media-video/wireplumber failed to start on my systemd gentoo install until I enabled dbus[user-session] which appears to be enabled for both the gnome and plasma desktop systemd profiles, which I am not using. Reproducible: Always Steps to Reproduce: 1. emerge media-video/pipewire-0.3.39-r4 on a systemd gentoo install. 2. Enable systemd user sessions as directed for pipewire and wireplumber (pulled in as dep) 3. Note the failing status for wireplumber. Actual Results: Oct 29 01:39:59 themisto systemd[1886]: Started PipeWire Multimedia Service. Oct 29 01:39:59 themisto systemd[1886]: Started Multimedia Service Session Manager. Oct 29 01:39:59 themisto pipewire[2458]: spa.dbus: Failed to connect to session bus: Unable to aut> Oct 29 01:39:59 themisto pipewire[2458]: mod.portal: Failed to connect to session bus: Input/outpu> Oct 29 01:39:59 themisto wireplumber[2459]: Error acquiring session bus address: Cannot autolaunch> Oct 29 01:39:59 themisto wireplumber[2459]: invalid unclassed pointer in cast to 'WpTransition' Oct 29 01:39:59 themisto wireplumber[2459]: wp_transition_return_error: assertion 'WP_IS_TRANSITIO> Oct 29 01:39:59 themisto wireplumber[2459]: disconnected from pipewire Oct 29 01:39:59 themisto systemd[1886]: wireplumber.service: Main process exited, code=exited, sta> Oct 29 01:39:59 themisto systemd[1886]: wireplumber.service: Failed with result 'exit-code'. Oct 29 01:39:59 themisto systemd[1886]: wireplumber.service: Scheduled restart job, restart counte> Oct 29 01:39:59 themisto systemd[1886]: Stopped Multimedia Service Session Manager. Expected Results: systemctl --user status wireplumber to show a running success status. Portage 3.0.20 (python 3.9.7-final-0, default/linux/amd64/17.1/no-multilib/systemd, gcc-11.2.0, glibc-2.33-r1, 5.10.61-gentoo-x86_64 x86_64) ================================================================= System uname: Linux-5.10.61-gentoo-x86_64-x86_64-Intel-R-_Core-TM-_i7-6500U_CPU_@_2.50GHz-with-glibc2.33 KiB Mem: 16310624 total, 12196972 free KiB Swap: 16777212 total, 16777212 free Timestamp of repository gentoo: Thu, 28 Oct 2021 08:00:01 +0000 Head commit of repository gentoo: 5ecb5ae9d7817b9fba9a5e2e5450653be25749b4 Timestamp of repository guru: Mon, 08 Nov 2021 13:21:22 +0000 Head commit of repository guru: 86bfe3f6f7ebde193c31a5783f167afd00c15bbd Head commit of repository kubler: e3547c6a6898ca7308c94e14678c96938dea7751 Timestamp of repository nix-guix: Fri, 05 Nov 2021 19:36:28 +0000 Head commit of repository nix-guix: 97d71cf02bed5d770cc19705b4b63612d801f0aa Timestamp of repository pentoo: Tue, 09 Nov 2021 00:51:24 +0000 Head commit of repository pentoo: 701b495acfbf94ad642ad6972ec6adeaaa91d0ad Timestamp of repository ricerlay: Fri, 05 Nov 2021 19:36:28 +0000 Head commit of repository ricerlay: 4e487438ae0086466fb886e5d1596c0f73280ae3 sh bash 5.1_p8 ld GNU ld (Gentoo 2.37_p1 p0) 2.37 app-shells/bash: 5.1_p8::gentoo dev-lang/perl: 5.34.0-r3::gentoo dev-lang/python: 3.9.7_p1::gentoo dev-lang/rust-bin: 1.53.0::gentoo dev-util/cmake: 3.20.5::gentoo sys-apps/baselayout: 2.7::gentoo sys-apps/sandbox: 2.25::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.71-r1::gentoo sys-devel/automake: 1.16.4::gentoo sys-devel/binutils: 2.37_p1::gentoo sys-devel/gcc: 11.2.0::gentoo sys-devel/gcc-config: 2.4::gentoo sys-devel/libtool: 2.4.6-r6::gentoo sys-devel/make: 4.3::gentoo sys-kernel/linux-headers: 5.10::gentoo (virtual/os-headers) sys-libs/glibc: 2.33-r1::gentoo Repositories: gentoo location: /var/db/repos/gentoo sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 sync-rsync-extra-opts: sync-rsync-verify-metamanifest: yes sync-rsync-verify-jobs: 1 sync-rsync-verify-max-age: 24 guru location: /var/db/repos/guru sync-type: git sync-uri: https://github.com/gentoo-mirror/guru.git masters: gentoo kubler location: /var/db/repos/kubler sync-type: git sync-uri: https://github.com/edannenberg/kubler-overlay.git masters: gentoo local location: /var/db/repos/local masters: gentoo nix-guix location: /var/db/repos/nix-guix sync-type: git sync-uri: https://github.com/gentoo-mirror/nix-guix.git masters: gentoo pentoo location: /var/db/repos/pentoo sync-type: git sync-uri: https://github.com/gentoo-mirror/pentoo.git masters: gentoo ricerlay location: /var/db/repos/ricerlay sync-type: git sync-uri: