ambient_git_rev_init 0.3.1-rc.1

Ambient git revision helper. Host-only.
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fn git_rev(len: usize) -> String {
    std::str::from_utf8(
        &std::process::Command::new("git")
            .args(["rev-parse", &format!("--short={}", len), "HEAD"])
            .output()
            .expect("Failed to call `git rev-parse ...`")
            .stdout,
    )
    .expect("Invalid git revision encoding")
    .trim()
    .to_string()
}

fn git_dir() -> String {
    std::str::from_utf8(
        &std::process::Command::new("git")
            .args(["rev-parse", "--git-dir"])
            .output()
            .expect("Failed to call `git rev-parse --git-dir`")
            .stdout,
    )
    .expect("Invalid path encoding")
    .trim()
    .to_string()
}

fn main() {
    println!("cargo:rustc-env=REV_FULL={}", git_rev(40));
    println!("cargo:rustc-env=REV_10={}", git_rev(10));
    // This is a hack to get cargo to rebuild when the git log changes
    // Also generating the path here so it's platform independent (include_bytes! expects a platform-specific path!)
    println!(
        "cargo:rustc-env=GIT_LOG_HEAD={}",
        std::path::Path::new(&git_dir()).join("logs/HEAD").display()
    );
}