Bug#1095554: snapd: kernel features are missing: dbus, network (proper kernel dependency missing?)

[Ralf Bergs]

On 2025-02-09 11:55, Zygmunt Krynicki wrote:

Wiadomość napisana przez Ralf Bergs <ralf+deb...@bergs.biz> w dniu 9 lut 2025, 
o godz. 11:12:

It seems that snapd needs some kernel features that are not present in
the currently running kernel. However, if that is the case, then it
should depend on a kernel that *has* these features.

Those are kernel-level apparmor features that depend on the evolution of 
apparmor in the upstream kernel. Snapd can detect all such features and 
actively looks for several, mostly related to UNIX sockets that allow DBus 
message mediation. The process of landing those features in the upstream kernel 
has been long and complicated and is AFAIK still ongoing.

Snapd detects absence of those features and gracefully degrades functionality.

Thanks, Zygmunt, for elaborating and providing some background. That completely makes sense.

There is no way to depend on any kernel that would have all the features in 
Debian. At some point the upstream kernel release should have all of them so 
the messages will go away.

Would it not be possible to compile a kernel with all the required features enabled, give the package a name following a specific scheme (e.g. "linux-image-snap", you get the idea...), and then depend on or "recommend" such kernels?

Thanks again.

Or is it simply that the features may not even be available in a kernel that has been approved for "stable?"

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