Major milestone: Complete apt-ostree bootc compatibility and OCI integration
- ✅ Real package installation (replaced mock installation) - ✅ Real OSTree commit creation from installed packages - ✅ OCI image creation from both commits and rootfs - ✅ Full bootc compatibility with proper labels - ✅ Comprehensive test suite (test-bootc-apt-ostree.sh) - ✅ Container tool validation (skopeo, podman) - ✅ Updated compatibility reports for Ubuntu Questing - ✅ Fixed OCI schema version and field naming issues - ✅ Temporary directory lifecycle fixes - ✅ Serde rename attributes for OCI JSON compliance Ready for Aurora-style workflow deployment!
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.notes/client-daemon/apt-ostree.md
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# apt-ostree Client-Daemon Architecture
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## Executive Summary
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apt-ostree implements the same sophisticated client-daemon architecture as rpm-ostree, providing security, reliability, and concurrent operation support while maintaining 100% compatibility with the rpm-ostree interface. The architecture separates privileged system operations from unprivileged user interactions.
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## Architecture Overview
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### High-Level Architecture
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```
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┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐
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│ CLI Client │ │ GUI Client │ │ API Client │
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│ (apt-ostree) │ │ (GNOME/KDE) │ │ (Python/Go) │
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└─────────┬───────┘ └─────────┬───────┘ └─────────┬───────┘
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│ │ │
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└──────────────────────┼──────────────────────┘
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│
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┌─────────────▼─────────────┐
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│ D-Bus Interface │
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│ (org.aptostree.dev) │
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└─────────────┬─────────────┘
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│
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┌─────────────▼─────────────┐
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│ apt-ostreed Daemon │
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│ (Privileged Service) │
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└─────────────┬─────────────┘
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│
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┌───────────────────────┼───────────────────────┐
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│ │ │
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┌─────▼─────┐ ┌───────▼──────┐ ┌─────▼─────┐
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│ libapt-pkg│ │ libostree │ │ System │
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│ (APT/DEB) │ │ (Filesystem) │ │ Services │
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└───────────┘ └──────────────┘ └───────────┘
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```
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### Design Principles
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1. **Privilege Separation**: Daemon runs with elevated privileges, clients run unprivileged
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2. **D-Bus Communication**: Standard system service interface for inter-process communication
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3. **Transaction Management**: Atomic operations with rollback capability
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4. **Concurrent Operations**: Multiple clients can interact simultaneously
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5. **State Persistence**: Daemon maintains system state across operations
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6. **100% Compatibility**: Identical interface to rpm-ostree
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## Client Architecture
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### CLI Client (`apt-ostree`)
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**Purpose**: Command-line interface for user interaction
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**Key Components**:
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- **Command Parser**: Parse command-line arguments
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- **D-Bus Client**: Communicate with daemon
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- **Progress Handler**: Display operation progress
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- **Error Handler**: Handle and display errors
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- **Fallback Handler**: Direct system calls if daemon fails
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**Implementation**:
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```rust
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pub struct AptOstreeClient {
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// D-Bus client
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connection: Option<Connection>,
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// Command dispatch
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pub fn execute_command(&mut self, args: &[String]) -> Result<(), Error>;
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// D-Bus communication
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pub fn connect_to_daemon(&mut self) -> Result<(), Error>;
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pub fn call_daemon_method(&mut self, method: &str, params: &[&str]) -> Result<(), Error>;
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// Fallback handling
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pub fn fallback_to_direct_calls(&mut self, args: &[String]) -> Result<(), Error>;
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// Progress handling
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pub fn handle_progress(&self, message: &str, percentage: i32);
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pub fn handle_completion(&self, success: bool, result: &str);
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}
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```
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**Command Flow**:
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1. Parse command-line arguments
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2. Try to connect to daemon via D-Bus
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3. If daemon available: Send operation request
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4. If daemon unavailable: Use direct system calls
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5. Handle progress updates
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6. Display results or errors
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### GUI Clients (Planned)
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**Purpose**: Graphical user interfaces for system management
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**Components**:
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- **GNOME Software**: Integration with GNOME Software Center
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- **KDE Discover**: Integration with KDE Discover
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- **Custom GUIs**: Third-party graphical interfaces
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**Implementation**:
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- Use D-Bus interface for system operations
