feat: apply cursor theme via GtkSettings (v0.9.0)

GTK4 under greetd does not honour XCURSOR_THEME reliably, so the greeter
showed the wrong cursor over GTK widgets on some machines. Set
gtk-cursor-theme-name / -size on GtkSettings from new [appearance] config
fields (cursor-theme, cursor-size), mirroring the gtk-theme handling and
reusing is_valid_gtk_theme validation.

Salvaged from commit 29ce185 — tagged v0.9.0 on 2026-04-24 but never
pushed. The orphan branch's keyboard refactor (v0.10.0) is discarded,
superseded by the v0.8.7 single-window fix.

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.
@@ -42,12 +40,12 @@ cd pkg && makepkg -sf && sudo pacman -U moongreet-git-<version>-x86_64.pkg.tar.z
 - `ipc.rs` — greetd Socket-Kommunikation (4-byte LE header + JSON)
 - `users.rs` — Benutzer aus /etc/passwd, Avatare (AccountsService + ~/.face), Symlink-Rejection
 - `sessions.rs` — Wayland/X11 Sessions aus .desktop Files
-- `power.rs` — Reboot/Shutdown via loginctl
+- `power.rs` — Reboot/Shutdown via systemctl (`--no-ask-password`)
 - `i18n.rs` — Locale-Erkennung (LANG / /etc/locale.conf) und String-Tabellen (DE/EN), alle UI- und Login-Fehlermeldungen
 - `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)
+- `config.rs` — TOML-Config ([appearance] background, gtk-theme, cursor-theme, cursor-size, fingerprint-enabled) + Wallpaper-Fallback + Blur-Validierung (finite, clamp 0–200) + Cursor-Size-Validierung (range 1–256)
 - `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, ein Greeter-Fenster auf dem fokussierten Output (kein `set_monitor`), `KeyboardMode::Exclusive`, systemd-journal-logger
 - `resources/style.css` — Catppuccin-inspiriertes Theme
 
 ## Design Decisions
@@ -62,6 +60,7 @@ cd pkg && makepkg -sf && sudo pacman -U moongreet-git-<version>-x86_64.pkg.tar.z
 - **Symmetrie mit moonlock/moonset**: Gleiche Patterns (i18n, config, users, power, GResource, GPU-Blur)
 - **Session-Validierung**: Relative Pfade erlaubt (greetd löst PATH auf), nur `..`/Null-Bytes werden abgelehnt
 - **GTK-Theme-Validierung**: Nur alphanumerisch + `_-+.` erlaubt, verhindert Path-Traversal über Config
+- **Cursor-Theme via GtkSettings**: GTK4 unter greetd liest `XCURSOR_THEME` env nicht zuverlässig — Cursor wird via `gtk::Settings::set_gtk_cursor_theme_name()` gesetzt, analog zu `gtk-theme`. Gleiche Validierung (`is_valid_gtk_theme`) gegen Path-Traversal.
 - **Journal-Logging**: `systemd-journal-logger` statt File-Logging — `journalctl -t moongreet`, Debug-Level per `MOONGREET_DEBUG` Env-Var
 - **File Permissions**: Cache-Verzeichnisse 0o700 via `DirBuilder::mode()`, Cache-Dateien 0o600
 - **Testbare Persistence**: `save_*_to`/`load_*_from` Varianten mit konfigurierbarem Pfad für Unit-Tests

Cargo.lock

@@ -575,7 +575,7 @@ dependencies = [
 
 [[package]]
 name = "moongreet"
-version = "0.7.1"
+version = "0.9.0"
 dependencies = [
  "gdk-pixbuf",
  "gdk4",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "moongreet"
-version = "0.7.3"
+version = "0.9.0"
 edition = "2024"
 description = "A greetd greeter for Wayland with GTK4 and Layer Shell"
 license = "MIT"

