fix: ship polkit rule so greeter user can reboot/power off (v0.8.3)

The rule that grants the greeter user authorization for
org.freedesktop.login1.{reboot,power-off} lived only in the moonarch
repo and was never installed by any PKGBUILD. On a fresh install the
reboot/shutdown buttons silently failed because greetd's greeter
session is inactive in logind and polkit denies inactive sessions by
default.

Move the rule into the moongreet source tree where it belongs and
ship it via moongreet-git.

CLAUDE.md

@@ -1,7 +1,5 @@
 # Moongreet
 
-**Name**: Selene (Mondgöttin — passend zu Moon-greet)
-
 ## Projekt
 
 Moongreet ist ein greetd-Greeter für Wayland, gebaut mit Rust + gtk4-rs + gtk4-layer-shell.
@@ -47,7 +45,7 @@ cd pkg && makepkg -sf && sudo pacman -U moongreet-git-<version>-x86_64.pkg.tar.z
 - `fingerprint.rs` — fprintd D-Bus Probe (gio::DBusProxy) — Geräteerkennung und Enrollment-Check für UI-Feedback
 - `config.rs` — TOML-Config ([appearance] background, gtk-theme, fingerprint-enabled) + Wallpaper-Fallback + Blur-Validierung (finite, clamp 0–200)
 - `greeter.rs` — GTK4 UI (Overlay-Layout), Login-Flow via greetd IPC (Multi-Stage-Auth für fprintd), Faillock-Warnung, Avatar-Cache, Last-User/Last-Session Persistence (0o700 Dirs, 0o600 Files)
-- `main.rs` — Entry Point, GTK App, Layer Shell Setup, Multi-Monitor, systemd-journal-logger
+- `main.rs` — Entry Point, GTK App, Layer Shell Setup, Multi-Monitor mit Hotplug via `items-changed` auf Monitor-ListModel (one greeter window per monitor, first gets keyboard), systemd-journal-logger
 - `resources/style.css` — Catppuccin-inspiriertes Theme
 
 ## Design Decisions

Cargo.lock

@@ -575,7 +575,7 @@ dependencies = [
 
 [[package]]
 name = "moongreet"
-version = "0.7.1"
+version = "0.8.3"
 dependencies = [
  "gdk-pixbuf",
  "gdk4",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "moongreet"
-version = "0.7.3"
+version = "0.8.3"
 edition = "2024"
 description = "A greetd greeter for Wayland with GTK4 and Layer Shell"
 license = "MIT"

DECISIONS.md

@@ -1,5 +1,26 @@
 # Decisions
 
+## 2026-04-21 – Ship polkit rule in moongreet instead of moonarch (v0.8.3)
+
+- **Who**: ClaudeCode, Dom
+- **Why**: Reboot/shutdown from the greeter silently failed on a fresh install. The polkit rule that grants the `greeter` user `org.freedesktop.login1.{reboot,power-off}` lived in the moonarch repo but was never installed by any PKGBUILD. The laptop worked only because the rule had been hand-deployed once.
+- **Tradeoffs**: Rule ownership moves from moonarch (system defaults) to moongreet (greeter-specific auth). Cleaner boundary — moonarch no longer needs to know about the greeter's auth requirements — but it means moongreet is now responsible for a system polkit rule that ties it to a fixed username (`greeter`).
+- **How**: Source file moved to `moongreet/config/polkit/50-moongreet-power.rules`, installed to `/etc/polkit-1/rules.d/` by `moongreet-git/PKGBUILD`. Old file removed from the moonarch repo.
+
+## 2026-04-09 – Monitor hotplug via ListModel items-changed
+
+- **Who**: ClaudeCode, Dom
+- **Why**: Greeter windows were only created at startup. If a monitor was hotplugged (e.g. HDMI reconnect), it would show no greeter UI. Aligned with moonlock's hotplug fix (same day).
+- **Tradeoffs**: Hotplugged monitors get greeter windows without keyboard input (keyboard stays on the primary monitor). Acceptable — user can still interact on the primary screen.
+- **How**: Connect to `display.monitors().connect_items_changed()` and create new greeter windows for added monitors. Shared state (config, texture, blur_cache) moved to Rc for the closure.
+
+## 2026-04-08 – Show greeter UI on all monitors instead of just one
+
+- **Who**: ClaudeCode, Dom
+- **Why**: moonlock showed its UI on all monitors via ext-session-lock-v1, but moongreet only showed the login UI on one monitor (compositor-picked) with wallpaper-only windows on the rest. Inconsistent UX across the ecosystem.
+- **Tradeoffs**: Each monitor gets its own full greeter widget tree (slightly more memory), but the UI is lightweight. Screen mirroring (e.g., wl-mirror/screencopy) was considered and rejected — it requires an external process, compositor screencopy support, adds latency, and fights Wayland's per-output model. One-window-per-monitor is the established Wayland pattern (swaylock, hyprlock, moonlock all do this).
+- **How**: Create one `create_greeter_window()` per monitor with `set_monitor()`, only the first gets `KeyboardMode::Exclusive`. Removed `create_wallpaper_window()` (no longer needed). No layer shell fallback keeps single-window mode for development.
+
 ## 2026-04-06 – Restore explicit gtk-theme in moongreet config
 
