picom --invert-color-include fails when the HOME env is unset

[milahu]

when i run picom in an environment where HOME is unset
then this does not work = the colors of chromium are not inverted

picom --invert-color-include 'class_g="Chromium-browser"'

fixed by setting HOME to an empty tempdir

picom version 10.2

test-picom.py

im calling picom from python, so this looks like

#!/usr/bin/env python3

# required packages: tigervnc picom chromium

import os
import subprocess
import tempfile
import time

vnc_display = ":2"

args = [
    "Xvnc",
    # dont require a password
    "-SecurityTypes", "none",
    "-geometry", "1024x768", # default: 1024x768
    "-depth", "16", # default: 24
    "-FrameRate", "10", # maximum frame rate. default: 60
    "-localhost", # accept connections only from localhost
    vnc_display,
]
proc_xvnc = subprocess.Popen(
    args,
)
time.sleep(1)

args = ["vncviewer", vnc_display]
proc_vncviewer = subprocess.Popen(
    args,
)
time.sleep(1)

# minimal env: only PATH is set
custom_env = {
    "PATH": os.environ["PATH"],
    "DISPLAY": vnc_display,
    # setting HOME is required to fix "picom --invert-color-include"
    #"HOME": tempfile.mkdtemp(suffix="-temp_home"),
}

args = [
    "picom",

    # invert colors of chromium window
    "--invert-color-include", 'class_g="Chromium-browser"',

    # invert colors of all windows, also "save file" dialogs
    #"--invert-color-include", 'name ~= "."',

    # dont invert colors for the "feh" image viewer
    #"--invert-color-include", 'class_g != "feh"',

    # fix "picom --invert-color-include" with unset HOME
    "--config", "/dev/null",
]
proc_picom = subprocess.Popen(
    args,
    env=custom_env,
)
time.sleep(1)

args = ["chromium"]
proc_chromium = subprocess.Popen(
    args,
    env=custom_env,
)
time.sleep(5)

proc_vncviewer.kill()
proc_chromium.kill()
proc_picom.kill()
proc_xvnc.kill()

[yshui]

can you run picom with --config /dev/null? to make sure it's indeed the command line option being affected.

[milahu]

yes that works. i have updated the code in my first comment

[absolutelynothelix]

can't reproduce:

btw, the class_g of chromium is Chromium for me, not Chromium-browser.

[milahu]

can't reproduce

remove --config /dev/null
then invert-color-include should fail

the class_g of chromium is Chromium for me, not Chromium-browser

im using ungoogled-chromium...
use --invert-color-include 'name ~= "."' to invert colors of all windows

chromium darkmode is controlled by the XDG_DATA_DIRS env

[absolutelynothelix]

remove --config /dev/null
then invert-color-include should fail

still can't reproduce:

maybe unset HOME isn't enough to emulate an environment without the HOME environment variable set? 🤔

btw, this is how it looks normally for a reference:

[milahu]

whatabout the python script from #1148 (comment)

[absolutelynothelix]

oh, it actually causes a segfault 😅

does #1157 fix the issue for you? btw, thanks for the script, it helped a lot in triggering the bug.