deb-bootc-image-builder/docs/ci-cd-guide.md

# CI/CD Guide

## Overview

This document consolidates all Continuous Integration and Continuous Deployment (CI/CD) information for the Debian bootc-image-builder project. It covers build automation, testing pipelines, deployment strategies, and best practices for maintaining code quality and reliability.

## CI/CD Philosophy

### Principles

1. **Automation First**: Automate everything that can be automated
2. **Quality Gates**: No code merges without passing quality checks
3. **Fast Feedback**: Provide quick feedback on code changes
4. **Reproducible Builds**: Ensure consistent build environments
5. **Security First**: Integrate security scanning at every stage

### Goals

- **Build Time**: < 10 minutes for full pipeline
- **Test Coverage**: > 85% code coverage
- **Security**: Zero critical vulnerabilities
- **Reliability**: > 99% pipeline success rate
- **Deployment**: Automated deployment with rollback capability

## Pipeline Architecture

### Pipeline Stages

```
Code Commit → Build → Test → Security Scan → Deploy → Monitor
     ↓           ↓      ↓         ↓          ↓        ↓
   Git Hook   Docker  Unit/Int   SAST/DAST  Staging  Metrics
```

### Environment Strategy

1. **Development**: Local development and testing
2. **Staging**: Pre-production validation
3. **Production**: Live system deployment

## GitHub Actions Implementation

### Main Workflow

```yaml
name: CI/CD Pipeline

on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main, develop ]

env:
  GO_VERSION: '1.21'
  DOCKER_REGISTRY: ghcr.io
  IMAGE_NAME: debian-bootc-image-builder

jobs:
  # Quality Checks
  quality:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    
    - name: Set up Go
      uses: actions/setup-go@v4
      with:
        go-version: ${{ env.GO_VERSION }}
        cache: true
    
    - name: Install dependencies
      run: go mod download
    
    - name: Run linters
      run: |
        go vet ./...
        golangci-lint run
        gosec ./...
    
    - name: Check formatting
      run: |
        if [ "$(gofmt -s -l . | wc -l)" -gt 0 ]; then
          echo "Code is not formatted. Run 'go fmt ./...'"
          exit 1
        fi
    
    - name: Check for security issues
      run: |
        gosec -fmt=json -out=security-report.json ./...
        # Fail on high/critical issues
        jq -e '.Issues[] | select(.severity == "HIGH" or .severity == "CRITICAL") | empty' security-report.json

  # Testing
  test:
    runs-on: ubuntu-latest
    needs: quality
    strategy:
      matrix:
        go-version: ['1.20', '1.21']
        os: [ubuntu-latest, ubuntu-22.04]
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Set up Go
      uses: actions/setup-go@v4
      with:
        go-version: ${{ matrix.go-version }}
        cache: true
    
    - name: Install dependencies
      run: go mod download
    
    - name: Run unit tests
      run: |
        go test -v -race -coverprofile=coverage-${{ matrix.os }}.txt ./...
    
    - name: Run integration tests
      run: |
        go test -v -tags=integration ./...
    
    - name: Upload coverage
      uses: codecov/codecov-action@v3
      with:
        file: ./coverage-${{ matrix.os }}.txt
        flags: ${{ matrix.os }},${{ matrix.go-version }}

  # Build and Package
  build:
    runs-on: ubuntu-latest
    needs: test
    outputs:
      image-tag: ${{ steps.meta.outputs.tags }}
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v3
    
    - name: Log in to Container Registry
      uses: docker/login-action@v3
      with:
        registry: ${{ env.DOCKER_REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
    
    - name: Extract metadata
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: ${{ env.DOCKER_REGISTRY }}/${{ github.repository }}
        tags: |
          type=ref,event=branch
          type=ref,event=pr
          type=semver,pattern={{version}}
          type=semver,pattern={{major}}.{{minor}}
          type=sha,prefix={{branch}}-
    
    - name: Build and push Docker image
      uses: docker/build-push-action@v5
      with:
        context: .
        platforms: linux/amd64,linux/arm64
        push: true
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        cache-from: type=gha
        cache-to: type=gha,mode=max

  # Security Scanning
  security:
    runs-on: ubuntu-latest
    needs: build
    steps:
    - uses: actions/checkout@v4
    
    - name: Run Trivy vulnerability scanner
      uses: aquasecurity/trivy-action@master
      with:
        image-ref: ${{ env.DOCKER_REGISTRY }}/${{ github.repository }}:${{ needs.build.outputs.image-tag }}
        format: 'sarif'
        output: 'trivy-results.sarif'
    
    - name: Upload Trivy scan results
      uses: github/codeql-action/upload-sarif@v2
      with:
        sarif_file: 'trivy-results.sarif'

  # Deploy to Staging
  deploy-staging:
    runs-on: ubuntu-latest
    needs: [build, security]
    if: github.ref == 'refs/heads/develop'
    environment: staging
    
    steps:
    - name: Deploy to staging
      run: |
        echo "Deploying to staging environment..."
        # Add your staging deployment logic here
        # Example: kubectl apply, helm upgrade, etc.

  # Deploy to Production
  deploy-production:
    runs-on: ubuntu-latest
    needs: [build, security]
    if: github.ref == 'refs/heads/main'
    environment: production
    
    steps:
    - name: Deploy to production
      run: |
        echo "Deploying to production environment..."
        # Add your production deployment logic here
        # Example: kubectl apply, helm upgrade, etc.
```

