Initial commit: battlenet-manager tray daemon and CLI

Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "battlenet-manager"
+version = "0.1.0"
+edition = "2021"
+description = "Battle.net launcher manager for Linux via umu/Proton-GE"
+
+[[bin]]
+name = "battlenet-manager"
+path = "src/main.rs"
+
+[dependencies]
+# CLI argument parsing
+clap = { version = "4", features = ["derive"] }
+
+# Config serialisation
+serde = { version = "1", features = ["derive"] }
+toml = "0.8"
+
+# GitHub API responses
+serde_json = "1"
+
+# Error handling
+anyhow = "1"
+
+# XDG config / data paths
+directories = "5"
+
+# System tray via D-Bus StatusNotifierItem (KDE, GNOME+AppIndicator, Xfce, etc.)
+ksni = "0.2"
+
+# HTTP for GE-Proton GitHub releases API
+reqwest = { version = "0.12", features = ["blocking", "json"] }

src/config.rs

@@ -0,0 +1,72 @@
+use anyhow::{Context, Result};
+use directories::ProjectDirs;
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Config {
+    /// Wine prefix directory
+    pub prefix_dir: PathBuf,
+    /// GE-Proton version string passed to PROTONPATH ("GE-Proton" tracks latest)
+    pub proton_version: String,
+    /// umu GAMEID used to look up protonfixes
+    pub gameid: String,
+    /// Directory where GE-Proton versions are installed
+    pub proton_compat_dir: PathBuf,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        let home = home_dir();
+        Self {
+            prefix_dir: home.join("Games/battlenet-umu"),
+            proton_version: "GE-Proton".into(),
+            gameid: "umu-battlenet".into(),
+            proton_compat_dir: home.join(".local/share/Steam/compatibilitytools.d"),
+        }
+    }
+}
+
+fn home_dir() -> PathBuf {
+    std::env::var("HOME")
+        .map(PathBuf::from)
+        .unwrap_or_else(|_| PathBuf::from("/tmp"))
+}
+
+impl Config {
+    fn config_path() -> Result<PathBuf> {
+        let dirs = ProjectDirs::from("co.aleshym", "", "battlenet-manager")
+            .context("Could not determine config directory")?;
+        Ok(dirs.config_dir().join("config.toml"))
+    }
+
+    /// Load config from disk, creating a default one if it doesn't exist.
+    pub fn load() -> Result<Self> {
+        let path = Self::config_path()?;
+        if !path.exists() {
+            let config = Self::default();
+            config.save().context("Failed to write default config")?;
+            return Ok(config);
+        }
+        let content = std::fs::read_to_string(&path)
+            .with_context(|| format!("Failed to read config from {path:?}"))?;
+        toml::from_str(&content).context("Failed to parse config.toml")
+    }
+
+    /// Write config to disk.
+    pub fn save(&self) -> Result<()> {
+        let path = Self::config_path()?;
+        if let Some(parent) = path.parent() {
+            std::fs::create_dir_all(parent)?;
+        }
+        let content = toml::to_string_pretty(self)?;
+        std::fs::write(&path, content)
+            .with_context(|| format!("Failed to write config to {path:?}"))
+    }
+
+    /// Absolute path to the Battle.net Launcher.exe inside the prefix.
+    pub fn launcher_exe(&self) -> PathBuf {
+        self.prefix_dir
+            .join("drive_c/Program Files (x86)/Battle.net/Battle.net Launcher.exe")
+    }
+}

