# apt-layer C Implementation - Setup Summary

## Project Structure

```
apt-layer/
├── build/           # Build artifacts (gitignored)
├── docker/          # Docker testing environment (gitignored)
│   ├── docker-compose.yml
│   └── Dockerfile
├── scripts/         # Testing scripts and documentation
│   ├── start-testing.sh
│   ├── start-testing.ps1
│   ├── test-apt-layer.sh
│   ├── README.md
│   └── SETUP-SUMMARY.md
├── src/             # C source code
├── bin/             # Compiled binary
├── Makefile
├── .gitignore
└── README.md
```

## Key Changes Made

### 1. Directory Reorganization
- **Moved** `testing/` → `docker/` (more descriptive)
- **Created** `build/` directory for build artifacts
- **Created** `scripts/` directory for all testing scripts
- **Updated** `.gitignore` to exclude build and docker directories

### 2. apt-cache Integration
- **Removed** duplicate apt-cacher-ng service
- **Connected** to existing apt-cacher-ng from particleos-builder
- **Uses** existing `particleos-network` for connectivity
- **Configured** apt proxy settings in Dockerfile

### 3. Simplified Docker Setup
- **Single container** instead of multiple services
- **External network** dependency on particleos-network
- **External volume** for apt-cache data
- **Streamlined** startup process

## Docker Configuration

### docker-compose.yml
```yaml
name: apt-layer-testing

services:
  apt-layer-test:
    build:
      context: ..
      dockerfile: docker/Dockerfile
    container_name: apt-layer-test
    depends_on:
      - apt-cacher-ng
    volumes:
      - ..:/workspace
      - apt-layer-cache:/cache
    environment:
      - http_proxy=http://apt-cacher-ng:3142
      - https_proxy=http://apt-cacher-ng:3142
    networks:
      - particleos-network

  apt-cacher-ng:
    external: true
    name: apt-cacher-ng

networks:
  particleos-network:
    external: true
    name: particleos-network
```

### Dockerfile Features
- **Ubuntu 24.04** base image
- **apt-cache proxy** configuration
- **Build tools** (gcc, make, git)
- **OSTree** with development headers
- **Container tools** (podman, docker)
- **Interactive entrypoint** with helpful information

## Startup Scripts

### Bash Script (`start-testing.sh`)
- **Auto-detects** project and docker directories
- **Checks** apt-cache server connectivity
- **Builds** and starts container
- **Attaches** to interactive shell

### PowerShell Script (`start-testing.ps1`)
- **Windows-compatible** startup
- **Same functionality** as bash script
- **Error handling** for Windows environment

## Testing Workflow

### 1. Basic Testing (Outside Container)
```bash
./scripts/test-apt-layer.sh
```
- Builds C binary
- Tests basic functionality
- Checks dependencies
- Validates OSTree operations

### 2. Advanced Testing (Inside Container)
```bash
# Start container
./scripts/start-testing.sh

# Inside container
make clean && make
./bin/apt-layer --help
./bin/apt-layer --list
```

## Integration Benefits

### With particleos-builder
- **Shared apt-cache**: Faster package downloads
- **Shared network**: No port conflicts
- **Complementary**: Different focus areas
- **Resource efficient**: Reuses existing infrastructure

### Development Workflow
- **Fast iteration**: Quick container restarts
- **Isolated testing**: No host system impact
- **Consistent environment**: Same setup everywhere
- **Easy cleanup**: Docker volumes and containers

## Troubleshooting

### Common Issues
1. **apt-cache not found**: Start `apt-cacher-ng` container
2. **Network issues**: Check `particleos-network` exists
3. **Build failures**: Check container logs
4. **Permission issues**: Verify volume mounts

### Commands
```bash
# Check apt-cache
curl http://localhost:3142/acng-report.html

# Check network
docker network ls | grep particleos

# Check container
docker-compose -f docker/docker-compose.yml ps

# View logs
docker-compose -f docker/docker-compose.yml logs apt-layer-test
```

## Next Steps

1. **Test the setup** with basic commands
2. **Verify apt-cache** integration works
3. **Run full test suite** in container
4. **Develop features** with confidence
5. **Iterate** on C implementation

This setup provides a robust, integrated testing environment that leverages your existing infrastructure while maintaining isolation for apt-layer development.