uucore 0.4.0

uutils ~ 'core' uutils code library (cross-platform)
Documentation 
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// 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.
// spell-checker:ignore (path) osrelease

//! Test if the program is running under WSL
//! ref: <https://github.com/microsoft/WSL/issues/4555> @@ <https://archive.is/dP0bz>

/// Test if the program is running under WSL version 1
pub fn is_wsl_1() -> bool {
    #[cfg(target_os = "linux")]
    {
        if is_wsl_2() {
            return false;
        }
        if let Ok(b) = std::fs::read("/proc/sys/kernel/osrelease") {
            if let Ok(s) = std::str::from_utf8(&b) {
                let a = s.to_ascii_lowercase();
                return a.contains("microsoft") || a.contains("wsl");
            }
        }
    }
    false
}

/// Test if the program is running under WSL version 2
pub fn is_wsl_2() -> bool {
    #[cfg(target_os = "linux")]
    {
        if let Ok(b) = std::fs::read("/proc/sys/kernel/osrelease") {
            if let Ok(s) = std::str::from_utf8(&b) {
                let a = s.to_ascii_lowercase();
                return a.contains("wsl2");
            }
        }
    }
    false
}

/// Test if the program is running under WSL
pub fn is_wsl() -> bool {
    is_wsl_1() || is_wsl_2()
}