 - **Who**: ClaudeCode, Dom
@@ -37,7 +58,7 @@
 
 ## 2026-03-28 – Remove embedded wallpaper from binary
 
-- **Who**: Selene, Dom
+- **Who**: ClaudeCode, Dom
 - **Why**: Wallpaper is installed by moonarch to /usr/share/moonarch/wallpaper.jpg. Embedding a 374K JPEG in the binary is redundant. GTK background color (Catppuccin Mocha base) is a clean fallback.
 - **Tradeoffs**: Without moonarch installed AND without config, greeter shows plain dark background instead of wallpaper. Acceptable — that's the expected minimal state.
 - **How**: Remove wallpaper.jpg from GResources, return None from resolve_background_path when no file found, skip wallpaper window creation and background picture when no path available.
@@ -51,13 +72,13 @@
 
 ## 2026-03-28 – Optional background blur via `image` crate (superseded)
 
-- **Who**: Selene, Dom
+- **Who**: ClaudeCode, Dom
 - **Why**: Blurred wallpaper as greeter background is a common UX pattern for login screens
 - **Tradeoffs**: Adds `image` crate dependency (~15 transitive crates); CPU-side Gaussian blur at load time adds startup latency proportional to image size and sigma. Acceptable because blur runs once and the texture is shared across monitors.
 - **How**: `load_background_texture(bg_path, blur_radius)` loads texture, optionally applies `imageops::blur()`, returns blurred `gdk::Texture`. Config option `background-blur: Option<f32>` in `[appearance]` TOML section.
 
 ## 2026-03-28 – Audit fixes for shared wallpaper texture (v0.4.1)
-- **Who**: Selene, Dominik
+- **Who**: ClaudeCode, Dominik
 - **Why**: Quality, performance, and security audits flagged issues in `load_background_texture()`, debug logging, and greetd error handling
 - **Tradeoffs**: GResource path now requires UTF-8 (returns `None` for non-UTF-8 instead of aborting); 50 MB wallpaper limit is generous but prevents OOM; debug logging off by default trades observability for security
 - **How**: GResource branch via `resources_lookup_data()` + `from_bytes()` (no abort), file size limit, error details only at debug level, `MOONGREET_DEBUG` env var for log level, greetd retry path truncation matching `show_greetd_error()`

README.md

@@ -12,7 +12,7 @@ Part of the Moonarch ecosystem.
 - **Last user/session** — Remembered in `/var/cache/moongreet/`
 - **Power actions** — Reboot / Shutdown via `loginctl`
 - **Layer Shell** — Fullscreen via gtk4-layer-shell (TOP layer)
-- **Multi-monitor** — Greeter on primary, wallpaper on all monitors
+- **Multi-monitor + hotplug** — Full greeter UI on all monitors (keyboard input on first), hotplugged monitors get windows automatically
 - **GPU blur** — Background blur via GskBlurNode (shared cache across monitors)
 - **i18n** — German and English (auto-detected from system locale)
 - **Faillock warning** — Warns after 2 failed attempts, locked message after 3
@@ -60,6 +60,14 @@ sudo cp config/moongreet.toml /etc/moongreet/moongreet.toml
    user = "greeter"
    ```
 
