fn main() {
    // Embed the git commit hash at build time for update checking.
    let hash = std::process::Command::new("git")
        .args(["rev-parse", "HEAD"])
        .output()
        .ok()
        .filter(|o| o.status.success())
        .and_then(|o| String::from_utf8(o.stdout).ok())
        .map(|s| s.trim().to_string())
        .unwrap_or_else(|| "unknown".to_string());

    println!("cargo:rustc-env=FFF_GIT_HASH={}", hash);
    println!("cargo:rerun-if-changed=../../.git/HEAD");
    println!("cargo:rerun-if-changed=../../.git/refs/");
}