fix: IPC byte order, globales GTK-Theme, Session-Vorauswahl

- ipc.py: !I (Big-Endian) → =I (Native Byte Order) für greetd-Protokoll
- Per-User GTK-Theme entfernt, stattdessen globales Theme aus moongreet.toml
- Last-Session pro User in /var/cache/moongreet/last-session/ speichern/laden
- PKGBUILD und install-Hook für last-session-Cache erweitert

src/moongreet/config.py

@@ -1,12 +1,15 @@
 # ABOUTME: Configuration loading from moongreet.toml.
 # ABOUTME: Parses appearance and behavior settings with wallpaper path resolution.
 
+import re
 import tomllib
 from contextlib import AbstractContextManager
 from dataclasses import dataclass
 from importlib.resources import as_file, files
 from pathlib import Path
 
+VALID_THEME_NAME = re.compile(r"^[A-Za-z0-9_-]+$")
+
 DEFAULT_CONFIG_PATHS = [
     Path("/etc/moongreet/moongreet.toml"),
 ]
@@ -17,6 +20,7 @@ class Config:
     """Greeter configuration loaded from moongreet.toml."""
 
     background: Path | None = None
+    gtk_theme: str | None = None
 
 
 def load_config(config_path: Path | None = None) -> Config:
@@ -51,6 +55,10 @@ def load_config(config_path: Path | None = None) -> Config:
             bg_path = config_path.parent / bg_path
         config.background = bg_path
 
+    gtk_theme = appearance.get("gtk-theme")
+    if gtk_theme and VALID_THEME_NAME.match(gtk_theme):
+        config.gtk_theme = gtk_theme
+
     return config
 
 

src/moongreet/greeter.py

@@ -21,13 +21,14 @@ from gi.repository import Gtk, Gdk, GLib, GdkPixbuf
 from moongreet.config import load_config, resolve_wallpaper_path
 from moongreet.i18n import load_strings, Strings
 from moongreet.ipc import create_session, post_auth_response, start_session, cancel_session
-from moongreet.users import User, get_users, get_avatar_path, get_user_gtk_theme
+from moongreet.users import User, get_users, get_avatar_path
 from moongreet.sessions import Session, get_sessions
 from moongreet.power import reboot, shutdown
 
 logger = logging.getLogger(__name__)
 
 LAST_USER_PATH = Path("/var/cache/moongreet/last-user")
+LAST_SESSION_DIR = Path("/var/cache/moongreet/last-session")
 FAILLOCK_MAX_ATTEMPTS = 3
 VALID_USERNAME = re.compile(r"^[a-zA-Z0-9_.-]+$")
 MAX_USERNAME_LENGTH = 256
@@ -93,6 +94,7 @@ class GreeterWindow(Gtk.ApplicationWindow):
         self._failed_attempts: dict[str, int] = {}
         self._bg_path = bg_path
 
+        self._apply_global_theme()
         self._build_ui()
         self._setup_keyboard_navigation()
         # Defer initial user selection until the window is realized,
@@ -286,26 +288,23 @@ class GreeterWindow(Gtk.ApplicationWindow):
                 # which works in ZIP wheels too, no exists() check needed
                 self._set_default_avatar()
 
-        # Apply user's GTK theme if available
-        self._apply_user_theme(user)
+        # Pre-select last used session for this user
+        self._select_last_session(user)
 
         # Focus password entry
         self._password_entry.grab_focus()
 
-    def _apply_user_theme(self, user: User) -> None:
-        """Load the user's preferred GTK theme from their settings.ini."""
-        gtk_config_dir = user.home / ".config" / "gtk-4.0"
-        theme_name = get_user_gtk_theme(config_dir=gtk_config_dir)
+    def _apply_global_theme(self) -> None:
+        """Apply the GTK theme from moongreet.toml configuration."""
+        theme_name = self._config.gtk_theme
+        if not theme_name:
+            return
 
         settings = Gtk.Settings.get_default()
         if settings is None:
             return
 
-        current = settings.get_property("gtk-theme-name")
-        if theme_name and current != theme_name:
-            settings.set_property("gtk-theme-name", theme_name)
-        elif not theme_name and current:
-            settings.reset_property("gtk-theme-name")
+        settings.set_property("gtk-theme-name", theme_name)
 
     def _get_foreground_color(self) -> str:
         """Get the current GTK theme foreground color as a hex string."""
@@ -479,6 +478,7 @@ class GreeterWindow(Gtk.ApplicationWindow):
 
                 if response.get("type") == "success":
                     self._save_last_user(user.username)
+                    self._save_last_session(user.username, session.name)
                     self._close_greetd_sock()
                     GLib.idle_add(self.get_application().quit)
                     return
@@ -533,6 +533,18 @@ class GreeterWindow(Gtk.ApplicationWindow):
             return self._sessions[idx]
         return None
 
+    def _select_last_session(self, user: User) -> None:
+        """Pre-select the last used session for a user in the dropdown."""
+        if not self._sessions:
+            return
+        last_session_name = self._load_last_session(user.username)
+        if not last_session_name:
+            return
+        for i, session in enumerate(self._sessions):
+            if session.name == last_session_name:
+                self._session_dropdown.set_selected(i)
+                return
+
     MAX_GREETD_ERROR_LENGTH = 200
 
     def _show_greetd_error(self, response: dict, fallback: str) -> None:
@@ -585,3 +597,30 @@ class GreeterWindow(Gtk.ApplicationWindow):
             LAST_USER_PATH.write_text(username)
         except OSError:
             pass  # Non-critical — cache dir may not be writable
+
+    MAX_SESSION_NAME_LENGTH = 256
+
+    @staticmethod
+    def _save_last_session(username: str, session_name: str) -> None:
+        """Save the last used session name for a user to cache."""
+        if not VALID_USERNAME.match(username) or len(username) > MAX_USERNAME_LENGTH:
+            return
+        try:
+            LAST_SESSION_DIR.mkdir(parents=True, exist_ok=True)
+            (LAST_SESSION_DIR / username).write_text(session_name)
+        except OSError:
+            pass  # Non-critical — cache dir may not be writable
+
+    @staticmethod
+    def _load_last_session(username: str) -> str | None:
+        """Load the last used session name for a user from cache."""
+        session_file = LAST_SESSION_DIR / username
+        if not session_file.exists():
+            return None
+        try:
+            name = session_file.read_text().strip()
+        except OSError:
+            return None
+        if not name or len(name) > GreeterWindow.MAX_SESSION_NAME_LENGTH:
+            return None
+        return name

src/moongreet/ipc.py

@@ -22,14 +22,14 @@ def _recvall(sock: Any, n: int) -> bytes:
 def send_message(sock: Any, msg: dict) -> None:
     """Send a length-prefixed JSON message to the greetd socket."""
     payload = json.dumps(msg).encode("utf-8")
-    header = struct.pack("!I", len(payload))
+    header = struct.pack("=I", len(payload))
     sock.sendall(header + payload)
 
 
 def recv_message(sock: Any) -> dict:
     """Receive a length-prefixed JSON message from the greetd socket."""
     header = _recvall(sock, 4)
-    length = struct.unpack("!I", header)[0]
+    length = struct.unpack("=I", header)[0]
 
     if length > MAX_PAYLOAD_SIZE:
         raise ConnectionError(f"Payload too large: {length} bytes (max {MAX_PAYLOAD_SIZE})")