Warning message "D-Bus socket address not found", even if command itself works

[pvx-]

Related to #107 - I was affected by the problem there and blacklisted all 2.x versions as result; now I tested 2.2.1 (latest at this time) and it works OK, it just shows "D-Bus socket address not found, unable to list player names" warning every time (every single command I tested works and displays this message).

Not a big problem :), but hopefully can be fixed easily. Small shell-example (playerctl-0.6.1 is version 0.6.1 binary I was using until today):

$ playerctl -l

(playerctl:4290): playerctl-WARNING **: 11:34:11.230: D-Bus socket address not found, unable to list player names
mpv
$ playerctl status

(playerctl:4318): playerctl-WARNING **: 11:34:24.473: D-Bus socket address not found, unable to list player names
Paused
$ playerctl-0.6.1 -l
Could not connect: No such file or directory
$ playerctl-0.6.1 status
Paused
$ dbus-send --session --dest=org.freedesktop.DBus --type=method_call --print-reply /org/freedesktop/DBus org.freedesktop.DBus.ListNames
method return time=1596965682.488785 sender=org.freedesktop.DBus -> destination=:1.41834 serial=3 reply_serial=2
   array [
      string "org.freedesktop.DBus"
      string ":1.41834"
      string "org.mpris.MediaPlayer2.mpv"
      string ":1.41829"
   ]

If you need any other info, just let me know (including code modification and recompile).

[acrisci]

It's probably for the system bus address. You might have an env I'm not anticipating. Maybe the warning is too much.

Set G_MESSAGES_DEBUG=playerctl to get a log and it might give me more info.

[pvx-]

There doesn't seem to be much, but maybe you'll see something I do not :) (btw. the blank line before warning is there every time, I didn't add that):

$ G_MESSAGES_DEBUG=playerctl playerctl -l
(process:13724): playerctl-DEBUG: 23:20:33.361: playerctl version 2.2.1
(playerctl:13724): playerctl-DEBUG: 23:20:33.364: Getting list of player names from D-Bus

(playerctl:13724): playerctl-WARNING **: 23:20:33.364: D-Bus socket address not found, unable to list player names
mpv
$ G_MESSAGES_DEBUG=playerctl playerctl status
(process:13740): playerctl-DEBUG: 23:20:45.153: playerctl version 2.2.1
(playerctl:13740): playerctl-DEBUG: 23:20:45.157: Getting list of player names from D-Bus

(playerctl:13740): playerctl-WARNING **: 23:20:45.157: D-Bus socket address not found, unable to list player names
(playerctl:13740): playerctl-DEBUG: 23:20:45.157: found player: mpv
(playerctl:13740): playerctl-DEBUG: 23:20:45.158: initializing player: mpv
(playerctl:13740): playerctl-DEBUG: 23:20:45.158: executing command status
Paused

[acrisci]

The error indicates you either have an env variable called DBUS_SYSTEM_BUS_ADDRESS set to a nonexistent path or the default path does not exist. Try stat /var/run/dbus/system_bus_address. I've never seen someone with a session bus without a system bus so this is a weird situation.

Since neither bus type should actually be required, I think I'll change this to a debug message and maybe only fail if it doesn't connect to either.

[pvx-]

I must start by saying that I have no idea about how dbus actually works and I use it only with playerctl to control mpv from scripts :).

The problem seems to be that I have dbus-daemon running only under my user, not as a system service. If I start the system service (dbus-daemon running as root), the warning disappears. When I stop it, it is back again :). Your "socket address" request probably works only with the system service, but should not be needed, if the action itself works with user-run dbus.

Btw. the file you mention doesn't exist on my system (Gentoo) even when the system service is running:

# stat /var/run/dbus/system_bus_address
stat: cannot stat '/var/run/dbus/system_bus_address': No such file or directory
# ls -l /var/run/dbus
total 0
srwxrwxrwx 1 root root 0 Aug 10 01:14 system_bus_socket

[acrisci]

a1cfd4a