Swaybg doesn't recognize the output name as given by swaymsg

[zsolt-donca]

swaybg does not seem to recognize the output name exactly as its returned by swaymsg:

❯ swaymsg -t get_outputs
Output eDP-1 'Sharp Corporation 0x1516 Unknown' (focused)
  Current mode: 3840x2400 @ 59.994 Hz
  Position: 0,0
  Scale factor: 2.000000
  Scale filter: nearest
  Subpixel hinting: unknown
  Transform: normal
  Workspace: 1:  
  Max render time: off
  Adaptive sync: disabled
  Available modes:
    3840x2400 @ 59.994 Hz

Now if I run swaybg with literally the same output name, it produces the below message and does not actually set the wallpaper:

❯ swaybg -o 'Sharp Corporation 0x1516 Unknown' -i "/home/zdonca/Pictures/wallpaper/swaying_tree_to_right.png" -m fill

2022-06-26 13:54:41 - [swaybg/main.c:256] Could not find config for output eDP-1 (Sharp Corporation 0x1516)

When omitting the word "Unknown" from the name, it actually works:

❯ swaybg -o 'Sharp Corporation 0x1516' -i "/home/zdonca/Pictures/wallpaper/swaying_tree_to_right.png" -m fill
2022-06-26 13:55:38 - [swaybg/main.c:260] Found config Sharp Corporation 0x1516 for output eDP-1 (Sharp Corporation 0x1516)

Using the id of the output (eDP-1) also works. Using the name of my external displays also work (not connected above), the issue seems to be only with my laptop's built-in display's full name.

My issue comes from azote, but I think the root cause is in swaybg.

I am using Arch Linux and the AUR package swaybg-git. At the moment of writing, my build is baesd on 69c03f6.

[emersion]

swaybg uses a hack: it matches the output description. "Unknown" serial number has been removed from the output description in wlroots recently.

[gnull]

It's worth noting that this bug creates an inconsistency between the output names the output command in Sway config expects depending on the options you use it with (I'm using @zsolt-donca's output names for the example):

# This works
output 'Sharp Corporation 0x1516 Unknown' scale 1.5
# But this doesn't
output 'Sharp Corporation 0x1516 Unknown' background picture.jpg
# So one has to do
output 'Sharp Corporation 0x1516' background picture.jpg