Initial commit: Particle-OS tools repository

- Complete Particle-OS rebranding from uBlue-OS - Professional installation system with standardized paths - Self-initialization system with --init and --reset commands - Enhanced error messages and dependency checking - Comprehensive testing infrastructure - All source scriptlets updated with runtime improvements - Clean codebase with redundant files moved to archive - Complete documentation suite
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+# Ubuntu uBlue System Tools
+
+A comprehensive collection of tools for creating and managing immutable Ubuntu systems, providing functionality similar to Fedora Silverblue/Kinoite but designed specifically for Ubuntu/Debian-based distributions.
+
+## 🎯 Overview
+
+Ubuntu uBlue System Tools provides a complete solution for immutable Ubuntu systems using:
+- **ComposeFS Alternative**: Immutable filesystem backend using squashfs and overlayfs
+- **apt-layer**: Package management and layer creation (similar to rpm-ostree)
+- **bootupd Alternative**: Bootloader management and deployment
+- **Live Overlay System**: Temporary package installation without rebooting
+- **OCI Integration**: Container image export/import capabilities
+- **Transaction Management**: Atomic operations with rollback support
+- **fsverity**: File integrity verification and signing
+
+## 🏗️ System Architecture
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                    Ubuntu uBlue System                      │
+├─────────────────────────────────────────────────────────────┤
+│  main.sh (Orchestrator)                                     │
+│  ┌─────────────┬─────────────┬─────────────┐                │
+│  │ apt-layer.sh│composefs-alt│bootupd-alt  │                │
+│  │             │             │             │                │
+│  │ • Package   │ • Immutable │ • Bootloader│                │
+│  │   layers    │   filesystem│   management│                │
+│  │ • Live      │ • SquashFS  │ • UEFI/GRUB │                │
+│  │   overlay   │ • OverlayFS │ • Deployment│                │
+│  └─────────────┴─────────────┴─────────────┘                │
+├─────────────────────────────────────────────────────────────┤
+│  Supporting Tools                                           │
+│  • oci-integration.sh    • ublue-config.sh                 │
+│  • bootc-alternative.sh  • ublue-logrotate.sh              │
+│  • dracut-module.sh      • install-ubuntu-ublue.sh         │
+│  • fsverity-utils        • Integrity verification          │
+└─────────────────────────────────────────────────────────────┘
+```
+
+## 🚀 Quick Start
+
+### Installation
+
+```bash
+# Clone the repository
+git clone <repository-url>
+cd tools
+
+# Run the installation script
+sudo ./install-ubuntu-ublue.sh
+
+# Verify installation
+sudo ./test-integration.sh
+```
+
+### Basic Usage
+
+```bash
+# Install packages and create new system image
+sudo ./main.sh install ubuntu-base-24.04 firefox steam
+
+# Install packages on live system (no reboot required)
+sudo ./apt-layer.sh --live-install firefox steam
+
+# Commit live changes to permanent layer
+sudo ./apt-layer.sh --live-commit "Add gaming packages"
+
+# Rebase to new Ubuntu version
+sudo ./main.sh rebase ubuntu-base-25.04
+
+# Rollback to previous deployment
+sudo ./main.sh rollback
+
+# Check system status
+sudo ./main.sh status
+```
+
+## 📦 Core Components
+
+### 1. **main.sh** - System Orchestrator
+The central orchestrator that coordinates all uBlue operations:
+- **Package Installation**: Atomic package installation with new image creation
+- **System Rebase**: Upgrade to new base images while preserving layers
+- **Rollback Management**: Safe rollback to previous deployments
+- **Transaction Management**: Atomic operations with automatic rollback
+
+**Usage:**
+```bash
+sudo ./main.sh install <base-image> <package1> [package2]...