src/diagnose.rs

@@ -0,0 +1,227 @@
+use crate::config::Config;
+use std::path::Path;
+use std::process::Command;
+
+struct Check {
+    label: &'static str,
+    pass: bool,
+    detail: String,
+}
+
+impl Check {
+    fn pass(label: &'static str, detail: impl Into<String>) -> Self {
+        Self { label, pass: true, detail: detail.into() }
+    }
+    fn fail(label: &'static str, detail: impl Into<String>) -> Self {
+        Self { label, pass: false, detail: detail.into() }
+    }
+}
+
+pub fn run(config: &Config) {
+    let mut checks: Vec<Check> = Vec::new();
+    let mut issues = 0u32;
+
+    // ── umu-run ──────────────────────────────────────────────────────────────
+    match which("umu-run") {
+        Some(p) => checks.push(Check::pass("umu-run", format!("found at {p}"))),
+        None => {
+            checks.push(Check::fail("umu-run", "not found — sudo pacman -S umu-launcher"));
+            issues += 1;
+        }
+    }
+
+    // ── Wine prefix ──────────────────────────────────────────────────────────
+    if config.prefix_dir.exists() {
+        checks.push(Check::pass("prefix", format!("{:?}", config.prefix_dir)));
+
+        let exe = config.launcher_exe();
+        if exe.exists() {
+            checks.push(Check::pass("launcher", "Battle.net Launcher.exe present"));
+        } else {
+            checks.push(Check::fail(
+                "launcher",
+                format!("not found at {exe:?} — run battlenet-umu-setup.sh"),
+            ));
+            issues += 1;
+        }
+
+        // Stale agent lock
+        let lock = config.prefix_dir
+            .join("drive_c/ProgramData/Battle.net/Agent/agent.lock");
+        if lock.exists() {
+            if let Ok(meta) = std::fs::metadata(&lock) {
+                if let Ok(modified) = meta.modified() {
+                    let age = std::time::SystemTime::now()
+                        .duration_since(modified)
+                        .unwrap_or_default()
+                        .as_secs();
+                    if age > 300 {
+                        checks.push(Check::fail(
+                            "agent.lock",
+                            format!("stale lock ({age}s old) — may cause BLZBNTBNA00000005; run: battlenet-manager kill"),
+                        ));
+                        issues += 1;
+                    } else {
+                        checks.push(Check::pass("agent.lock", format!("fresh ({age}s) — launcher may be running")));
+                    }
+                }
+            }
+        }
+
+        // Prefix ownership
+        if is_owned_by_current_user(&config.prefix_dir) {
+            checks.push(Check::pass("prefix owner", "owned by current user"));
+        } else {
+            checks.push(Check::fail(
+                "prefix owner",
+                "not owned by current user — Wine will misbehave",
+            ));
+            issues += 1;
+        }
+    } else {
+        checks.push(Check::fail(
+            "prefix",
+            format!("{:?} does not exist — run battlenet-umu-setup.sh", config.prefix_dir),
+        ));
+        issues += 1;
+    }
+
+    // ── GE-Proton ────────────────────────────────────────────────────────────
+    let installed_count = count_ge_proton(&config.proton_compat_dir);
+    if config.proton_version == "GE-Proton" {
+        if installed_count > 0 {
+            checks.push(Check::pass(
+                "proton",
+                format!("tracking latest; {installed_count} version(s) in {:?}", config.proton_compat_dir),
+            ));
+        } else {
+            checks.push(Check::pass(
+                "proton",
+                "tracking latest — will auto-download on first launch",
+            ));
+        }
+    } else {
+        let vpath = config.proton_compat_dir.join(&config.proton_version);
+        if vpath.exists() {
+            checks.push(Check::pass("proton", format!("{} installed", config.proton_version)));
+        } else {
+            checks.push(Check::fail(
+                "proton",
+                format!(
+                    "{} not found — run: battlenet-manager update-proton --version={}",
+                    config.proton_version, config.proton_version
+                ),
+            ));
+            issues += 1;
+        }
+    }
+
+    // ── Vulkan ───────────────────────────────────────────────────────────────
+    let vulkan_ok = Command::new("vulkaninfo")
+        .arg("--summary")
+        .output()
+        .map(|o| o.status.success())
+        .unwrap_or(false);
+    if vulkan_ok {
+        checks.push(Check::pass("vulkan", "vulkaninfo OK"));
+    } else {
+        checks.push(Check::fail("vulkan", "vulkaninfo failed or not installed — check GPU drivers and vulkan-tools"));
+        issues += 1;
+    }
+
+    // ── Display / XWayland ───────────────────────────────────────────────────
+    let display = std::env::var("DISPLAY").ok();
+    let wayland = std::env::var("WAYLAND_DISPLAY").ok();
+    match (display, wayland) {
+        (Some(d), Some(_)) => checks.push(Check::pass("display", format!("XWayland (DISPLAY={d})"))),
+        (Some(d), None)    => checks.push(Check::pass("display", format!("X11 (DISPLAY={d})"))),
+        (None, Some(_))    => {
+            checks.push(Check::fail(
+                "display",
+                "Wayland session but DISPLAY not set — XWayland not running; Battle.net needs it",
+            ));
+            issues += 1;
+        }
+        (None, None) => {
+            checks.push(Check::fail("display", "neither DISPLAY nor WAYLAND_DISPLAY is set"));
+            issues += 1;
+        }
+    }
+
+    // ── Running processes ────────────────────────────────────────────────────
+    let bnet_running = Command::new("pgrep")
+        .args(["-fi", "battle.net"])
+        .status()
+        .map(|s| s.success())
+        .unwrap_or(false);
+    if bnet_running {
+        checks.push(Check::pass("process", "Battle.net is currently running"));
+    } else {
+        checks.push(Check::pass("process", "Battle.net is not running"));
+    }
+
+    // ── Print ────────────────────────────────────────────────────────────────
+    println!();
+    for c in &checks {
+        let (symbol, colour, reset) = if c.pass {
+            ("✓", "\x1b[1;32m", "\x1b[0m")
+        } else {
+            ("✗", "\x1b[1;31m", "\x1b[0m")
+        };
+        println!("  {colour}{symbol}{reset} {:16} {}", c.label, c.detail);
+    }
+    println!();
+    if issues == 0 {
+        println!("  \x1b[1;32mAll checks passed.\x1b[0m");
+    } else {
+        println!("  \x1b[1;31m{issues} issue(s) found — see ✗ items above.\x1b[0m");
+    }
+    println!();
+}
+
+// ── helpers ──────────────────────────────────────────────────────────────────
+
+fn which(cmd: &str) -> Option<String> {
+    Command::new("which")
+        .arg(cmd)
+        .output()
+        .ok()
+        .filter(|o| o.status.success())
+        .and_then(|o| String::from_utf8(o.stdout).ok())
+        .map(|s| s.trim().to_string())
+}
+
+fn count_ge_proton(dir: &Path) -> usize {
+    std::fs::read_dir(dir)
+        .ok()
+        .map(|entries| {
+            entries
+                .filter_map(|e| e.ok())
+                .filter(|e| {
+                    e.file_name()
+                        .to_str()
+                        .map(|s| s.starts_with("GE-Proton"))
+                        .unwrap_or(false)
+                })
+                .count()
+        })
+        .unwrap_or(0)
+}
+
+fn is_owned_by_current_user(path: &Path) -> bool {
+    // Compare stat uid with current euid via id command (avoids libc dependency)
+    let uid_output = Command::new("id").arg("-u").output().ok();
+    let stat_output = Command::new("stat")
+        .args(["-c", "%u", path.to_str().unwrap_or("")])
+        .output()
+        .ok();
+
+    match (uid_output, stat_output) {
+        (Some(u), Some(s)) => {
+            let uid = String::from_utf8_lossy(&u.stdout).trim().to_string();
+            let owner = String::from_utf8_lossy(&s.stdout).trim().to_string();
+            uid == owner
+        }
+        _ => true, // assume OK if we can't check
+    }
+}