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- Provide user-friendly progress indicators
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- Handle authentication via PolicyKit
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- Display system status and deployment information
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### API Clients (Planned)
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**Purpose**: Programmatic interfaces for automation and integration
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**Components**:
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- **Python Bindings**: Python library for apt-ostree operations
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- **Go Bindings**: Go library for apt-ostree operations
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- **REST APIs**: HTTP-based interfaces
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**Implementation**:
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- Direct D-Bus communication
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- High-level abstractions for common operations
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- Error handling and recovery mechanisms
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- Async operation support
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## Daemon Architecture
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### Core Daemon (`apt-ostreed`)
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**Purpose**: Centralized system service for privileged operations
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**Key Components**:
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- **D-Bus Service**: Expose system management interface
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- **Transaction Manager**: Handle atomic operations
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- **State Manager**: Maintain system state
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- **Resource Manager**: Manage system resources
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- **OSTree Detection**: Environment validation
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**Implementation**:
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```rust
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pub struct AptOstreeDaemon {
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// System integration
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package_manager: PackageManager,
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// Transaction management
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transactions: HashMap<String, Transaction>,
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// D-Bus interface
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connection: Option<Connection>,
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object_manager: Option<ObjectManager>,
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// OSTree detection
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ostree_detection: OstreeDetection,
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// Service management
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pub fn start_service(&mut self) -> Result<(), Error>;
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pub fn stop_service(&mut self) -> Result<(), Error>;
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pub fn handle_client_connection(&mut self, connection: Connection) -> Result<(), Error>;
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}
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```
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**Service Lifecycle**:
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1. Initialize system components
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2. Validate OSTree environment
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3. Register D-Bus service
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4. Start listening for client connections
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5. Handle client requests
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6. Clean up on shutdown
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### D-Bus Interface
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**Service Name**: `org.aptostree.dev`
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**Main Objects**:
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- `/org/aptostree/dev/Sysroot`: System root management
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- `/org/aptostree/dev/OS`: Operating system operations
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**Key Methods**:
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```xml
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<interface name="org.aptostree.dev.OS">
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<method name="install_packages">
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<arg name="packages" type="as" direction="in"/>
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<arg name="options" type="a{sv}" direction="in"/>
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<arg name="transaction_address" type="s" direction="out"/>
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</method>
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<method name="remove_packages">
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<arg name="packages" type="as" direction="in"/>
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<arg name="options" type="a{sv}" direction="in"/>
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<arg name="transaction_address" type="s" direction="out"/>
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</method>
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<method name="upgrade_system">
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<arg name="options" type="a{sv}" direction="in"/>
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<arg name="transaction_address" type="s" direction="out"/>
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</method>
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<method name="rollback">
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<arg name="options" type="a{sv}" direction="in"/>
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<arg name="transaction_address" type="s" direction="out"/>
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</method>
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<method name="show_status">
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<arg name="options" type="a{sv}" direction="in"/>
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<arg name="status" type="s" direction="out"/>
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</method>
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<method name="list_packages">
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<arg name="options" type="a{sv}" direction="in"/>
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<arg name="packages" type="as" direction="out"/>
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</method>
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<method name="search_packages">
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<arg name="query" type="s" direction="in"/>
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<arg name="options" type="a{sv}" direction="in"/>
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<arg name="results" type="as" direction="out"/>
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</method>
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<method name="show_package_info">
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<arg name="package" type="s" direction="in"/>
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<arg name="info" type="s" direction="out"/>
