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

1 files changed, 138 insertions, 0 deletions

diff --git a/backend/localplatformlinux.py b/backend/localplatformlinux.py
new file mode 100644
index 00000000..8b286019
--- /dev/null
+++ b/backend/localplatformlinux.py
@@ -0,0 +1,138 @@
+import os, pwd, grp, sys
+from subprocess import call, run, DEVNULL, PIPE, STDOUT
+from customtypes import UserType
+
+# Get the user id hosting the plugin loader
+def _get_user_id() -> int:
+    proc_path = os.path.realpath(sys.argv[0])
+    pws = sorted(pwd.getpwall(), reverse=True, key=lambda pw: len(pw.pw_dir))
+    for pw in pws:
+        if proc_path.startswith(os.path.realpath(pw.pw_dir)):
+            return pw.pw_uid
+    raise PermissionError("The plugin loader does not seem to be hosted by any known user.")
+
+# Get the user hosting the plugin loader
+def _get_user() -> str:
+    return pwd.getpwuid(_get_user_id()).pw_name
+
+# Get the effective user id of the running process
+def _get_effective_user_id() -> int:
+    return os.geteuid()
+
+# Get the effective user of the running process
+def _get_effective_user() -> str:
+    return pwd.getpwuid(_get_effective_user_id()).pw_name
+
+# Get the effective user group id of the running process
+def _get_effective_user_group_id() -> int:
+    return os.getegid()
+
+# Get the effective user group of the running process
+def _get_effective_user_group() -> str:
+    return grp.getgrgid(_get_effective_user_group_id()).gr_name
+
+# Get the user owner of the given file path.
+def _get_user_owner(file_path) -> str:
+    return pwd.getpwuid(os.stat(file_path).st_uid).pw_name
+
+# Get the user group of the given file path.
+def _get_user_group(file_path) -> str:
+    return grp.getgrgid(os.stat(file_path).st_gid).gr_name
+
+# Get the group id of the user hosting the plugin loader
+def _get_user_group_id() -> int:
+    return pwd.getpwuid(_get_user_id()).pw_gid
+
+# Get the group of the user hosting the plugin loader
+def _get_user_group() -> str:
+    return grp.getgrgid(_get_user_group_id()).gr_name
+
+def chown(path : str,  user : UserType = UserType.HOST_USER, recursive : bool = True) -> bool:
+    user_str = ""
+
+    if (user == UserType.HOST_USER):
+        user_str = _get_user()+":"+_get_user_group()
+    elif (user == UserType.EFFECTIVE_USER):
+        user_str = _get_effective_user()+":"+_get_effective_user_group()
+    else:
+        raise Exception("Unknown User Type")
+
+    result = call(["chown", "-R", user_str, path] if recursive else ["chown", user_str, path])
+    return result == 0
+
+def chmod(path : str, permissions : int, recursive : bool = True) -> bool:
+    result = call(["chmod", "-R", str(permissions), path] if recursive else ["chmod", str(permissions), path])
+    return result == 0
+
+def folder_owner(path : str) -> UserType|None:
+    user_owner = _get_user_owner(path)
+
+    if (user_owner == _get_user()):
+        return UserType.HOST_USER
+
+    elif (user_owner == _get_effective_user()):
+        return UserType.EFFECTIVE_USER
+
+    else:
+        return None 
+
+def get_home_path(user : UserType = UserType.HOST_USER) -> str:
+    user_name = "root"
+
+    if user == UserType.HOST_USER:
+        user_name = _get_user()
+    elif user == UserType.EFFECTIVE_USER:
+        user_name = _get_effective_user()
+    elif user == UserType.ROOT:
+        pass
+    else:
+        raise Exception("Unknown User Type")
+
+    return pwd.getpwnam(user_name).pw_dir
+
+def get_username() -> str:
+    return _get_user()
+
+def setgid(user : UserType = UserType.HOST_USER):
+    user_id = 0
+
+    if user == UserType.HOST_USER:
+        user_id = _get_user_group_id()
+    elif user == UserType.ROOT:
+        pass
+    else:
+        raise Exception("Unknown user type")
+    
+    os.setgid(user_id)
+
+def setuid(user : UserType = UserType.HOST_USER):
+    user_id = 0
+
+    if user == UserType.HOST_USER:
+        user_id = _get_user_id()
+    elif user == UserType.ROOT:
+        pass
+    else:
+        raise Exception("Unknown user type")
+    
+    os.setuid(user_id)
+
+async def service_active(service_name : str) -> bool:
+    res = run(["systemctl", "is-active", service_name], stdout=DEVNULL, stderr=DEVNULL)
+    return res.returncode == 0
+
+async def service_restart(service_name : str) -> bool:
+    call(["systemctl", "daemon-reload"])
+    cmd = ["systemctl", "restart", service_name]
+    res = run(cmd, stdout=PIPE, stderr=STDOUT)
+    return res.returncode == 0
+
+async def service_stop(service_name : str) -> bool:
+    cmd = ["systemctl", "stop", service_name]
+    res = run(cmd, stdout=PIPE, stderr=STDOUT)
+    return res.returncode == 0
+
+async def service_start(service_name : str) -> bool:
+    cmd = ["systemctl", "start", service_name]
+    res = run(cmd, stdout=PIPE, stderr=STDOUT)
+    return res.returncode == 0
\ No newline at end of file