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The v0.8.0 → v0.8.5 multi-monitor story (login widget on primary only, wallpaper-only on secondaries, KeyboardMode::Exclusive on the primary surface, hotplug handler) was a pile of workarounds that kept breaking on real hardware — after switching the greeter compositor to niri, the pointer could not cross onto the primary output and keyboard tab did not reach the UI. Niri in a normal user session has none of these issues; the bug was moongreet's own output-scoped policy. Back to basics: one layer-shell window on the built-in display, KeyboardMode::OnDemand. Secondary outputs stay under compositor control. No hotplug callbacks, no wallpaper-only windows, no DisplayLink phantom workarounds. -81 / +26 lines.
Moongreet
A greetd greeter for Wayland, built with Rust + GTK4 + gtk4-layer-shell. Part of the Moonarch ecosystem.
Features
- greetd IPC — Communicates via
$GREETD_SOCK(length-prefixed JSON) - User list — Parsed from
/etc/passwd(UID 1000–65533) - Avatars — AccountsService icons,
~/.facefallback, default SVG with theme tinting - Sessions — Discovered from
/usr/share/wayland-sessions/and/usr/share/xsessions/ - 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 + hotplug — Login UI on the built-in display, wallpaper-only on other monitors; hotplugged monitors get wallpaper 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
- Fingerprint — fprintd support via greetd multi-stage PAM (configurable)
- Journal logging —
journalctl -t moongreet, debug level viaMOONGREET_DEBUGenv var - Password wiping — Zeroize on drop
Requirements
- GTK 4
- gtk4-layer-shell (for Wayland fullscreen)
- greetd
Building
cargo build --release
Installation
# Install binary
sudo install -Dm755 target/release/moongreet /usr/bin/moongreet
# Install config
sudo mkdir -p /etc/moongreet
sudo cp config/moongreet.toml /etc/moongreet/moongreet.toml
System Setup
-
Edit
/etc/moongreet/moongreet.toml— set an absolute path for the wallpaper. -
Create cache directory:
sudo mkdir -p /var/cache/moongreet/last-session sudo chown greeter:greeter /var/cache/moongreet -
Configure greetd (
/etc/greetd/config.toml):[default_session] command = "niri -c /etc/greetd/niri-greeter.kdl" user = "greeter" -
Install the polkit rule so the greeter user can reboot / power off:
sudo install -Dm644 config/polkit/50-moongreet-power.rules \ /etc/polkit-1/rules.d/50-moongreet-power.rulesWithout this rule,
loginctl reboot/loginctl powerofffail because greetd's greeter session is inactive in logind.
Development
# Run tests
cargo test
# Build release
cargo build --release
# Run locally (without greetd, disables layer-shell)
MOONGREET_NO_LAYER_SHELL=1 ./target/release/moongreet
License
MIT