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</method>
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</interface>
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```
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**Signals**:
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```xml
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<signal name="TransactionChanged">
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<arg name="transaction_address" type="s"/>
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<arg name="state" type="s"/>
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<arg name="message" type="s"/>
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<arg name="percentage" type="i"/>
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</signal>
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<signal name="TransactionCompleted">
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<arg name="transaction_address" type="s"/>
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<arg name="success" type="b"/>
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<arg name="result" type="s"/>
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</signal>
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```
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### Transaction Management
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**Purpose**: Handle atomic operations with rollback capability
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**Transaction Types**:
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1. **InstallTransaction**: Package installation with atomic commits
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2. **RemoveTransaction**: Package removal with rollback support
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3. **UpgradeTransaction**: System upgrades with automatic policies
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4. **RollbackTransaction**: Deployment rollback
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**Implementation**:
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```rust
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pub struct Transaction {
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// Transaction state
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state: TransactionState,
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transaction_id: String,
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transaction_type: TransactionType,
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// Rollback information
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rollback_points: Vec<RollbackPoint>,
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// Progress reporting
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pub fn emit_progress(&self, message: &str, percentage: i32);
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pub fn emit_completion(&self, success: bool, result: &str);
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// Atomic execution
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pub fn execute_atomic(&mut self) -> Result<(), Error>;
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pub fn rollback_on_failure(&mut self) -> Result<(), Error>;
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// State management
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pub fn set_state(&mut self, new_state: TransactionState);
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pub fn get_state(&self) -> TransactionState;
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}
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```
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**Transaction Lifecycle**:
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1. **Initiation**: Client requests operation
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2. **Validation**: Validate request parameters and OSTree environment
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3. **Preparation**: Set up rollback points
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4. **Execution**: Perform operation with progress reporting
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5. **Completion**: Finalize operation or rollback
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6. **Cleanup**: Clean up resources
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### State Management
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**Purpose**: Maintain system state across operations
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**State Components**:
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- **Deployment State**: Current and available deployments
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- **Package State**: Installed and layered packages
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- **Configuration State**: System configuration
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- **Transaction State**: Active and completed transactions
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**Implementation**:
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```rust
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pub struct StateManager {
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// System state
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deployment_state: DeploymentState,
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package_state: PackageState,
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config_state: ConfigurationState,
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// State persistence
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pub fn save_state(&self) -> Result<(), Error>;
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pub fn load_state(&mut self) -> Result<(), Error>;
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pub fn sync_state(&mut self) -> Result<(), Error>;
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// State queries
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pub fn get_current_deployment(&self) -> Result<DeploymentInfo, Error>;
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pub fn get_available_deployments(&self) -> Result<Vec<DeploymentInfo>, Error>;
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pub fn get_installed_packages(&self) -> Result<Vec<PackageInfo>, Error>;
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}
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```
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## Communication Protocol
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### D-Bus Communication
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**Connection Setup**:
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```rust
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// Client connection
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let connection = Connection::new_system_sync()?;
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// Service registration
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let object_manager = ObjectManager::new("/org/aptostree/dev");
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```
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**Method Calls**:
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```rust
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// Client method call
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let result = connection.call_method(
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Some("org.aptostree.dev"),
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"/org/aptostree/dev/OS",
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Some("org.aptostree.dev.OS"),
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"install_packages",
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&(packages, options),
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)?;
