gp-vncsession

#!/bin/bash
set -eu

function start_service() {
	local executable="$1" && shift
	local executable_name="${executable##*/}"
	local args=("$@")
	start-stop-daemon --make-pidfile --pidfile "/tmp/${executable_name}.pid" --remove-pidfile \
		--quiet --background --start \
		--startas "$BASH" -- -c "exec $executable ${args[*]} > /tmp/${executable_name}.log 2>&1"
}
function log::info() {
	printf 'info[%s]: %s\n' "${0##*/}" "$@"
}

if test ! -e /tmp/.X0-lock; then {
	: "${DISPLAY:=":0"}"
	export DISPLAY
	VNC_PORT=5900
	NOVNC_PORT=6080

	# fix: Allocate 4GB shmem to avoid many GUI app crash (e.g google-chrome)
	# shellcheck disable=SC2015
	if ! mount | grep '/dev/shm.*size=4194304k' 1>/dev/null; then {
		sudo mount -t tmpfs shm -osize=4096m /dev/shm && log::info "Increased shmem to 4GB" ||
			log::info "Failed to increase shmem"
	}; fi

	# Start dbus daemon
	# sudo mkdir -p -m 0755 /run/dbus
	# if test ! -e /run/dbus/pid || test ! -e "/proc/$(</run/dbus/pid)"; then {
	# 	log::info "Spawning dbus system daemon"
	# 	sudo dbus-daemon --system --fork
	# }; fi
	log::info "$(sudo service dbus start | xargs)"

	## Custom session for tigervnc
	# sudo mkdir -p -m0755 /etc/X11/tigervnc /usr/share/xsessions;
	# sudo ln -srf "$HOME/.xinitrc" /etc/X11/tigervnc/Xsession;
	# printf '%s\n' '[Desktop Entry]' 'Name=Xsession' \
	#                 'Exec=/etc/X11/tigervnc/Xsession'| sudo tee /usr/share/xsessions/xfce4.desktop;

	## Custom config for tigervnc
	# mkdir -p -m0755 $HOME/.vnc;
	# printf '%s\n' 'session=xfce4' "geometry=${TIGERVNC_GEOMETRY:-1920x1080}" > $HOME/.vnc/config

	## Create .xinit
	# log::info 'Creating .xinit script'
	# printf '%s\n' '#!/bin/sh' 'exec dbus-launch --exit-with-session xfce4-session;' > $HOME/.xinitrc;
	chmod 755 "$HOME/.xinitrc"

	# Start vncserver
	log::info "Starting tigerVNC server on port $VNC_PORT"
	# vncserver -kill "${DISPLAY}"
	start_service "$(command -v vncserver)" -geometry "${TIGERVNC_GEOMETRY:-1920x1080}" -SecurityTypes None $DISPLAY

	# Wait
	log::info "Waiting for the desktop to be fully loaded ..."
	until pgrep xfdesktop 1>/dev/null; do {
		sleep 0.2
	}; done

	# Start web vncclient
	# no_vnc_cmd="bash novnc_proxy --vnc localhost:${VNC_PORT} --listen ${NOVNC_PORT}"
	# if ! pgrep -f "$no_vnc_cmd" 1>/dev/null; then {
	# 	log::info "Starting noVNC web client on $NOVNC_PORT"
	# 	{ cd /opt/novnc/utils && $no_vnc_cmd 2>&1; } >/tmp/novnc.log 2>&1 &
	# 	disown
	# }; fi
	log::info "Starting noVNC web client on port $NOVNC_PORT"
	start_service "$BASH" /opt/novnc/utils/novnc_proxy --vnc localhost:${VNC_PORT} --listen ${NOVNC_PORT}

}; fi