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Sat, 8 Nov 2025 17:37:02 -0500 (EST) Received: by mbp.qyliss.net (Postfix, from userid 1000) id A92FB68FD611; Sat, 08 Nov 2025 23:37:01 +0100 (CET) From: Alyssa Ross To: Demi Marie Obenour Subject: Re: [PATCH v6 2/2] host/rootfs: Switch to systemd-udevd In-Reply-To: References: <20251107-udev-v6-0-176246281424@gmail.com> <20251107-udev-v6-2-176246281424@gmail.com> <87seeonw3a.fsf@alyssa.is> <87ecq8tddi.fsf@alyssa.is> <87bjlctbml.fsf@alyssa.is> Date: Sat, 08 Nov 2025 23:37:00 +0100 Message-ID: <878qggtalv.fsf@alyssa.is> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Message-ID-Hash: XI5PRINI4S2L5PGURBLLKZD43AGM5SYL X-Message-ID-Hash: XI5PRINI4S2L5PGURBLLKZD43AGM5SYL X-MailFrom: hi@alyssa.is X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Spectrum OS Development X-Mailman-Version: 3.3.9 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Demi Marie Obenour writes: > On 11/8/25 17:14, Alyssa Ross wrote: >> Alyssa Ross writes: >>=20 >>> Demi Marie Obenour writes: >>> >>>> On 11/8/25 14:49, Alyssa Ross wrote: >>>>> Demi Marie Obenour writes: >>>>> >>>>>> @@ -113,14 +76,15 @@ let >>>>>>=20=20 >>>>>> kernel =3D linux_latest; >>>>>>=20=20 >>>>>> - appvm =3D callSpectrumPackage ../../img/app { inherit (foot) term= info; }; >>>>>> - netvm =3D callSpectrumPackage ../../vm/sys/net { inherit (foot) t= erminfo; }; >>>>>> + appvm =3D callSpectrumPackage ../../img/app { inherit (no_pgo_foo= t) terminfo; }; >>>>>> + netvm =3D callSpectrumPackage ../../vm/sys/net { inherit (no_pgo_= foot) terminfo; }; >>>>>>=20=20 >>>>>> # Packages that should be fully linked into /usr, >>>>>> # (not just their bin/* files). >>>>>> usrPackages =3D [ >>>>>> - appvm kernel.modules firmware netvm >>>>>> - ] ++ (with pkgsGui; [ mesa dejavu_fonts westonLite ]); >>>>>> + appvm kernel.modules firmware kmod kmod.lib >>>>>> + netvm mesa dejavu_fonts westonLite >>>>>> + ]; >>>>>>=20=20 >>>>>> appvms =3D { >>>>>> appvm-firefox =3D 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/2328731ad041735a2260698574= ce6599591f33ad >>=20 >> 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. > > According to https://wiki.debian.org/RpathIssue, only the RUNPATH of > the executable is honored. The RUNPATH of libraries is not honored. > For this to work, libsystemd-shared.so needs to have kmod.lib in its > RPATH, and udevadm *may* need to not have a RUNPATH. Right, so we might need to add --force-rpath to the patchelf invocation. I wonder why this doesn't affect every NixOS system, though. They certainly don't have /usr/lib/libkmod.so.2. --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEARYKAB0WIQRV/neXydHjZma5XLJbRZGEIw/wogUCaQ/GDAAKCRBbRZGEIw/w oqlrAP9lWdBwwIBTi3zAV7giKCKNFs43JnrEwMu79jtFSvLaXwD9H9D/nFLaWHKH qazNx89DCyh4yvqwXEWDFXDsh2+/dgg= =iyF2 -----END PGP SIGNATURE----- --=-=-=--