### Pull Request Workflow

```yaml
name: Pull Request Checks

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  pr-checks:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    
    - name: Set up Go
      uses: actions/setup-go@v4
      with:
        go-version: '1.21'
        cache: true
    
    - name: Install dependencies
      run: go mod download
    
    - name: Run quick tests
      run: |
        go test -v -short ./...
    
    - name: Check code coverage
      run: |
        go test -coverprofile=coverage.txt ./...
        go tool cover -func=coverage.txt
    
    - name: Comment PR with coverage
      uses: romeovs/lcov-reporter-action@v0.3.0
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }}
        lcov-file: ./coverage.txt
```

## Local Development Setup

### Pre-commit Hooks

```bash
#!/bin/bash
# .git/hooks/pre-commit

set -e

echo "Running pre-commit checks..."

# Format code
echo "Formatting code..."
go fmt ./...

# Run linters
echo "Running linters..."
golangci-lint run

# Run tests
echo "Running tests..."
go test -v ./...

# Check for security issues
echo "Checking security..."
gosec ./...

echo "✅ Pre-commit checks passed"
```

### Development Scripts

```bash
#!/bin/bash
# scripts/dev-setup.sh

set -e

echo "Setting up development environment..."

# Install Go tools
go install github.com/golangci/golangci-lint/cmd/golangcici-lint@latest
go install github.com/securecodewarrior/gosec/v2/cmd/gosec@latest
go install github.com/fzipp/gocyclo/cmd/gocyclo@latest

# Install pre-commit hooks
cp scripts/pre-commit .git/hooks/
chmod +x .git/hooks/pre-commit

echo "✅ Development environment setup complete"
```

```bash
#!/bin/bash
# scripts/test-local.sh

set -e

echo "Running local test suite..."

# Run all tests
go test -v -race -coverprofile=coverage.txt ./...

# Generate coverage report
go tool cover -html=coverage.txt -o coverage.html

# Run security scan
gosec -fmt=json -out=security-report.json ./

echo "✅ Local test suite completed"
echo "📊 Coverage report: coverage.html"
echo "🔒 Security report: security-report.json"
```

