mirror of https://github.com/zcash/mpc.git
411 lines
13 KiB
Rust
411 lines
13 KiB
Rust
use std::io::{Read, Write, self};
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use std::thread;
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use std::time::Duration;
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use std::fs::{self, File};
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use std::process::Command;
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use protocol::*;
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const REMOTEPATH_ALPINE_RELEASE: &'static str = ".alpine-release";
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const REMOTEPATH_TEST_BURN: &'static str = "mpc_testburn";
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/// Clears the entire terminal screen, moves cursor to top left.
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pub fn reset() {
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print!("{}[2J", 27 as char);
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print!("{}[1;1H", 27 as char);
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println!("[MPC] Do not exit this process or shut the system off.");
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println!("");
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}
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pub fn prompt(s: &str) -> String {
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loop {
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let mut input = String::new();
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reset();
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println!("{}", s);
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println!("\x07");
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if io::stdin().read_line(&mut input).is_ok() {
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println!("Please wait...");
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return (&input[0..input.len()-1]).into();
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}
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}
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}
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pub struct TemporaryFile {
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path: String,
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f: Option<File>
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}
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impl TemporaryFile {
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pub fn reset(&mut self) {
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self.f = None;
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self.f = Some(File::open(&self.path).unwrap());
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}
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}
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impl Read for TemporaryFile {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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self.f.as_mut().unwrap().read(buf)
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}
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}
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impl Drop for TemporaryFile {
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fn drop(&mut self) {
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// Close the file descriptor...
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self.f = None;
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// Delete the file.
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loop {
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if fs::remove_file(&self.path).is_ok() {
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return;
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}
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println!("Failed to remove file! Trying again...");
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thread::sleep(Duration::from_secs(1));
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}
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}
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}
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pub fn write_to_dvd(dvd_path: &str, local_path: &str) -> bool {
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println!("Burning...");
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let output = Command::new("/usr/bin/xorriso")
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.arg("-outdev")
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.arg("/dev/sr0")
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.arg("-md5")
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.arg("on")
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.arg("-blank")
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.arg("as_needed")
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.arg("-map")
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.arg(local_path)
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.arg(dvd_path)
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.arg("-add")
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.arg(local_path)
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.arg("--")
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.arg("-commit")
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.arg("-close")
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.arg("on")
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.output()
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.expect("failed to execute xorriso");
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//let stderr = String::from_utf8_lossy(&output.stderr);
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//println!("stderr of write: {}", stderr);
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output.status.success()
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}
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pub enum DvdStatus {
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File(TemporaryFile),
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Blank,
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Error
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}
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pub fn read_from_dvd(dvd_path: &str, local_path: &str) -> DvdStatus {
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let output = Command::new("/usr/bin/xorriso")
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.arg("-md5")
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.arg("on")
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.arg("-osirrox")
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.arg("on")
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.arg("-indev")
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.arg("/dev/sr0")
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.arg("-extract")
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.arg(dvd_path)
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.arg(local_path)
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.output()
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.expect("failed to execute xorriso");
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if !output.status.success() {
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let stderr = String::from_utf8_lossy(&output.stderr);
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//println!("stderr of read: {}", stderr);
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if stderr.contains("is blank") {
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return DvdStatus::Blank
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} else {
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// Remove the file in case it did not write fully to local file, but
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// xorriso didn't delete the partial contents. (Not sure if this
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// actually ever happens, but we don't want participants running
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// out of memory.)
