Bug 14949

Summary:	Solve systemd/usrmerge issues
Product:	[Build System, Metadata & Runtime] OE-Core	Reporter:	Ross Burton <ross.burton>
Component:	core	Assignee:	Ross Burton <ross.burton>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	Medium+	CC:	meta.mr.watcher, meta.watcher, randy.macleod
Version:	4.1
Target Milestone:	4.2 M2
Hardware:	x86
OS:	Multiple
Whiteboard:
OS type for building Yocto:	---	Type of Regression:	---
Verified:		Documentation change:	No (bug/feature does not impact docs)

Description Ross Burton 2022-10-25 15:57:16 UTC

A future systemd release will make non-/usr-merged systems incompatible with systemd:

https://lists.freedesktop.org/archives/systemd-devel/2022-September/048352.html

In theory, we can just make the systemd recipe require the usrmerge DISTRO_FEATURE and we're done.

However, there are reports that systemd+usrmerge don't actually pass our QA.

There's a hunch that this is just hardcoded paths in tests, but this hasn't been verified.  We should also be able to run oe-selftest in this environment.

Comment 1 Ross Burton 2022-10-25 17:02:34 UTC

So far, dnf.DnfRepoTest.test_dnf_installroot_usrmerge is failing. This is most likely a test case issue, not a fundamental problem with usrmerge.

Comment 2 Randy MacLeod 2022-10-28 15:00:55 UTC

For anyone looking for it, in the "Announcements of Future Feature Removals" section of the draft systemd-252 release notes:

* We intend to remove support for split-usr (/usr mounted separately
      during boot) and unmerged-usr (parallel directories /bin and
      /usr/bin, /lib and /usr/lib, etc). This will happen in the second
      half of 2023, in the first release that falls into that time window.
      For more details, see:
      https://lists.freedesktop.org/archives/systemd-devel/2022-September/048352.html


https://github.com/systemd/systemd/releases/tag/v252-rc3

Comment 3 Ross Burton 2022-10-28 15:13:32 UTC

So far in my testing the problems are 1) dnf (this was a bug in the test, it's just broken) and 2) overlayfs (probably a bad assumption in the test too).

Apart from that I think we're good to make systemd depend on usrmerge.

Comment 4 Ross Burton 2022-11-01 16:29:52 UTC

Patches sent to solve the dnf testimage failures.

Comment 5 Ross Burton 2023-01-18 16:33:04 UTC

Tests fixed in bb6ebb9956a42df3ed8681aec9aedf340b12f934.

I think this is done.