pull.yml

name: Check upstream for updates

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

jobs:
  pull:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Check for upstream code changes
        id: code-changes
        run: |
          codeURL="https://www.cs.auckland.ac.nz/~pgut001/dumpasn1.c"

          if ! curl -fsSL $codeURL -o dumpasn1.c ; then
          echo "Failed to download dumpasn1.c"
          exit 1
          fi

          if ! git diff --exit-code ; then
            echo "Changes detected in code"
            echo "detected=true" | tee -a "$GITHUB_OUTPUT"
          else
            echo "No changes detected in code"
            echo "detected=false" | tee -a "$GITHUB_OUTPUT"
          fi

      - name: Test compile
        if: steps.code-changes.outputs.detected == 'true'
        run: |
          gcc -o dumpasn1 dumpasn1.c
          rm dumpasn1

      - name: Detect new code version
        if: steps.code-changes.outputs.detected == 'true'
        id: code-version
        run: |
          updateRegex='#define UPDATE_STRING[[:blank:]]+"([[:alnum:][:blank:]]+)"'

          code=$(cat dumpasn1.c)

          if [[ ! $code =~ $updateRegex ]]; then
            echo "Update string not found in dumpasn1.c"
            exit 1
          fi

          update=${BASH_REMATCH[1]}
          echo "updated: $update"

          version=$(date -d"$update" +%Y%m%d)
          echo "version: $version"

          if ! grep -q "version ${version}" dumpasn1.c; then
            echo "Version ${version} not found in dumpasn1.c"
            exit 1
          fi

          echo "version=${version}" >> "$GITHUB_OUTPUT"

      - name: Update SHA256SUMS
        if: steps.code-changes.outputs.config == 'true'
        run: |
          sha256sum dumpasn1.c dumpasn1.cfg > SHA256SUMS

      - name: Commit code change
        if: steps.code-changes.outputs.detected == 'true'
        run: |
          git config --local user.email "49727155+katexochen@users.noreply.github.com"
          git config --local user.name "Paul Meyer"
          git add dumpasn1.c SHA256SUMS
          git commit -m "Update dumpasn1.c to ${version}"
          git diff --exit-code

      - name: Check for upstream config changes
        id: config-changes
        run: |
          cfgURL="https://www.cs.auckland.ac.nz/~pgut001/dumpasn1.cfg"

          if ! curl -fsSL $cfgURL -o dumpasn1.cfg ; then
            echo "Failed to download dumpasn1.cfg"
            exit 1
          fi

          if ! git diff --exit-code ; then
            echo "Changes detected in config"
            echo "config=true" | tee -a "$GITHUB_OUTPUT"
          else
            echo "No changes detected in config"
            echo "config=false" | tee -a "$GITHUB_OUTPUT"
          fi

      - name: Detect new config version
        if: steps.config-changes.outputs.config == 'true'
        id: config-version
        run: |
          updateRegex='([[:digit:]]{8}) if you want it that way.'

          config=$(cat dumpasn1.cfg)

          if [[ ! $config =~ $updateRegex ]]; then
            echo "Update string not found in dumpasn1.c"
            exit 1
          fi

          version=${BASH_REMATCH[1]}
          echo "version: $version"

          if [[ $(date -d"$version" +%Y%m%d) != "$version" ]]; then
            echo "Invalid date: $version"
            exit 1
          fi

          echo "version=${version}" >> "$GITHUB_OUTPUT"

      - name: Update SHA256SUMS
        if: steps.config-changes.outputs.config == 'true'
        run: |
          sha256sum dumpasn1.c dumpasn1.cfg > SHA256SUMS

      - name: Commit config change
        if: steps.config-changes.outputs.config == 'true'
        run: |
          git config --local user.email "49727155+katexochen@users.noreply.github.com"
          git config --local user.name "Paul Meyer"
          git add dumpasn1.cfg SHA256SUMS
          git commit -m "Update dumpasn1.cfg to ${version}"
          git diff --exit-code

      - name: Open PR
        if: steps.code-changes.outputs.detected == 'true' || steps.config-changes.outputs.config == 'true'
        uses: peter-evans/create-pull-request@v5
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          title: Update source
          body: ":robot: This PR was automatically created."
          branch: update
          branch-suffix: timestamp
          base: main