cloud-hypervisor/performance-metrics/build.rs

// Copyright © 2020 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
//

use std::process::Command;

fn main() {
    let mut git_human_readable = "v".to_owned() + env!("CARGO_PKG_VERSION");

    if let Ok(git_out) = Command::new("git").args(["describe", "--dirty"]).output() {
        if git_out.status.success() {
            if let Ok(git_out_str) = String::from_utf8(git_out.stdout) {
                git_human_readable = git_out_str;
            }
        }
    }

    // This println!() has a special behavior, as it will set the environment
    // variable GIT_HUMAN_READABLE, so that it can be reused from the binary.
    // Particularly, this is used from the main.rs to display the exact
    // version information.
    println!("cargo:rustc-env=GIT_HUMAN_READABLE={git_human_readable}");
}