coreutils/fuzz/fuzz_targets/fuzz_common.rs

// This file is part of the uutils coreutils package.
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.

use std::process::Command;
use std::sync::atomic::Ordering;
use std::sync::{atomic::AtomicBool, Once};

static CHECK_GNU: Once = Once::new();
static IS_GNU: AtomicBool = AtomicBool::new(false);

pub fn is_gnu_cmd(cmd_path: &str) -> Result<(), std::io::Error> {
    CHECK_GNU.call_once(|| {
        let version_output = Command::new(cmd_path).arg("--version").output().unwrap();

        println!("version_output {:#?}", version_output);

        let version_str = String::from_utf8_lossy(&version_output.stdout).to_string();
        if version_str.contains("GNU coreutils") {
            IS_GNU.store(true, Ordering::Relaxed);
        }
    });

    if IS_GNU.load(Ordering::Relaxed) {
        Ok(())
    } else {
        panic!("Not the GNU implementation");
    }
}