## Docker Integration

### Multi-stage Dockerfile

```dockerfile
# Build stage
FROM golang:1.21-alpine AS builder

WORKDIR /app

# Install build dependencies
RUN apk add --no-cache git ca-certificates tzdata

# Copy go mod files
COPY go.mod go.sum ./
RUN go mod download

# Copy source code
COPY . .

# Build the application
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o bootc-image-builder ./cmd/bootc-image-builder

# Runtime stage
FROM debian:bookworm-slim

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    debos \
    qemu-user-static \
    && rm -rf /var/lib/apt/lists/*

# Create non-root user
RUN useradd -r -u 1000 -g 1000 -m bootc

# Copy binary from builder stage
COPY --from=builder /app/bootc-image-builder /usr/local/bin/

# Set ownership
RUN chown bootc:bootc /usr/local/bin/bootc-image-builder

# Switch to non-root user
USER bootc

# Set working directory
WORKDIR /workspace

# Expose ports (if needed)
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD bootc-image-builder version || exit 1

# Default command
CMD ["bootc-image-builder"]
```

### Docker Compose for Development

```yaml
# docker-compose.dev.yml
version: '3.8'

services:
  bootc-builder:
    build:
      context: .
      dockerfile: Dockerfile
      target: builder
    volumes:
      - .:/app
      - go-cache:/go
    working_dir: /app
    command: go run ./cmd/bootc-image-builder/main.go
    environment:
      - GO_ENV=development
      - DEBUG=true

  test-runner:
    build:
      context: .
      dockerfile: Dockerfile
      target: builder
    volumes:
      - .:/app
      - go-cache:/go
    working_dir: /app
    command: go test -v ./...
    environment:
      - GO_ENV=test

volumes:
  go-cache:
```

## Monitoring and Observability

### Metrics Collection

```go
// internal/metrics/metrics.go
package metrics

import (
    "github.com/prometheus/client_golang/prometheus"
    "github.com/prometheus/client_golang/prometheus/promauto"
)

var (
    BuildDuration = promauto.NewHistogramVec(
        prometheus.HistogramOpts{
            Name: "bootc_build_duration_seconds",
            Help: "Duration of image builds",
            Buckets: prometheus.DefBuckets,
        },
        []string{"image_type", "status"},
    )

    BuildSuccess = promauto.NewCounterVec(
        prometheus.CounterOpts{
            Name: "bootc_build_success_total",
            Help: "Total successful builds",
        },
        []string{"image_type"},
    )

    BuildFailures = promauto.NewCounterVec(
        prometheus.CounterOpts{
            Name: "bootc_build_failures_total",
            Help: "Total failed builds",
        },
        []string{"image_type", "error_type"},
    )
)
```

### Health Checks

```go
// internal/health/health.go
package health

import (
    "context"
    "net/http"
    "time"
)

type HealthChecker struct {
    checks map[string]Check
}

type Check func(ctx context.Context) error

func (h *HealthChecker) AddCheck(name string, check Check) {
    h.checks[name] = check
}

func (h *HealthChecker) HealthHandler(w http.ResponseWriter, r *http.Request) {
    ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
    defer cancel()

    status := make(map[string]string)
    healthy := true

    for name, check := range h.checks {
        if err := check(ctx); err != nil {
            status[name] = "unhealthy: " + err.Error()
            healthy = false
        } else {
            status[name] = "healthy"
        }
    }

    if healthy {
        w.WriteHeader(http.StatusOK)
    } else {
        w.WriteHeader(http.StatusServiceUnavailable)
    }

    // Return JSON response
    // ... implementation details
}
```

## Deployment Strategies

### Blue-Green Deployment

```yaml
# k8s/blue-green-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: bootc-builder-blue
spec:
  replicas: 3
  selector:
    matchLabels:
      app: bootc-builder
      version: blue
  template:
    metadata:
      labels:
        app: bootc-builder
        version: blue
    spec:
      containers:
      - name: bootc-builder
        image: ghcr.io/username/debian-bootc-image-builder:blue
        ports:
        - containerPort: 8080
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 5
```

### Canary Deployment

```yaml
# k8s/canary-deployment.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: bootc-builder-ingress
  annotations:
    nginx.ingress.kubernetes.io/canary: "true"
    nginx.ingress.kubernetes.io/canary-weight: "10"
spec:
  rules:
  - host: bootc-builder.example.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: bootc-builder-canary
            port:
              number: 80
```

