get system release in rust

main.rs
use std::env;

fn main() {
    let os = env::consts::OS.to_lowercase(); // get current operating system
    
    let version = match os.as_str() {
        "linux" => {
            // Use uname system call to get release information on Unix-based systems
            let utsname = libc::utsname {
                sysname: [0; libc::UTSNAME_SYSNAME_LEN],
                nodename: [0; libc::UTSNAME_NODENAME_LEN],
                release: [0; libc::UTSNAME_RELEASE_LEN],
                version: [0; libc::UTSNAME_VERSION_LEN],
                machine: [0; libc::UTSNAME_MACHINE_LEN],
                domainname: [0; libc::UTSNAME_DOMAINNAME_LEN],
            };
            let r = unsafe { libc::uname(&mut utsname) };
            if r == 0 {
                // convert C-style string to Rust String and remove padding
                let release = String::from_utf8_lossy(&utsname.release)
                                .trim_end_matches('\0')
                                .to_string();
                release
            } else {
                "".to_string()
            }
        },
        "windows" => {
            // Use GetVersionEx() API call to get version information on Windows
            let os_version_info = winapi::um::sysinfoapi::OSVERSIONINFOEXW {
                dwOSVersionInfoSize: std::mem::size_of::<winapi::um::sysinfoapi::OSVERSIONINFOEXW>() as u32,
                ..Default::default()
            };
            let r = unsafe { winapi::um::sysinfoapi::GetVersionExW(
                                   &mut os_version_info as *mut winapi::um::sysinfoapi::OSVERSIONINFOEXW
                                )};
            if r != 0 {
                format!("{}.{}.{}", os_version_info.dwMajorVersion, os_version_info.dwMinorVersion, os_version_info.dwBuildNumber)
            } else {
                "".to_string()
            }
        },
        _ => "".to_string(),
    };
    
    println!("Operating System: {}, Release: {}", os, version);
}
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