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```
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**Signal Handling**:
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```rust
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// Client signal connection
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connection.add_match(
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"type='signal',interface='org.aptostree.dev.OS',member='TransactionChanged'",
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)?;
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// Signal handler
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connection.add_signal_handler(
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"org.aptostree.dev.OS",
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"TransactionChanged",
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move |msg: &Message| {
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// Handle transaction change
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Ok(())
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},
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)?;
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```
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### Error Handling
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**Error Types**:
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1. **Network Errors**: Package download failures
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2. **Dependency Errors**: Package dependency conflicts
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3. **Filesystem Errors**: OSTree operation failures
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4. **Permission Errors**: Insufficient privileges
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5. **Transaction Errors**: Transaction failures
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6. **OSTree Environment Errors**: Non-OSTree system
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**Error Propagation**:
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```rust
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// Daemon error handling
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fn handle_error(error: &str, invocation: &MethodInvocation) -> Result<(), Error> {
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invocation.return_error(
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"org.aptostree.dev.Error",
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error,
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)
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}
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// Client error handling
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fn handle_daemon_error(error: &Error) {
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eprintln!("Error: {}", error);
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// Provide user guidance based on error type
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match error.kind() {
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ErrorKind::DaemonUnavailable => {
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eprintln!("Daemon is not running. Using direct system calls.");
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}
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ErrorKind::OstreeEnvironment => {
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eprintln!("This system is not running on an OSTree deployment.");
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}
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_ => {}
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}
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}
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```
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## Security Model
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### Privilege Separation
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**Principle**: Separate privileged operations from unprivileged user operations
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**Implementation**:
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- **Daemon**: Runs with elevated privileges (root)
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- **Client**: Runs with user privileges
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- **D-Bus**: Secure communication channel
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- **PolicyKit**: Authentication for privileged operations
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### Authentication
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**PolicyKit Integration**:
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```xml
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<policyconfig>
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<action id="org.aptostree.dev.upgrade">
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<description>Upgrade system</description>
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<message>Authentication is required to upgrade the system</message>
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<defaults>
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<allow_any>auth_admin</allow_any>
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<allow_inactive>auth_admin</allow_inactive>
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<allow_active>auth_admin</allow_active>
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</defaults>
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<annotate key="org.freedesktop.policykit.exec.path">/usr/libexec/apt-ostreed</annotate>
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</action>
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</policyconfig>
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```
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### Bubblewrap Sandboxing
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**Package Script Execution**:
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- Execute package scripts in controlled environment
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- Use namespace isolation for security
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- Restrict filesystem access
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- Limit privilege escalation
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**Implementation**:
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```rust
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pub struct BubblewrapSandbox {
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// Sandbox configuration
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namespaces: Vec<Namespace>,
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bind_mounts: Vec<BindMount>,
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security_options: Vec<SecurityOption>,
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// Script execution
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pub fn execute_script(&self, script: &str, context: &ScriptContext) -> Result<(), Error>;
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// Security controls
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pub fn set_namespace_isolation(&mut self, enabled: bool);
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pub fn add_bind_mount(&mut self, source: &str, target: &str, read_only: bool);
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pub fn set_privilege_restrictions(&mut self, restrictions: Vec<PrivilegeRestriction>);
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}
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```
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## OSTree Environment Detection
|
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|
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### Detection Methods
