Integrate systemd-sysupdate
One of the primary implementations needed to support A/B immutability is enabling systemd-sysupdate.
Steps:
- Separate /usr from the rest of the rootfs in its own partition (optional but makes this much easier)
- Build separate /usr partition images
- Create config for pulling these new images
- Figure out how to handle per-device configuration (eg required for booting)
Activity
changed milestone to %Immutable postmarketOS design and PoC
added immutability label
added systemd label
I have been in contact with the people over at Fedora working on bootc and I am beginning to think it would be a better immutability implementation than systemd-sysupdate. With bootc we wouldn't be locked into using systemd for immutability, along with solving the issue of device-specific configs with image layers, similar to what I was trying to do with systemd-sysext.
I know @caleb was against doing anything with container images, but I really do think this is the most feasible way to integrate immutability with our current stack. Otherwise we would pretty much be maintaining two different OS configurations with one being mutable and using traditional package management and the other being immutable, locked to systemd, and having to be updated in a different and (most likely) hacky way.