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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-765bb916bd7sm6355657b3.11.2025.09.25.10.53.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Sep 2025 10:53:12 -0700 (PDT) Message-ID: <5e6bd5d5-a6b3-43f4-8cfd-dc68b432d2ea@gmail.com> Date: Thu, 25 Sep 2025 13:53:08 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/3] host/rootfs: Switch to systemd-udevd To: Alyssa Ross References: <20250924-udev-v2-0-6089de521b3b@gmail.com> <20250924-udev-v2-2-6089de521b3b@gmail.com> <87zfaiby79.fsf@alyssa.is> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <87zfaiby79.fsf@alyssa.is> Content-Type: multipart/signed; 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boundary="------------xhqPLbHR1bU8V5ezVGtQKK0F"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development Message-ID: <5e6bd5d5-a6b3-43f4-8cfd-dc68b432d2ea@gmail.com> Subject: Re: [PATCH v2 2/3] host/rootfs: Switch to systemd-udevd References: <20250924-udev-v2-0-6089de521b3b@gmail.com> <20250924-udev-v2-2-6089de521b3b@gmail.com> <87zfaiby79.fsf@alyssa.is> In-Reply-To: <87zfaiby79.fsf@alyssa.is> Autocrypt-Gossip: addr=hi@alyssa.is; keydata= xsFNBFpSgoYBEAC4xkCYidG2JlRWulUkTWcx0pHFDf3oSbb6Q872Kb3iDChWgluNVz43hva1 3xfDo9foV0GoyfGl/ycSCkXX5hlQr7ir/5FN38E7H/yY6tH8+l68iDgIOcb1qY0OYaxyg+Lz WesfFQedrmwNTbF4L1BtWzrTR5PflDdhDo5VWSguHGJFSclchcr/6UmMb/gOUN+2ElBC2TE2 EKY099phZ6DJZ2aZCsclwKIdCpZzXlEmXPAeaH5om6xo90JYv5+sFji40R0Plqec3WC+jTxy lGca6IbPdOminuUF+GvsR86eVsgh/0XNK7/zus7gyc4PuMUA1rCoeHcWOBDPgmelgCQyJGXd /bXeKuUsGoge58uc7/YNvOh1vfpD3AaEMqAyXfmmUwBnIicml74+2eOpH3Oljfs01g+DhkOB MtpVSZSgaIDvP0WG6cbAxImoUasnmNxEDNskfVmI8bsajPW9bt4z5hiP5Q9G3vE0D5HcIFdM adOz81PpOwNiUXcjtYV1PWZQ56jbSTOf8EBvsB71WwB+XgVWcPzIlY8hAykiHIO87oV3o71U JTAn1Foj7mjSADnY0deleOmar/K5jrK3wvKKM1XlB7PXcGBdkorJC+cbxVsw0ADzMw0c7bVc wEE7OFvHjQiIK1lO+lb1cvGBBY3IZxjsjZdA/VsFHFdAeYlzNQARAQABzRpBbHlzc2EgUm9z cyA8aGlAYWx5c3NhLmlzPsLBlwQTAQgAQQIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAIZ ARYhBHVzVtd5u7iIdz5BXnNszfnvUb2XBQJoh9HmBQkOtoJgAAoJEHNszfnvUb2XFxAP/jF7 Rxuspytz7VwOA/y5WQe/FdPNRvyRUzj66ZzfuaG++md14LWcrvbb2hHLdS5ePdKoOaqC3xhK Ncy/5RVd4pD5N4AY7O5228JKDO8GGWEl3rupOCmYQL9P8GpsdGt2xkFqbu4HrFzMTzl6nvKN GtvhBSCkAW3v7wTwPf2rkjX8f+clmRZn4YLfojaBCT/ZFjmJkQSWZ+2rUZOxjgZgckLkplu8 LVILVdaHNLkOrxbKQLuuVyEkN+/YrshyJP4a7Z/Tnw+3eZcaLuLOxBHpWOAAgJZ8kL+V7BxK DlTywv/OOr0CoNi9zjH3VgRiJ1961K/DocjA50pWBilMUs4jGp9omhkAOwdNV2hi+Zj/GXaD kgvBlE313DGWzgW0RauL8j5/GULgphwm5UOHXb/5yM9pRw87kfQ/+zQuHpguoXSGkUv0kSID 88kUGlNxy1kkTsSYG2UTKLmLDPuUGOUDGaNUzD+J49MogSLTmvHUIYNs0jFmpLyhVoTtSi/I VQQpHyk9ucAZd2OLxChm3RBJhAbmGw3rhUxx6B8SHwcBcJDttGyYF2GZj9AYAGlU/Fm1Itoi NwJD0vQnSZ//25l+XJehpeeixsqydj00gksHWEFaIEgCYyC6JfmGS4HtuUcv76vc2vLCv5aH hJVHHKGs+kiKJ2+r7bCNwvW0doVePdByzjgEZyd/yxIKKwYBBAGXVQEFAQEHQCVxoiHOlsEo NDKGCbxg4nL3E1CV0MRQCU1hPowd77h3AwEIB8LBfAQYAQoAJgIbDBYhBHVzVtd5u7iIdz5B XnNszfnvUb2XBQJoh9HXBQkB4YUCAAoJEHNszfnvUb2XgvAP+gIIKR3KatmwuUcla1RN6tUc 