autotagger.yml

name: Monorepo Auto-tagger

on:
  push:
    branches:
      - trunk
      - prerelease
      - '*/branch-*'

jobs:
  tag:
    name: Tag
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Fetch tags, shallowly and blobless
        run: |
          git fetch --depth=1 --filter=blob:none origin 'refs/tags/*:refs/tags/*'

      - name: Determine needed tags
        id: get-tags
        run: |
          REF=${GITHUB_REF#refs/heads/}
          if [[ "$REF" == */branch-* ]]; then
            PROJECTS="$(jq -r --arg P "${REF%%/branch-*}" '.extra["release-branch-prefix"] | if type == "array" then . else [ . ] end | if index( $P ) then input_filename | match( "^projects/([^/]+/[^/]+)/composer.json$" ).captures[0].string else empty end' projects/*/*/composer.json)"
            if [[ -n "$PROJECTS" ]]; then
              echo "Branch $REF seems to be a release branch, checking matching projects."
            else
              echo "::notice::Branch $REF seems to be a release branch, but nothing uses that prefix so not checking any projects."
              echo "any=false" >> "$GITHUB_OUTPUT"
              exit 0
            fi
          else
            PROJECTS="$(jq -r 'if .extra["release-branch-prefix"] then empty else input_filename | match( "^projects/([^/]+/[^/]+)/composer.json$" ).captures[0].string end' projects/*/*/composer.json)"
            if [[ -n "$PROJECTS" ]]; then
              echo "Branch $REF is not a release branch, checking only projects without a release-branch-prefix."
            else
              echo "::notice::Branch $REF is not a release branch, but somehow no projects lack a release-branch-prefix?"
              echo "any=false" >> "$GITHUB_OUTPUT"
              exit 0
            fi
          fi

          TAGS=()
          while IFS= read -r SLUG; do
            echo "Checking $SLUG..."
            cd "$GITHUB_WORKSPACE/projects/$SLUG"

            CHANGES_DIR=$(jq -r '.extra.changelogger["changes-dir"] // "changelog"' composer.json)
            if [[ ! -d "$CHANGES_DIR" || -n "$(ls -- "$CHANGES_DIR")" ]]; then
              echo " Project $SLUG has changes in projects/$SLUG/$CHANGES_DIR/, not tagging."
              continue
            fi

            VER=$(sed -nEe 's/^## \[?([^]]*)\]? - .*/\1/;T;p;q' CHANGELOG.md || true)
            echo " Version from changelog is ${VER:-<unknown>}"
            if [[ "$VER" =~ ^[0-9]+(\.[0-9]+)+$ ]]; then
              if [[ -n "$( git tag -l "$SLUG@$VER" )" ]]; then
                echo " Version $VER is already tagged"
              else
                echo " Version $VER ok to tag"
                TAGS+=( "$SLUG@$VER" )
              fi
            else
              echo " Not tagging version $VER"
            fi
          done <<<"$PROJECTS"

          if [[ ${#TAGS[@]} -eq 0 ]]; then
            echo "::notice::Nothing to tag."
            echo "any=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          printf "%s\n" "${TAGS[@]}" > "$GITHUB_WORKSPACE/to-tag.txt"
          echo "any=true" >> "$GITHUB_OUTPUT"

      - name: Wait for prior instances of the workflow to finish
        if: steps.get-tags.outputs.any == 'true'
        uses: ./.github/actions/turnstile
        with:
          # Tagging should be reasonably quick, so poll more frequently.
          poll-interval: 15

      - name: Fetch tags, shallowly and blobless
        if: steps.get-tags.outputs.any == 'true'
        run: |
          git fetch --force --depth=1 --filter=blob:none origin 'refs/tags/*:refs/tags/*'

      - name: Tag projects
        if: steps.get-tags.outputs.any == 'true'
        run: |
          export GIT_AUTHOR_NAME=matticbot
          export GIT_AUTHOR_EMAIL=matticbot@users.noreply.github.com
          export GIT_COMMITTER_NAME=matticbot
          export GIT_COMMITTER_EMAIL=matticbot@users.noreply.github.com

          EXIT=0
          echo "Creating tags..."
          TOPUSH=()
          while IFS= read -r T; do
            if git tag "$T"; then
              TOPUSH+=( "$T" )
            fi
          done < "$GITHUB_WORKSPACE/to-tag.txt"

          if [[ ${#TOPUSH[@]} -gt 0 ]]; then
            echo "Pushing tags..."
            # GitHub has a limit on the number of tags that can be updated in a single push. So do them in batches.
            # See https://github.blog/changelog/2022-06-15-block-potentially-destructive-git-pushes/
            DONE=()
            while [[ ${#TOPUSH[@]} -gt 0 ]]; do
              BATCH=( "${TOPUSH[@]:0:5}" )
              if git push origin "${BATCH[@]}"; then
                DONE+=( "${BATCH[@]}" )
              else
                echo "::error::Failed to create tags: ${BATCH[*]}"
                EXIT=1
              fi
              TOPUSH=( "${TOPUSH[@]:5}" )
            done
            if [[ ${#DONE[@]} -gt 0 ]]; then
              echo "::notice::Created tags: ${DONE[*]}"
            fi
          else
            echo "::notice::No tags needed creation."
          fi
          exit $EXIT