You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ledger-udev.rs
    path of file: ./repos/solana/remote-wallet/src/bin
    
    the code of the file until where you have to start completion: /// Implements udev rules on Linux for supported Ledger devices
/// This script must be run with sudo privileges
use std::{
    error,
    fs::{File, OpenOptions},
    io::{Read, Write},
    p
    
fn main() -> Result<(), Box<dyn error::Error>> {
    if cfg!(target_os = "linux") {
        let mut contents = String::new();
        if Path::new("/etc/udev/rules.d/20-hw1.rules").exists() {
            let mut file = File::open(LEDGER_UDEV_RULES_LOCATION)?;
            file.read_to_string(&mut contents)?;
        }
        if !contents.contains(LEDGER_UDEV_RULES) {
            let mut file = OpenOptions::new()
                .append(true)
                .create(true)
                .open(LEDGER_UDEV_RULES_LOCATION)
                .map_err(|e| {
                    println!("Could not write to file; this script requires sudo privileges");
                    e
                })?;
            file.write_all(LEDGER_UDEV_RULES.as_bytes())?;

            Command::new("udevadm").arg("trigger").output().unwrap();

            Command::new("udevadm")
                .args(["control", "--reload-rules"])
                .output()
                .unwrap();

            println!("Ledger udev rules written");
        } else {
            println!("Ledger udev rules already in place");
        }
    } else {
        println!("Mismatched target_os; udev rules only required on linux os");
    }
    Ok(())
}