apt-ostree/docs/apt-ostree-daemon-plan/documentation/documentation-plan.md

Documentation Plan

🎯 Objective

Create comprehensive, user-friendly documentation that covers all aspects of apt-ostree, from basic usage to advanced development, ensuring users and developers can effectively use and contribute to the system.

📚 Documentation Structure

1. User Documentation

• Quick Start Guide: Get up and running in minutes
• User Manual: Complete user reference
• Troubleshooting: Common issues and solutions
• Examples: Real-world usage scenarios

2. Developer Documentation

• Architecture Guide: System design and components
• API Reference: Complete interface documentation
• Development Guide: Contributing to apt-ostree
• Testing Guide: Testing strategies and examples

3. Administrator Documentation

• Installation Guide: System deployment
• Configuration Guide: System customization
• Security Guide: Security policies and hardening
• Maintenance Guide: System upkeep and monitoring

📖 User Documentation

Quick Start Guide

# Quick Start Guide

## Installation
```bash
# Debian/Ubuntu
sudo apt update
sudo apt install apt-ostree

# From source
git clone https://github.com/your-org/apt-ostree.git
cd apt-ostree
cargo build --release
sudo cp target/release/apt-ostree /usr/local/bin/

First Steps

# Check system status
apt-ostree status

# Search for packages
apt-ostree search nginx

# Install a package
sudo apt-ostree install nginx

# Check system health
apt-ostree metrics

Basic Operations

• System upgrade: apt-ostree upgrade
• Package management: apt-ostree install/remove
• System rollback: apt-ostree rollback
• Live updates: apt-ostree apply-live

### **User Manual**
```markdown
# User Manual

## Table of Contents
1. [Introduction](introduction.md)
2. [Getting Started](getting-started.md)
3. [Basic Commands](basic-commands.md)
4. [Package Management](package-management.md)
5. [System Operations](system-operations.md)
6. [Advanced Features](advanced-features.md)
7. [Troubleshooting](troubleshooting.md)
8. [Reference](reference.md)

## Command Reference
### Core Commands
- `status` - System status and information
- `upgrade` - System upgrade operations
- `rollback` - System rollback functionality
- `deploy` - Deployment management
- `rebase` - Tree rebasing operations

### Package Management
- `install` - Install packages
- `uninstall` - Remove packages
- `search` - Search for packages
- `override` - Package override management

### System Management
- `initramfs` - Initramfs management
- `kargs` - Kernel argument management
- `reload` - Reload configuration
- `cancel` - Cancel operations

### Advanced Commands
- `compose` - Tree composition
- `db` - Database operations
- `reset` - System reset
- `refresh-md` - Refresh metadata

### Live Updates
- `apply-live` - Apply live updates
- `usroverlay` - User overlay management

### Utility Commands
- `cleanup` - System cleanup
- `finalize-deployment` - Finalize deployment
- `metrics` - System metrics

Troubleshooting Guide

# Troubleshooting Guide

## Common Issues

### Package Installation Failures
**Problem**: Package installation fails with dependency errors
**Solution**: 
```bash
# Check package dependencies
apt-ostree search <package-name>

# Verify system state
apt-ostree status

# Try with dependency resolution
apt-ostree install <package-name> --resolve-deps

System Upgrade Issues

Problem: System upgrade fails or hangs Solution:

# Check for active transactions
apt-ostree transaction list

# Cancel stuck operations
apt-ostree cancel

# Verify system integrity
apt-ostree db verify

Permission Errors

Problem: Operation fails with permission denied Solution:

# Use sudo for privileged operations
sudo apt-ostree install <package-name>

# Check Polkit authorization
pkaction --action-id org.projectatomic.aptostree1.install

# Verify user permissions
apt-ostree security check-user

Error Codes

• E001: Permission denied
• E002: Package not found
• E003: Dependency conflict
• E004: System state error
• E005: Network error
• E006: Disk space error
• E007: Transaction error
• E008: Security violation

Recovery Procedures

1. System Rollback: apt-ostree rollback
2. Transaction Cleanup: apt-ostree cleanup
3. Database Repair: apt-ostree db repair
4. System Reset: apt-ostree reset

## 🛠️ **Developer Documentation**

### **Architecture Guide**
```markdown
# Architecture Guide

## System Overview
apt-ostree is a hybrid image/package system that combines OSTree for atomic updates with APT for package management.

