Re: [PATCH v6 2/2] host/rootfs: Switch to systemd-udevd

[Alyssa Ross <hi@alyssa.is>]

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Alyssa Ross <hi@alyssa.is> writes:

> Demi Marie Obenour <demiobenour@gmail.com> writes:
>
>> On 11/8/25 14:49, Alyssa Ross wrote:
>>> Demi Marie Obenour <demiobenour@gmail.com> writes:
>>> 
>>>> @@ -113,14 +76,15 @@ let
>>>>  
>>>>    kernel = linux_latest;
>>>>  
>>>> -  appvm = callSpectrumPackage ../../img/app { inherit (foot) terminfo; };
>>>> -  netvm = callSpectrumPackage ../../vm/sys/net { inherit (foot) terminfo; };
>>>> +  appvm = callSpectrumPackage ../../img/app { inherit (no_pgo_foot) terminfo; };
>>>> +  netvm = callSpectrumPackage ../../vm/sys/net { inherit (no_pgo_foot) terminfo; };
>>>>  
>>>>    # Packages that should be fully linked into /usr,
>>>>    # (not just their bin/* files).
>>>>    usrPackages = [
>>>> -    appvm kernel.modules firmware netvm
>>>> -  ] ++ (with pkgsGui; [ mesa dejavu_fonts westonLite ]);
>>>> +    appvm kernel.modules firmware kmod kmod.lib
>>>> +    netvm mesa dejavu_fonts westonLite
>>>> +  ];
>>>>  
>>>>    appvms = {
>>>>      appvm-firefox = callSpectrumPackage ../../vm/app/firefox.nix {};
>>> 
>>> So based on what we'd discussed previously, I was ready to just apply
>>> this and pare down the Nix changes myself since I don't have to worry
>>> about rebuilds, etc., but in doing so I came across this.  Do you know
>>> why kmod.lib is required?  Is something impurely dlopening it?  Seems
>>> very strange, but I did verify that it's required for Weston to start.
>>
>> systemd uses dlopen heavily.  This allows dependencies to be optional
>> at runtime.  I remember strace showing that systemd-udevd dlopen's
>> kmod.lib.  In short, your diagnosis is correct.
>
> Okay, that's a packaging bug in Nixpkgs then.  (See e.g. [1].)  I'll see
> what can be done.
>
> [1]: https://github.com/NixOS/nixpkgs/commit/2328731ad041735a2260698574ce6599591f33ad

I have looked into it a bit and am now even more confused.  From what I
can see, loading libkmod should be done by libsystemd-shared.so, which
has kmod.lib in its RUNPATH.

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