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|
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apt-ostree automatically detects if it's running in an OSTree environment using multiple methods:
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|
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1. **Filesystem Detection**: Check for `/ostree` directory
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2. **Boot Detection**: Check for `/run/ostree-booted` file
|
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3. **Kernel Parameter Detection**: Check for `ostree` in `/proc/cmdline`
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4. **Library Detection**: Try to load OSTree sysroot
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5. **Service Detection**: Check for daemon availability
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**Implementation**:
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```rust
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pub struct OstreeDetection {
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// Detection methods
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pub fn detect_filesystem(&self) -> bool;
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pub fn detect_boot(&self) -> bool;
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pub fn detect_kernel_params(&self) -> bool;
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pub fn detect_library(&self) -> bool;
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pub fn detect_service(&self) -> bool;
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||||
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||||
// Comprehensive detection
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||||
pub fn detect_ostree_environment(&self) -> Result<bool, Error>;
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||||
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// Error reporting
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||||
pub fn get_detection_error(&self) -> String;
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}
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```
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|
||||
### Error Handling
|
||||
|
||||
When not running in an OSTree environment, apt-ostree provides clear error messages:
|
||||
|
||||
```
|
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Error: apt-ostree requires an OSTree environment to operate.
|
||||
|
||||
This system does not appear to be running on an OSTree deployment.
|
||||
|
||||
To use apt-ostree:
|
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1. Ensure you are running on an OSTree-based system
|
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2. Verify that /ostree directory exists
|
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3. Verify that /run/ostree-booted file exists
|
||||
4. Ensure you have a valid booted deployment
|
||||
```
|
||||
|
||||
## Concurrent Operations
|
||||
|
||||
### Multiple Clients
|
||||
|
||||
**Support**: Multiple clients can interact with daemon simultaneously
|
||||
|
||||
**Implementation**:
|
||||
- **Thread-Safe Operations**: All operations are thread-safe
|
||||
- **Transaction Isolation**: Each operation gets its own transaction
|
||||
- **Resource Locking**: Prevent conflicting operations
|
||||
- **Queue Management**: Queue operations when necessary
|
||||
|
||||
### Operation Queuing
|
||||
|
||||
**Queue Management**:
|
||||
```rust
|
||||
pub struct OperationQueue {
|
||||
pending_operations: VecDeque<Operation>,
|
||||
queue_mutex: Mutex<()>,
|
||||
queue_cv: Condvar,
|
||||
|
||||
pub fn enqueue_operation(&mut self, operation: Operation);
|
||||
pub fn dequeue_operation(&mut self) -> Option<Operation>;
|
||||
pub fn has_pending_operations(&self) -> bool;
|
||||
}
|
||||
```
|
||||
|
||||
## Performance Optimization
|
||||
|
||||
### Resource Management
|
||||
|
||||
**Memory Management**:
|
||||
- Efficient memory usage for large operations
|
||||
- Garbage collection for completed transactions
|
||||
- Memory pooling for frequently allocated objects
|
||||
|
||||
**Disk Management**:
|
||||
- OSTree deduplication for storage efficiency
|
||||
- Temporary file cleanup
|
||||
- Cache management for package downloads
|
||||
|
||||
**Network Optimization**:
|
||||
- Parallel package downloads via APT
|
||||
- Connection pooling
|
||||
- Bandwidth optimization
|
||||
|
||||
### Caching
|
||||
|
||||
**Package Cache**:
|
||||
- Cache downloaded packages via APT
|
||||
- Cache package metadata
|
||||
- Cache dependency resolution results
|
||||
|
||||
**State Cache**:
|
||||
- Cache deployment information
|
||||
- Cache package lists
|
||||
- Cache configuration data
|
||||
|
||||
## Monitoring and Logging
|
||||
|
||||
### Logging
|
||||
|
||||
**Log Levels**:
|
||||
- **DEBUG**: Detailed debugging information
|
||||
- **INFO**: General information
|
||||
- **WARNING**: Warning messages
|
||||
- **ERROR**: Error messages
|
||||
- **CRITICAL**: Critical errors
|
||||
|
||||
**Log Implementation**:
|
||||
```rust
|
||||
pub struct Logger {
|
||||
pub fn debug(&self, message: &str);
|
||||
pub fn info(&self, message: &str);
|
||||
pub fn warning(&self, message: &str);
|
||||
pub fn error(&self, message: &str);
|
||||
pub fn critical(&self, message: &str);
|
||||
}
|
||||
```
|
||||
|
||||
### Monitoring
|
||||
|
||||
**Health Monitoring**:
|
||||
- Daemon health checks
|
||||
- Transaction monitoring
|
||||
- Resource usage monitoring
|
||||
- Error rate monitoring
|
||||
|
||||
**Metrics Collection**:
|
||||
- Operation success rates
|
||||
- Performance metrics
|
||||
- Resource usage statistics
|
||||
- Error statistics
|
||||
|
||||
## Systemd Integration
|
||||
|
||||
### Service Definition
|
||||
|
||||
**Service File**: `/usr/lib/systemd/system/apt-ostreed.service`
|
||||
|
||||
```ini
|
||||
[Unit]
|
||||
Description=apt-ostree Daemon
|
||||
Documentation=man:apt-ostreed(8)
|
||||
After=network.target
|
||||
|
||||
[Service]
|
||||
Type=dbus
|
||||
BusName=org.aptostree.dev
|
||||
ExecStart=/usr/libexec/apt-ostreed
|
||||
Restart=on-failure
|
||||
RestartSec=1
|
||||
User=root
|
||||
Group=root
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target
|
||||
Also=apt-ostreed.socket
|
||||
```
|
||||
|
||||
### D-Bus Activation
|
||||
|
||||
**Socket File**: `/usr/lib/systemd/system/apt-ostreed.socket`
|
||||
|
||||
```ini
|
||||
[Unit]
|
||||
Description=apt-ostree D-Bus Socket
|
||||
Documentation=man:apt-ostreed(8)
|
||||
|
||||
[Socket]
|
||||
ListenStream=/run/dbus/system_bus_socket
|
||||
SocketUser=root
|
||||
SocketGroup=root
|
||||
|
||||
[Install]
|
||||
WantedBy=sockets.target
|
||||
```
|
||||
|
||||
## Error Recovery
|
||||
|
||||
### Automatic Recovery
|
||||
|
||||
**Transaction Rollback**:
|
||||
- Automatic rollback on transaction failure
|
||||
- State restoration to previous known good state
|
||||
- Resource cleanup after rollback
|
||||
|
||||
**Daemon Recovery**:
|
||||
- Automatic daemon restart on failure
|
||||
- State recovery on daemon restart
|
||||
- Transaction recovery for incomplete operations
|
||||
|
||||
### Manual Recovery
|
||||
|
||||
**Recovery Procedures**:
|
||||
- Manual rollback procedures
|
||||
- State reset procedures
|
||||
- Configuration recovery procedures
|
||||
- Filesystem recovery procedures
|
||||
|
||||
## APT Integration
|
||||
|
||||
### APT Database Management
|
||||
|
||||
**Purpose**: Manage APT database in OSTree context
|
||||
|
||||
**Implementation**:
|
||||
```rust
|
||||
pub struct AptDatabaseManager {
|
||||
// APT integration
|
||||
cache: Option<*mut apt_pkg_Cache>,
|
||||
depcache: Option<*mut apt_pkg_DepCache>,
|
||||
|
||||
// Database operations
|
||||
pub fn initialize_database(&mut self) -> Result<(), Error>;
|
||||
pub fn update_database(&mut self) -> Result<(), Error>;
|
||||
pub fn sync_database(&mut self) -> Result<(), Error>;
|
||||
|
||||
// Package tracking
|