## Component Architecture

┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ CLI Client │ │ System Daemon │ │ OSTree Repo │ │ (apt-ostree) │◄──►│ (apt-ostreed) │◄──►│ │ └─────────────────┘ └─────────────────┘ └─────────────────┘ │ │ │ │ │ │ ▼ ▼ ▼ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ APT Cache │ │ Transaction │ │ Package Store │ │ │ │ Manager │ │ │ └─────────────────┘ └─────────────────┘ └─────────────────┘

## Core Components

### CLI Client
- **Purpose**: User interface and command processing
- **Responsibilities**: Argument parsing, command dispatch, output formatting
- **Communication**: DBus interface with daemon

### System Daemon
- **Purpose**: Background service for system operations
- **Responsibilities**: Package management, transaction processing, system operations
- **Interfaces**: DBus API, system integration

### Transaction Manager
- **Purpose**: Atomic operation coordination
- **Responsibilities**: Transaction lifecycle, rollback support, state management
- **Features**: ACID properties, conflict resolution

### Package Manager
- **Purpose**: APT integration and package operations
- **Responsibilities**: Dependency resolution, package installation, cache management
- **Features**: Parallel operations, intelligent caching

API Reference

# API Reference

## DBus Interface

### org.projectatomic.aptostree1

#### Methods

##### get_system_status()
Returns the current system status and deployment information.

**Parameters**: None
**Returns**: `String` - JSON-formatted system status
**Errors**: 
- `org.freedesktop.DBus.Error.AccessDenied`: Insufficient permissions
- `org.freedesktop.DBus.Error.Failed`: Operation failed

**Example**:
```bash
dbus-send --system --dest=org.projectatomic.aptostree1 \
    --print-reply /org/projectatomic/aptostree1 \
    org.projectatomic.aptostree1.get_system_status

install_packages(packages: Array)

Installs the specified packages.

Parameters:

• packages: Array of package names to install

Returns: String - Transaction ID Errors:

• org.freedesktop.DBus.Error.AccessDenied: Insufficient permissions
• org.freedesktop.DBus.Error.InvalidArgs: Invalid package names
• org.freedesktop.DBus.Error.Failed: Installation failed

Example:

dbus-send --system --dest=org.projectatomic.aptostree1 \
    --print-reply /org/projectatomic/aptostree1 \
    org.projectatomic.aptostree1.install_packages \
    array:string:"nginx","vim"

Properties

SystemStatus (read)

Current system status information.

Type: String Access: Read Description: JSON-formatted system status

PackageCount (read)

Total number of installed packages.

Type: UInt32 Access: Read Description: Count of installed packages

Signals

package_installed(package: String, version: String)

Emitted when a package is successfully installed.

Parameters:

• package: Name of the installed package
• version: Version of the installed package

transaction_completed(transaction_id: String, success: Boolean)

Emitted when a transaction completes.

Parameters:

• transaction_id: ID of the completed transaction
• success: Whether the transaction succeeded

### **Development Guide**
```markdown
# Development Guide

## Setting Up Development Environment

### Prerequisites
- Rust 1.70+
- Cargo
- Git
- Build tools (gcc, make, pkg-config)

### Development Setup
```bash
# Clone repository
git clone https://github.com/your-org/apt-ostree.git
cd apt-ostree

# Install dependencies
sudo apt update
sudo apt install build-essential pkg-config libostree-dev libapt-pkg-dev

# Build project
cargo build

# Run tests
cargo test

# Run linter
cargo clippy

# Format code
cargo fmt

Project Structure

src/
├── main.rs              # CLI entry point
├── lib.rs               # Library exports
├── daemon/              # Daemon implementation
│   ├── mod.rs           # Daemon module
│   ├── main.rs          # Daemon entry point
│   ├── dbus.rs          # DBus interface
│   ├── transaction.rs   # Transaction management
│   ├── ostree.rs        # OSTree operations
│   ├── apt.rs           # APT integration
│   ├── security.rs      # Security management
│   ├── sysroot.rs       # Sysroot operations
│   └── os.rs            # OS interface
├── client/               # Client implementation
│   ├── mod.rs           # Client module
│   ├── dbus.rs          # DBus client
│   └── transaction.rs   # Transaction client
└── lib/                  # Core library
    ├── error.rs          # Error handling
    ├── logging.rs        # Logging system
    ├── security.rs       # Security utilities
    └── system.rs         # System utilities

Coding Standards

Rust Conventions

• Follow Rust naming conventions
• Use meaningful variable and function names
• Implement proper error handling with Result<T, E>
• Use async/await for asynchronous operations
• Implement comprehensive testing

Code Organization

• Keep functions small and focused
• Use modules for logical grouping
• Implement proper error propagation
• Add comprehensive documentation comments

Testing Requirements

• Unit tests for all public functions
• Integration tests for workflows
• Performance benchmarks for critical paths
• Security tests for validation functions

Contributing

Development Workflow

1. Fork the repository
2. Create a feature branch
3. Implement your changes
4. Add tests for new functionality
5. Update documentation
6. Submit a pull request

Code Review Process

• All changes require code review
• Tests must pass before merge
• Documentation must be updated
• Security implications must be reviewed

Release Process

1. Update version numbers
2. Update changelog
3. Run full test suite
4. Create release tag
5. Build and package
6. Deploy to repositories

## 🔧 **Administrator Documentation**

### **Installation Guide**
```markdown
# Installation Guide