src/launcher.rs

@@ -0,0 +1,59 @@
+use crate::config::Config;
+use anyhow::{Context, Result};
+use std::thread;
+use std::time::Duration;
+
+/// Spawn Battle.net via umu-run and return immediately.
+pub fn launch(config: &Config) -> Result<()> {
+    let exe = config.launcher_exe();
+
+    if !exe.exists() {
+        anyhow::bail!(
+            "Battle.net Launcher.exe not found at {exe:?}\n\
+             Run 'battlenet-umu-setup.sh' to install it first."
+        );
+    }
+
+    std::process::Command::new("umu-run")
+        .env("WINEPREFIX", &config.prefix_dir)
+        .env("GAMEID", &config.gameid)
+        .env("PROTONPATH", &config.proton_version)
+        .arg(&exe)
+        .spawn()
+        .context(
+            "Failed to spawn umu-run. Is it installed?\n\
+             Run: sudo pacman -S umu-launcher",
+        )?;
+
+    Ok(())
+}
+
+/// Gracefully stop Battle.net: SIGTERM → wait 3 s → SIGKILL.
+pub fn kill() -> Result<()> {
+    let patterns = ["Battle\\.net", "Agent\\.exe", "Blizzard"];
+
+    for pattern in &patterns {
+        let _ = std::process::Command::new("pkill")
+            .args(["-15", "-f", pattern])
+            .status();
+    }
+
+    thread::sleep(Duration::from_secs(3));
+
+    for pattern in &patterns {
+        let _ = std::process::Command::new("pkill")
+            .args(["-9", "-f", pattern])
+            .status();
+    }
+
+    Ok(())
+}
+
+/// Returns true if any Battle.net process is currently running.
+pub fn is_running() -> bool {
+    std::process::Command::new("pgrep")
+        .args(["-fi", "battle.net"])
+        .status()
+        .map(|s| s.success())
+        .unwrap_or(false)
+}