DECISIONS.md

@@ -1,5 +1,61 @@
 # Decisions
 
+## 2026-06-02 – Cursor theme via GtkSettings, salvaged from unpushed work (v0.9.0)
+
+- **Who**: ClaudeCode, Dom
+- **Why**: On some machines the greeter showed the wrong (GTK-default) cursor. GTK4 under greetd does not honour `XCURSOR_THEME` reliably — niri renders its own pointer from the kdl `cursor` block, but GTK widgets (button hover, text-input I-beam) read `gtk-cursor-theme-name` on `GtkSettings`, which without a session settings.ini stays at the GTK default. This fix was written and tagged v0.9.0 on 2026-04-24 but never pushed — it sat in a local-only branch while the bug kept shipping. Salvaged onto main now (cherry-picked from commit 29ce185).
+- **Tradeoffs**: Adds two `[appearance]` config fields (`cursor-theme`, `cursor-size`), symmetric with the existing `gtk-theme` field. Alternative — a system-wide `/etc/gtk-4.0/settings.ini` with `gtk-cursor-theme-name=` — would couple moongreet to host GTK config and affect every GTK4 app; rejected for the same reason as `gtk-theme`.
+- **How**: `config.rs` gains `cursor_theme: Option<String>` and `cursor_size: Option<i32>` (range-validated 1–256). `greeter::create_greeter_window` applies them via `gtk::Settings::set_gtk_cursor_theme_name()` / `set_gtk_cursor_theme_size()` after the existing gtk-theme handling, reusing `is_valid_gtk_theme()`. Deployed `moongreet.toml` gains `cursor-theme = "Sweet-cursors"` + `cursor-size = 24`. The orphaned April branch (v0.9.0/v0.10.0) is otherwise discarded; its keyboard refactor is superseded by the v0.8.7 single-window fix.
+
+## 2026-06-02 – Power buttons fixed (loginctl→systemctl) + single greeter window (v0.8.7)
+
+- **Who**: ClaudeCode, Dom
+- **Why**: At the greeter the reboot and shutdown buttons always failed with "Neustart/Herunterfahren fehlgeschlagen". Root cause: `power.rs` invoked `/usr/bin/loginctl reboot|poweroff`, but `loginctl` has no such verbs (systemd 260: `Unknown command verb 'reboot'`, exit 1) — power-management verbs belong to `systemctl`. moonlock and moonset already used `systemctl`; moongreet was the outlier (moonset carried the same bug until Mar 29). The polkit rule shipped in v0.8.3 treated the wrong layer — `CanReboot` returns `yes`, polkit was never the blocker. Separately, the multi-monitor greeter (v0.8.0/v0.8.2) gave `KeyboardMode::Exclusive` to only the first enumerated monitor's window, so on a multi-output setup the user could not type the password when focused on any other output.
+- **Tradeoffs**: Dropping the per-monitor + hotplug windows leaves secondary monitors blank during login; irrelevant for a login screen (input happens on one output). Exclusive keyboard binds input to the single greeter surface regardless of pointer position — the mouse may wander to a blank output but typing always reaches the greeter (chosen over compositor-level pointer confinement). The polkit rule is kept as a harmless safety net for the agent-less greeter session; its misleading "session is inactive" comment was corrected.
+- **How**: (1) `power::reboot`/`shutdown` call `/usr/bin/systemctl --no-ask-password reboot|poweroff` (matches moonlock; `--no-ask-password` fails fast instead of hanging on a missing askpass agent). (2) `main.rs` `activate()` creates one greeter window with no `set_monitor` (compositor places it on the focused output, like moonset) and `KeyboardMode::Exclusive`; the monitor loop, `connect_items_changed` hotplug handler, and the now-unused `glib::clone`/`std::rc::Rc` imports are removed. (3) The missing journal entries were investigated and are **not** a logging bug — the greeter user delivers all priorities to journald (verified live); the two button errors were lost because boot -2 was hard-cut before journald's 5-minute sync.
+
+## 2026-04-24 – Audit LOW fixes: stdout null, utf-8 path, debug value, hidden sessions (v0.8.6)
+
+- **Who**: ClaudeCode, Dom
+- **Why**: Four LOW findings cleared in a single pass. (1) `power::run_command` piped stdout it never read — structurally fragile even though current callers stay well under the pipe buffer. (2) Relative wallpaper paths were resolved via `to_string_lossy`, silently substituting `U+FFFD` for non-UTF-8 bytes and producing a path that cannot be opened. (3) `MOONGREET_DEBUG` escalated log verbosity on mere presence, so an empty variable leaked auth metadata into the journal. (4) `Hidden=true` and `NoDisplay=true` `.desktop` entries appeared in the session dropdown even though they mark disabled or stub sessions.