||||
pub fn track_package(&mut self, package: &str) -> Result<(), Error>;
|
||||
pub fn untrack_package(&mut self, package: &str) -> Result<(), Error>;
|
||||
pub fn get_tracked_packages(&self) -> Result<Vec<String>, Error>;
|
||||
}
|
||||
```
|
||||
|
||||
### Package Management
|
||||
|
||||
**Purpose**: Handle APT package operations in OSTree context
|
||||
|
||||
**Implementation**:
|
||||
```rust
|
||||
pub struct AptPackageManager {
|
||||
// APT integration
|
||||
database_manager: AptDatabaseManager,
|
||||
|
||||
// Package operations
|
||||
pub fn install_packages(&mut self, packages: &[String]) -> Result<(), Error>;
|
||||
pub fn remove_packages(&mut self, packages: &[String]) -> Result<(), Error>;
|
||||
pub fn upgrade_system(&mut self) -> Result<(), Error>;
|
||||
|
||||
// Package information
|
||||
pub fn list_packages(&self) -> Result<Vec<PackageInfo>, Error>;
|
||||
pub fn search_packages(&self, query: &str) -> Result<Vec<PackageInfo>, Error>;
|
||||
pub fn show_package_info(&self, package: &str) -> Result<PackageInfo, Error>;
|
||||
}
|
||||
```
|
||||
|
||||
## Future Enhancements
|
||||
|
||||
### Planned Features
|
||||
|
||||
1. **Container Integration**: Direct container support
|
||||
2. **Cloud Integration**: Cloud deployment support
|
||||
3. **Advanced Monitoring**: Enhanced monitoring capabilities
|
||||
4. **Performance Optimization**: Further performance improvements
|
||||
|
||||
### Architecture Improvements
|
||||
|
||||
1. **Microservices**: Split daemon into microservices
|
||||
2. **API Gateway**: REST API gateway for external access
|
||||
3. **Event Streaming**: Event streaming for real-time updates
|
||||
4. **Distributed Operations**: Support for distributed operations
|
||||
|
||||
### APT Enhancements
|
||||
|
||||
1. **Advanced Dependency Resolution**: Enhanced dependency handling
|
||||
2. **Package Conflict Resolution**: Improved conflict resolution
|
||||
3. **Repository Management**: Enhanced repository management
|
||||
4. **Package Verification**: Enhanced package verification
|
||||
|
||||
## Daemon Setup and Testing
|
||||
|
||||
### Installation and Setup
|
||||
```bash
|
||||
# Install daemon binary
|
||||
sudo cp target/release/apt-ostreed /usr/libexec/
|
||||
|
||||
# Install D-Bus configuration
|
||||
sudo cp src/daemon/org.aptostree.dev.conf /etc/dbus-1/system.d/
|
||||
|
||||
# Install systemd service
|
||||
sudo cp src/daemon/apt-ostreed.service /etc/systemd/system/
|
||||
|
||||
# Enable and start service
|
||||
sudo systemctl daemon-reload
|
||||
sudo systemctl enable apt-ostreed
|
||||
sudo systemctl start apt-ostreed
|
||||
```
|
||||
|
||||
### D-Bus Testing Commands
|
||||
```bash
|
||||
# Check daemon status
|
||||
systemctl status apt-ostreed.service
|
||||
|
||||
# List D-Bus services
|
||||
gdbus list --system | grep aptostree
|
||||
|
||||
# Test D-Bus introspection
|
||||
gdbus introspect --system --dest org.aptostree.dev --object-path /org/aptostree/dev
|
||||
|
||||
# Test Ping method
|
||||
gdbus call --system --dest org.aptostree.dev --object-path /org/aptostree/dev --method org.aptostree.dev.Daemon.Ping
|
||||
|
||||
# Test client-daemon communication
|
||||
apt-ostree daemon-ping
|
||||
apt-ostree daemon-status
|
||||
```
|
||||
|
||||
### Troubleshooting
|
||||
```bash
|
||||
# Check daemon logs
|
||||
journalctl -u apt-ostreed.service --no-pager -n 20
|
||||
|
||||
# Restart daemon
|
||||
sudo systemctl restart apt-ostreed.service
|
||||
|
||||
# Test with authentication
|
||||
pkexec gdbus call --system --dest org.aptostree.dev --object-path /org/aptostree/dev --method org.aptostree.dev.Daemon.Ping
|
||||
```
|
||||
|
||||
### Directory Structure
|
||||
```
|
||||
/usr/
|
||||
├── bin/apt-ostree # Client binary
|
||||
├── libexec/apt-ostreed # Daemon binary
|
||||
└── share/
|
||||
├── dbus-1/system-services/
|
||||
│ └── org.aptostree.dev.service # D-Bus activation
|
||||
└── polkit-1/actions/
|
||||
└── org.aptostree.dev.policy # Authorization policies
|
||||
|
||||
/etc/
|
||||
├── apt-ostree/apt-ostreed.conf # Daemon configuration
|
||||
├── dbus-1/system.d/
|
||||
│ └── org.aptostree.dev.conf # D-Bus policy
|
||||
└── systemd/system/
|
||||
├── apt-ostreed.service # Main daemon service
|
||||
├── apt-ostree-bootstatus.service # Boot status service
|
||||
├── apt-ostree-countme.service # Usage reporting service
|
||||
├── apt-ostree-countme.timer # Weekly timer
|
||||
├── apt-ostreed-automatic.service # Automatic updates
|
||||
└── apt-ostreed-automatic.timer # Daily timer
|
||||
|
||||
/var/
|
||||
├── lib/apt-ostree/ # OSTree repository and state
|
||||
├── cache/apt-ostree/ # APT cache
|
||||
└── log/apt-ostree/ # Log files
|
||||
```
|
||||
591
.notes/client-daemon/rpm-ostree.md
Normal file
591
.notes/client-daemon/rpm-ostree.md
Normal file
|
|
@ -0,0 +1,591 @@
|
|||
# rpm-ostree Client-Daemon Architecture
|
||||
|
||||
## Executive Summary
|
||||
|
||||
rpm-ostree uses a sophisticated client-daemon architecture that separates privileged system operations from unprivileged user interactions. This design provides security, reliability, and concurrent operation support while maintaining a clean user interface.
|
||||
|
||||
## Architecture Overview
|
||||
|
||||
### High-Level Architecture
|
||||
|
||||
```
|
||||
┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐
|
||||
│ CLI Client │ │ GUI Client │ │ API Client │
|
||||
│ (rpmostree) │ │ (GNOME/KDE) │ │ (Python/Go) │
|
||||
└─────────┬───────┘ └─────────┬───────┘ └─────────┬───────┘
|
||||
│ │ │
|
||||
└──────────────────────┼──────────────────────┘
|
||||
│
|
||||
┌─────────────▼─────────────┐
|
||||
│ D-Bus Interface │
|
||||
│ (org.projectatomic.rpmo │
|
||||
│ stree1) │
|
||||
└─────────────┬─────────────┘
|
||||
│
|
||||
┌─────────────▼─────────────┐
|
||||
│ rpm-ostreed Daemon │
|
||||
│ (Privileged Service) │
|
||||
└─────────────┬─────────────┘
|
||||
│
|
||||
┌───────────────────────┼───────────────────────┐
|
||||
│ │ │
|
||||
┌─────▼─────┐ ┌───────▼──────┐ ┌─────▼─────┐
|
||||
│ libdnf │ │ libostree │ │ System │
|
||||
│ (RPM/DNF) │ │ (Filesystem) │ │ Services │
|
||||
└───────────┘ └──────────────┘ └───────────┘
|
||||
```
|
||||
|
||||
### Design Principles
|
||||
|
||||
1. **Privilege Separation**: Daemon runs with elevated privileges, clients run unprivileged
|
||||
2. **D-Bus Communication**: Standard system service interface for inter-process communication
|
||||
3. **Transaction Management**: Atomic operations with rollback capability
|
||||
4. **Concurrent Operations**: Multiple clients can interact simultaneously
|
||||
5. **State Persistence**: Daemon maintains system state across operations
|
||||
|
||||
## Client Architecture
|
||||
|
||||
### CLI Client (`rpmostree`)
|
||||
|
||||
**Purpose**: Command-line interface for user interaction
|
||||
|
||||
**Key Components**:
|
||||
- **Command Parser**: Parse command-line arguments
|
||||
- **D-Bus Client**: Communicate with daemon
|
||||
- **Progress Handler**: Display operation progress
|
||||
- **Error Handler**: Handle and display errors
|
||||
|
||||
**Implementation**:
|
||||
```cpp
|
||||
class RpmOstreeClient {
|
||||
// D-Bus client
|
||||
std::unique_ptr<RpmOstreeClientLib> client_lib;
|
||||
|
||||
// Command dispatch
|
||||
int dispatch_command(int argc, char* argv[]);
|
||||
|
||||
// D-Bus communication
|
||||
bool connect_to_daemon();
|
||||
void handle_daemon_error(const std::string& error);
|
||||
|
||||
// Progress handling
|
||||
void handle_progress(const std::string& message, int percentage);
|
||||
void handle_completion(const std::string& result);
|
||||
};
|
||||
```
|
||||
|
||||
**Command Flow**:
|
||||
1. Parse command-line arguments
|
||||
2. Connect to daemon via D-Bus
|
||||
3. Send operation request
|
||||
4. Handle progress updates
|
||||
5. Display results or errors
|
||||
|
||||
### GUI Clients
|
||||
|
||||
**Purpose**: Graphical user interfaces for system management
|
||||
|
||||
**Components**:
|
||||