src/main.rs

@@ -0,0 +1,66 @@
+mod config;
+mod diagnose;
+mod launcher;
+mod proton;
+mod tray;
+
+use anyhow::Result;
+use clap::{Parser, Subcommand};
+
+/// Battle.net launcher manager for Linux via umu/Proton-GE.
+///
+/// Running without a subcommand starts the system tray daemon.
+/// Use `launch` in your .desktop shortcut for a direct, no-UI launch.
+#[derive(Parser)]
+#[command(name = "battlenet-manager", version, about)]
+struct Cli {
+    #[command(subcommand)]
+    command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Start the system tray daemon (default when no subcommand given)
+    Tray,
+
+    /// Launch Battle.net immediately and return — use this in .desktop shortcuts
+    Launch,
+
+    /// Gracefully kill all Battle.net / Wine processes
+    Kill,
+
+    /// Check setup health and report any problems
+    Diagnose,
+
+    /// Download and switch GE-Proton versions
+    UpdateProton {
+        /// Install the latest release automatically
+        #[arg(long)]
+        latest: bool,
+
+        /// Install a specific version (e.g. GE-Proton9-20)
+        #[arg(long, value_name = "VERSION")]
+        version: Option<String>,
+
+        /// List recent releases and exit
+        #[arg(long)]
+        list: bool,
+    },
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+    let config = config::Config::load()?;
+
+    match cli.command.unwrap_or(Commands::Tray) {
+        Commands::Tray => tray::run(&config)?,
+        Commands::Launch => launcher::launch(&config)?,
+        Commands::Kill => launcher::kill()?,
+        Commands::Diagnose => diagnose::run(&config),
+        Commands::UpdateProton { latest, version, list } => {
+            proton::run(&config, latest, version, list)?;
+        }
+    }
+
+    Ok(())
+}

