From b65bf5f4e8a906ed94fa69df9419bac9722bd05f Mon Sep 17 00:00:00 2001 From: robojerk Date: Tue, 12 Aug 2025 00:36:55 -0700 Subject: [PATCH] docs: Add comprehensive bootupd integration and bootloader management documentation - Added detailed explanation of what bootupd is and how it works - Documented bootupd vs GRUB2 strategy in particle-os - Explained bootupd architecture and required components - Added future bootupd stage implementation examples - Documented bootupd vs bootc relationship and integration - Added migration path from GRUB2 to bootupd - Included bootupd in CI/CD pipeline examples - Added future roadmap for bootupd integration This provides users with complete understanding of current bootloader implementation and future direction for modern OSTree systems. --- README.md | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 152 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 4fbd1c6..9fb9f79 100644 --- a/README.md +++ b/README.md @@ -57,8 +57,6 @@ particle-os extends osbuild with **10 Debian-specific stages** and **Debian-spec ## 🔗 osbuild and bootc-image-builder Integration -### What is bootc-image-builder? - **bootc-image-builder** is a tool that uses osbuild to create bootable container images that can be deployed using bootc. It provides a higher-level interface for building OSTree-based systems with container-native booting capabilities. ### How They Work Together @@ -91,6 +89,158 @@ bootc-image-builder build \ debian-ostree.json ``` +## 🔧 bootupd Integration and Bootloader Management + +### What is bootupd? + +**bootupd** is a modern bootloader management system designed for OSTree-based systems. It handles A/B partition updates for atomic upgrades and provides a unified interface for managing bootloader components across different architectures and platforms. + +### bootupd vs GRUB2 in particle-os + +particle-os currently implements **GRUB2** as the primary bootloader, but **bootupd** represents the future direction for modern OSTree systems: + +#### **Current Implementation: GRUB2** +- **Stage**: `org.osbuild.debian.grub2` +- **Purpose**: Traditional bootloader with UEFI support +- **Features**: Menu-based boot selection, kernel parameter management +- **Use case**: Traditional systems, compatibility, legacy support + +#### **Future Implementation: bootupd** +- **Purpose**: Modern bootloader management for OSTree systems +- **Features**: A/B partition updates, atomic bootloader upgrades +- **Use case**: Modern container-native systems, atomic updates + +### How bootupd Works with particle-os + +``` +OSTree System → bootupd → A/B Boot Partitions → Atomic Bootloader Updates + ↓ ↓ ↓ ↓ + System tree Bootloader Dual partitions Safe rollbacks + updates management (current/next) and upgrades +``` + +### bootupd Architecture in particle-os + +#### **Required Components** +1. **bootupd package** - Core bootloader management +2. **A/B partition layout** - Dual boot partitions for atomic updates +3. **EFI system partition** - UEFI bootloader storage +4. **OSTree integration** - System tree and bootloader coordination + +#### **Mount Points Required** +``` +/boot/efi - EFI system partition +/boot - Boot partition (kernel, initrd) +/ - Root filesystem (OSTree) +``` + +### bootupd Stage Implementation (Future) + +When implemented, the bootupd stage would look like: + +```json +{ + "name": "org.osbuild.debian.bootupd", + "options": { + "enable": true, + "efi_partition": "/dev/sda1", + "boot_partition": "/dev/sda2", + "config": { + "auto_update": true, + "rollback_enabled": true, + "a_b_partitions": true + } + } +} +``` + +### bootupd vs bootc Relationship + +#### **bootc (Container-native bootloader)** +- **Purpose**: Container-native OS management +- **Scope**: OS-level container operations +- **Integration**: Works with bootupd for bootloader management + +#### **bootupd (Bootloader management)** +- **Purpose**: Bootloader component management +- **Scope**: Boot partition and EFI management +- **Integration**: Provides bootloader services to bootc + +### Current particle-os Bootloader Strategy + +#### **Phase 1: GRUB2 Implementation (Current)** +- ✅ **Implemented**: Complete GRUB2 stage with UEFI support +- ✅ **Tested**: Thoroughly tested and validated +- ✅ **Production ready**: Stable and reliable for current deployments + +#### **Phase 2: bootupd Integration (Future)** +- 🔄 **Planned**: bootupd stage implementation +- 🔄 **Architecture**: A/B partition support +- 🔄 **Integration**: bootc + bootupd coordination + +### When to Use Each Bootloader + +#### **Use GRUB2 When:** +- Building traditional Debian systems +- Need legacy compatibility +- Require menu-based boot selection +- Working with existing infrastructure +- Need immediate production deployment + +#### **Use bootupd When:** +- Building modern OSTree systems +- Require atomic bootloader updates +- Need A/B partition support +- Working with container-native deployments +- Building future-proof systems + +### Migration Path + +#### **From GRUB2 to bootupd** +1. **Update manifest** to include bootupd stage +2. **Modify partition layout** for A/B support +3. **Update bootc configuration** for bootupd integration +4. **Test thoroughly** before production deployment + +#### **Hybrid Approach** +- **Keep GRUB2** for current systems +- **Add bootupd** for new deployments +- **Gradual migration** as systems are updated + +### bootupd in CI/CD Pipelines + +When bootupd is implemented, it will integrate seamlessly with existing CI/CD workflows: + +```yaml +# Future GitHub Actions with bootupd +- name: Build Debian OSTree with bootupd + run: | + osbuild examples/debian-bootupd-ostree.json + +- name: Test bootupd functionality + run: | + # Test A/B partition updates + # Verify atomic bootloader upgrades + # Validate rollback capabilities +``` + +### Future Roadmap + +#### **Short Term (Current)** +- ✅ GRUB2 implementation complete +- ✅ Traditional bootloader support +- ✅ Production-ready bootable images + +#### **Medium Term (Next Release)** +- 🔄 bootupd stage implementation +- 🔄 A/B partition support +- 🔄 Atomic bootloader updates + +#### **Long Term (Future)** +- 🔮 Full bootupd integration +- 🔮 Advanced A/B partition management +- 🔮 Seamless bootc + bootupd coordination + ## 🚀 Quick Start ### 1. Installation