mprober 0.10.12

This program aims to collect Linux system information including hostname, kernel version, uptime, RTC time, load average, CPU, memory, network interfaces and block devices. It can be used not only as a normal CLI tool, but also a web application with a front-end webpage and useful HTTP APIs.
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use std::io::{self, ErrorKind};

use crate::scanner_rust::{Scanner, ScannerError};

const KERNEL_VERSION_PATH: &str = "/proc/version";

#[inline]
pub fn get_kernel_version() -> Result<String, ScannerError> {
    let mut sc = Scanner::scan_path(KERNEL_VERSION_PATH)?;

    match sc.next()? {
        Some(linux) => {
            if linux.eq("Linux") {
                match sc.next()? {
                    Some(version) => {
                        if version.eq("version") {
                            match sc.next()? {
                                Some(kernel_version) => Ok(kernel_version),
                                None => {
                                    Err(ScannerError::IOError(io::Error::new(
                                        ErrorKind::UnexpectedEof,
                                        "Cannot find the kernel version.".to_string(),
                                    )))
                                }
                            }
                        } else {
                            Err(ScannerError::IOError(io::Error::new(
                                ErrorKind::InvalidInput,
                                "The first token is not `version`.".to_string(),
                            )))
                        }
                    }
                    None => {
                        Err(ScannerError::IOError(io::Error::new(
                            ErrorKind::UnexpectedEof,
                            "Cannot find the token `version`.".to_string(),
                        )))
                    }
                }
            } else {
                Err(ScannerError::IOError(io::Error::new(
                    ErrorKind::InvalidInput,
                    "The first token is not `Linux`.".to_string(),
                )))
            }
        }
        None => {
            Err(ScannerError::IOError(io::Error::new(
                ErrorKind::UnexpectedEof,
                "Cannot find the token `Linux`.".to_string(),
            )))
        }
    }
}