# build.func Architecture Guide

## Overview

This document provides a high-level architectural overview of `build.func`, including module dependencies, data flow, integration points, and system architecture.

## High-Level Architecture

```
┌─────────────────────────────────────────────────────────────────────────────────┐
│                           Proxmox Host System                                  │
│                                                                                 │
│  ┌─────────────────────────────────────────────────────────────────────────────┐ │
│  │                        build.func                                          │ │
│  │                                                                           │ │
│  │  ┌─────────────────┐  ┌─────────────────┐  ┌─────────────────────────────┐ │ │
│  │  │   Entry Point   │  │   Configuration │  │      Container Creation     │ │ │
│  │  │                 │  │                 │  │                             │ │ │
│  │  │ • start()       │  │ • variables()   │  │ • build_container()        │ │ │
│  │  │ • install_      │  │ • base_         │  │ • create_lxc_container()    │ │ │
│  │  │   script()      │  │   settings()    │  │ • configure_gpu_           │ │ │
│  │  │ • advanced_     │  │ • select_       │  │   passthrough()             │ │ │
│  │  │   settings()    │  │   storage()     │  │ • fix_gpu_gids()            │ │ │
│  │  └─────────────────┘  └─────────────────┘  └─────────────────────────────┘ │ │
│  └─────────────────────────────────────────────────────────────────────────────┘ │
│                                                                                 │
│  ┌─────────────────────────────────────────────────────────────────────────────┐ │
│  │                        Module Dependencies                                │ │
│  │                                                                           │ │
│  │  ┌─────────────────┐  ┌─────────────────┐  ┌─────────────────────────────┐ │ │
│  │  │   core.func     │  │ error_handler.   │  │        api.func             │ │ │
│  │  │                 │  │ func             │  │                             │ │ │
│  │  │ • Basic         │  │ • Error          │  │ • Proxmox API               │ │ │
│  │  │   utilities     │  │   handling       │  │   interactions              │ │ │
│  │  │ • Common        │  │ • Error          │  │ • Container                  │ │ │
│  │  │   functions     │  │   recovery       │  │   management                │ │ │
│  │  │ • System        │  │ • Cleanup        │  │ • Status                    │ │ │
│  │  │   utilities     │  │   functions      │  │   monitoring                 │ │ │
│  │  └─────────────────┘  └─────────────────┘  └─────────────────────────────┘ │ │
│  │                                                                           │ │
│  │  ┌─────────────────────────────────────────────────────────────────────────┐ │ │
│  │  │                        tools.func                                      │ │ │
│  │  │                                                                       │ │ │
│  │  │ • Additional utilities                                                 │ │ │
│  │  │ • Helper functions                                                     │ │ │
│  │  │ • System tools                                                         │ │ │
│  │  └─────────────────────────────────────────────────────────────────────────┘ │ │
│  └─────────────────────────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────────────────┘
```

## Module Dependencies

### Core Dependencies

```
build.func Dependencies:
├── core.func
│   ├── Basic system utilities
│   ├── Common functions
│   ├── System information
│   └── File operations
├── error_handler.func
│   ├── Error handling
│   ├── Error recovery
│   ├── Cleanup functions
│   └── Error logging
├── api.func
│   ├── Proxmox API interactions
│   ├── Container management
│   ├── Status monitoring
│   └── Configuration updates
└── tools.func
    ├── Additional utilities
    ├── Helper functions
    ├── System tools
    └── Custom functions
```

### Dependency Flow

```
Dependency Flow:
├── build.func
│   ├── Sources core.func
│   ├── Sources error_handler.func
│   ├── Sources api.func
│   └── Sources tools.func
├── core.func
│   ├── Basic utilities
│   └── System functions
├── error_handler.func
│   ├── Error management
│   └── Recovery functions
├── api.func
│   ├── Proxmox integration
│   └── Container operations
└── tools.func
    ├── Additional tools
    └── Helper functions
```

## Data Flow Architecture

### Configuration Data Flow

```
Configuration Data Flow:
├── Environment Variables
│   ├── Hard environment variables
│   ├── App-specific .vars
│   ├── Global default.vars
│   └── Built-in defaults
├── Variable Resolution
│   ├── Apply precedence chain
│   ├── Validate settings
│   └── Resolve conflicts
├── Configuration Storage
│   ├── Memory variables
│   ├── Temporary files
│   └── Persistent storage
└── Configuration Usage
    ├── Container creation
    ├── Feature configuration
    └── Settings persistence
```

### Container Data Flow

```
Container Data Flow:
├── Input Data
│   ├── Configuration variables
│   ├── Resource specifications
│   ├── Network settings
│   └── Storage requirements
├── Processing
│   ├── Validation
│   ├── Conflict resolution
│   ├── Resource allocation
│   └── Configuration generation
├── Container Creation
│   ├── LXC container creation
│   ├── Network configuration
│   ├── Storage setup
│   └── Feature configuration
└── Output
    ├── Container status
    ├── Access information
    ├── Configuration files
    └── Log files
```