+- **Tradeoffs**: Gating debug on the literal value `"1"` is slightly stricter than most tools but matches the security-first posture. Filtering Hidden/NoDisplay means legitimately hidden but functional sessions are now unselectable from the greeter — acceptable, that is the convention these keys signal.
+- **How**: (1) `.stdout(Stdio::null())` replaces the unused pipe. (2) `to_string_lossy().to_string()` replaced by `to_str().map(|s| s.to_string())` with a `log::warn!` fallback for non-UTF-8 paths. (3) `match std::env::var("MOONGREET_DEBUG").ok().as_deref()` → `Some("1")` selects Debug, everything else Info. (4) `parse_desktop_file` reads `Hidden=` and `NoDisplay=`, returns `None` if either is `true`.
+
+## 2026-04-24 – Audit MEDIUM fixes: FP double-init, async avatar, symlink, FD leak (v0.8.5)
+
+- **Who**: ClaudeCode, Dom
+- **Why**: Six MEDIUM findings: (1) i18n test `all_string_fields_nonempty` missed four string fields — future locales could ship empty strings unnoticed. (2) Fast user-switch could spawn two parallel fprintd `init_async` calls because both coroutines saw `fingerprint_probe = None` before either stored its probe. (3) Synchronous avatar decode via `Pixbuf::from_file_at_scale` on the GTK main thread, stalling clicks. (4) Wallpaper `MAX_WALLPAPER_FILE_SIZE = 50 MB` bounded decode at up to ~2 s. (5) Fallback wallpaper path used `is_file()` which follows symlinks, inconsistent with the symlink-rejecting user-config path. (6) After a failed login the cloned `greetd_sock` descriptor remained in shared state until the next user switch, accumulating stale FDs across retries.
+- **Tradeoffs**: The init-race guard uses a bool flag on `GreeterState` + a 25 ms polling yield — cheap and race-free, but introduces a very short latency when a second probe waits. Lowering `MAX_WALLPAPER_FILE_SIZE` to 10 MB and `MAX_AVATAR_FILE_SIZE` to 5 MB caps worst-case decode but rejects legitimately huge (4K raw) wallpapers; acceptable for a greeter. Async avatar decode shows the default icon for a frame or two on cache miss.
+- **How**: (1) Four new `assert!` lines in `i18n::tests::all_string_fields_nonempty`. (2) New `fingerprint_probe_initializing: bool` on `GreeterState`, atomic check-and-set under `borrow_mut`, losing coroutines yield via `glib::timeout_future` until the winning init completes. (3) `set_avatar_from_file` uses `gio::File::read_future` + `Pixbuf::from_stream_at_scale_future` inside a `glib::spawn_future_local`, sets the default icon first, swaps on success. (4) Lower both size constants. (5) `resolve_background_path_with` now applies the same `symlink_metadata` + `!is_symlink` check to the Moonarch fallback. (6) After the login worker returns, `state.greetd_sock.lock().take()` drops the stale clone regardless of login outcome.
+
+## 2026-04-24 – Audit fix: shrink password-in-memory window (v0.8.4)
+
+- **Who**: ClaudeCode, Dom
+- **Why**: Security audit flagged the GTK password path as holding more copies of the plaintext password in memory than necessary. `attempt_login` wrapped the already-`Zeroizing<String>` caller value into a second `Zeroizing<String>` (`password.to_string()`), and the GTK `GString` backing `entry.text()` persisted in libc malloc'd memory until the allocator reused the page.
+- **Tradeoffs**: The GTK `GString` and the libc `strdup` copy on the PAM FFI boundary remain non-zeroizable — this is an inherent GTK/libc limitation, already documented in CLAUDE.md. This change reduces the Rust-owned copies to one and clears the `PasswordEntry` text field immediately after extraction to shorten the GTK-side window.
+- **How**: (1) `attempt_login` now takes `password: Zeroizing<String>` by value instead of `&str`, moving ownership into the `spawn_blocking` closure. (2) The redundant `Zeroizing::new(password.to_string())` inside `attempt_login` is removed. (3) `password_entry.set_text("")` is called right after the password is extracted from the activate handler, shortening the lifetime of the GTK-internal buffer.
+
+## 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 +93,7 @@
 