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let _ = fs::remove_file(local_path);
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return DvdStatus::Error
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}
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}
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match File::open(local_path) {
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Ok(f) => {
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DvdStatus::File(TemporaryFile {
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path: local_path.into(),
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f: Some(f)
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})
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},
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Err(_) => {
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DvdStatus::Error
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}
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}
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}
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pub fn eject() {
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let _ = Command::new("/usr/bin/eject")
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.arg("/dev/sr0")
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.output();
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}
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pub fn perform_diagnostics() {
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loop {
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if let DvdStatus::File(_) = read_from_dvd(REMOTEPATH_ALPINE_RELEASE, &format!("{}read_from_iso", ::DIRECTORY_PREFIX)) {
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break;
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} else {
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println!("ERROR! There was a problem reading from the drive or you removed the boot disk from the drive.");
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panic!("cannot recover");
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}
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}
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loop {
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if let DvdStatus::File(_) = read_from_dvd(REMOTEPATH_ALPINE_RELEASE, &format!("{}read_from_iso", ::DIRECTORY_PREFIX)) {
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eject();
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prompt("Please remove the disk from the drive and place it somewhere safe.\n\n \
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Press [ENTER] when ready to continue.");
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} else {
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break;
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}
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}
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eject();
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prompt("Please place a blank DVD into the drive. Press [ENTER] when ready to continue.");
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loop {
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if let DvdStatus::Blank = read_from_dvd(REMOTEPATH_ALPINE_RELEASE, &format!("{}read_from_iso", ::DIRECTORY_PREFIX)) {
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break;
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} else {
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eject();
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prompt("Try again! Please place a blank DVD into the drive. Press [ENTER] when ready to continue.");
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}
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}
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{
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let mut f = File::create(&format!("{}mpc_testburn", ::DIRECTORY_PREFIX)).unwrap();
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f.write(&[0xff, 0xff, 0xfa, 0x00]).unwrap();
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f.flush().unwrap();
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}
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loop {
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if write_to_dvd(REMOTEPATH_TEST_BURN, &format!("{}mpc_testburn", ::DIRECTORY_PREFIX)) {
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break;
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}
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thread::sleep(Duration::from_secs(3));
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}
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if !fs::remove_file(&format!("{}mpc_testburn", ::DIRECTORY_PREFIX)).is_ok() {
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panic!("could not remove local testburn file");
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}
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loop {
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if let DvdStatus::File(mut f) = read_from_dvd(REMOTEPATH_TEST_BURN, &format!("{}mpc_testburn", ::DIRECTORY_PREFIX)) {
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let mut contents = vec![];
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f.read_to_end(&mut contents).unwrap();
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assert!((&*contents) == &[0xff, 0xff, 0xfa, 0x00]);
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break;
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} else {
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println!("ERROR! There was a problem reading or writing with the drive.");
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panic!("cannot recover");
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}
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}
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eject();
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prompt("Please remove the DVD from the drive and label it 'testburn'. It will not be used again.\n\n\
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Press [ENTER] when the drive is clear.");
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loop {
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if let DvdStatus::Error = read_from_dvd(REMOTEPATH_ALPINE_RELEASE, &format!("{}read_from_iso", ::DIRECTORY_PREFIX)) {
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break;
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} else {
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eject();
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prompt("Try again! Please remove the DVD from the drive. Press [ENTER] when the drive is clear.");
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}
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}
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}
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pub fn hash_of_file<R: Read>(f: &mut R) -> Digest256 {
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Digest256::from_reader(f)
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}
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pub fn exchange_disc<
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T,
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R1,
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R2,
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F1: Fn(&mut File) -> Result<(), R1>,
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F2: Fn(&mut TemporaryFile, Option<Digest256>) -> Result<T, R2>
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>(
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our_disc: &str,
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their_disc: &str,
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our_cb: F1,
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their_cb: F2
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) -> T
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{
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let newdisc_localpath = &format!("{}disc{}", ::DIRECTORY_PREFIX, our_disc);
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let newdisc_remotepath = &format!("disc{}", our_disc);
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{
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let mut newdisc = File::create(newdisc_localpath).unwrap();
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our_cb(&mut newdisc).ok().unwrap();
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}
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if ::ASK_USER_TO_RECORD_HASHES {
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let mut newdisc = File::open(newdisc_localpath).unwrap();
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let h = hash_of_file(&mut newdisc);
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write_down_disc_please(&h, our_disc);
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}
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let mut already_burned = false;
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loop {
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if already_burned {
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eject();
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prompt(&format!("Insert disc '{}' from the other machine. If the burn of disc '{}' failed,\n\
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insert another blank disc to burn it again. Press [ENTER] when ready.",
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their_disc, our_disc));
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} else {
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eject();
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prompt(&format!("Please insert a blank DVD to burn disc '{}'. Then press [ENTER].",
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our_disc));
