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

[Demi Marie Obenour <demiobenour@gmail.com>]

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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.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)

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