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// Copyright 2013 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. //! Temporary files and directories use io::{fs, IoResult}; use io; use libc; use ops::Drop; use option::Option; use option::Option::{None, Some}; use os; use path::{Path, GenericPath}; use result::Result::{Ok, Err}; use sync::atomic; /// A wrapper for a path to temporary directory implementing automatic /// scope-based deletion. /// /// # Examples /// /// ```no_run /// use std::io::TempDir; /// /// { /// // create a temporary directory /// let tmpdir = match TempDir::new("mysuffix") { /// Ok(dir) => dir, /// Err(e) => panic!("couldn't create temporary directory: {}", e) /// }; /// /// // get the path of the temporary directory without affecting the wrapper /// let tmppath = tmpdir.path(); /// /// println!("The path of temporary directory is {}", tmppath.display()); /// /// // the temporary directory is automatically removed when tmpdir goes /// // out of scope at the end of the block /// } /// { /// // create a temporary directory, this time using a custom path /// let tmpdir = match TempDir::new_in(&Path::new("/tmp/best/custom/path"), "mysuffix") { /// Ok(dir) => dir, /// Err(e) => panic!("couldn't create temporary directory: {}", e) /// }; /// /// // get the path of the temporary directory and disable automatic deletion in the wrapper /// let tmppath = tmpdir.into_inner(); /// /// println!("The path of the not-so-temporary directory is {}", tmppath.display()); /// /// // the temporary directory is not removed here /// // because the directory is detached from the wrapper /// } /// { /// // create a temporary directory /// let tmpdir = match TempDir::new("mysuffix") { /// Ok(dir) => dir, /// Err(e) => panic!("couldn't create temporary directory: {}", e) /// }; /// /// // close the temporary directory manually and check the result /// match tmpdir.close() { /// Ok(_) => println!("success!"), /// Err(e) => panic!("couldn't remove temporary directory: {}", e) /// }; /// } /// ``` pub struct TempDir { path: Option<Path>, disarmed: bool } impl TempDir { /// Attempts to make a temporary directory inside of `tmpdir` whose name /// will have the suffix `suffix`. The directory will be automatically /// deleted once the returned wrapper is destroyed. /// /// If no directory can be created, `Err` is returned. pub fn new_in(tmpdir: &Path, suffix: &str) -> IoResult<TempDir> { if !tmpdir.is_absolute() { let abs_tmpdir = try!(os::make_absolute(tmpdir)); return TempDir::new_in(&abs_tmpdir, suffix); } static CNT: atomic::AtomicUint = atomic::INIT_ATOMIC_UINT; let mut attempts = 0u; loop { let filename = format!("rs-{}-{}-{}", unsafe { libc::getpid() }, CNT.fetch_add(1, atomic::SeqCst), suffix); let p = tmpdir.join(filename); match fs::mkdir(&p, io::USER_RWX) { Err(error) => { if attempts >= 1000 { return Err(error) } attempts += 1; } Ok(()) => return Ok(TempDir { path: Some(p), disarmed: false }) } } } /// Attempts to make a temporary directory inside of `os::tmpdir()` whose /// name will have the suffix `suffix`. The directory will be automatically /// deleted once the returned wrapper is destroyed. /// /// If no directory can be created, `Err` is returned. pub fn new(suffix: &str) -> IoResult<TempDir> { TempDir::new_in(&os::tmpdir(), suffix) } /// Unwrap the wrapped `std::path::Path` from the `TempDir` wrapper. /// This discards the wrapper so that the automatic deletion of the /// temporary directory is prevented. pub fn into_inner(self) -> Path { let mut tmpdir = self; tmpdir.path.take().unwrap() } /// Deprecated, use into_inner() instead #[deprecated = "renamed to into_inner()"] pub fn unwrap(self) -> Path { self.into_inner() } /// Access the wrapped `std::path::Path` to the temporary directory. pub fn path<'a>(&'a self) -> &'a Path { self.path.as_ref().unwrap() } /// Close and remove the temporary directory /// /// Although `TempDir` removes the directory on drop, in the destructor /// any errors are ignored. To detect errors cleaning up the temporary /// directory, call `close` instead. pub fn close(mut self) -> IoResult<()> { self.cleanup_dir() } fn cleanup_dir(&mut self) -> IoResult<()> { assert!(!self.disarmed); self.disarmed = true; match self.path { Some(ref p) => { fs::rmdir_recursive(p) } None => Ok(()) } } } impl Drop for TempDir { fn drop(&mut self) { if !self.disarmed { let _ = self.cleanup_dir(); } } } // the tests for this module need to change the path using change_dir, // and this doesn't play nicely with other tests so these unit tests are located // in src/test/run-pass/tempfile.rs