 ## 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 +107,13 @@
 
 ## 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/moongreet.toml

@@ -8,3 +8,8 @@ background = "/usr/share/backgrounds/wallpaper.jpg"
 # GTK theme name — must match a directory in /usr/share/themes/
 # Required because GTK4 under greetd does not reliably read settings.ini
 gtk-theme = "Colloid-Grey-Dark-Catppuccin"
+
+# Cursor theme name — must match a directory in /usr/share/icons/
+# GTK4 under greetd does not honour XCURSOR_THEME, so set it here.
+cursor-theme = "Sweet-cursors"
+cursor-size = 24

config/polkit/50-moongreet-power.rules

@@ -0,0 +1,12 @@
+// ABOUTME: Allow the greeter user to reboot and power off without authentication.
+// ABOUTME: Safety net for the agent-less greeter session — no askpass/polkit agent to answer a challenge.
+
+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/config.rs

@@ -25,6 +25,10 @@ struct Appearance {
     background_blur: Option<f32>,
     #[serde(rename = "gtk-theme")]
     gtk_theme: Option<String>,
+    #[serde(rename = "cursor-theme")]
+    cursor_theme: Option<String>,
+    #[serde(rename = "cursor-size")]
+    cursor_size: Option<i32>,
     #[serde(rename = "fingerprint-enabled")]
     fingerprint_enabled: Option<bool>,
 }
@@ -35,6 +39,8 @@ pub struct Config {
     pub background_path: Option<String>,
     pub background_blur: Option<f32>,
     pub gtk_theme: Option<String>,
+    pub cursor_theme: Option<String>,
+    pub cursor_size: Option<i32>,
     pub fingerprint_enabled: bool,
 }
 
@@ -44,6 +50,8 @@ impl Default for Config {
             background_path: None,
             background_blur: None,
             gtk_theme: None,
+            cursor_theme: None,
+            cursor_size: None,
             fingerprint_enabled: true,
         }
     }
@@ -68,8 +76,14 @@ pub fn load_config(config_paths: Option<&[PathBuf]>) -> Config {
                                 if bg_path.is_absolute() {
                                     merged.background_path = Some(bg);
                                 } else if let Some(parent) = path.parent() {
-                                    merged.background_path =
-                                        Some(parent.join(&bg).to_string_lossy().to_string());
+                                    let joined = parent.join(&bg);
+                                    match joined.to_str() {
+                                        Some(s) => merged.background_path = Some(s.to_string()),
+                                        None => log::warn!(
+                                            "Ignoring non-UTF-8 background path: {}",
+                                            joined.display()
+                                        ),
+                                    }
                                 }
                             }
                             if let Some(blur) = appearance.background_blur {
@@ -82,6 +96,16 @@ pub fn load_config(config_paths: Option<&[PathBuf]>) -> Config {
                             if appearance.gtk_theme.is_some() {
                                 merged.gtk_theme = appearance.gtk_theme;
                             }
+                            if appearance.cursor_theme.is_some() {
+                                merged.cursor_theme = appearance.cursor_theme;
+                            }
+                            if let Some(size) = appearance.cursor_size {
+                                if (1..=256).contains(&size) {
+                                    merged.cursor_size = Some(size);
+                                } else {
+                                    log::warn!("Ignoring cursor-size out of range (1–256): {size}");
+                                }
+                            }
                             if let Some(fp) = appearance.fingerprint_enabled {
                                 merged.fingerprint_enabled = fp;
                             }
@@ -98,7 +122,15 @@ pub fn load_config(config_paths: Option<&[PathBuf]>) -> Config {
         }
     }
 
-    log::debug!("Config result: background={:?}, blur={:?}, gtk_theme={:?}, fingerprint={}", merged.background_path, merged.background_blur, merged.gtk_theme, merged.fingerprint_enabled);
+    log::debug!(
+        "Config result: background={:?}, blur={:?}, gtk_theme={:?}, cursor_theme={:?}, cursor_size={:?}, fingerprint={}",
+        merged.background_path,
+        merged.background_blur,
+        merged.gtk_theme,
+        merged.cursor_theme,
+        merged.cursor_size,
+        merged.fingerprint_enabled
+    );
     merged
 }
 
@@ -123,10 +155,14 @@ pub fn resolve_background_path_with(config: &Config, moonarch_wallpaper: &Path)
         log::debug!("Wallpaper: config path {} not usable, trying fallbacks", path.display());
     }
 
