feat(qam-only): Move OGUI Steam from OS call to InteractiveProcess (#92)

* Make Steam an InterativeProcess
* Add output_to_log_file to InteractiveProcess.
* Use SharedThread to write to log file for Steam log.

core/only_qam.gd

@@ -8,6 +8,9 @@ var qam_state = load("res://assets/state/states/quick_access_menu.tres")
 var display := Gamescope.XWAYLAND.OGUI
 var qam_window_id: int
 var pid: int
+var shared_thread: SharedThread
+var steam_log: FileAccess
+var steam_process: InteractiveProcess
 var steam_window_id: int
 
 var logger := Log.get_logger("OQMain", Log.LEVEL.INFO)
@@ -24,11 +27,20 @@ func _init():
 
 ## Starts the --only-qam/--qam-only session.
 func _ready() -> void:
+	shared_thread = SharedThread.new()
+	shared_thread.start()
 	# Set window size to native resolution
 	var screen_size : Vector2i = DisplayServer.screen_get_size()
 	var window : Window = get_window()
 	window.set_size(screen_size)
 
+	var steam_log_path = OS.get_environment("HOME") + "/.steam-stdout.log"
+	steam_log = FileAccess.open(steam_log_path, FileAccess.WRITE)
+	var error := steam_log.get_open_error()
+	if error != OK:
+		logger.warn("Got error opening log file.")
+	else:
+		logger.debug("Opened Steam log at " + steam_log_path)
 	# Get user arguments
 	var args := OS.get_cmdline_user_args()
 	_setup_qam_only(args)
@@ -55,24 +67,24 @@ func _setup_qam_only(args: Array) -> void:
 
 	# Don't crash if we're not launching another program.
 	if args == []:
-		print("Nothing to do")
+		logger.warn("only-qam mode started with no launcher arguments.")
 		return
 	# Launch underlay in the sandbox 
 	var sandbox := PackedStringArray()
-	sandbox.append_array(["firejail", "--noprofile"])
+	sandbox.append_array(["--noprofile"])
 	var blacklist := InputManager.get_managed_gamepads()
 	for device in blacklist:
 		sandbox.append("--blacklist=%s" % device)
 	sandbox.append("--")
 	sandbox.append_array(args)
-	sandbox.append_array([">", "~/.steam-stdout.log"])
-	var sandbox_cmd = " ".join(sandbox)
-	print("Sandbox cmd: ", sandbox_cmd)
-	OS.create_process("bash", ["-c", sandbox_cmd])
-
+	steam_process = InteractiveProcess.new("firejail", sandbox)
+	if steam_process.start() != OK:
+		logger.error("Failed to start steam process.")
 	if not "steam" in args:
 		return
-
+	var logger_func := func(delta: float):
+		steam_process.output_to_log_file(steam_log)
+	shared_thread.add_process(logger_func)
 	# Look for steam
 	while not steam_window_id:
 
@@ -84,7 +96,7 @@ func _setup_qam_only(args: Array) -> void:
 				continue
 			if Gamescope.has_xprop(window, "STEAM_OVERLAY", display):
 				steam_window_id = window
-				print("Found steam! ", steam_window_id)
+				logger.debug("Found steam! " + str(steam_window_id))
 				break
 		# Wait a bit to reduce cpu load.
 		OS.delay_msec(1000)
@@ -113,5 +125,5 @@ func _on_qam_closed(_to: State) -> void:
 func _check_exit() -> void:
 	if Gamescope.has_xprop(steam_window_id, "STEAM_OVERLAY", display):
 		return
-	print("Steam closed. Shutting down.")
+	logger.debug("Steam closed. Shutting down.")
 	get_tree().quit()

core/systems/launcher/interactive_process.gd

@@ -62,3 +62,22 @@ func stop() -> void:
 	logger.debug("Stopping pid: " + str(pid))
 	OS.kill(pid)
 	pty = null
+
+
+func output_to_log_file(log_file: FileAccess, chunk_size: int = 1024) -> int:
+	if not log_file:
+		logger.warn("Unable to log output. Log file has not been opened.")
+		return ERR_FILE_CANT_OPEN
+	# Keep reading from the process until the buffer is empty
+	if not pty:
+		logger.warn("Unable to read from closed PTY")
+		return ERR_DOES_NOT_EXIST
+
+	# Keep reading from the process until the buffer is empty
+	var buffer := pty.read(chunk_size)
+	while buffer.size() != 0:
+		log_file.store_buffer(buffer)
+		buffer = pty.read(chunk_size)
+
+	log_file.flush()
+	return OK