build.rs

use std::process::Command;

fn main() {
    let target = std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_string());
    let profile = std::env::var("PROFILE").unwrap_or_else(|_| "unknown".to_string());
    println!("cargo:rustc-env=BUILD_TARGET={target}");
    println!("cargo:rustc-env=BUILD_PROFILE={profile}");

    let git_commit = Command::new("git")
        .args(["describe", "--always", "--dirty"])
        .output()
        .ok()
        .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=BUILD_GIT_COMMIT={git_commit}");

    let rustc_version = Command::new("rustc")
        .arg("--version")
        .output()
        .ok()
        .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=BUILD_RUSTC_VERSION={rustc_version}");
}