Bug 16109

Summary:	do_rootfs step fails with read-only rootfs and systemd-compat-units package
Product:	[Build System, Metadata & Runtime] OE-Core	Reporter:	Zach Kozar <Zachary.Kozar>
Component:	core	Assignee:	Ross Burton <ross.burton>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	Medium	CC:	ccasciato, meta.mr.watcher, meta.watcher, randy.macleod, yoann.congal
Version:	5.99
Target Milestone:	6.0
Hardware:	x86
OS:	x86_64
Whiteboard:
OS type for building Yocto:	---	Type of Regression:	---
Verified:		Documentation change:	No (bug/feature does not impact docs)

Description Zach Kozar 2025-12-19 20:01:09 UTC

After upgrading one of my projects from scarthgap to walnascar, I am getting this error when bitbaking my image that uses the read-only-rootfs option:

core-image-vins-1.0-r0 do_rootfs: The following packages could not be configured offline and rootfs is read-only: ['100-systemd-compat-units']


It appears to be caused by this commit: https://github.com/openembedded/openembedded-core/commit/e88f22da19a7f3f9bf23f2a607ffde6b5b1a3265. The post-install script cannot be run because it was changed to run on the target, but this makes the systemd-compat-units recipe incompatible with the read-only rootfs option. I was able to fix this on my build by reverting the change in that commit.

Comment 1 Randy MacLeod 2026-01-08 15:37:42 UTC

Ross to reply. Reverting just leaves the race condition so that's not sufficient.

Next to fix in master and scarthgap, etc.

Comment 2 Ross Burton 2026-01-13 16:42:27 UTC

Reverting that commit will just reintroduce a race condition, so that isn't really a solution because you're swapping a problem for another problem.

Looking at the recipe, none of that logic needs to happen on target. I shall send a patch to rewrite chunks of the recipe.

Comment 3 Ross Burton 2026-01-13 18:48:05 UTC

I have a patch to change how that recipe works, can you test it please?

https://lore.kernel.org/openembedded-core/20260113184632.3953060-1-ross.burton@arm.com/T/#u

Also, are you aware that this package is only needed if you're building images with _both_ systemd and syvinit? That's not the best idea, and I recommend picking one.

Comment 4 Zach Kozar 2026-01-14 21:39:05 UTC

Thanks. I applied your patch and am able to build with both systemd-compat-units and read-only-rootfs. 

And no, I did not know that. I am not using sysvinit, and it is not in my distro features. It looks like my BSP is adding sysvinit into systemd's packageconfig: https://github.com/nxp-imx/meta-imx/blob/walnascar-6.12.34-2.1.0/meta-imx-bsp/recipes-core/systemd/systemd_%25.bbappend. However they are not adding it to the distro features. I added my own systemd bbappend to remove it from the config, and can confirm it no longer pulls in systemd-compat-units. Sorry if this is off topic.

Comment 5 Ross Burton 2026-05-21 15:03:10 UTC

Merged in 4dc01e016210acd15f153b25e609dce5eee9e0bb.