Add cross-platform support to decky (#387)

* Import generic watchdog observer over platform specific import

* Use os.path rather than genericpath

* Split off socket management in plugin.py

* Don't specify multiprocessing start type

Default on linux is already fork

* Move all platform-specific functions to seperate files

TODO: make plugin.py platform agnostic

* fix import

* add backwards compat to helpers.py

* add backwards compatibility to helpers.py harder

* Testing autobuild for win

* Testing autobuild for win, try 2

* Testing autobuild for win, try 3

* Testing autobuild for win, try 4

* Create the plugins folder before attempting to use it

* Implement win get_username()

* Create win install script

* Fix branch guess from version

* Create .loader.version in install script

* Add .cmd shim to facilitate auto-restarts

* Properly fix branch guess from version

* Fix updater on windows

* Try 2 of fixing updates for windows

* Test

* pain

* Update install script

* Powershell doesn't believe in utf8

* Powershell good

* add ON_LINUX variable to localplatform

* Fix more merge issues

* test

* Move custom imports to main.py

* Move custom imports to after __main__ check 

Due to windows' default behaviour being spawn, it will spawn a new process and thus import into sys.path multiple times

* Log errors in get_system_pythonpaths() and get_loader_version() + 

split get_system_pythonpaths() on newline

* Remove whitespace in result of get_system_pythonpaths()

* use python3 on linux and python on windows in get_system_pythonpaths()

* Remove fork-specific urls

* Fix MIME types not working on Windows

backend/main.py

@@ -1,14 +1,15 @@
 # Change PyInstaller files permissions
 import sys
-from subprocess import call
+from localplatform import chmod, chown, service_stop, service_start, ON_WINDOWS
 if hasattr(sys, '_MEIPASS'):
-    call(['chmod', '-R', '755', sys._MEIPASS])
+    chmod(sys._MEIPASS, 755)
 # Full imports
 from asyncio import new_event_loop, set_event_loop, sleep
 from json import dumps, loads
 from logging import DEBUG, INFO, basicConfig, getLogger
-from os import getenv, chmod, path
+from os import getenv, path
 from traceback import format_exc
+import multiprocessing
 
 import aiohttp_cors
 # Partial imports
@@ -19,16 +20,15 @@ from aiohttp_jinja2 import setup as jinja_setup
 # local modules
 from browser import PluginBrowser
 from helpers import (REMOTE_DEBUGGER_UNIT, csrf_middleware, get_csrf_token,
-                     get_home_path, get_homebrew_path, get_user, get_user_group,
-                     stop_systemd_unit, start_systemd_unit)
+                     get_homebrew_path, mkdir_as_user, get_system_pythonpaths)
+                     
 from injector import get_gamepadui_tab, Tab, get_tabs, close_old_tabs
 from loader import Loader
 from settings import SettingsManager
 from updater import Updater
 from utilities import Utilities
+from customtypes import UserType
 
-USER = get_user()
-GROUP = get_user_group()
 HOMEBREW_PATH = get_homebrew_path()
 CONFIG = {
     "plugin_path": getenv("PLUGIN_PATH", path.join(HOMEBREW_PATH, "plugins")),
@@ -49,10 +49,11 @@ basicConfig(
 logger = getLogger("Main")
 
 def chown_plugin_dir():
-    code_chown = call(["chown", "-R", USER+":"+GROUP, CONFIG["plugin_path"]])
-    code_chmod = call(["chmod", "-R", "555", CONFIG["plugin_path"]])
-    if code_chown != 0 or code_chmod != 0:
-        logger.error(f"chown/chmod exited with a non-zero exit code (chown: {code_chown}, chmod: {code_chmod})")
+    if not path.exists(CONFIG["plugin_path"]): # For safety, create the folder before attempting to do anything with it
+        mkdir_as_user(CONFIG["plugin_path"])
+
+    if not chown(CONFIG["plugin_path"], UserType.HOST_USER) or not chmod(CONFIG["plugin_path"], 555):
+        logger.error(f"chown/chmod exited with a non-zero exit code")
 
 if CONFIG["chown_plugin_path"] == True:
     chown_plugin_dir()
@@ -79,9 +80,9 @@ class PluginManager:
 
         async def startup(_):
             if self.settings.getSetting("cef_forward", False):
-                self.loop.create_task(start_systemd_unit(REMOTE_DEBUGGER_UNIT))
+                self.loop.create_task(service_start(REMOTE_DEBUGGER_UNIT))
             else:
-                self.loop.create_task(stop_systemd_unit(REMOTE_DEBUGGER_UNIT))
+                self.loop.create_task(service_stop(REMOTE_DEBUGGER_UNIT))
             self.loop.create_task(self.loader_reinjector())
             self.loop.create_task(self.load_plugins())
 
@@ -173,6 +174,20 @@ class PluginManager:
         return run_app(self.web_app, host=CONFIG["server_host"], port=CONFIG["server_port"], loop=self.loop, access_log=None)
 
 if __name__ == "__main__":
+    if ON_WINDOWS:
+        # Fix windows/flask not recognising that .js means 'application/javascript'
+        import mimetypes
+        mimetypes.add_type('application/javascript', '.js')
+
+        # Required for multiprocessing support in frozen files
+        multiprocessing.freeze_support()
+
+    # Append the loader's plugin path to the recognized python paths
+    sys.path.append(path.join(path.dirname(__file__), "plugin"))
+
+    # Append the system and user python paths
+    sys.path.extend(get_system_pythonpaths())
+
     loop = new_event_loop()
     set_event_loop(loop)
     PluginManager(loop).run()