1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use std::io::{self, Error, ErrorKind};
14 use std::path::{self, PathBuf, AsPath};
15 use std::rand::{thread_rng, Rng};
17 /// A wrapper for a path to temporary directory implementing automatic
18 /// scope-based deletion.
20 path: Option<PathBuf>,
23 // How many times should we (re)try finding an unused random name? It should be
24 // enough that an attacker will run out of luck before we run out of patience.
25 const NUM_RETRIES: u32 = 1 << 31;
26 // How many characters should we include in a random file name? It needs to
27 // be enough to dissuade an attacker from trying to preemptively create names
28 // of that length, but not so huge that we unnecessarily drain the random number
29 // generator of entropy.
30 const NUM_RAND_CHARS: uint = 12;
33 /// Attempts to make a temporary directory inside of `tmpdir` whose name
34 /// will have the prefix `prefix`. The directory will be automatically
35 /// deleted once the returned wrapper is destroyed.
37 /// If no directory can be created, `Err` is returned.
38 #[allow(deprecated)] // rand usage
39 pub fn new_in<P: AsPath + ?Sized>(tmpdir: &P, prefix: &str)
40 -> io::Result<TempDir> {
42 let mut tmpdir = tmpdir.as_path();
43 if !tmpdir.is_absolute() {
44 let cur_dir = try!(env::current_dir());
45 storage = cur_dir.join(tmpdir);
47 // return TempDir::new_in(&cur_dir.join(tmpdir), prefix);
50 let mut rng = thread_rng();
51 for _ in 0..NUM_RETRIES {
52 let suffix: String = rng.gen_ascii_chars().take(NUM_RAND_CHARS).collect();
53 let leaf = if prefix.len() > 0 {
54 format!("{}.{}", prefix, suffix)
56 // If we're given an empty string for a prefix, then creating a
57 // directory starting with "." would lead to it being
58 // semi-invisible on some systems.
61 let path = tmpdir.join(&leaf);
62 match fs::create_dir(&path) {
63 Ok(_) => return Ok(TempDir { path: Some(path) }),
64 Err(ref e) if e.kind() == ErrorKind::AlreadyExists => {}
65 Err(e) => return Err(e)
69 Err(Error::new(ErrorKind::AlreadyExists,
70 "too many temporary directories already exist",
74 /// Attempts to make a temporary directory inside of `env::temp_dir()` whose
75 /// name will have the prefix `prefix`. The directory will be automatically
76 /// deleted once the returned wrapper is destroyed.
78 /// If no directory can be created, `Err` is returned.
80 pub fn new(prefix: &str) -> io::Result<TempDir> {
81 TempDir::new_in(&env::temp_dir(), prefix)
84 /// Unwrap the wrapped `std::path::Path` from the `TempDir` wrapper.
85 /// This discards the wrapper so that the automatic deletion of the
86 /// temporary directory is prevented.
87 pub fn into_path(mut self) -> PathBuf {
88 self.path.take().unwrap()
91 /// Access the wrapped `std::path::Path` to the temporary directory.
92 pub fn path(&self) -> &path::Path {
93 self.path.as_ref().unwrap()
96 /// Close and remove the temporary directory
98 /// Although `TempDir` removes the directory on drop, in the destructor
99 /// any errors are ignored. To detect errors cleaning up the temporary
100 /// directory, call `close` instead.
101 pub fn close(mut self) -> io::Result<()> {
105 fn cleanup_dir(&mut self) -> io::Result<()> {
107 Some(ref p) => fs::remove_dir_all(p),
113 impl Drop for TempDir {
115 let _ = self.cleanup_dir();
119 // the tests for this module need to change the path using change_dir,
120 // and this doesn't play nicely with other tests so these unit tests are located
121 // in src/test/run-pass/tempfile.rs