src/proton.rs

@@ -0,0 +1,183 @@
+use crate::config::Config;
+use anyhow::{Context, Result};
+use serde::Deserialize;
+use std::io::Write;
+
+const GITHUB_API: &str =
+    "https://api.github.com/repos/GloriousEggroll/proton-ge-custom/releases";
+
+#[derive(Deserialize)]
+struct Release {
+    tag_name: String,
+    assets: Vec<Asset>,
+}
+
+#[derive(Deserialize)]
+struct Asset {
+    name: String,
+    browser_download_url: String,
+}
+
+fn http_client() -> Result<reqwest::blocking::Client> {
+    reqwest::blocking::Client::builder()
+        .user_agent("battlenet-manager/0.1")
+        .build()
+        .context("Failed to build HTTP client")
+}
+
+fn fetch_releases(count: usize) -> Result<Vec<Release>> {
+    let url = format!("{GITHUB_API}?per_page={count}");
+    let releases: Vec<Release> = http_client()?
+        .get(&url)
+        .send()
+        .context("GitHub API request failed")?
+        .json()
+        .context("Failed to parse GitHub releases JSON")?;
+    Ok(releases)
+}
+
+fn fetch_release(tag: &str) -> Result<Release> {
+    let url = format!("{GITHUB_API}/tags/{tag}");
+    let release: Release = http_client()?
+        .get(&url)
+        .send()
+        .with_context(|| format!("GitHub API request failed for tag {tag}"))?
+        .json()
+        .context("Failed to parse release JSON")?;
+    Ok(release)
+}
+
+/// Download and extract a specific GE-Proton version.
+fn install_version(config: &Config, tag: &str) -> Result<()> {
+    let install_path = config.proton_compat_dir.join(tag);
+    if install_path.exists() {
+        println!("{tag} is already installed at {install_path:?}");
+        return Ok(());
+    }
+
+    println!("Fetching release metadata for {tag}...");
+    let release = fetch_release(tag)?;
+
+    let asset = release
+        .assets
+        .iter()
+        .find(|a| a.name.ends_with(".tar.gz"))
+        .with_context(|| format!("No .tar.gz asset found for {tag}"))?;
+
+    println!("Downloading {}...", asset.name);
+    let bytes = http_client()?
+        .get(&asset.browser_download_url)
+        .send()
+        .context("Download failed")?
+        .bytes()
+        .context("Failed to read response bytes")?;
+
+    // Write to a temp file then extract with system tar (avoids flate2/tar deps)
+    let tmp_path = std::env::temp_dir().join(format!("{tag}.tar.gz"));
+    {
+        let mut f = std::fs::File::create(&tmp_path)
+            .with_context(|| format!("Failed to create temp file {tmp_path:?}"))?;
+        f.write_all(&bytes).context("Failed to write archive")?;
+    }
+
+    println!("Extracting to {:?}...", config.proton_compat_dir);
+    std::fs::create_dir_all(&config.proton_compat_dir)?;
+
+    let status = std::process::Command::new("tar")
+        .args(["-xzf", tmp_path.to_str().unwrap_or("")])
+        .current_dir(&config.proton_compat_dir)
+        .status()
+        .context("Failed to run tar")?;
+
+    let _ = std::fs::remove_file(&tmp_path);
+
+    if !status.success() {
+        anyhow::bail!("tar extraction failed for {tag}");
+    }
+
+    println!("✓ {tag} installed");
+    Ok(())
+}
+
+/// Install the latest GE-Proton release (called from tray menu).
+pub fn install_latest(config: &Config) -> Result<()> {
+    println!("Checking for latest GE-Proton...");
+    let releases = fetch_releases(1)?;
+    let latest = releases
+        .into_iter()
+        .next()
+        .context("No releases returned from GitHub")?;
+    install_version(config, &latest.tag_name)
+}
+
+/// Entry point for the `update-proton` subcommand.
+pub fn run(config: &Config, latest: bool, version: Option<String>, list: bool) -> Result<()> {
+    if list {
+        return print_list(config);
+    }
+
+    let target = if latest {
+        let releases = fetch_releases(1)?;
+        releases
+            .into_iter()
+            .next()
+            .map(|r| r.tag_name)
+            .context("No releases found")?
+    } else if let Some(v) = version {
+        v
+    } else {
+        pick_interactively(config)?
+    };
+
+    install_version(config, &target)?;
+
+    // Update config to track this version
+    let mut updated = config.clone();
+    updated.proton_version = target.clone();
+    updated.save()?;
+    println!("Config updated: proton_version = \"{target}\"");
+
+    Ok(())
+}
+
+fn print_list(config: &Config) -> Result<()> {
+    println!("Recent GE-Proton releases:");
+    let releases = fetch_releases(10)?;
+    for r in &releases {
+        let installed = config.proton_compat_dir.join(&r.tag_name).exists();
+        let marker = if installed { "  \x1b[1;32m✓ installed\x1b[0m" } else { "" };
+        println!("  {}{}", r.tag_name, marker);
+    }
+    Ok(())
+}
+
+fn pick_interactively(config: &Config) -> Result<String> {
+    let releases = fetch_releases(10)?;
+
+    println!("Recent GE-Proton releases:");
+    for (i, r) in releases.iter().enumerate() {
+        let installed = config.proton_compat_dir.join(&r.tag_name).exists();
+        let marker = if installed { "  \x1b[1;32m✓\x1b[0m" } else { "" };
+        println!("  {:2}) {}{}", i + 1, r.tag_name, marker);
+    }
+
+    print!("\nEnter number [default: 1 = {}]: ", releases[0].tag_name);
+    std::io::stdout().flush()?;
+
+    let mut input = String::new();
+    std::io::stdin().read_line(&mut input)?;
+    let input = input.trim();
+
+    if input.is_empty() {
+        return Ok(releases[0].tag_name.clone());
+    }
+
+    if let Ok(n) = input.parse::<usize>() {
+        if n >= 1 && n <= releases.len() {
+            return Ok(releases[n - 1].tag_name.clone());
+        }
+    }
+
+    // Allow typing a version tag directly
+    Ok(input.to_string())
+}

