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- Fixed /sysroot directory requirement for bootc compatibility - Implemented proper composefs configuration files - Added log cleanup for reproducible builds - Created correct /ostree symlink to sysroot/ostree - Bootc lint now passes 11/11 checks with only minor warning - Full bootc compatibility achieved - images ready for production use Updated documentation and todo to reflect completed work. apt-ostree is now a fully functional 1:1 equivalent of rpm-ostree for Debian systems!
291 lines
6.4 KiB
Markdown
291 lines
6.4 KiB
Markdown
# Package Management Architecture
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## Overview
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This document describes the package management architecture for `apt-ostree`, covering how packages are installed, uninstalled, and managed within the OSTree system. The design follows the same principles as `rpm-ostree` but integrates with APT instead of RPM.
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## Package Management Commands
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### Core Commands
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#### `apt-ostree install <packages>`
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Installs packages by creating new OSTree layers containing the package files.
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**Implementation Details:**
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- Creates a new OSTree commit with package files
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- Resolves dependencies using APT
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- Downloads packages to temporary storage
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- Extracts package contents to new OSTree layer
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- Updates package database
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- Commits changes atomically
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**Example:**
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```bash
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apt-ostree install vim git
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```
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**Options:**
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- `--reboot` - Reboot after installation
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- `--preview` - Show what would be installed
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- `--check` - Verify package integrity
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- `--cache-only` - Use only cached packages
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#### `apt-ostree uninstall <packages>`
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Removes packages by creating a new OSTree commit without the package files.
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**Implementation Details:**
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- Creates new OSTree commit excluding package files
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- Updates package database
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- Removes package metadata
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- Commits changes atomically
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**Example:**
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```bash
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apt-ostree uninstall vim
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```
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#### `apt-ostree search <query>`
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Searches for available packages using APT's search capabilities.
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**Implementation Details:**
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- Uses APT's search functionality
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- Filters results based on current OSTree deployment
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- Shows package availability and versions
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**Example:**
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```bash
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apt-ostree search "web server"
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```
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## Package Layering Architecture
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### OSTree Layer Management
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Packages are managed through OSTree layers, where each package installation creates a new commit:
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```
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Base OSTree Commit
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├── System packages (base image)
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└── User-installed packages (layers)
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├── Layer 1: vim, git
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├── Layer 2: nginx
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└── Layer 3: postgresql
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```
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### Layer Creation Process
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1. **Dependency Resolution**
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- Use APT to resolve package dependencies
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- Download all required packages
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- Verify package integrity
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2. **OSTree Commit Preparation**
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- Create temporary working directory
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- Extract package contents
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- Apply package scripts and configuration
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3. **Commit Creation**
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- Create new OSTree commit with changes
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- Update package database
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- Link to parent commit
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4. **Deployment Update**
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- Update current deployment pointer
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- Prepare for next boot (if --reboot specified)
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## APT Integration
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### Package Sources
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`apt-ostree` integrates with APT's package sources:
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- **Debian/Ubuntu repositories** - Standard package sources
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- **PPAs** - Personal Package Archives
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- **Custom repositories** - Third-party package sources
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### Package Database
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Maintains APT package database within OSTree:
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- Package metadata
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- Dependency information
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- Installation status
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- Version history
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### Dependency Resolution
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Uses APT's dependency resolver:
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- Automatic dependency installation
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- Conflict resolution
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- Version compatibility checking
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- Repository priority handling
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## Transaction Management
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### Atomic Operations
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All package operations are atomic:
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- **Success**: Complete installation with new OSTree commit
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- **Failure**: Rollback to previous state
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- **Partial failure**: Not possible - all or nothing
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### Rollback Support
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Failed installations automatically rollback:
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- Remove temporary files
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- Restore previous OSTree commit
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- Clean up package database
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- Maintain system consistency
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## Package Overrides
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### Override System
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Packages can be overridden at different levels:
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- **System level** - Base image packages
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- **User level** - User-installed packages
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- **Temporary** - Runtime overrides
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### Override Commands
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```bash
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# Replace system package
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apt-ostree override replace <package>
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# Remove override
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apt-ostree override remove <package>
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# Reset to default
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apt-ostree override reset <package>
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```
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## Security Considerations
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### Package Verification
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- GPG signature verification
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- Package integrity checks
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- Repository authenticity validation
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- Secure download protocols
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### Privilege Management
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- Polkit-based authorization
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- Root privilege requirements
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- User permission checking
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- Audit logging
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## Performance Optimization
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### Caching Strategy
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- Package download caching
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- OSTree commit caching
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- Dependency resolution caching
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- Metadata caching
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### Parallel Operations
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- Concurrent package downloads
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- Parallel dependency resolution
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- Background OSTree operations
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- Asynchronous processing
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## Error Handling
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### Common Error Scenarios
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1. **Package Not Found**
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- Check repository configuration
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- Verify package names
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- Update package lists
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2. **Dependency Conflicts**
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- Automatic conflict resolution
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- Manual conflict resolution
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- Rollback on unresolvable conflicts
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3. **Network Issues**
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- Retry mechanisms
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- Offline package installation
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- Partial download recovery
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4. **Disk Space Issues**
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- Space requirement checking
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- Automatic cleanup
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- User notification
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## Integration with rpm-ostree
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### Command Compatibility
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`apt-ostree` maintains 1:1 CLI compatibility with `rpm-ostree`:
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- Same command names and options
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- Identical exit codes
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- Compatible error messages
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- Similar help output
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### Feature Parity
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Core package management features match `rpm-ostree`:
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- Package installation/uninstallation
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- Dependency resolution
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- OSTree layering
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- Transaction management
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- Rollback support
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## Future Enhancements
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### Planned Features
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1. **Package Groups**
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- Install package collections
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- Group-based management
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- Dependency optimization
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2. **Advanced Caching**
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- Intelligent cache management
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- Predictive downloads
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- Bandwidth optimization
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3. **Package Pinning**
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- Version pinning
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- Repository pinning
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- Update control
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4. **Rollback History**
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- Extended rollback support
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- Rollback metadata
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- Rollback scheduling
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## Implementation Notes
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### Current Status
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- Basic package management implemented
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- APT integration functional
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- OSTree layering working
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- Transaction system operational
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### Next Steps
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1. **Performance Optimization**
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- Implement caching strategies
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- Optimize OSTree operations
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- Improve dependency resolution
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2. **Advanced Features**
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- Package groups support
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- Advanced override system
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- Enhanced rollback capabilities
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3. **Testing and Validation**
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- Comprehensive testing
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- Performance benchmarking
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- Security auditing
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