-    // Moonarch ecosystem default
-    if moonarch_wallpaper.is_file() {
-        log::debug!("Wallpaper: using moonarch default {}", moonarch_wallpaper.display());
-        return Some(moonarch_wallpaper.to_path_buf());
+    // Moonarch ecosystem default — apply the same symlink rejection as the
+    // user-configured path for defense in depth. The fallback target is a
+    // system file, but the caller consumes the result via the same path.
+    if let Ok(meta) = moonarch_wallpaper.symlink_metadata() {
+        if meta.is_file() && !meta.file_type().is_symlink() {
+            log::debug!("Wallpaper: using moonarch default {}", moonarch_wallpaper.display());
+            return Some(moonarch_wallpaper.to_path_buf());
+        }
     }
 
     log::debug!("Wallpaper: no wallpaper found, using GTK background color");
@@ -321,6 +357,40 @@ mod tests {
         assert!(config.background_blur.is_none());
     }
 
+    // -- Cursor theme tests --
+
+    #[test]
+    fn load_config_cursor_theme_and_size() {
+        let dir = tempfile::tempdir().unwrap();
+        let conf = dir.path().join("moongreet.toml");
+        fs::write(
+            &conf,
+            "[appearance]\ncursor-theme = \"Sweet-cursors\"\ncursor-size = 32\n",
+        )
+        .unwrap();
+        let config = load_config(Some(&[conf]));
+        assert_eq!(config.cursor_theme.as_deref(), Some("Sweet-cursors"));
+        assert_eq!(config.cursor_size, Some(32));
+    }
+
+    #[test]
+    fn load_config_cursor_size_out_of_range_rejected() {
+        let dir = tempfile::tempdir().unwrap();
+        let conf = dir.path().join("moongreet.toml");
+        fs::write(&conf, "[appearance]\ncursor-size = 9999\n").unwrap();
+        let config = load_config(Some(&[conf]));
+        assert!(config.cursor_size.is_none());
+    }
+
+    #[test]
+    fn load_config_cursor_size_zero_rejected() {
+        let dir = tempfile::tempdir().unwrap();
+        let conf = dir.path().join("moongreet.toml");
+        fs::write(&conf, "[appearance]\ncursor-size = 0\n").unwrap();
+        let config = load_config(Some(&[conf]));
+        assert!(config.cursor_size.is_none());
+    }
+
     #[test]
     fn load_config_blur_inf_rejected() {
         let dir = tempfile::tempdir().unwrap();

src/greeter.rs

@@ -22,8 +22,8 @@ use crate::sessions::{self, Session};
 use crate::users::{self, User};
 
 const AVATAR_SIZE: i32 = 128;
-const MAX_AVATAR_FILE_SIZE: u64 = 10 * 1024 * 1024;
-const MAX_WALLPAPER_FILE_SIZE: u64 = 50 * 1024 * 1024;
+const MAX_AVATAR_FILE_SIZE: u64 = 5 * 1024 * 1024;
+const MAX_WALLPAPER_FILE_SIZE: u64 = 10 * 1024 * 1024;
 const LAST_USER_PATH: &str = "/var/cache/moongreet/last-user";
 const LAST_SESSION_DIR: &str = "/var/cache/moongreet/last-session";
 const MAX_USERNAME_LENGTH: usize = 256;
@@ -188,26 +188,8 @@ 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.
+/// Uses `blur_cache` to compute the blurred texture only once and reuse it.
 fn create_background_picture(
     texture: &gdk::Texture,
     blur_radius: Option<f32>,
@@ -251,6 +233,9 @@ struct GreeterState {
     user_switch_generation: u64,
     /// Cached fprintd device proxy — initialized once on first use.
     fingerprint_probe: Option<crate::fingerprint::FingerprintProbe>,
+    /// True while a probe init_async() is in flight. Prevents duplicate D-Bus
+    /// init when two user-switch probes race (both see probe == None).
+    fingerprint_probe_initializing: bool,
 }
 
 /// Create the main greeter window with login UI.
@@ -277,6 +262,23 @@ pub fn create_greeter_window(
         }
     }
 
+    // Apply cursor theme from config — GTK4 under greetd does not read XCURSOR_THEME
+    // reliably, so set the gtk-cursor-theme-name property directly.
+    if let Some(ref cursor) = config.cursor_theme {
+        if is_valid_gtk_theme(cursor) {
+            if let Some(settings) = gtk::Settings::default() {
+                settings.set_gtk_cursor_theme_name(Some(cursor));
+            }
+        } else {
+            log::warn!("Ignoring invalid cursor theme name: {cursor}");
+        }
+    }
+    if let Some(size) = config.cursor_size {
+        if let Some(settings) = gtk::Settings::default() {
+            settings.set_gtk_cursor_theme_size(size);
+        }
+    }
+
     let strings = load_strings(None);
     let fingerprint_enabled = config.fingerprint_enabled;
     let all_users = users::get_users(None);
@@ -300,6 +302,7 @@ pub fn create_greeter_window(
         fingerprint_available: false,
         user_switch_generation: 0,
         fingerprint_probe: None,
+        fingerprint_probe_initializing: false,
     }));
 
