On 10/1/25 10:39, Alyssa Ross wrote:
> Demi Marie Obenour <demiobenour@gmail.com> writes:
> 
>> This replaces the mdevd uevent daemon with systemd-udevd, which supports
>> much more hardware and is therefore to be preferred for a full desktop
>> environment.  Various Wayland compositors integrate with systemd-udevd,
>> allowing them to discover devices as they appear rather than having to
>> only use devices plugged in when the compositor is started.
>> Additionally, systemd-udevd has quirks for various devices that are
>> needed to support the wide variety of hardware end-users have.
> 
> Just want to note that this implementation currently doesn't, because it
> doesn't install the hardware database.  (I noticed this while debugging
> the modprobe thing.)

Nice catch.  Thank you!

> I was able to get it to work with the following diff.  I don't think it
> needs to be in this commit, so I'll just add this separately once we
> have the basic udev implementation in, but I'm posting it here now so we
> don't end up duplicating work. :)
> 
> diff --git a/host/rootfs/default.nix b/host/rootfs/default.nix
> index 8abe108..b8e72f2 100644
> --- a/host/rootfs/default.nix
> +++ b/host/rootfs/default.nix
> @@ -84,6 +84,15 @@ let
>    usrPackages = [
>      appvm kernel.modules firmware kmod kmod.lib
>      netvm mesa dejavu_fonts westonLite
> +
> +    (runCommand "hwdb.bin" {
> +      nativeBuildInputs = [ systemd ];
> +    } ''
> +      mkdir -p $out/lib/systemd/hwdb etc/udev
> +      cp -R ${systemd}/lib/udev/hwdb.d etc/udev
> +      systemd-hwdb update -sr .
> +      mv etc/udev/hwdb.bin $out/lib/systemd/hwdb
> +    '')
>    ];
>  
>    appvms = {

Could this just be a symlink?
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)