actions/csharp-build/action.yml

# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
# permissions:
#   - contents: read  # Required for checking out repository
---
name: C# Build
description: 'Builds and tests C# projects.'
author: 'Ismo Vuorinen'

branding:
  icon: 'code'
  color: 'blue'

inputs:
  dotnet-version:
    description: 'Version of .NET SDK to use.'
    required: false
  max-retries:
    description: 'Maximum number of retry attempts for dotnet restore operations'
    required: false
    default: '3'
  token:
    description: 'GitHub token for authentication'
    required: false
    default: ''

outputs:
  build_status:
    description: 'Build completion status (success/failure)'
    value: ${{ steps.build.outputs.status }}
  test_status:
    description: 'Test execution status (success/failure/skipped)'
    value: ${{ steps.test.outputs.status }}
  dotnet_version:
    description: 'Version of .NET SDK used'
    value: ${{ steps.detect-dotnet-version.outputs.detected-version }}
  artifacts_path:
    description: 'Path to build artifacts'
    value: '**/bin/Release/**/*'
  test_results_path:
    description: 'Path to test results'
    value: '**/*.trx'

runs:
  using: composite
  steps:
    - name: Checkout Repository
      uses: actions/checkout@71cf2267d89c5cb81562390fa70a37fa40b1305e # v6-beta
      with:
        token: ${{ inputs.token || github.token }}

    - name: Detect .NET SDK Version
      id: detect-dotnet-version
      shell: sh
      env:
        DEFAULT_VERSION: "${{ inputs.dotnet-version || '7.0' }}"
      run: |
        set -eu

        # Function to validate version format
        validate_version() {
          version=$1
          case "$version" in
            [0-9]* | [0-9]*\.[0-9]* | [0-9]*\.[0-9]*\.[0-9]*)
              return 0
              ;;
            *)
              return 1
              ;;
          esac
        }

        # Function to clean version string
        clean_version() {
          printf '%s' "$1" | sed 's/^[vV]//' | tr -d ' \n\r'
        }

        detected_version=""

        # Parse .tool-versions file
        if [ -f .tool-versions ]; then
          echo "Checking .tool-versions for dotnet..." >&2
          version=$(awk '/^dotnet[[:space:]]/ {gsub(/#.*/, ""); print $2; exit}' .tool-versions 2>/dev/null || echo "")
          if [ -n "$version" ]; then
            version=$(clean_version "$version")
            if validate_version "$version"; then
              echo "Found .NET version in .tool-versions: $version" >&2
              detected_version="$version"
            fi
          fi
        fi

        # Parse Dockerfile
        if [ -z "$detected_version" ] && [ -f Dockerfile ]; then
          echo "Checking Dockerfile for dotnet..." >&2
          version=$(grep -iF "FROM" Dockerfile | grep -F "dotnet:" | head -1 | \
            sed -n -E "s/.*dotnet:([0-9]+(\.[0-9]+)*)(-[^:]*)?.*/\1/p" || echo "")
          if [ -n "$version" ]; then
            version=$(clean_version "$version")
            if validate_version "$version"; then
              echo "Found .NET version in Dockerfile: $version" >&2
              detected_version="$version"
            fi
          fi
        fi

        # Parse devcontainer.json
        if [ -z "$detected_version" ] && [ -f .devcontainer/devcontainer.json ]; then
          echo "Checking devcontainer.json for dotnet..." >&2
          if command -v jq >/dev/null 2>&1; then
            version=$(jq -r '.image // empty' .devcontainer/devcontainer.json 2>/dev/null | sed -n -E "s/.*dotnet:([0-9]+(\.[0-9]+)*)(-[^:]*)?.*/\1/p" || echo "")
            if [ -n "$version" ]; then
              version=$(clean_version "$version")
              if validate_version "$version"; then
                echo "Found .NET version in devcontainer: $version" >&2
                detected_version="$version"
              fi
            fi
          else
            echo "jq not found; skipping devcontainer.json parsing" >&2
          fi
        fi

        # Parse global.json
        if [ -z "$detected_version" ] && [ -f global.json ]; then
          echo "Checking global.json..." >&2
          if command -v jq >/dev/null 2>&1; then
            version=$(jq -r '.sdk.version // empty' global.json 2>/dev/null || echo "")
            if [ -n "$version" ]; then
              version=$(clean_version "$version")
              if validate_version "$version"; then
                echo "Found .NET version in global.json: $version" >&2
                detected_version="$version"
              fi
            fi
          else
            echo "jq not found; skipping global.json parsing" >&2
          fi
        fi

        # Use default version if nothing detected
        if [ -z "$detected_version" ]; then
          detected_version="$DEFAULT_VERSION"
          echo "Using default .NET version: $detected_version" >&2
        fi

        # Set output
        printf 'detected-version=%s\n' "$detected_version" >> "$GITHUB_OUTPUT"
        echo "Final detected .NET version: $detected_version" >&2

    - name: Setup .NET SDK
      uses: actions/setup-dotnet@2016bd2012dba4e32de620c46fe006a3ac9f0602 # v5.0.1
      with:
        dotnet-version: ${{ steps.detect-dotnet-version.outputs.detected-version }}
        cache: true
        cache-dependency-path: '**/packages.lock.json'

    - name: Restore Dependencies
      uses: step-security/retry@e1d59ce1f574b32f0915e3a8df055cfe9f99be5d # v3.0.4
      with:
        timeout_minutes: 10
        max_attempts: ${{ inputs.max-retries }}
        command: |
          echo "Restoring .NET dependencies..."
          dotnet restore --verbosity normal

    - name: Build Solution
      id: build
      shell: sh
      run: |
        set -eu
        echo "Building .NET solution..."
        if dotnet build --configuration Release --no-restore --verbosity normal; then
          echo "status=success" >> "$GITHUB_OUTPUT"
          echo "Build completed successfully"
        else
          echo "status=failure" >> "$GITHUB_OUTPUT"
          echo "Build failed"
          exit 1
        fi

    - name: Run Tests
      id: test
      shell: sh
      run: |
        set -eu
        echo "Running .NET tests..."
        if find . -name "*.csproj" | xargs grep -lE "(Microsoft\.NET\.Test\.Sdk|xunit|nunit)" | head -1 | grep -q .; then
          if dotnet test --configuration Release --no-build \
            --collect:"XPlat Code Coverage" \
            --logger "trx;LogFileName=test-results.trx" \
            --verbosity normal; then
            echo "status=success" >> "$GITHUB_OUTPUT"
            echo "Tests completed successfully"
          else
            echo "status=failure" >> "$GITHUB_OUTPUT"
            echo "Tests failed"
            exit 1
          fi
        else
          echo "No test projects found, skipping test execution."
          echo "status=skipped" >> "$GITHUB_OUTPUT"
        fi

    - name: Upload Test Results
      if: always()
      uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
      with:
        name: csharp-test-results
        path: |
          **/*.trx
          **/TestResults/**/coverage.cobertura.xml
        if-no-files-found: ignore