     // Root overlay for layering
@@ -511,6 +514,10 @@ pub fn create_greeter_window(
             let Some(user) = user else { return };
 
             let password = Zeroizing::new(entry.text().to_string());
+            // Clear the GTK entry's internal buffer as early as possible. GTK allocates
+            // the backing `GString` via libc malloc, which `zeroize` cannot reach — the
+            // best we can do is shorten the window during which it resides in memory.
+            entry.set_text("");
 
             let session = get_selected_session(&session_dropdown, &sessions_rc);
             let Some(session) = session else {
@@ -520,7 +527,7 @@ pub fn create_greeter_window(
 
             attempt_login(
                 &user,
-                &password,
+                password,
                 &session,
                 strings,
                 &state,
@@ -553,6 +560,18 @@ 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]
@@ -722,12 +741,33 @@ fn switch_to_user(
             #[strong]
             state,
             async move {
-                // Initialize probe on first use, then reuse cached device proxy
-                let needs_init = state.borrow().fingerprint_probe.is_none();
-                if needs_init {
+                // Initialize probe on first use, then reuse cached device proxy.
+                // Atomic check-and-set on fingerprint_probe_initializing prevents
+                // two concurrent probes (from a fast user switch) from both
+                // running init_async, which would open duplicate D-Bus connections.
+                let should_init = {
+                    let mut s = state.borrow_mut();
+                    if s.fingerprint_probe.is_some() || s.fingerprint_probe_initializing {
+                        false
+                    } else {
+                        s.fingerprint_probe_initializing = true;
+                        true
+                    }
+                };
+
+                if should_init {
                     let mut probe = crate::fingerprint::FingerprintProbe::new();
                     probe.init_async().await;
-                    state.borrow_mut().fingerprint_probe = Some(probe);
+                    let mut s = state.borrow_mut();
+                    s.fingerprint_probe = Some(probe);
+                    s.fingerprint_probe_initializing = false;
+                } else {
+                    // Another coroutine is initializing — yield until it publishes.
+                    while state.borrow().fingerprint_probe.is_none()
+                        && state.borrow().fingerprint_probe_initializing
+                    {
+                        glib::timeout_future(std::time::Duration::from_millis(25)).await;
+                    }
                 }
 
                 // Take probe out of state to avoid holding borrow across await
@@ -784,28 +824,40 @@ fn set_avatar_from_file(
         Ok(_) => {}
     }
 
-    let Some(path_str) = path.to_str() else {
-        log::debug!("Non-UTF-8 avatar path, skipping: {}", path.display());
-        image.set_icon_name(Some("avatar-default-symbolic"));
-        return;
-    };
+    // Show fallback immediately; decode asynchronously via GIO so the greeter
+    // stays responsive during a user-switch click.
+    image.set_icon_name(Some("avatar-default-symbolic"));
 
-    match Pixbuf::from_file_at_scale(path_str, AVATAR_SIZE, AVATAR_SIZE, true) {
-        Ok(pixbuf) => {
-            let texture = gdk::Texture::for_pixbuf(&pixbuf);
-            if let Some(name) = username {
-                state
-                    .borrow_mut()
-                    .avatar_cache
-                    .insert(name.to_string(), texture.clone());
+    let display_path = path.to_path_buf();
+    let file = gio::File::for_path(path);
+    let image_clone = image.clone();
+    let state_clone = state.clone();
+    let username_owned = username.map(String::from);
+
+    glib::spawn_future_local(async move {
+        let stream = match file.read_future(glib::Priority::default()).await {
+            Ok(s) => s,
+            Err(e) => {
+                log::debug!("Failed to open avatar {}: {e}", display_path.display());
+                return;
+            }
+        };
+        match Pixbuf::from_stream_at_scale_future(&stream, AVATAR_SIZE, AVATAR_SIZE, true).await {
+            Ok(pixbuf) => {
+                let texture = gdk::Texture::for_pixbuf(&pixbuf);
+                if let Some(ref name) = username_owned {
+                    state_clone
+                        .borrow_mut()
+                        .avatar_cache
+                        .insert(name.clone(), texture.clone());
+                }
+                image_clone.set_paintable(Some(&texture));
+            }
+            Err(e) => {
+                log::debug!("Failed to decode avatar {}: {e}", display_path.display());
             }
-            image.set_paintable(Some(&texture));
         }
-        Err(e) => {
-            log::debug!("Failed to load avatar {}: {e}", path.display());
-            image.set_icon_name(Some("avatar-default-symbolic"));
-        }
-    }
+    });
 }
 
