check_consts_drift.yml

name: Check Celestia App Consts Drift
permissions:
  contents: read
  issues: write

on:
  workflow_dispatch:
  pull_request:

jobs:
  check_drift:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

      - name: Fetch Celestia App Consts
        id: fetch_celestia_consts
        run: |
          curl -sSL https://raw.githubusercontent.com/celestiaorg/celestia-app/main/pkg/appconsts/initial_consts.go -o /tmp/celestia_initial_consts.go
          if [ $? -ne 0 ]; then
            echo "Failed to download Celestia app consts file."
            exit 1
          fi
          echo "celestia_file_path=/tmp/celestia_initial_consts.go" >> $GITHUB_OUTPUT

      - name: Compare Files
        id: diff_files
        run: |
          LOCAL_FILE="da/jsonrpc/internal/consts.go" # Relative path from repo root
          CELESTIA_FILE="${{ steps.fetch_celestia_consts.outputs.celestia_file_path }}"

          if [ ! -f "$LOCAL_FILE" ]; then
            echo "Local consts.go file not found at $LOCAL_FILE"
            exit 1
          fi
          if [ ! -f "$CELESTIA_FILE" ]; then
            echo "Fetched Celestia consts file not found at $CELESTIA_FILE"
            # This should ideally be caught by the previous step's check
            exit 1
          fi

          echo "Comparing $LOCAL_FILE (excluding last line) with $CELESTIA_FILE (excluding last line)"

          LOCAL_FILE_TMP=$(mktemp)
          CELESTIA_FILE_TMP=$(mktemp)
          # Ensure temporary files are removed on exit
          trap 'rm -f "$LOCAL_FILE_TMP" "$CELESTIA_FILE_TMP"' EXIT

          head -n -1 "$LOCAL_FILE" > "$LOCAL_FILE_TMP"
          if [ $? -ne 0 ]; then
            echo "Error processing local file '$LOCAL_FILE' with head."
            exit 1
          fi
          head -n -1 "$CELESTIA_FILE" > "$CELESTIA_FILE_TMP"
          if [ $? -ne 0 ]; then
            echo "Error processing fetched Celestia file '$CELESTIA_FILE' with head."
            exit 1
          fi

          # Perform the diff and handle its exit code robustly
          diff_command_output=""
          if ! diff_command_output=$(diff -u "$LOCAL_FILE_TMP" "$CELESTIA_FILE_TMP"); then
            # diff exited with non-zero status
            diff_exit_code=$?
            if [ $diff_exit_code -eq 1 ]; then
              # Exit code 1 means files are different
              echo "Files are different (excluding last line)."
              echo "diff_output<<EOF" >> $GITHUB_OUTPUT
              echo "$diff_command_output" >> $GITHUB_OUTPUT
              echo "EOF" >> $GITHUB_OUTPUT
              echo "files_differ=true" >> $GITHUB_OUTPUT
              exit 1 # Fail the step
            else
              # Exit code > 1 means diff encountered an error
              echo "Error: diff command failed with exit code $diff_exit_code."
              echo "Diff command output/error: $diff_command_output"
              # Output error information for the issue
              echo "diff_output<<EOF" >> $GITHUB_OUTPUT
              echo "Diff command error (exit code $diff_exit_code):" >> $GITHUB_OUTPUT
              echo "$diff_command_output" >> $GITHUB_OUTPUT
              echo "EOF" >> $GITHUB_OUTPUT
              echo "files_differ=true" >> $GITHUB_OUTPUT # Treat as a difference to create an issue
              exit $diff_exit_code
            fi
          else
            # diff exited with 0, files are identical
            echo "Files are identical (excluding last line)."
            echo "files_differ=false" >> $GITHUB_OUTPUT
          fi