UbuntuDevel/EarlyUserspace

Status

• Created: Date(2005-04-24T00:19:19Z) by MattZimmermanBR

• Priority: LowPriorityBR

• People: NeedsLead, NeedsSecondBR

• Contributors: JaneSilberBR

• Interested: JeffBailey BR

• Status: UduBof, DistroSpecificationBR

• Branch: BR

• Malone Bug: BR

• Packages: BR

• Depends: BR

• UduSessions: 1BR

Introduction

Develop a plan for a new early userspace system for Breezy which will increase robustness and allow for more flexible deployment of Ubuntu. Discussion must cover:

• Transition plan for initrd->initramfs

• hotplug or hotplug-ng?
• Finding the root filesystem
  • Generating a unique id?
  • Mounting by label/uuid
• Falling back to existing behaviour
  • Precalculating boot device and driver requirements
• Debuggability
  • More verbose output in recovery mode
  • Do something smarter than panic if things go wrong. Dump debug info?
  • Availability of command-line recovery tools

Rationale

Scope and Use Cases

• Perform sufficient hardware detection in early userspace to support root filesystems on disk, USB or network
• Transparently locate and mount the proper root filesystem, even if it is found on a different logical device than at the time of kernel configuration
• Be easier to debug than existing early userspace
• Fall back gracefully to precalculated process (a la mkinitrd) with a warning if the process fails. Keep breakage to a minimum; booting is important!

Implementation Plan

Data Preservation and Migration

Packages Affected

User Interface Requirements

Outstanding Issues

UDU BOF Agenda

UDU Pre-Work