## System Requirements

### Supported Distributions
- Debian 13+ (Trixie)
- Ubuntu 25.04+ (Noble Numbat)

### Hardware Requirements
- **CPU**: x86_64 or ARM64
- **Memory**: 2GB RAM minimum, 4GB recommended
- **Storage**: 10GB free space minimum
- **Network**: Internet connection for package downloads

### Dependencies
- OSTree 2023.1+
- APT 2.6+
- Systemd 250+
- Polkit 0.120+

## Installation Methods

### Package Installation (Recommended)
```bash
# Add repository
echo "deb https://apt.example.com/apt-ostree stable main" | \
    sudo tee /etc/apt/sources.list.d/apt-ostree.list

# Add GPG key
wget -qO - https://apt.example.com/apt-ostree.gpg.key | \
    sudo apt-key add -

# Update package list
sudo apt update

# Install apt-ostree
sudo apt install apt-ostree apt-ostreed

Source Installation

# Install build dependencies
sudo apt install build-essential pkg-config \
    libostree-dev libapt-pkg-dev libpolkit-gobject-1-dev

# Clone and build
git clone https://github.com/your-org/apt-ostree.git
cd apt-ostree
cargo build --release

# Install binaries
sudo cp target/release/apt-ostree /usr/local/bin/
sudo cp target/release/apt-ostreed /usr/local/bin/

# Install systemd services
sudo cp daemon/systemd/*.service /etc/systemd/system/
sudo cp daemon/systemd/*.socket /etc/systemd/system/

# Install Polkit policy
sudo cp daemon/polkit/*.policy /usr/share/polkit-1/actions/

# Enable and start services
sudo systemctl daemon-reload
sudo systemctl enable apt-ostreed.socket
sudo systemctl start apt-ostreed.socket

Post-Installation

Verify Installation

# Check binary installation
apt-ostree --version
apt-ostreed --version

# Check service status
sudo systemctl status apt-ostreed.socket

# Test basic functionality
apt-ostree status

Initial Configuration

# Create configuration directory
sudo mkdir -p /etc/apt-ostree

# Create configuration file
sudo tee /etc/apt-ostree/config.toml > /dev/null <<EOF
[system]
ostree_repo = "/var/lib/apt-ostree"
cache_dir = "/var/cache/apt-ostree"
log_level = "info"

[security]
require_authentication = true
allowed_users = ["root", "sudo"]
policy_file = "/etc/apt-ostree/policy.conf"

[logging]
file_path = "/var/log/apt-ostree.log"
max_file_size = "100MB"
max_files = 7
format = "json"
EOF

# Set permissions
sudo chown root:root /etc/apt-ostree/config.toml
sudo chmod 644 /etc/apt-ostree/config.toml

Troubleshooting

Common Issues

• Service won't start: Check dependencies and permissions
• Permission denied: Verify Polkit configuration
• Network errors: Check firewall and proxy settings
• Storage errors: Verify disk space and permissions

## 📊 **Documentation Metrics**

### **Completeness Goals**
- **User Documentation**: 100% command coverage
- **Developer Documentation**: 100% API coverage
- **Administrator Documentation**: 100% deployment coverage
- **Examples**: 50+ practical examples

### **Quality Goals**
- **Readability**: Clear, concise language
- **Accuracy**: 100% technical accuracy
- **Completeness**: No missing information
- **Maintainability**: Easy to update and extend

## 🔧 **Implementation Plan**

### **Phase 1: Foundation (Week 5)**
- [ ] Create documentation structure
- [ ] Write user quick start guide
- [ ] Document basic commands
- [ ] Create troubleshooting guide

### **Phase 2: Core Documentation (Week 5)**
- [ ] Complete user manual
- [ ] Write architecture guide
- [ ] Document API reference
- [ ] Create development guide

### **Phase 3: Advanced Documentation (Week 6)**
- [ ] Write administrator guides
- [ ] Create configuration examples
- [ ] Document security policies
- [ ] Add performance tuning guides

### **Phase 4: Validation (Week 6)**
- [ ] User documentation review
- [ ] Technical accuracy validation
- [ ] Usability testing
- [ ] Final documentation review

## 🔗 **Related Documentation**

- [Architecture Overview](../architecture/overview.md)
- [CLI Commands](../architecture/cli-command-structure.md)
- [Package Management](../architecture/apt-library-analysis.md)
- [Security Model](../security/security-hardening.md)
- [Performance Optimization](../optimization/performance-optimization.md)