axbuild 0.4.19

An OS build lib toolkit used by arceos
Documentation 
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use std::{
    env,
    ffi::{OsStr, OsString},
    sync::{LazyLock, Mutex},
};

mod boot;
mod discovery;
mod rendering;

static ENV_LOCK: LazyLock<Mutex<()>> = LazyLock::new(|| Mutex::new(()));

struct TempEnvVar {
    key: &'static str,
    original: Option<OsString>,
}

impl TempEnvVar {
    fn set(key: &'static str, value: impl AsRef<OsStr>) -> Self {
        let original = env::var_os(key);
        unsafe {
            env::set_var(key, value);
        }
        Self { key, original }
    }

    fn unset(key: &'static str) -> Self {
        let original = env::var_os(key);
        unsafe {
            env::remove_var(key);
        }
        Self { key, original }
    }
}

impl Drop for TempEnvVar {
    fn drop(&mut self) {
        match self.original.as_ref() {
            Some(value) => unsafe {
                env::set_var(self.key, value);
            },
            None => unsafe {
                env::remove_var(self.key);
            },
        }
    }
}