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}
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match read_from_dvd(&format!("disc{}", their_disc), &format!("{}disc{}", ::DIRECTORY_PREFIX, their_disc)) {
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DvdStatus::File(mut f) => {
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let h;
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if ::ASK_USER_TO_RECORD_HASHES {
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h = Some(hash_of_file(&mut f));
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write_down_disc_please(&h.clone().unwrap(), their_disc);
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f.reset();
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} else {
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h = None;
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}
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match their_cb(&mut f, h) {
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Ok(data) => {
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let _ = fs::remove_file(newdisc_localpath);
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return data;
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},
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Err(_) => {
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eject();
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prompt(&format!("The disc '{}' you inserted may be corrupted. Burn it again \
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on the other machine. Then insert the new disc '{}' and \
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press [ENTER].", their_disc, their_disc));
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}
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}
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},
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DvdStatus::Error => {
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eject();
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},
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DvdStatus::Blank => {
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write_to_dvd(newdisc_remotepath, newdisc_localpath);
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eject();
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already_burned = true;
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prompt(&format!("Disc {} has been burned. Label the disc and transfer it to the\n\
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other machine. Press [ENTER] when the drive is clear.", our_disc));
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}
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}
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}
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}
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pub fn write_disc<
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R,
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F: Fn(&mut File) -> Result<(), R>
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>(
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our_disc: &str,
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our_cb: F
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)
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{
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let newdisc_localpath = &format!("{}disc{}", ::DIRECTORY_PREFIX, our_disc);
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let newdisc_remotepath = &format!("disc{}", our_disc);
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{
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let mut newdisc = File::create(newdisc_localpath).unwrap();
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our_cb(&mut newdisc).ok().unwrap();
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}
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if ::ASK_USER_TO_RECORD_HASHES {
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let mut newdisc = File::open(newdisc_localpath).unwrap();
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let h = hash_of_file(&mut newdisc);
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write_down_disc_please(&h, our_disc);
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}
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let mut already_burned = false;
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eject();
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loop {
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if already_burned {
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prompt(&format!("If the burn of disc '{}' failed, you can insert another blank\n\
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DVD to burn again. Then press [ENTER] to continue.",
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our_disc));
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} else {
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prompt(&format!("Please insert a blank DVD to burn disc '{}'.\n\n\
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Then press [ENTER] to continue.",
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our_disc));
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}
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match read_from_dvd(newdisc_remotepath, newdisc_localpath) {
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DvdStatus::Blank => {
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write_to_dvd(newdisc_remotepath, newdisc_localpath);
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eject();
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already_burned = true;
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prompt(&format!("Disc {} has been burned. Label the disc and transfer it to the\n\
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other machine. Press [ENTER] when the drive is clear.", our_disc));
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},
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_ => {
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eject();
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}
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}
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}
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}
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pub fn read_disc<T, R, F: Fn(&mut TemporaryFile, Option<Digest256>) -> Result<T, R>>(name: &str, message: &str, cb: F) -> T {
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prompt(message);
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loop {
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match read_from_dvd(&format!("disc{}", name), &format!("{}disc{}", ::DIRECTORY_PREFIX, name)) {
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DvdStatus::File(mut f) => {
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let h;
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if ::ASK_USER_TO_RECORD_HASHES {
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h = Some(hash_of_file(&mut f));
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write_down_disc_please(&h.clone().unwrap(), name);
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f.reset();
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} else {
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h = None;
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}
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match cb(&mut f, h) {
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Ok(data) => {
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return data;
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},
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Err(_) => {
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eject();
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prompt(&format!("The disc you inserted may be corrupted. Burn it again \
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on the other machine.\n\n{}", message));
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}
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}
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},
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DvdStatus::Error => {
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eject();
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prompt(message);
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},
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DvdStatus::Blank => {
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eject();
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prompt(&format!("You placed a blank DVD in the drive, but we're expecting \
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disc '{}'.\n\n{}", name, message));
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}
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}
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}
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}
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pub fn write_down_disc_please(h: &Digest256, name: &str) {
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loop {
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if "recorded" == prompt(&format!("Please write down and publish the string: {}\n\
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It is the hash of disc '{}'.\n\n\
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Type 'recorded' and press [ENTER] to confirm you've written it down.",
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h.to_string(),
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name)) {
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break;
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}
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}
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}
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