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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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842515c2f1
Since the top-level Cargo.toml specifies a vmm-sys-util revision but not the sub crates, Cargo.lock points at 2 different crates. cargo vendor copies both of them into the vendor directory but forces the build to use the one coming from the top level driven requirement. Although this is a waste of space, this is a cargo vendor limitation that we have to live with for now. Also, because the dependency onto linux-loader had to be updated, we had to specify a newly introduced feature called "elf". Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
105 lines
3.2 KiB
Rust
105 lines
3.2 KiB
Rust
// Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE-BSD-3-Clause file.
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//
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// SPDX-License-Identifier: BSD-3-Clause
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use std::ffi::CString;
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use std::ffi::OsStr;
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use std::ffi::OsString;
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use std::fs;
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use std::os::unix::ffi::OsStringExt;
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use std::path::Path;
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use std::path::PathBuf;
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use libc;
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use crate::{errno_result, Result};
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/// Create and remove a temporary directory. The directory will be maintained for the lifetime of
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/// the `TempDir` object.
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pub struct TempDir {
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path: Option<PathBuf>,
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}
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impl TempDir {
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/// Creates a new tempory directory.
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/// The directory will be removed when the object goes out of scope.
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///
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/// # Examples
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///
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/// ```
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/// # use std::path::Path;
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/// # use std::path::PathBuf;
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/// # use vmm_sys_util::TempDir;
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/// # fn test_create_temp_dir() -> Result<(), ()> {
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/// let t = TempDir::new("/tmp/testdir").map_err(|_| ())?;
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/// assert!(t.as_path().unwrap().exists());
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/// # Ok(())
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/// # }
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/// ```
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pub fn new<P: AsRef<OsStr>>(prefix: P) -> Result<TempDir> {
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let mut dir_string = prefix.as_ref().to_os_string();
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dir_string.push("XXXXXX");
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// unwrap this result as the internal bytes can't have a null with a valid path.
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let dir_name = CString::new(dir_string.into_vec()).unwrap();
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let mut dir_bytes = dir_name.into_bytes_with_nul();
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let ret = unsafe {
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// Creating the directory isn't unsafe. The fact that it modifies the guts of the path
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// is also OK because it only overwrites the last 6 Xs added above.
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libc::mkdtemp(dir_bytes.as_mut_ptr() as *mut libc::c_char)
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};
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if ret.is_null() {
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return errno_result();
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}
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dir_bytes.pop(); // Remove the null becasue from_vec can't handle it.
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Ok(TempDir {
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path: Some(PathBuf::from(OsString::from_vec(dir_bytes))),
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})
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}
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/// Removes the temporary directory. Calling this is optional as dropping a `TempDir` object
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/// will also remove the directory. Calling remove explicitly allows for better error handling.
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pub fn remove(mut self) -> Result<()> {
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let path = self.path.take();
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path.map_or(Ok(()), fs::remove_dir_all)?;
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Ok(())
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}
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/// Returns the path to the tempdir if it is currently valid
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pub fn as_path(&self) -> Option<&Path> {
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self.path.as_ref().map(|ref p| p.as_path())
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}
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}
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impl Drop for TempDir {
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fn drop(&mut self) {
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if let Some(ref p) = self.path {
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// Nothing can be done here if this returns an error.
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let _ = fs::remove_dir_all(p);
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn create_dir() {
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let t = TempDir::new("/tmp/asdf").unwrap();
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let path = t.as_path().unwrap();
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assert!(path.exists());
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assert!(path.is_dir());
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assert!(path.starts_with("/tmp/"));
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}
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#[test]
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fn remove_dir() {
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let t = TempDir::new("/tmp/asdf").unwrap();
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let path = t.as_path().unwrap().to_owned();
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assert!(t.remove().is_ok());
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assert!(!path.exists());
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}
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}
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