+4. Install the polkit rule so the greeter user can reboot / power off:
+   ```bash
+   sudo install -Dm644 config/polkit/50-moongreet-power.rules \
+       /etc/polkit-1/rules.d/50-moongreet-power.rules
+   ```
+   Without this rule, `loginctl reboot` / `loginctl poweroff` fail because
+   greetd's greeter session is inactive in logind.
+
 ## Development
 
 ```bash

config/polkit/50-moongreet-power.rules

@@ -0,0 +1,12 @@
+// ABOUTME: Allow the greeter user to reboot and power off without authentication.
+// ABOUTME: Required because greetd's greeter session is inactive in logind.
+
+polkit.addRule(function(action, subject) {
+    if (subject.user === "greeter" &&
+        (action.id === "org.freedesktop.login1.reboot" ||
+         action.id === "org.freedesktop.login1.reboot-multiple-sessions" ||
+         action.id === "org.freedesktop.login1.power-off" ||
+         action.id === "org.freedesktop.login1.power-off-multiple-sessions")) {
+        return polkit.Result.YES;
+    }
+});

src/greeter.rs

@@ -188,24 +188,6 @@ fn render_blurred_texture(
     Some(renderer.render_texture(&node, Some(&viewport)))
 }
 
-/// Create a wallpaper-only window for secondary monitors.
-pub fn create_wallpaper_window(
-    texture: &gdk::Texture,
-    blur_radius: Option<f32>,
-    blur_cache: &Rc<RefCell<Option<gdk::Texture>>>,
-    app: &gtk::Application,
-) -> gtk::ApplicationWindow {
-    let window = gtk::ApplicationWindow::builder()
-        .application(app)
-        .build();
-    window.add_css_class("wallpaper");
-
-    let background = create_background_picture(texture, blur_radius, blur_cache);
-    window.set_child(Some(&background));
-
-    window
-}
-
 /// Create a Picture widget for the wallpaper background, optionally with GPU blur.
 /// Uses `blur_cache` to compute the blurred texture only once across all monitors.
 fn create_background_picture(
@@ -553,6 +535,18 @@ pub fn create_greeter_window(
     ));
     window.add_controller(key_controller);
 
+    // Grab keyboard focus after map — layer-shell keyboard grab is only
+    // confirmed by the compositor at map time, not at realize time.
+    window.connect_map(clone!(
+        #[weak]
+        password_entry,
+        move |_| {
+            glib::idle_add_local_once(move || {
+                password_entry.grab_focus();
+            });
+        }
+    ));
+
     // Defer initial user selection until realized (for correct theme colors)
     window.connect_realize(clone!(
         #[strong]

src/main.rs

@@ -11,9 +11,11 @@ mod sessions;
 mod users;
 
 use gdk4 as gdk;
+use glib::clone;
 use gtk4::prelude::*;
 use gtk4::{self as gtk, gio};
 use gtk4_layer_shell::LayerShell;
+use std::rc::Rc;
 fn load_css(display: &gdk::Display) {
     let css_provider = gtk::CssProvider::new();
     css_provider.load_from_resource("/dev/moonarch/moongreet/style.css");
@@ -63,30 +65,54 @@ fn activate(app: &gtk::Application) {
     let use_layer_shell = std::env::var("MOONGREET_NO_LAYER_SHELL").is_err();
     log::debug!("Layer shell: {use_layer_shell}");
 
-    // Main greeter window (login UI) — compositor picks focused monitor
-    let greeter_window = greeter::create_greeter_window(bg_texture.as_ref(), &config, &blur_cache, app);
     if use_layer_shell {
-        setup_layer_shell(&greeter_window, true, gtk4_layer_shell::Layer::Top);
-    }
-    greeter_window.present();
-
-    // Wallpaper-only windows on all monitors (only with layer shell)
-    if use_layer_shell
-        && let Some(ref texture) = bg_texture
-    {
+        // One greeter window per monitor — only the first gets keyboard input
         let monitors = display.monitors();
         log::debug!("Monitor count: {}", monitors.n_items());
+        let mut first = true;
         for i in 0..monitors.n_items() {
             if let Some(monitor) = monitors
                 .item(i)
                 .and_then(|obj| obj.downcast::<gdk::Monitor>().ok())
             {
-                let wallpaper = greeter::create_wallpaper_window(texture, config.background_blur, &blur_cache, app);
-                setup_layer_shell(&wallpaper, false, gtk4_layer_shell::Layer::Bottom);
-                wallpaper.set_monitor(Some(&monitor));
-                wallpaper.present();
+                let window = greeter::create_greeter_window(bg_texture.as_ref(), &config, &blur_cache, app);
+                setup_layer_shell(&window, first, gtk4_layer_shell::Layer::Top);
+                window.set_monitor(Some(&monitor));
+                window.present();
+                first = false;
             }
         }
+
+        // Handle monitor hotplug — create greeter windows for newly added monitors
+        // (without keyboard, since the primary monitor already has it)
+        let bg_texture = Rc::new(bg_texture);
+        let config = Rc::new(config);
+        monitors.connect_items_changed(clone!(
+            #[weak]
+            app,
+            #[strong]
+            blur_cache,
+            move |list, position, _removed, added| {
+                for i in position..position + added {
+                    if let Some(monitor) = list
+                        .item(i)
+                        .and_then(|obj| obj.downcast::<gdk::Monitor>().ok())
+                    {
+                        log::debug!("Monitor hotplug: creating greeter window");
+                        let window = greeter::create_greeter_window(
+                            bg_texture.as_ref().as_ref(), &config, &blur_cache, &app,
+                        );
+                        setup_layer_shell(&window, false, gtk4_layer_shell::Layer::Top);
+                        window.set_monitor(Some(&monitor));
+                        window.present();
+                    }
+                }
+            }
+        ));
+    } else {
+        // No layer shell — single window for development
+        let greeter_window = greeter::create_greeter_window(bg_texture.as_ref(), &config, &blur_cache, app);
+        greeter_window.present();
     }
 }