Re: D-Bus service files on foreign distributions

[Roman Riabenko]

У пн, 2024-08-26 у 10:27 +0200, Nils Landt пише:
> > Roman Riabenko via <help-guix@gnu.org> hat am 25.08.2024 13:08 CEST
> > geschrieben:
> > 
> > How to expose service files to D-Bus on a foreign distribution?
> 
> I'm 100% guessing here, but I think systemd just doesn't see your
> service files because they are not in the search path.
> If this is the case, you can set XDG_DATA_DIRS in
> ~/.config/systemd/user.conf (under the Manager header), i.e.:
> [Manager]
> ManagerEnvironment="XDG_DATA_DIRS=/home/purism/.guix-profile/share"

Thank you for the suggestion. The lines are already present. I assume
that the guix installation script added them.

$ cat ~/.config/systemd/user.conf
[Manager]
ManagerEnvironment="XDG_DATA_DIRS=/home/purism/.guix-profile/share"

It may be working because the systemd environment for the user session
gets the value.

$ systemctl --user show-environment | grep XDG_DATA_DIRS
XDG_DATA_DIRS=/home/purism/.guix-profile/share:/home/purism/.guix-
profile/share:/usr/share/librem5:/home/purism/.guix-
profile/share:/home/purism/.guix-
profile/share:/usr/share/librem5:/home/purism/.local/share/flatpak/expo
rts/share:/var/lib/flatpak/exports/share:/usr/local/share/:/usr/share/

But systemd does not pass the value to the user DBus environment.

$ systemctl --user status dbus | grep PID
   Main PID: 1261 (dbus-daemon)
$ sudo strings /proc/1261/environ | grep XDG_DATA_DIRS
XDG_DATA_DIRS=/home/purism/.local/share/flatpak/exports/share:/var/lib/
flatpak/exports/share:/usr/local/share/:/usr/share/

So, DBus does not see the service files in the guix profile.

$ LC_ALL=C gdbus call --session --method
org.freedesktop.DBus.Introspectable.Introspect --dest
org.gnome.TextEditor --object-path=/org/gnome/TextEditor
Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.gnome.TextEditor was not provided by any .service files

The manual page for systemd-system.conf says that to set manager
environment variables passed to all executed process, one can set
DefaultEnvironment option. I set it as suggested in
https://unix.stackexchange.com/a/698459/423679

$ cat ~/.config/systemd/user.conf
[Manager]
ManagerEnvironment="XDG_DATA_DIRS=/home/purism/.guix-profile/share"
DefaultEnvironment="XDG_DATA_DIRS=/home/purism/.guix-profile/share"

This change was ignored. So, I tried adding it to the file specified in
the manual page.

$ cat /etc/systemd/user.conf | grep DefaultEnvironment
DefaultEnvironment="XDG_DATA_DIRS=%h/.guix-profile/share"

But I could not login with that. I do not know how to investigate it
further. Any suggestions are appreciated. However, it appears that the
problem comes entirely from how DBus environment was configured in the
host distribution. So, I will proceed looking for help there.

Roman

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