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use anyhow::{bail, Context, Result};
use std::fs::{read_link, symlink_metadata};
use std::io::{empty, BufWriter, Write};
use std::path::Path;
use tar::{Builder, Header};
use walkdir::WalkDir;
use crate::{
compression::{CombinedEncoder, CompressionFormats},
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",
/// The formats used to compress the tarball.
compression_formats: CompressionFormats = CompressionFormats::default(),
}
}
impl Tarballer {
/// Generates the actual tarballs
pub fn run(self) -> Result<()> {
let tarball_name = self.output.clone() + ".tar";
let encoder = CombinedEncoder::new(
self.compression_formats
.iter()
.map(|f| f.encode(&tarball_name))
.collect::<Result<Vec<_>>>()?,
);
// 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)
.context("failed to collect file paths")?;
files.sort_by(|a, b| a.bytes().rev().cmp(b.bytes().rev()));
// Write the tar into both encoded files. We write all directories
// first, so files may be directly created. (See rust-lang/rustup.rs#1092.)
let buf = BufWriter::with_capacity(1024 * 1024, encoder);
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)
.with_context(|| 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)
.with_context(|| format!("failed to tar file '{}'", src.display()))?;
}
builder
.into_inner()
.context("failed to finish writing .tar stream")?
.into_inner()
.ok()
.unwrap()
.finish()?;
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))
}
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