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nixpkgs/nixos/modules/services/x11/display-managers/set-session.py

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Python
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#!/usr/bin/env python
import gi, argparse, os, logging, sys
gi.require_version("AccountsService", "1.0")
from gi.repository import AccountsService, GLib
from ordered_set import OrderedSet
def get_session_file(session):
system_data_dirs = GLib.get_system_data_dirs()
session_dirs = OrderedSet(
os.path.join(data_dir, session)
for data_dir in system_data_dirs
for session in {"wayland-sessions", "xsessions"}
)
session_files = OrderedSet(
os.path.join(dir, session + ".desktop")
for dir in session_dirs
if os.path.exists(os.path.join(dir, session + ".desktop"))
)
# Deal with duplicate wayland-sessions and xsessions.
# Needed for the situation in gnome-session, where there's
# a xsession named the same as a wayland session.
if any(map(is_session_wayland, session_files)):
session_files = OrderedSet(
session for session in session_files if is_session_wayland(session)
)
else:
session_files = OrderedSet(
session for session in session_files if is_session_xsession(session)
)
if len(session_files) == 0:
logging.warning("No session files are found.")
sys.exit(0)
else:
return session_files[0]
def is_session_xsession(session_file):
return "/xsessions/" in session_file
def is_session_wayland(session_file):
return "/wayland-sessions/" in session_file
def main():
parser = argparse.ArgumentParser(
description="Set session type for all normal users."
)
parser.add_argument("session", help="Name of session to set.")
args = parser.parse_args()
session = getattr(args, "session")
session_file = get_session_file(session)
user_manager = AccountsService.UserManager.get_default()
users = user_manager.list_users()
for user in users:
if user.is_system_account():
continue
else:
if is_session_wayland(session_file):
logging.debug(
f"Setting session name: {session}, as we found the existing wayland-session: {session_file}"
)
user.set_session(session)
elif is_session_xsession(session_file):
logging.debug(
f"Setting session name: {session}, as we found the existing xsession: {session_file}"
)
user.set_x_session(session)
else:
logging.error(f"Couldn't figure out session type for {session_file}")
sys.exit(1)
if __name__ == "__main__":
main()