build.rs

use std::process::Command;

fn main() {
    // Get git commit hash
    let git_hash = Command::new("git")
        .args(["rev-parse", "--short", "HEAD"])
        .output()
        .ok()
        .and_then(|output| {
            if output.status.success() {
                String::from_utf8(output.stdout).ok()
            } else {
                None
            }
        })
        .map(|s| s.trim().to_string())
        .unwrap_or_else(|| "unknown".to_string());

    // Get build timestamp
    let build_date = chrono::Utc::now()
        .format("%Y-%m-%d %H:%M:%S UTC")
        .to_string();

    // Get build target
    let build_target = std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_string());

    // Set environment variables for compile-time inclusion
    println!("cargo:rerun-if-changed=.git/HEAD");
    println!("cargo:rustc-env=GIT_COMMIT={}", git_hash);
    println!("cargo:rustc-env=BUILD_DATE={}", build_date);
    println!("cargo:rustc-env=BUILD_TARGET={}", build_target);
}