# 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, `~/.face` fallback, 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** — 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
- **Fingerprint** — fprintd support via greetd multi-stage PAM (configurable)
- **Journal logging** — `journalctl -t moongreet`, debug level via `MOONGREET_DEBUG` env var
- **Password wiping** — Zeroize on drop

## Requirements

- GTK 4
- gtk4-layer-shell (for Wayland fullscreen)
- greetd

## Building

```bash
cargo build --release
```

## Installation

```bash
# 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

1. Edit `/etc/moongreet/moongreet.toml` — set an absolute path for the wallpaper.

2. Create cache directory:
   ```bash
   sudo mkdir -p /var/cache/moongreet/last-session
   sudo chown greeter:greeter /var/cache/moongreet
   ```

3. Configure greetd (`/etc/greetd/config.toml`):
   ```ini
   [default_session]
   command = "niri -c /etc/greetd/niri-greeter.kdl"
   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
# 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