## Security Integration

### SAST/DAST Scanning

```yaml
# .github/workflows/security-scan.yml
name: Security Scan

on:
  schedule:
    - cron: '0 2 * * *'  # Daily at 2 AM
  workflow_dispatch:

jobs:
  security-scan:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    
    - name: Run CodeQL Analysis
      uses: github/codeql-action/init@v2
      with:
        languages: go
    
    - name: Perform CodeQL Analysis
      uses: github/codeql-action/analyze@v2
    
    - name: Run OWASP ZAP Scan
      uses: zaproxy/action-full-scan@v0.8.0
      with:
        target: 'https://staging.example.com'
```

### Dependency Scanning

```yaml
# .github/workflows/dependency-scan.yml
name: Dependency Scan

on:
  schedule:
    - cron: '0 1 * * *'  # Daily at 1 AM
  workflow_dispatch:

jobs:
  dependency-scan:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    
    - name: Run Snyk to check for vulnerabilities
      uses: snyk/actions/go@master
      env:
        SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
      with:
        args: --severity-threshold=high
    
    - name: Run GOSEC security scanner
      run: |
        go install github.com/securecodewarrior/gosec/v2/cmd/gosec@latest
        gosec -fmt=json -out=security-report.json ./
```

## Performance Optimization

### Build Caching

```yaml
# .github/workflows/build-cache.yml
- name: Cache Go modules
  uses: actions/cache@v3
  with:
    path: |
      ~/.cache/go-build
      ~/go/pkg/mod
    key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
    restore-keys: |
      ${{ runner.os }}-go-

- name: Cache Docker layers
  uses: actions/cache@v3
  with:
    path: /tmp/.buildx-cache
    key: ${{ runner.os }}-buildx-${{ github.sha }}
    restore-keys: |
      ${{ runner.os }}-buildx-
```

### Parallel Job Execution

```yaml
# .github/workflows/parallel-jobs.yml
jobs:
  test-unit:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        go-version: ['1.20', '1.21']
    
  test-integration:
    runs-on: ubuntu-latest
    needs: test-unit
    
  security-scan:
    runs-on: ubuntu-latest
    # Run in parallel with tests
```

## Troubleshooting

### Common CI/CD Issues

#### Build Failures
```bash
# Check build logs
gh run view --log

# Re-run failed jobs
gh run rerun --failed

# Debug locally
docker run --rm -it -v $(pwd):/app -w /app golang:1.21 go build ./...
```

#### Test Failures
```bash
# Run specific test
go test -v -run TestFunctionName ./...

# Run with verbose output
go test -v -count=1 ./...

# Check test coverage
go test -coverprofile=coverage.txt ./...
go tool cover -html=coverage.txt
```

#### Deployment Issues
```bash
# Check deployment status
kubectl get deployments
kubectl describe deployment bootc-builder

# Check logs
kubectl logs -l app=bootc-builder

# Rollback deployment
kubectl rollout undo deployment/bootc-builder
```

## Best Practices

### Code Quality
1. **Automated Testing**: Run tests on every commit
2. **Code Coverage**: Maintain > 85% coverage
3. **Static Analysis**: Use multiple linting tools
4. **Security Scanning**: Integrate security checks early

### Pipeline Design
1. **Fast Feedback**: Fail fast on critical issues
2. **Parallel Execution**: Run independent jobs concurrently
3. **Caching**: Cache dependencies and build artifacts
4. **Rollback Strategy**: Always have rollback capability

### Monitoring
1. **Metrics Collection**: Collect relevant metrics
2. **Alerting**: Set up alerts for critical issues
3. **Logging**: Structured logging for debugging
4. **Health Checks**: Implement comprehensive health checks

---

**Status**: Active Development  
**Last Updated**: August 2025  
**Maintainer**: Debian Bootc Image Builder Team