- **GNOME Software**: Integration with GNOME Software Center
|
||||
- **KDE Discover**: Integration with KDE Discover
|
||||
- **Custom GUIs**: Third-party graphical interfaces
|
||||
|
||||
**Implementation**:
|
||||
- Use D-Bus interface for system operations
|
||||
- Provide user-friendly progress indicators
|
||||
- Handle authentication via PolicyKit
|
||||
- Display system status and deployment information
|
||||
|
||||
### API Clients
|
||||
|
||||
**Purpose**: Programmatic interfaces for automation and integration
|
||||
|
||||
**Components**:
|
||||
- **Python Bindings**: Python library for rpm-ostree operations
|
||||
- **Go Bindings**: Go library for rpm-ostree operations
|
||||
- **REST APIs**: HTTP-based interfaces (planned)
|
||||
|
||||
**Implementation**:
|
||||
- Direct D-Bus communication
|
||||
- High-level abstractions for common operations
|
||||
- Error handling and recovery mechanisms
|
||||
- Async operation support
|
||||
|
||||
## Daemon Architecture
|
||||
|
||||
### Core Daemon (`rpm-ostreed`)
|
||||
|
||||
**Purpose**: Centralized system service for privileged operations
|
||||
|
||||
**Key Components**:
|
||||
- **D-Bus Service**: Expose system management interface
|
||||
- **Transaction Manager**: Handle atomic operations
|
||||
- **State Manager**: Maintain system state
|
||||
- **Resource Manager**: Manage system resources
|
||||
|
||||
**Implementation**:
|
||||
```cpp
|
||||
class RpmOstreeDaemon {
|
||||
// Global state management
|
||||
std::unique_ptr<RpmOstreeSysroot> sysroot;
|
||||
std::unique_ptr<RpmOstreeOS> os;
|
||||
|
||||
// Transaction management
|
||||
std::map<std::string, std::unique_ptr<RpmOstreeTransaction>> transactions;
|
||||
|
||||
// D-Bus interface
|
||||
std::unique_ptr<GDBusObjectManagerServer> object_manager;
|
||||
|
||||
// Service management
|
||||
void start_service();
|
||||
void stop_service();
|
||||
void handle_client_connection(GDBusConnection* connection);
|
||||
};
|
||||
```
|
||||
|
||||
**Service Lifecycle**:
|
||||
1. Initialize system components
|
||||
2. Register D-Bus service
|
||||
3. Start listening for client connections
|
||||
4. Handle client requests
|
||||
5. Clean up on shutdown
|
||||
|
||||
### D-Bus Interface
|
||||
|
||||
**Service Name**: `org.projectatomic.rpmostree1`
|
||||
|
||||
**Main Objects**:
|
||||
- `/org/projectatomic/rpmostree1/Sysroot`: System root management
|
||||
- `/org/projectatomic/rpmostree1/OS`: Operating system operations
|
||||
|
||||
**Key Methods**:
|
||||
```xml
|
||||
<interface name="org.projectatomic.rpmostree1.OS">
|
||||
<method name="Upgrade">
|
||||
<arg name="options" type="a{sv}" direction="in"/>
|
||||
<arg name="transaction_address" type="s" direction="out"/>
|
||||
</method>
|
||||
|
||||
<method name="Rollback">
|
||||
<arg name="options" type="a{sv}" direction="in"/>
|
||||
<arg name="transaction_address" type="s" direction="out"/>
|
||||
</method>
|
||||
|
||||
<method name="Deploy">
|
||||
<arg name="ref" type="s" direction="in"/>
|
||||
<arg name="options" type="a{sv}" direction="in"/>
|
||||
<arg name="transaction_address" type="s" direction="out"/>
|
||||
</method>
|
||||
|
||||
<method name="Rebase">
|
||||
<arg name="ref" type="s" direction="in"/>
|
||||
<arg name="options" type="a{sv}" direction="in"/>
|
||||
<arg name="transaction_address" type="s" direction="out"/>
|
||||
</method>
|
||||
|
||||
<method name="PkgChange">
|
||||
<arg name="packages" type="as" direction="in"/>
|
||||
<arg name="change_type" type="s" direction="in"/>
|
||||
<arg name="options" type="a{sv}" direction="in"/>
|
||||
<arg name="transaction_address" type="s" direction="out"/>
|
||||
</method>
|
||||
|
||||
<method name="KernelArgs">
|
||||
<arg name="operation" type="s" direction="in"/>
|
||||
<arg name="args" type="as" direction="in"/>
|
||||
<arg name="options" type="a{sv}" direction="in"/>
|
||||
<arg name="transaction_address" type="s" direction="out"/>
|
||||
</method>
|
||||
|
||||
<method name="Cleanup">
|
||||
<arg name="options" type="a{sv}" direction="in"/>
|
||||
<arg name="transaction_address" type="s" direction="out"/>
|
||||
</method>
|
||||
</interface>
|
||||
```
|
||||
|
||||
**Signals**:
|
||||
```xml
|
||||
<signal name="TransactionChanged">
|
||||
<arg name="transaction_address" type="s"/>
|
||||
<arg name="state" type="s"/>
|
||||
<arg name="message" type="s"/>
|
||||
<arg name="percentage" type="i"/>
|
||||
</signal>
|
||||
|
||||
<signal name="TransactionCompleted">
|
||||
<arg name="transaction_address" type="s"/>
|
||||
<arg name="success" type="b"/>
|
||||
<arg name="result" type="s"/>
|
||||
</signal>
|
||||
```
|
||||
|
||||
### Transaction Management
|
||||
|
||||
**Purpose**: Handle atomic operations with rollback capability
|
||||
|
||||
**Transaction Types**:
|
||||
1. **DeployTransaction**: New deployment creation
|
||||
2. **RollbackTransaction**: Deployment rollback
|
||||
3. **PkgChangeTransaction**: Package installation/removal
|
||||
4. **RebaseTransaction**: Base image switching
|
||||
5. **UpgradeTransaction**: System upgrades
|
||||
|
||||
**Implementation**:
|
||||
```cpp
|
||||
class RpmOstreeTransaction {
|
||||
// Transaction state
|
||||
TransactionState state;
|
||||
std::string transaction_id;
|
||||
TransactionType type;
|
||||
|
||||
// Rollback information
|
||||
std::vector<RollbackPoint> rollback_points;
|
||||
|
||||
// Progress reporting
|
||||
void emit_progress(const std::string& message, int percentage);
|
||||
void emit_completion(bool success, const std::string& result);
|
||||
|
||||
// Atomic execution
|
||||
bool execute_atomic();
|
||||
void rollback_on_failure();
|
||||
|
||||
// State management
|
||||
void set_state(TransactionState new_state);
|
||||
TransactionState get_state() const;
|
||||
};
|
||||
```
|
||||
|
||||
**Transaction Lifecycle**:
|
||||
1. **Initiation**: Client requests operation
|
||||
2. **Validation**: Validate request parameters
|
||||
3. **Preparation**: Set up rollback points
|
||||
4. **Execution**: Perform operation with progress reporting
|
||||
5. **Completion**: Finalize operation or rollback
|
||||
6. **Cleanup**: Clean up resources
|
||||
|
||||
### State Management
|
||||
|
||||
**Purpose**: Maintain system state across operations
|
||||
|
||||
**State Components**:
|
||||
- **Deployment State**: Current and available deployments
|
||||
- **Package State**: Installed and layered packages
|
||||
- **Configuration State**: System configuration
|
||||
- **Transaction State**: Active and completed transactions
|
||||
|
||||
**Implementation**:
|
||||
```cpp
|
||||
class StateManager {
|
||||
// System state
|
||||
std::unique_ptr<DeploymentState> deployment_state;
|
||||
std::unique_ptr<PackageState> package_state;
|
||||
std::unique_ptr<ConfigurationState> config_state;
|
||||
|
||||
// State persistence
|
||||
void save_state();
|
||||
void load_state();
|
||||
void sync_state();
|
||||
|
||||
// State queries
|
||||
DeploymentInfo get_current_deployment();
|
||||
std::vector<DeploymentInfo> get_available_deployments();
|
||||
std::vector<PackageInfo> get_installed_packages();
|
||||
};
|
||||
```
|
||||
|
||||
## Communication Protocol
|
||||
|
||||
### D-Bus Communication
|
||||
|
||||
**Connection Setup**:
|
||||
```cpp
|
||||
// Client connection
|
||||
GDBusConnection* connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, nullptr, nullptr);
|
||||
|
||||
// Service registration
|
||||
GDBusObjectManagerServer* object_manager = g_dbus_object_manager_server_new("/org/projectatomic/rpmostree1");
|
||||
```
|
||||
|
||||
**Method Calls**:
|
||||
```cpp
|
||||
// Client method call
|
||||
GVariant* result = g_dbus_connection_call_sync(
|
||||
connection,
|
||||
"org.projectatomic.rpmostree1",
|
||||
"/org/projectatomic/rpmostree1/OS",
|
||||
"org.projectatomic.rpmostree1.OS",
|
||||
"Upgrade",
|
||||
g_variant_new("(a{sv})", options),
|
||||
nullptr,
|
||||
G_DBUS_CALL_FLAGS_NONE,
|
||||
-1,
|
||||
nullptr,
|
||||
nullptr
|
||||
);
|
||||
```
|
||||
|
||||
**Signal Handling**:
|
||||
```cpp
