdi
              fi
              echo
              echo
            done
          done
          
          latest=$(tail -n 1 <<< $latestrelease)
          git checkout main
          if git rev-parse --verify $latestrelease
          then
            echo Copy newest bindings from local $latest
            git checkout $latest ./ 
          elif git rev-parse --verify origin/$latestrelease
          then    
            echo Copy newest bindings from remote $latest
            git checkout origin/$latest ./
          else
            echo Latest branch not present in local or remote? Check libguestfs.org for unpopulated directory.
          fi
          git diff-index --quiet HEAD || git commit -m "Update latest nbdkit bindings."
          git push --all -u
          git push --tags