## Integration Architecture

### With Proxmox System

```
Proxmox Integration:
├── Proxmox Host
│   ├── LXC container management
│   ├── Storage management
│   ├── Network management
│   └── Resource management
├── Proxmox API
│   ├── Container operations
│   ├── Configuration updates
│   ├── Status monitoring
│   └── Error handling
├── Proxmox Configuration
│   ├── /etc/pve/lxc/<ctid>.conf
│   ├── Storage configuration
│   ├── Network configuration
│   └── Resource configuration
└── Proxmox Services
    ├── Container services
    ├── Network services
    ├── Storage services
    └── Monitoring services
```

### With Install Scripts

```
Install Script Integration:
├── build.func
│   ├── Creates container
│   ├── Configures basic settings
│   ├── Starts container
│   └── Provides access
├── Install Scripts
│   ├── <app>-install.sh
│   ├── Downloads application
│   ├── Configures application
│   └── Sets up services
├── Container
│   ├── Running application
│   ├── Configured services
│   ├── Network access
│   └── Storage access
└── Integration Points
    ├── Container creation
    ├── Network configuration
    ├── Storage setup
    └── Service configuration
```

## System Architecture Components

### Core Components

```
System Components:
├── Entry Point
│   ├── start() function
│   ├── Context detection
│   ├── Environment capture
│   └── Workflow routing
├── Configuration Management
│   ├── Variable resolution
│   ├── Settings persistence
│   ├── Default management
│   └── Validation
├── Container Creation
│   ├── LXC container creation
│   ├── Network configuration
│   ├── Storage setup
│   └── Feature configuration
├── Hardware Integration
│   ├── GPU passthrough
│   ├── USB passthrough
│   ├── Storage management
│   └── Network management
└── Error Handling
    ├── Error detection
    ├── Error recovery
    ├── Cleanup functions
    └── User notification
```

### User Interface Components

```
UI Components:
├── Menu System
│   ├── Installation mode selection
│   ├── Configuration menus
│   ├── Storage selection
│   └── GPU configuration
├── Interactive Elements
│   ├── Whiptail menus
│   ├── User prompts
│   ├── Confirmation dialogs
│   └── Error messages
├── Non-Interactive Mode
│   ├── Environment variable driven
│   ├── Silent execution
│   ├── Automated configuration
│   └── Error handling
└── Output
    ├── Status messages
    ├── Progress indicators
    ├── Completion information
    └── Access details
```

## Security Architecture

### Security Considerations

```
Security Architecture:
├── Container Security
│   ├── Unprivileged containers (default)
│   ├── Privileged containers (when needed)
│   ├── Resource limits
│   └── Access controls
├── Network Security
│   ├── Network isolation
│   ├── VLAN support
│   ├── Firewall integration
│   └── Access controls
├── Storage Security
│   ├── Storage isolation
│   ├── Access controls
│   ├── Encryption support
│   └── Backup integration
├── GPU Security
│   ├── Device isolation
│   ├── Permission management
│   ├── Access controls
│   └── Security validation
└── API Security
    ├── Authentication
    ├── Authorization
    ├── Input validation
    └── Error handling
```

## Performance Architecture

### Performance Considerations

```
Performance Architecture:
├── Execution Optimization
│   ├── Parallel operations
│   ├── Efficient algorithms
│   ├── Minimal user interaction
│   └── Optimized validation
├── Resource Management
│   ├── Memory efficiency
│   ├── CPU optimization
│   ├── Disk usage optimization
│   └── Network efficiency
├── Caching
│   ├── Configuration caching
│   ├── Template caching
│   ├── Storage caching
│   └── GPU detection caching
└── Monitoring
    ├── Performance monitoring
    ├── Resource monitoring
    ├── Error monitoring
    └── Status monitoring
```

## Deployment Architecture

### Deployment Scenarios

```
Deployment Scenarios:
├── Single Container
│   ├── Individual application
│   ├── Standard configuration
│   ├── Basic networking
│   └── Standard storage
├── Multiple Containers
│   ├── Application stack
│   ├── Shared networking
│   ├── Shared storage
│   └── Coordinated deployment
├── High Availability
│   ├── Redundant containers
│   ├── Load balancing
│   ├── Failover support
│   └── Monitoring integration
└── Development Environment
    ├── Development containers
    ├── Testing containers
    ├── Staging containers
    └── Production containers
```

## Maintenance Architecture

### Maintenance Components

```
Maintenance Architecture:
├── Updates
│   ├── Container updates
│   ├── Application updates
│   ├── Configuration updates
│   └── Security updates
├── Monitoring
│   ├── Container monitoring
│   ├── Resource monitoring
│   ├── Performance monitoring
│   └── Error monitoring
├── Backup
│   ├── Configuration backup
│   ├── Container backup
│   ├── Storage backup
│   └── Recovery procedures
└── Troubleshooting
    ├── Error diagnosis
    ├── Log analysis
    ├── Performance analysis
    └── Recovery procedures
```

## Future Architecture Considerations

### Scalability

```
Scalability Considerations:
├── Horizontal Scaling
│   ├── Multiple containers
│   ├── Load balancing
│   ├── Distributed deployment
│   └── Resource distribution
├── Vertical Scaling
│   ├── Resource scaling
│   ├── Performance optimization
│   ├── Capacity planning
│   └── Resource management
├── Automation
│   ├── Automated deployment
│   ├── Automated scaling
│   ├── Automated monitoring
│   └── Automated recovery
└── Integration
    ├── External systems
    ├── Cloud integration
    ├── Container orchestration
    └── Service mesh
```
