// build.rs
use std::env;
use std::process::Command;

fn main() {
    let repoid = match env::var("REPOID") {
        Ok(repoid) => repoid,
        Err(_) => {
            match Command::new("git")
                .args(&["rev-parse", "HEAD"])
                .output()
            {
                Ok(output) => {
                    String::from_utf8(output.stdout).unwrap()
                }
                Err(err) => {
                    panic!("git rev-parse failed: {}", err);
                }
            }
        }
    };

    println!("cargo:rustc-env=REPOID={}", repoid);
}