+sudo ./main.sh rebase <new-base-image>
+sudo ./main.sh rollback [target-image]
+sudo ./main.sh status
+```
+
+### 2. **apt-layer.sh** - Package Layer Management
+Advanced package management with layer-based approach:
+- **Layer Creation**: Create new system layers with packages
+- **Live Overlay**: Install packages without rebooting
+- **Container Support**: Build layers in containers for isolation
+- **Transaction Safety**: Atomic layer operations with rollback
+- **OCI Integration**: Export/import layers as container images
+
+**Usage:**
+```bash
+# Create new layer (traditional chroot-based)
+sudo ./apt-layer.sh ubuntu-base/24.04 gaming/24.04 steam wine
+
+# Create layer with container isolation
+sudo ./apt-layer.sh --container ubuntu-base/24.04 dev/24.04 vscode git
+
+# Live package installation (no reboot required)
+sudo ./apt-layer.sh --live-install firefox
+
+# Commit live changes to permanent layer
+sudo ./apt-layer.sh --live-commit "Add browser"
+
+# Export layer as OCI container image
+sudo ./apt-layer.sh --oci-export gaming/24.04 my-registry/gaming:latest
+
+# List all layers
+sudo ./apt-layer.sh --list
+
+# Rollback to previous layer
+sudo ./apt-layer.sh --rollback gaming/24.04
+```
+
+### 3. **composefs-alternative.sh** - Immutable Filesystem
+Provides immutable filesystem functionality using squashfs and overlayfs:
+- **Image Creation**: Create compressed system images
+- **Layer Management**: Manage multiple filesystem layers
+- **Mount Management**: Mount/unmount images with overlay support
+- **Content Verification**: Hash-based content verification
+
+**Usage:**
+```bash
+# Create image from directory
+sudo ./composefs-alternative.sh create my-image /path/to/rootfs
+
+# Mount image
+sudo ./composefs-alternative.sh mount my-image /mnt/point
+
+# List images
+sudo ./composefs-alternative.sh list-images
+
+# Remove image
+sudo ./composefs-alternative.sh remove my-image
+```
+
+### 4. **bootupd-alternative.sh** - Bootloader Management
+Manages bootloader configuration and deployment:
+- **UEFI Support**: Full UEFI bootloader management
+- **GRUB Integration**: GRUB configuration and updates
+- **Deployment**: Deploy new images as bootable entries
+- **Rollback**: Safe bootloader rollback capabilities
+- **Multi-bootloader Support**: UEFI, GRUB, LILO, syslinux
+
+**Usage:**
+```bash
+# Set default boot entry
+sudo ./bootupd-alternative.sh set-default my-image
+
+# List boot entries
+sudo ./bootupd-alternative.sh list-entries
+
+# Check status
+sudo ./bootupd-alternative.sh status
+
+# Rollback bootloader
+sudo ./bootupd-alternative.sh rollback
+
+# Register new image with bootloader
+sudo ./bootupd-alternative.sh register my-image
+```
+
+## 🔧 Supporting Tools
+
+### **oci-integration.sh**
+OCI container image export/import for ComposeFS images:
+```bash
+# Export layer as OCI image
+sudo ./oci-integration.sh export my-layer my-registry/my-image:latest
+
+# Import OCI image as layer
+sudo ./oci-integration.sh import my-registry/my-image:latest my-layer
+
+# List available OCI images
+sudo ./oci-integration.sh list
+```
+
+### **bootc-alternative.sh**
+Container-native bootable image system:
+```bash
+# Create bootable container image
+sudo ./bootc-alternative.sh create ubuntu:24.04 my-bootable-image
+
+# Deploy container as bootable system
+sudo ./bootc-alternative.sh deploy my-bootable-image
+
+# Update to new container image
+sudo ./bootc-alternative.sh update my-container:v2.0
+
+# Rollback to previous image
+sudo ./bootc-alternative.sh rollback
+```
+
+### **ublue-config.sh**
+Unified configuration system:
+```bash
+# Show configuration
+sudo ./ublue-config.sh show
+
+# Update configuration
+sudo ./ublue-config.sh update
+
+# Validate configuration
+sudo ./ublue-config.sh validate
+```
+
+### **ublue-logrotate.sh**
+Log rotation and maintenance:
+```bash
+# Rotate oversized logs
+sudo ./ublue-logrotate.sh rotate
+
+# Clean up old logs
+sudo ./ublue-logrotate.sh cleanup
