apt-ostree/.notes/architecture/system_design.md
robojerk 3521e79310 🎉 MAJOR MILESTONE: Complete apt-ostree implementation with 100% rpm-ostree compatibility
 All 21 rpm-ostree commands implemented:
- High Priority (5/5): Status, Deploy, Reset, Rebase, Kargs
- Medium Priority (4/4): Install, Remove, Upgrade, Rollback
- Low Priority (7/7): List, History, DB, Initramfs, Reload, Search, Info
- Additional (5/5): Checkout, Prune, Compose, Override, RefreshMd

 Real APT Integration:
- Client-side package management
- Atomic operations with rollback
- State synchronization

 Production-Ready Architecture:
- Daemon-client with D-Bus communication
- Bubblewrap sandboxing
- Fallback mechanisms

 Advanced Features:
- OCI container image generation
- Comprehensive error handling
- Full test coverage

This represents a complete, production-ready apt-ostree implementation
that provides 100% rpm-ostree compatibility for Debian/Ubuntu systems.
2025-07-19 07:14:28 +00:00

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# System Architecture Design Guide
## Overview
This document combines research on advanced architecture, daemon design, and critical integration for apt-ostree.
## Advanced Architecture Research
### Core Principles
- **Modular design**: Separate concerns into distinct modules
- **Interface abstraction**: Clean interfaces between components
- **Error handling**: Comprehensive error management
- **Security model**: Privilege separation and authentication
### Component Architecture
- **CLI layer**: User interface and command parsing
- **Daemon layer**: Privileged operations and state management
- **Integration layer**: APT-OSTree coordination
- **Storage layer**: OSTree and package management
## Daemon Architecture
### Design Philosophy
- **Privilege separation**: Root operations isolated in daemon
- **D-Bus communication**: Standard system service interface
- **Service activation**: Systemd integration
- **State management**: Centralized system state
### Implementation
- **apt-ostreed**: Main daemon process
- **D-Bus interface**: Service communication protocol
- **Policy management**: Security and access control
- **Transaction handling**: Atomic operation management
### D-Bus Interface
- **org.aptostree.dev**: Service interface
- **Method definitions**: Package management operations
- **Signal handling**: State change notifications
- **Error reporting**: Comprehensive error information
## Critical Integration
### APT-OSTree Coordination
- **Package installation**: APT operations in OSTree context
- **State synchronization**: Keep databases in sync
- **Transaction management**: Atomic package operations
- **Rollback support**: Complete system rollback
### Bubblewrap Integration
- **Script sandboxing**: Secure package script execution
- **Namespace isolation**: Process isolation
- **Bind mounts**: Controlled filesystem access
- **Security controls**: Privilege restrictions
### Filesystem Management
- **OSTree operations**: Commit creation and management
- **Layer application**: Package layer integration
- **Deployment management**: Boot configuration
- **State tracking**: System state monitoring
## Implementation Strategy
### Phase 1: Foundation
- Basic daemon-client architecture
- D-Bus communication setup
- Security policy configuration
- Error handling framework
### Phase 2: Integration
- APT package management integration
- OSTree filesystem operations
- Transaction management
- Rollback implementation
### Phase 3: Advanced Features
- Bubblewrap sandboxing
- Advanced security features
- Performance optimization
- Comprehensive testing
## Technical Details
### D-Bus Communication
- Service registration and activation
- Method call handling
- Signal emission and reception
- Error propagation
### Security Model
- Privilege separation
- Access control policies
- Sandboxing implementation
- Audit logging
### State Management
- System state tracking
- Transaction state management
- Rollback state preservation
- Configuration management
## References
- See .notes/research/advanced-architecture.md for detailed architecture research
- See .notes/research/daemon.md for daemon architecture details
- See .notes/rpm-ostree/daemon-client-architecture.md for rpm-ostree daemon analysis
- See .notes/critical_integration_implementation.md for critical integration details