0Ae9eqS1cbSEDj8a14fnvUHtlCEO5g4m2PvPn7L2o7047ppl5100+zGMocXWslnDFJJVeAOp xzlhZ48DFMxkZkjtLY2fRrj1tOtzrTRikV0/UsaVs9tMPMEsVu/FH0exMoNELcqEVUgcRRpd XYXC9zgDUcM4+JRH8hDOiC51JRvdkXcokAXphuCY3J996i8Ph+kg6xMqscePscvvltR68jcT HHDOiOQtzjJRKQ6BHUzYdIRixcq210sabfZGJVT+7BfHI5qiUwfoG3DXSJygviN3I/EfnSbD 6T0Ccv/G6wQPHO4Vyn+egrMOU/HUrCKuq/b0rYvI8pTtRWAxIHkFZoKVB8I8Rl8+riGiEUAh Ja0bU4iOg7vR5Bm8Gt/tR6KjClyBI5NN1M1haFgVXqZ3dsQDpBjivbDHbUsAXVsd00y0B4Ir 8muvII9eJOwbTyqcG9RJbflquPp+FPlgiy9pYj52PB0NwzLYqX0fOWU8IqQF3bWtdJIb4Zat XnfqYtJ/wCaJTU43N3+/TIdqNA4G3WbyRYsCnz/kkf1ARmxoq3r29dOl8OnNHEvB1+hBlNBk d+cLpsYdTxa63OpbNDpm/unX1sEpOYy04dL5Y8B1Xbh+rQFNySq4Ani2dl5N1OsrjgzZ+wkl k2wOTWzl7wFH --------------xhqPLbHR1bU8V5ezVGtQKK0F Content-Type: multipart/mixed; boundary="------------0caijGIgNXzz7lysP4tDLgR1" --------------0caijGIgNXzz7lysP4tDLgR1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 9/25/25 06:53, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> This replaces the mdevd uevent daemon with systemd-udevd, which suppor= ts >> 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. >> >> The dependency on /dev/dri/card0 being present is eliminated, and >> whatever devices the user has are now picked up by the compositor. Ne= w >> dependencies are added to ensure that udev coldplug has finished befor= e >> any non-trivial services are started. systemd-udev-trigger.service ru= ns >> 'udevadm trigger' and has Before=3Dsysinit.target, so anything that is= not >> an early boot service can assume 'udevadm trigger' has run. >> >> systemd-udevd doesn't set PATH to anything useful, presumably because >> under NixOS this is handled some other way. Therefore, explicitly set= >> it to /usr/bin in the scripts systemd-udevd calls. >> >> The /etc/mdev/listen and /etc/mdev/wait scripts are replaced by >> 'udevadm wait', so they are deleted. The whole static-nodes target al= so >> goes away, as Linux handles that itself and systemd-udevd deals with >> autoloading. >=20 > Not quite right. Linux does not create static nodes. Userspace has to= =2E > That's why we had a service for it. (It sucks.) >=20 >> diff --git a/host/rootfs/image/etc/s6-rc/kvm/up b/host/rootfs/image/et= c/s6-rc/kvm/up >> index c02e3f90245e005b98b4de8245a1863fb49c1158..a8436de58580f2a2a6f42b= b69418a319f967df47 100644 >> --- a/host/rootfs/image/etc/s6-rc/kvm/up >> +++ b/host/rootfs/image/etc/s6-rc/kvm/up >> @@ -1,4 +1,3 @@ >> # SPDX-License-Identifier: EUPL-1.2+ >> -# SPDX-FileCopyrightText: 2023 Alyssa Ross >> - >> -/etc/mdev/wait kvm >> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour >> +udevadm wait /dev/kvm >=20 > Any reason now not to just inline this into the services that need to w= ait? Avoiding redundant calls I guess? I'm not sure how expensive 'udevadm wait' is. >> diff --git a/host/rootfs/image/etc/s6-rc/systemd-udevd/run b/host/root= fs/image/etc/s6-rc/systemd-udevd/run >> new file mode 100644 >> index 0000000000000000000000000000000000000000..2501680b69eb0060b65114= 6dffb6b3a99640c6fb >> --- /dev/null >> +++ b/host/rootfs/image/etc/s6-rc/systemd-udevd/run >> @@ -0,0 +1,11 @@ >> +#!