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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::fs::{read_link, symlink_metadata};
use std::io::{self, empty, Write, BufWriter};
use std::path::Path;
use flate2;
use flate2::write::GzEncoder;
use rayon;
use tar::{Builder, Header};
use walkdir::WalkDir;
use xz2::write::XzEncoder;
use errors::*;
use util::*;
actor!{
#[derive(Debug)]
pub struct Tarballer {
/// The input folder to be compressed
input: String = "package",
/// The prefix of the tarballs
output: String = "./dist",
/// The folder in which the input is to be found
work_dir: String = "./workdir",
}
}
impl Tarballer {
/// Generate the actual tarballs
pub fn run(self) -> Result<()> {
let tar_gz = self.output.clone() + ".tar.gz";
let tar_xz = self.output.clone() + ".tar.xz";
// Remove any existing files
for file in &[&tar_gz, &tar_xz] {
if Path::new(file).exists() {
remove_file(file)?;
}
}
// Sort files by their suffix, to group files with the same name from
// different locations (likely identical) and files with the same
// extension (likely containing similar data).
let (dirs, mut files) = get_recursive_paths(&self.work_dir, &self.input)
.chain_err(|| "failed to collect file paths")?;
files.sort_by(|a, b| a.bytes().rev().cmp(b.bytes().rev()));
// Prepare the .tar.gz file
let gz = GzEncoder::new(create_new_file(tar_gz)?, flate2::Compression::best());
// Prepare the .tar.xz file
let xz = XzEncoder::new(create_new_file(tar_xz)?, 6);
// Write the tar into both encoded files. We write all directories
// first, so files may be directly created. (see rustup.rs#1092)
let tee = RayonTee(xz, gz);
let buf = BufWriter::with_capacity(1024 * 1024, tee);
let mut builder = Builder::new(buf);
let pool = rayon::ThreadPoolBuilder::new().num_threads(2).build().unwrap();
pool.install(move || {
for path in dirs {
let src = Path::new(&self.work_dir).join(&path);
builder.append_dir(&path, &src)
.chain_err(|| format!("failed to tar dir '{}'", src.display()))?;
}
for path in files {
let src = Path::new(&self.work_dir).join(&path);
append_path(&mut builder, &src, &path)
.chain_err(|| format!("failed to tar file '{}'", src.display()))?;
}
let RayonTee(xz, gz) = builder.into_inner()
.chain_err(|| "failed to finish writing .tar stream")?
.into_inner().ok().unwrap();
// Finish both encoded files
let (rxz, rgz) = rayon::join(
|| xz.finish().chain_err(|| "failed to finish .tar.xz file"),
|| gz.finish().chain_err(|| "failed to finish .tar.gz file"),
);
rxz.and(rgz).and(Ok(()))
})
}
}
fn append_path<W: Write>(builder: &mut Builder<W>, src: &Path, path: &String) -> Result<()> {
let stat = symlink_metadata(src)?;
let mut header = Header::new_gnu();
header.set_metadata(&stat);
if stat.file_type().is_symlink() {
let link = read_link(src)?;
header.set_link_name(&link)?;
builder.append_data(&mut header, path, &mut empty())?;
} else {
if cfg!(windows) {
// Windows doesn't really have a mode, so `tar` never marks files executable.
// Use an extension whitelist to update files that usually should be so.
const EXECUTABLES: [&'static str; 4] = ["exe", "dll", "py", "sh"];
if let Some(ext) = src.extension().and_then(|s| s.to_str()) {
if EXECUTABLES.contains(&ext) {
let mode = header.mode()?;
header.set_mode(mode | 0o111);
}
}
}
let file = open_file(src)?;
builder.append_data(&mut header, path, &file)?;
}
Ok(())
}
/// Returns all `(directories, files)` under the source path
fn get_recursive_paths<P, Q>(root: P, name: Q) -> Result<(Vec<String>, Vec<String>)>
where P: AsRef<Path>, Q: AsRef<Path>
{
let root = root.as_ref();
let name = name.as_ref();
if !name.is_relative() && !name.starts_with(root) {
bail!("input '{}' is not in work dir '{}'", name.display(), root.display());
}
let mut dirs = vec![];
let mut files = vec![];
for entry in WalkDir::new(root.join(name)) {
let entry = entry?;
let path = entry.path().strip_prefix(root)?;
let path = path_to_str(&path)?;
if entry.file_type().is_dir() {
dirs.push(path.to_owned());
} else {
files.push(path.to_owned());
}
}
Ok((dirs, files))
}
struct RayonTee<A, B>(A, B);
impl<A: Write + Send, B: Write + Send> Write for RayonTee<A, B> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.write_all(buf)?;
Ok(buf.len())
}
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
let (a, b) = (&mut self.0, &mut self.1);
let (ra, rb) = rayon::join(|| a.write_all(buf), || b.write_all(buf));
ra.and(rb)
}
fn flush(&mut self) -> io::Result<()> {
let (a, b) = (&mut self.0, &mut self.1);
let (ra, rb) = rayon::join(|| a.flush(), || b.flush());
ra.and(rb)
}
}
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