 /// Load the default avatar SVG from GResources, tinted with the foreground color.
@@ -959,7 +1011,7 @@ fn set_login_sensitive(
 #[allow(clippy::too_many_arguments)]
 fn attempt_login(
     user: &User,
-    password: &str,
+    password: Zeroizing<String>,
     session: &Session,
     strings: &'static Strings,
     state: &Rc<RefCell<GreeterState>>,
@@ -998,7 +1050,6 @@ fn attempt_login(
     set_login_sensitive(password_entry, session_dropdown, false);
 
     let username = user.username.clone();
-    let password = Zeroizing::new(password.to_string());
     let exec_cmd = session.exec_cmd.clone();
     let session_name = session.name.clone();
     let greetd_sock = state.borrow().greetd_sock.clone();
@@ -1039,6 +1090,13 @@ fn attempt_login(
                 glib::timeout_future(min_response - elapsed).await;
             }
 
+            // The login_worker's own socket is already dropped by now; drop the
+            // shared clone too so repeated failed attempts do not accumulate
+            // stale file descriptors in state.greetd_sock.
+            if let Ok(mut g) = state.borrow().greetd_sock.lock() {
+                g.take();
+            }
+
             match result {
                 Ok(Ok(LoginResult::Success { username })) => {
                     save_last_user(&username);

src/i18n.rs

@@ -286,6 +286,10 @@ mod tests {
             assert!(!s.faillock_attempts_remaining.is_empty(), "{locale}: faillock_attempts_remaining");
             assert!(!s.faillock_locked.is_empty(), "{locale}: faillock_locked");
             assert!(!s.unexpected_greetd_response.is_empty(), "{locale}: unexpected_greetd_response");
+            assert!(!s.greetd_sock_not_absolute.is_empty(), "{locale}: greetd_sock_not_absolute");
+            assert!(!s.invalid_session_command.is_empty(), "{locale}: invalid_session_command");
+            assert!(!s.session_start_failed.is_empty(), "{locale}: session_start_failed");
+            assert!(!s.socket_error.is_empty(), "{locale}: socket_error");
         }
     }
 

src/main.rs

@@ -1,5 +1,5 @@
 // ABOUTME: Entry point for Moongreet — greetd greeter for Wayland.
-// ABOUTME: Sets up GTK Application, Layer Shell, CSS, and multi-monitor windows.
+// ABOUTME: Sets up GTK Application, Layer Shell, CSS, and a single greeter window.
 
 mod config;
 mod fingerprint;
@@ -24,13 +24,11 @@ fn load_css(display: &gdk::Display) {
     );
 }
 
-fn setup_layer_shell(window: &gtk::ApplicationWindow, keyboard: bool, layer: gtk4_layer_shell::Layer) {
+fn setup_layer_shell(window: &gtk::ApplicationWindow, layer: gtk4_layer_shell::Layer) {
     window.init_layer_shell();
     window.set_layer(layer);
     window.set_exclusive_zone(-1);
-    if keyboard {
-        window.set_keyboard_mode(gtk4_layer_shell::KeyboardMode::Exclusive);
-    }
+    window.set_keyboard_mode(gtk4_layer_shell::KeyboardMode::Exclusive);
     // Anchor to all edges for fullscreen
     window.set_anchor(gtk4_layer_shell::Edge::Top, true);
     window.set_anchor(gtk4_layer_shell::Edge::Bottom, true);
@@ -63,30 +61,20 @@ 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
-    {
-        let monitors = display.monitors();
-        log::debug!("Monitor count: {}", monitors.n_items());
-        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();
-            }
-        }
+        // Single greeter window. No set_monitor — the compositor places it on the
+        // focused output (same as moonset). Exclusive keyboard binds input to this
+        // surface regardless of pointer position; the mouse may wander to other
+        // outputs but typing always reaches the greeter. The previous per-monitor
+        // approach gave keyboard only to the first monitor's window, so a user on
+        // any other output could not type the password.
+        let window = greeter::create_greeter_window(bg_texture.as_ref(), &config, &blur_cache, app);
+        setup_layer_shell(&window, gtk4_layer_shell::Layer::Top);
+        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();
     }
 }
 
