1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
use failure::{bail, ResultExt};
use flate2::write::GzEncoder;
use std::fs::{read_link, symlink_metadata};
use std::io::{self, empty, BufWriter, Write};
use std::path::Path;
use tar::{Builder, Header};
use walkdir::WalkDir;
use xz2::write::XzEncoder;
use crate::util::*;
use crate::Result;
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 {
/// Generates 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)
.with_context(|_| "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. Note that preset 6 takes about 173MB of memory
// per thread, so we limit the number of threads to not blow out 32-bit hosts.
// (We could be more precise with `MtStreamBuilder::memusage()` if desired.)
let stream = xz2::stream::MtStreamBuilder::new()
.threads(Ord::min(num_cpus::get(), 8) as u32)
.preset(6)
.encoder()?;
let xz = XzEncoder::new_stream(create_new_file(tar_xz)?, stream);
// 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 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)
.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()))?;
}
let RayonTee(xz, gz) = builder
.into_inner()
.with_context(|_| "failed to finish writing .tar stream")?
.into_inner()
.ok()
.unwrap();
// Finish both encoded files.
let (rxz, rgz) = rayon::join(
|| {
xz.finish()
.with_context(|_| "failed to finish .tar.xz file")
},
|| {
gz.finish()
.with_context(|_| "failed to finish .tar.gz file")
},
);
rxz?;
rgz?;
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)
}
}
|