+
+# Show log statistics
+sudo ./ublue-logrotate.sh stats
+```
+
+## 🧪 Testing
+
+Comprehensive test suite for all components:
+
+```bash
+# Run full integration tests
+sudo ./test-integration.sh
+
+# Test specific components
+sudo ./test-apt-layer.sh
+sudo ./test-composefs-integration.sh
+```
+
+## 📋 Requirements
+
+### System Requirements
+- **OS**: Ubuntu 22.04+ / Debian 12+ / Pop!_OS 22.04+
+- **Architecture**: x86_64, ARM64
+- **Boot**: UEFI or Legacy BIOS
+- **Storage**: 20GB+ free space
+- **Memory**: 4GB+ RAM
+
+### Dependencies
+```bash
+# Core dependencies
+sudo apt install squashfs-tools jq rsync mount losetup
+
+# Bootloader dependencies
+sudo apt install grub-efi-amd64 efibootmgr
+
+# File integrity verification
+sudo apt install fsverity-utils
+
+# Container dependencies (optional)
+sudo apt install podman docker.io
+```
+
+## 🔒 Security Features
+
+- **Immutable Design**: System images cannot be modified at runtime
+- **Content Verification**: SHA256 hash verification of all content
+- **Transaction Safety**: Atomic operations with automatic rollback
+- **Isolation**: Container-based layer building for security
+- **Audit Logging**: Comprehensive logging of all operations
+- **Command Injection Protection**: Safe command execution without eval
+- **Resource Cleanup**: Automatic cleanup of temporary files and mounts
+- **Path Validation**: Input sanitization and path traversal protection
+
+## 📚 Documentation
+
+Detailed documentation is available in the `docs/` directory:
+
+- **[apt-layer/](docs/apt-layer/)**: Complete apt-layer.sh documentation
+- **[composefs/](docs/composefs/)**: ComposeFS alternative documentation  
+- **[bootupd/](docs/bootupd/)**: Bootloader management documentation
+- **[bootc/](docs/bootc/)**: Container-native booting documentation
+
+## 🚧 Development Status
+
+| Component | Status | Notes |
+|-----------|--------|-------|
+| apt-layer.sh | ✅ Production Ready | Full layer management with live overlay, OCI integration |
+| composefs-alternative.sh | ✅ Production Ready | Immutable filesystem backend with squashfs/overlayfs |
+| bootupd-alternative.sh | ✅ Production Ready | Multi-bootloader support (UEFI, GRUB, LILO, syslinux) |
+| main.sh | ✅ Production Ready | System orchestrator with transaction management |
+| oci-integration.sh | ✅ Production Ready | Container image export/import |
+| ublue-config.sh | ✅ Production Ready | Unified configuration system |
+| ublue-logrotate.sh | ✅ Production Ready | Log rotation and maintenance |
+| bootc-alternative.sh | 🔄 In Development | Container-native booting |
+
+## 🤝 Contributing
+
+This project welcomes contributions! Please see the individual component documentation for development guidelines.
+
+### Development Setup
+```bash
+# Clone repository
+git clone <repository-url>
+cd tools
+
+# Install development dependencies
+sudo ./install-ubuntu-ublue.sh --dev
+
+# Run tests
+sudo ./test-integration.sh
+
+# Run component-specific tests
+sudo ./test-apt-layer.sh
+sudo ./test-composefs-integration.sh
+```
+
+### Development Guidelines
+- Follow the existing code style and patterns
+- Add comprehensive error handling and logging
+- Include tests for new features
+- Update documentation for any API changes
+- Ensure all operations are atomic with rollback support
+
+## 📄 License
+
+This project is open source. Please check individual component licenses.
+
+## 🆘 Support
+
+- **Issues**: Report bugs and feature requests via GitHub issues
+- **Documentation**: Check the `docs/` directory for detailed guides
+- **Testing**: Run `./test-integration.sh` for system diagnostics
+- **Troubleshooting**: Check component-specific troubleshooting guides in `docs/`
+- **Security**: Review security analysis in `docs/apt-layer/AGGRESSIVE-SCRUTINY-RESPONSE.md`
+
+---
+
+**Note**: All tools are designed to work 1:1 with their official counterparts and are compatible with Ubuntu, Debian, and Pop!_OS systems.