@@ -101,10 +89,12 @@ fn setup_logging() {
             eprintln!("Failed to create journal logger: {e}");
         }
     }
-    let level = if std::env::var("MOONGREET_DEBUG").is_ok() {
-        log::LevelFilter::Debug
-    } else {
-        log::LevelFilter::Info
+    // Require MOONGREET_DEBUG=1 to raise verbosity. Mere presence (e.g. an
+    // empty value in a session-setup script) must not escalate the journal
+    // to Debug, which leaks socket paths, usernames, and auth round counts.
+    let level = match std::env::var("MOONGREET_DEBUG").ok().as_deref() {
+        Some("1") => log::LevelFilter::Debug,
+        _ => log::LevelFilter::Info,
     };
     log::set_max_level(level);
 }

src/power.rs

@@ -1,4 +1,4 @@
-// ABOUTME: Power actions — reboot and shutdown via loginctl.
+// ABOUTME: Power actions — reboot and shutdown via systemctl.
 // ABOUTME: Wrappers around system commands for the greeter UI.
 
 use std::fmt;
@@ -40,7 +40,9 @@ fn run_command(action: &'static str, program: &str, args: &[&str]) -> Result<(),
     log::debug!("Power action: {action} ({program} {args:?})");
     let mut child = Command::new(program)
         .args(args)
-        .stdout(Stdio::piped())
+        // stdout is never read; piping without draining would deadlock on any
+        // command that writes more than one OS pipe buffer before wait() returns.
+        .stdout(Stdio::null())
         .stderr(Stdio::piped())
         .spawn()
         .map_err(|e| PowerError::CommandFailed {
@@ -97,14 +99,21 @@ fn run_command(action: &'static str, program: &str, args: &[&str]) -> Result<(),
     }
 }
 
-/// Reboot the system via loginctl.
+/// Reboot the system via systemctl.
+///
+/// `--no-ask-password` keeps systemctl from spawning an interactive askpass
+/// agent — the greeter session has none, so without it a denied authorization
+/// would hang instead of failing fast.
 pub fn reboot() -> Result<(), PowerError> {
-    run_command("reboot", "/usr/bin/loginctl", &["reboot"])
+    run_command("reboot", "/usr/bin/systemctl", &["--no-ask-password", "reboot"])
 }
 
-/// Shut down the system via loginctl.
+/// Shut down the system via systemctl.
+///
+/// `--no-ask-password` for the same reason as [`reboot`] — the agent-less
+/// greeter session has nothing to answer an authorization challenge.
 pub fn shutdown() -> Result<(), PowerError> {
-    run_command("shutdown", "/usr/bin/loginctl", &["poweroff"])
+    run_command("shutdown", "/usr/bin/systemctl", &["--no-ask-password", "poweroff"])
 }
 
 #[cfg(test)]

src/sessions.rs

@@ -23,6 +23,8 @@ fn parse_desktop_file(path: &Path, session_type: &str) -> Option<Session> {
     let mut in_section = false;
     let mut name: Option<String> = None;
     let mut exec_cmd: Option<String> = None;
+    let mut hidden = false;
+    let mut no_display = false;
 
     for line in content.lines() {
         let line = line.trim();
@@ -44,9 +46,18 @@ fn parse_desktop_file(path: &Path, session_type: &str) -> Option<Session> {
             && exec_cmd.is_none()
         {
             exec_cmd = Some(value.to_string());
+        } else if let Some(value) = line.strip_prefix("Hidden=") {
+            hidden = value.eq_ignore_ascii_case("true");
+        } else if let Some(value) = line.strip_prefix("NoDisplay=") {
+            no_display = value.eq_ignore_ascii_case("true");
         }
     }
 
+    if hidden || no_display {
+        log::debug!("Skipping {}: Hidden/NoDisplay entry", path.display());
+        return None;
+    }
+
     let name = name.filter(|s| !s.is_empty());
     let exec_cmd = exec_cmd.filter(|s| !s.is_empty());