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

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

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

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

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

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OSTree Filesystem Integration Guide

Overview

This document combines research on OSTree, atomic filesystems, and live layering for apt-ostree integration.

OSTree Filesystem Research

Core Concepts

  • Content-addressed storage: Files identified by content hash
  • Atomic commits: All-or-nothing filesystem changes
  • Deployment management: Multiple bootable filesystem versions
  • Rollback support: Instant reversion to previous state

Key Components

  • ostree: Core filesystem management tool
  • libostree: OSTree library for programmatic access
  • ostree-admin: System administration commands
  • ostree-repo: Repository management

Atomic Filesystems

Principles

  • "From Scratch" Philosophy: Every change regenerates target filesystem completely
  • No hysteresis: State-independent behavior
  • Reproducible results: Consistent outcomes
  • System consistency: Maintained integrity

Implementation

  • Complete filesystem regeneration
  • Atomic transaction handling
  • Rollback capability
  • State synchronization

Live Layering

Concept

  • Immutable base: Base image remains unchanged
  • Layered packages: User packages layered on top
  • Clear separation: Base vs. user content distinction

Benefits

  • Predictable behavior
  • Easy rollback
  • Consistent deployments
  • Simplified debugging

Integration Strategy

Filesystem Assembly

  • OSTree commit extraction
  • Package layer application
  • Filesystem assembly
  • Boot configuration

Transaction Management

  • Atomic operations
  • Rollback support
  • State tracking
  • Error recovery

Deployment Workflow

  1. Create OSTree commit from base
  2. Apply package layers
  3. Generate deployment
  4. Update bootloader
  5. Activate deployment

Technical Implementation

OSTree Integration

  • Commit creation and management
  • Deployment tracking
  • Rollback implementation
  • Repository management

Package Layer Management

  • Layer creation and application
  • Dependency resolution
  • Conflict handling
  • State synchronization

Boot Integration

  • GRUB/systemd-boot configuration
  • Kernel parameter management
  • Initramfs handling
  • Boot verification

References

  • See .notes/research/ostree.md for detailed OSTree research
  • See .notes/research/atomic-filesystems.md for atomic filesystem concepts
  • See .notes/research/live-layering.md for live layering techniques
  • See .notes/research/composefs.md for Composefs research