cosmic-session/data/start-cosmic

#!/bin/bash

# From: https://people.debian.org/~mpitt/systemd.conf-2016-graphical-session.pdf

# robustness: if the previous graphical session left some failed units,
# reset them so that they don't break this startup
for unit in $(systemctl --user --no-legend --state=failed --plain list-units | cut -f1 -d' '); do
    partof="$(systemctl --user show -p PartOf --value "$unit")"
    for target in cosmic-session.target graphical-session.target; do
        if [ "$partof" = "$target" ]; then
            systemctl --user reset-failed "$unit"
            break
        fi
    done
done

# /etc/profile contains a lot of important environment variables
source /etc/profile

# load user's profile if it exists
if [ -n "${HOME}" -a -f "${HOME}/.profile" ]
then
    source "${HOME}/.profile"
fi

export XDG_CURRENT_DESKTOP="${XDG_CURRENT_DESKTOP:=COSMIC}"
export XDG_SESSION_TYPE="${XDG_SESSION_TYPE:=wayland}"
export XCURSOR_THEME="${XCURSOR_THEME:=Pop}"
export _JAVA_AWT_WM_NONREPARENTING=1
export GDK_BACKEND=wayland,x11
export MOZ_ENABLE_WAYLAND=1
export QT_QPA_PLATFORM="wayland;xcb"

# import environment variables from the login manager
systemctl --user import-environment XDG_SESSION_TYPE XDG_CURRENT_DESKTOP

# Run cosmic-session
if [[ -z "${DBUS_SESSION_BUS_ADDRESS}" ]]; then
    exec /usr/bin/dbus-run-session -- /usr/bin/cosmic-session
else
    exec /usr/bin/cosmic-session
fi