/bin/execlineb -P >> +# SPDX-License-Identifier: EUPL-1.2+ >> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour >> +if { rm -f /run/sd-notify-wrapper/systemd-udevd } >> +background { >> + s6-ipcserver-socketbinder -b0 -m -a 0600 /run/sd-notify-wrapper/sy= stemd-udevd >> + fdmove 1 3 >> + sd-notify-adapter >> +} >> +export NOTIFY_SOCKET /run/sd-notify-wrapper/systemd-udevd >> +exec -a systemd-udevd udevadm >=20 > How does systemd expect this to normally work? /usr/lib/systemd/systemd-udevd is a symlink to ../../bin/udevadm >> diff --git a/host/rootfs/image/etc/s6-rc/vm-env/contents b/host/rootfs= /image/etc/s6-rc/vm-env/contents >> index 580795b1b02bb7a8dff7f872723c678141d4bb70..ed8b5c410adfc17f5bbc33= 932ac79d97bd7b3115 100644 >> --- a/host/rootfs/image/etc/s6-rc/vm-env/contents >> +++ b/host/rootfs/image/etc/s6-rc/vm-env/contents >> @@ -2,4 +2,5 @@ >> # SPDX-FileCopyrightText: 2021 Alyssa Ross >> # >> static-nodes >> +systemd-udevd-coldplug >> weston >=20 > Shouldn't static-nodes be removed here as well, and the static-nodes > files deleted? Nope. systemd-udevd doesn't create them. However, one can use kmod and systemd-tmpfiles to do that. systemd-tmpfiles actually has no dependency on PID 1 *at all*, so we can use it as much as we want. >> diff --git a/host/rootfs/image/etc/udev/rules.d/99-spectrum.rules b/ho= st/rootfs/image/etc/udev/rules.d/99-spectrum.rules >> new file mode 100644 >> index 0000000000000000000000000000000000000000..ca91367529f39eebe009cc= 8acef782cf6a4516c1 >> --- /dev/null >> +++ b/host/rootfs/image/etc/udev/rules.d/99-spectrum.rules >> @@ -0,0 +1,9 @@ >> +# SPDX-License-Identifier: EUPL-1.2+ >> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour >> + >> +# systemd-udevd has a built-in module loading feature, >> +# but it seems to not work for some reason or another. >> +# This works. >> +ACTION!=3D"remove", ENV{MODALIAS}!=3D"", RUN+=3D"/usr/bin/modprobe -q= $env{MODALIAS}" >> +# systemd-udevd unsets PATH, so fix that. >> +ACTION!=3D"remove", ENV{PCI_CLASS}=3D=3D"2????", RUN+=3D"/usr/bin/env= PATH=3D/usr/bin /usr/libexec/net-add" >=20 > This is such a weird behavior. Do we know why it does that? I don't at least. >> diff --git a/host/rootfs/image/usr/bin/vm-start b/host/rootfs/image/us= r/bin/vm-start >> index 67480e5215d8a8260ce3f03c67f71ba8f210c291..9725ef5ec549ff19160628= 2a7b0ae56838f53f03 100755 >> --- a/host/rootfs/image/usr/bin/vm-start >> +++ b/host/rootfs/image/usr/bin/vm-start >> @@ -2,7 +2,7 @@ >> # SPDX-License-Identifier: EUPL-1.2+ >> # SPDX-FileCopyrightText: 2022-2023, 2025 Alyssa Ross >> =20 >> -foreground { s6-rc -bu change vm-env } >> +foreground { s6-rc -bu change weston } >> =20 >> foreground { >> redirfd -w 2 /dev/null >=20 > Why? 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