https://github.com/gentoo-mirror/ricerlay.git masters: gentoo cross-aarch64-unknown-linux-gnu location: /var/db/repos/cross-aarch64-unknown-linux-gnu masters: gentoo priority: 10 cross-arm-none-eabi location: /var/db/repos/cross-arm-none-eabi masters: gentoo priority: 10 ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="@FREE" 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Thank you for you report. I have been wondering about that for a while now (in theoretical capacity - this is the first such report). ;) My understanding is that dbus[user-session] ensures there's a dbus --session instance associated with every logged on user via hooks inside PAM. This in turn means that one can then start D-Bus user session dependent things without a worry. People who do not have dbus[user-session] enabled _must_ ensure it is started before they can use software relying on it. This typically means wrapping your graphical environment startup script in dbus-run-session like so: dbus-run-session startplasma-wayland # untested but seems like it should work Alternatively Gentoo Wiki suggests using: if which dbus-launch >/dev/null && test -z "$DBUS_SESSION_BUS_ADDRESS"; then eval `dbus-launch --sh-syntax --exit-with-session` fi inside a launcher script before running anything D-Bus related. As such, I think, this is not something for PipeWire/WirePlumber to fix, since it involves both operator error (not reading documentation) and bad integration between lower level OS components. Package maintainers for dbus and/or systemd may want to consider either replacing dbus[user-session] with dbus[systemd] or at least make dbus[user-session] a dependency of systemd since this is an issue that will affect other user units, too.
I have the following lines in my .zlogin file: [[ $(tty) == /dev/tty1 && ! $WAYLAND_DISPLAY ]] && exec dbus-run-session sway Maybe if dbus[-user-session] then the dbus-launch command should be used instead, I'm not sure.
It appears that I may have misunderstood that dbus[user-session] was a mere convenience when it may be a core requirement for at least some systemctl --user use cases. I'm still a bit surprised that even manually launching dbus user session via a wrapper doesn't help, since then I have no knowledge or understanding of how it could possibly be working with OpenRC (which is known to work). Perhaps linking with libsystemd changes the expected D-Bus user session directory from /tmp to /run/user/$UID/bus? I'll keep this bug open for now but the issue will be resolved in dbus ebuild by renaming user-session to systemd IUSE. Thanks to Mike for digging into this and then filing a PR that involves many important desktop projects.
(In reply to Niklāvs Koļesņikovs from comment #3) > It appears that I may have misunderstood that dbus[user-session] was a mere > convenience when it may be a core requirement for at least some systemctl > --user use cases. I'm still a bit surprised that even manually launching > dbus user session via a wrapper doesn't help, since then I have no knowledge > or understanding of how it could possibly be working with OpenRC (which is > known to work). Perhaps linking with libsystemd changes the expected D-Bus > user session directory from /tmp to /run/user/$UID/bus? > > I'll keep this bug open for now but the issue will be resolved in dbus > ebuild by renaming user-session to systemd IUSE. Thanks to Mike for digging > into this and then filing a PR that involves many important desktop projects. Maybe the environment variables from dbus-run-session / dbus-launch are not passed to systemd user sessions? I don't have a deep understanding of these components, but the man-pages mention some DBUS_XXX variables that get set, I could image these are not passed to the systemd user sessions under some circumstances.
Indeed, if systemd --user is started via a hook in PAM, then by the time the user shell is started after successful authorization, systemd --user is already running and its environment will not be changed by what the user then does in their shell. This does not affect OpenRC since there's no user daemon manager which would be started that early on. Therefore gentoo-pipewire-launcher can be executed in user's shell environment after dbus-run-session and inherit the environment set by it.
