Utilities to add support for maintaining multiple boot environments for Linux root installations on ZFS. Intended to work with environments based on following this guide modified to split /boot/grub into a separate dataset shared across boot environments and identifying boot environments as datasets with zfs properties mountpoint=/ and canmount=noauto.

This project is primarily an effort to satisfy a personal need (See Issue 5809) in absence of a mature beadm-like toolset for Ubuntu's current LTS release.

Warning: this is an experimental project with currently no participation by experienced members of the ZOL project, package maintainers, or distribution developers. Use at your own risk.

At present the primary utility provided is a grub-mkconfig helper script 15_linux_zfs, built to run alongside/after and eventually replace /etc/grub.d/10_linux. In its current state, the script only supports zfs roots with some menu entry details still hard-coded to my specific local environment and configuration.

Use the included test.sh script to non-destructively determine whether your configuration is supported. EFI booting is theoretically supported but untested. Due to the limited range of test environments and unstable state, even when installed the script will not replace stock grub scripts the entries they generate. Boot-environment-specific entries will appear after the stock entries.

Lightweight partial implementation of beadm that can list, create, destroy, and activate boot environments. (Activation requires GRUB_DEFAULT=saved in /etc/default/grub.)

Supported options:

• beadm list
• beadm create [-a] [-e bename@snapname] bename
• beadm destroy bename
• beadm activate bename

Creating boot environments across pools is not supported, nor even is creating a boot environment in a location separate from the origin dataset. However, manually created boot environments in separate datasets will be correctly understood so long as no collissions occur on dataset name.