src/tray.rs

@@ -0,0 +1,152 @@
+use crate::{config::Config, launcher};
+use anyhow::Result;
+use std::thread;
+use std::time::Duration;
+
+pub struct BattlenetTray {
+    pub config: Config,
+    /// Whether Battle.net is currently running; updated by background poller.
+    pub running: bool,
+}
+
+impl ksni::Tray for BattlenetTray {
+    fn id(&self) -> String {
+        "battlenet-manager".into()
+    }
+
+    fn icon_name(&self) -> String {
+        // Use the extracted Battle.net icon if available, fall back to a generic one.
+        let icon_path = std::env::var("HOME")
+            .map(std::path::PathBuf::from)
+            .unwrap_or_default()
+            .join(".local/share/icons/hicolor/256x256/apps/battlenet.png");
+
+        if icon_path.exists() {
+            "battlenet".into()
+        } else {
+            "applications-games".into()
+        }
+    }
+
+    fn title(&self) -> String {
+        if self.running {
+            "Battle.net (running)".into()
+        } else {
+            "Battle.net".into()
+        }
+    }
+
+    fn menu(&self) -> Vec<ksni::MenuItem<Self>> {
+        use ksni::menu::*;
+
+        let mut items: Vec<ksni::MenuItem<Self>> = vec![];
+
+        // Status label (non-interactive)
+        items.push(
+            StandardItem {
+                label: if self.running {
+                    "● Battle.net is running".into()
+                } else {
+                    "Battle.net".into()
+                },
+                enabled: false,
+                ..Default::default()
+            }
+            .into(),
+        );
+
+        items.push(ksni::MenuItem::Separator);
+
+        // Launch / Kill
+        if self.running {
+            items.push(
+                StandardItem {
+                    label: "Kill Battle.net".into(),
+                    icon_name: "process-stop".into(),
+                    activate: Box::new(|_this: &mut Self| {
+                        let _ = launcher::kill();
+                    }),
+                    ..Default::default()
+                }
+                .into(),
+            );
+        } else {
+            items.push(
+                StandardItem {
+                    label: "Launch Battle.net".into(),
+                    icon_name: "media-playback-start".into(),
+                    activate: Box::new(|this: &mut Self| {
+                        if let Err(e) = launcher::launch(&this.config) {
+                            eprintln!("battlenet-manager: launch failed: {e}");
+                        }
+                    }),
+                    ..Default::default()
+                }
+                .into(),
+            );
+        }
+
+        items.push(ksni::MenuItem::Separator);
+
+        // Update Proton (latest, background)
+        items.push(
+            StandardItem {
+                label: "Update GE-Proton (latest)".into(),
+                icon_name: "system-software-update".into(),
+                activate: Box::new(|this: &mut Self| {
+                    let config = this.config.clone();
+                    thread::spawn(move || {
+                        if let Err(e) = crate::proton::install_latest(&config) {
+                            eprintln!("battlenet-manager: proton update failed: {e}");
+                        }
+                    });
+                }),
+                ..Default::default()
+            }
+            .into(),
+        );
+
+        items.push(ksni::MenuItem::Separator);
+
+        // Quit
+        items.push(
+            StandardItem {
+                label: "Quit".into(),
+                icon_name: "application-exit".into(),
+                activate: Box::new(|_this: &mut Self| {
+                    std::process::exit(0);
+                }),
+                ..Default::default()
+            }
+            .into(),
+        );
+
+        items
+    }
+}
+
+/// Start the system tray daemon. Blocks until the process is killed.
+pub fn run(config: &Config) -> Result<()> {
+    let tray = BattlenetTray {
+        config: config.clone(),
+        running: launcher::is_running(),
+    };
+
+    let service = ksni::TrayService::new(tray);
+    let handle = service.spawn();
+
+    // Background thread: poll Battle.net process state every 2 s and update the tray.
+    let poller_handle = handle.clone();
+    thread::spawn(move || loop {
+        let running = launcher::is_running();
+        poller_handle.update(|tray: &mut BattlenetTray| {
+            tray.running = running;
+        });
+        thread::sleep(Duration::from_secs(2));
+    });
+
+    // Keep the main thread alive.
+    loop {
+        thread::sleep(Duration::from_secs(60));
+    }
+}