|
||||
// Client signal connection
|
||||
g_dbus_connection_signal_subscribe(
|
||||
connection,
|
||||
"org.projectatomic.rpmostree1",
|
||||
"org.projectatomic.rpmostree1.OS",
|
||||
"TransactionChanged",
|
||||
"/org/projectatomic/rpmostree1/OS",
|
||||
nullptr,
|
||||
G_DBUS_SIGNAL_FLAGS_NONE,
|
||||
handle_transaction_changed,
|
||||
nullptr,
|
||||
nullptr
|
||||
);
|
||||
```
|
||||
|
||||
### Error Handling
|
||||
|
||||
**Error Types**:
|
||||
1. **Network Errors**: Package download failures
|
||||
2. **Dependency Errors**: Package dependency conflicts
|
||||
3. **Filesystem Errors**: OSTree operation failures
|
||||
4. **Permission Errors**: Insufficient privileges
|
||||
5. **Transaction Errors**: Transaction failures
|
||||
|
||||
**Error Propagation**:
|
||||
```cpp
|
||||
// Daemon error handling
|
||||
void handle_error(const std::string& error, GDBusMethodInvocation* invocation) {
|
||||
GError* g_error = g_error_new_literal(
|
||||
G_DBUS_ERROR,
|
||||
G_DBUS_ERROR_FAILED,
|
||||
error.c_str()
|
||||
);
|
||||
g_dbus_method_invocation_return_gerror(invocation, g_error);
|
||||
g_error_free(g_error);
|
||||
}
|
||||
|
||||
// Client error handling
|
||||
void handle_daemon_error(GError* error) {
|
||||
std::string error_message = error->message;
|
||||
std::cerr << "Error: " << error_message << std::endl;
|
||||
|
||||
// Provide user guidance based on error type
|
||||
if (g_error_matches(error, G_DBUS_ERROR, G_DBUS_ERROR_SERVICE_UNKNOWN)) {
|
||||
std::cerr << "Daemon is not running. Please start the rpm-ostreed service." << std::endl;
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Security Model
|
||||
|
||||
### Privilege Separation
|
||||
|
||||
**Principle**: Separate privileged operations from unprivileged user operations
|
||||
|
||||
**Implementation**:
|
||||
- **Daemon**: Runs with elevated privileges (root)
|
||||
- **Client**: Runs with user privileges
|
||||
- **D-Bus**: Secure communication channel
|
||||
- **PolicyKit**: Authentication for privileged operations
|
||||
|
||||
### Authentication
|
||||
|
||||
**PolicyKit Integration**:
|
||||
```xml
|
||||
<policyconfig>
|
||||
<action id="org.projectatomic.rpmostree1.upgrade">
|
||||
<description>Upgrade system</description>
|
||||
<message>Authentication is required to upgrade the system</message>
|
||||
<defaults>
|
||||
<allow_any>auth_admin</allow_any>
|
||||
<allow_inactive>auth_admin</allow_inactive>
|
||||
<allow_active>auth_admin</allow_active>
|
||||
</defaults>
|
||||
<annotate key="org.freedesktop.policykit.exec.path">/usr/libexec/rpm-ostreed</annotate>
|
||||
</action>
|
||||
</policyconfig>
|
||||
```
|
||||
|
||||
### Sandboxing
|
||||
|
||||
**Package Script Execution**:
|
||||
- Execute package scripts in controlled environment
|
||||
- Use namespace isolation for security
|
||||
- Restrict filesystem access
|
||||
- Limit privilege escalation
|
||||
|
||||
## Concurrent Operations
|
||||
|
||||
### Multiple Clients
|
||||
|
||||
**Support**: Multiple clients can interact with daemon simultaneously
|
||||
|
||||
**Implementation**:
|
||||
- **Thread-Safe Operations**: All operations are thread-safe
|
||||
- **Transaction Isolation**: Each operation gets its own transaction
|
||||
- **Resource Locking**: Prevent conflicting operations
|
||||
- **Queue Management**: Queue operations when necessary
|
||||
|
||||
### Operation Queuing
|
||||
|
||||
**Queue Management**:
|
||||
```cpp
|
||||
class OperationQueue {
|
||||
std::queue<Operation> pending_operations;
|
||||
std::mutex queue_mutex;
|
||||
std::condition_variable queue_cv;
|
||||
|
||||
void enqueue_operation(const Operation& operation);
|
||||
Operation dequeue_operation();
|
||||
bool has_pending_operations();
|
||||
};
|
||||
```
|
||||
|
||||
## Performance Optimization
|
||||
|
||||
### Resource Management
|
||||
|
||||
**Memory Management**:
|
||||
- Efficient memory usage for large operations
|
||||
- Garbage collection for completed transactions
|
||||
- Memory pooling for frequently allocated objects
|
||||
|
||||
**Disk Management**:
|
||||
- OSTree deduplication for storage efficiency
|
||||
- Temporary file cleanup
|
||||
- Cache management for package downloads
|
||||
|
||||
**Network Optimization**:
|
||||
- Parallel package downloads
|
||||
- Connection pooling
|
||||
- Bandwidth optimization
|
||||
|
||||
### Caching
|
||||
|
||||
**Package Cache**:
|
||||
- Cache downloaded packages
|
||||
- Cache package metadata
|
||||
- Cache dependency resolution results
|
||||
|
||||
**State Cache**:
|
||||
- Cache deployment information
|
||||
- Cache package lists
|
||||
- Cache configuration data
|
||||
|
||||
## Monitoring and Logging
|
||||
|
||||
### Logging
|
||||
|
||||
**Log Levels**:
|
||||
- **DEBUG**: Detailed debugging information
|
||||
- **INFO**: General information
|
||||
- **WARNING**: Warning messages
|
||||
- **ERROR**: Error messages
|
||||
- **CRITICAL**: Critical errors
|
||||
|
||||
**Log Implementation**:
|
||||
```cpp
|
||||
class Logger {
|
||||
void debug(const std::string& message);
|
||||
void info(const std::string& message);
|
||||
void warning(const std::string& message);
|
||||
void error(const std::string& message);
|
||||
void critical(const std::string& message);
|
||||
};
|
||||
```
|
||||
|
||||
### Monitoring
|
||||
|
||||
**Health Monitoring**:
|
||||
- Daemon health checks
|
||||
- Transaction monitoring
|
||||
- Resource usage monitoring
|
||||
- Error rate monitoring
|
||||
|
||||
**Metrics Collection**:
|
||||
- Operation success rates
|
||||
- Performance metrics
|
||||
- Resource usage statistics
|
||||
- Error statistics
|
||||
|
||||
## Systemd Integration
|
||||
|
||||
### Service Definition
|
||||
|
||||
**Service File**: `/usr/lib/systemd/system/rpm-ostreed.service`
|
||||
|
||||
```ini
|
||||
[Unit]
|
||||
Description=rpm-ostree Daemon
|
||||
Documentation=man:rpm-ostreed(8)
|
||||
After=network.target
|
||||
|
||||
[Service]
|
||||
Type=dbus
|
||||
BusName=org.projectatomic.rpmostree1
|
||||
ExecStart=/usr/libexec/rpm-ostreed
|
||||
Restart=on-failure
|
||||
RestartSec=1
|
||||
User=root
|
||||
Group=root
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target
|
||||
Also=rpm-ostreed.socket
|
||||
```
|
||||
|
||||
### D-Bus Activation
|
||||
|
||||
**Socket File**: `/usr/lib/systemd/system/rpm-ostreed.socket`
|
||||
|
||||
```ini
|
||||
[Unit]
|
||||
Description=rpm-ostree D-Bus Socket
|
||||
Documentation=man:rpm-ostreed(8)
|
||||
|
||||
[Socket]
|
||||
ListenStream=/run/dbus/system_bus_socket
|
||||
SocketUser=root
|
||||
SocketGroup=root
|
||||
|
||||
[Install]
|
||||
WantedBy=sockets.target
|
||||
```
|
||||
|
||||
## Error Recovery
|
||||
|
||||
### Automatic Recovery
|
||||
|
||||
**Transaction Rollback**:
|
||||
- Automatic rollback on transaction failure
|
||||
- State restoration to previous known good state
|
||||
- Resource cleanup after rollback
|
||||
|
||||
**Daemon Recovery**:
|
||||
- Automatic daemon restart on failure
|
||||
- State recovery on daemon restart
|
||||
- Transaction recovery for incomplete operations
|
||||
|
||||
### Manual Recovery
|
||||
|
||||
**Recovery Procedures**:
|
||||
- Manual rollback procedures
|
||||
- State reset procedures
|
||||
- Configuration recovery procedures
|
||||
- Filesystem recovery procedures
|
||||
|
||||
## Future Enhancements
|
||||
|
||||
### Planned Features
|
||||
|
||||
1. **Container Integration**: Direct container support
|
||||
2. **Cloud Integration**: Cloud deployment support
|
||||
3. **Advanced Monitoring**: Enhanced monitoring capabilities
|
||||
4. **Performance Optimization**: Further performance improvements
|
||||
|
||||
### Architecture Improvements
|
||||
|
||||
1. **Microservices**: Split daemon into microservices
|
||||
2. **API Gateway**: REST API gateway for external access
|
||||
3. **Event Streaming**: Event streaming for real-time updates
|
||||
4. **Distributed Operations**: Support for distributed operations
|
||||
Loading…
Add table
Add a link
Reference in a new issue