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// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use std::env::{current_exe, temp_dir};
use std::fs::{create_dir_all, remove_dir_all};
use std::ops::Deref;
use std::path::{Path, PathBuf};
use std::thread::panicking;
use super::linux::{getpid, gettid};
/// Returns a stable path based on the label, pid, and tid. If the label isn't provided the
/// current_exe is used instead.
pub fn get_temp_path(label: Option<&str>) -> PathBuf {
if let Some(label) = label {
temp_dir().join(format!("{}-{}-{}", label, getpid(), gettid()))
} else {
get_temp_path(Some(current_exe().unwrap().to_str().unwrap()))
}
}
/// Automatically deletes the path it contains when it goes out of scope unless it is a test and
/// drop is called after a panic!.
///
/// This is particularly useful for creating temporary directories for use with tests.
pub struct ScopedPath<P: AsRef<Path>>(P);
impl<P: AsRef<Path>> ScopedPath<P> {
pub fn create(p: P) -> Result<Self, std::io::Error> {
create_dir_all(p.as_ref())?;
Ok(ScopedPath(p))
}
}
impl<P: AsRef<Path>> AsRef<Path> for ScopedPath<P> {
fn as_ref(&self) -> &Path {
self.0.as_ref()
}
}
impl<P: AsRef<Path>> Deref for ScopedPath<P> {
type Target = Path;
fn deref(&self) -> &Self::Target {
self.0.as_ref()
}
}
impl<P: AsRef<Path>> Drop for ScopedPath<P> {
fn drop(&mut self) {
// Leave the files on a failed test run for debugging.
if panicking() && cfg!(test) {
eprintln!("NOTE: Not removing {}", self.display());
return;
}
if let Err(e) = remove_dir_all(&**self) {
eprintln!("Failed to remove {}: {}", self.display(), e);
}
}
}
#[cfg(test)]
pub(crate) mod tests {
use super::*;
use std::panic::catch_unwind;
#[test]
fn gettemppath() {
assert_ne!("", get_temp_path(None).to_string_lossy());
assert_eq!(
get_temp_path(None),
get_temp_path(Some(current_exe().unwrap().to_str().unwrap()))
);
assert_ne!(
get_temp_path(Some("label")),
get_temp_path(Some(current_exe().unwrap().to_str().unwrap()))
);
}
#[test]
fn scopedpath_exists() {
let tmp_path = get_temp_path(None);
{
let scoped_path = ScopedPath::create(&tmp_path).unwrap();
assert!(scoped_path.exists());
}
assert!(!tmp_path.exists());
}
#[test]
fn scopedpath_notexists() {
let tmp_path = get_temp_path(None);
{
let _scoped_path = ScopedPath(&tmp_path);
}
assert!(!tmp_path.exists());
}
#[test]
fn scopedpath_panic() {
let tmp_path = get_temp_path(None);
assert!(catch_unwind(|| {
{
let scoped_path = ScopedPath::create(&tmp_path).unwrap();
assert!(scoped_path.exists());
panic!()
}
})
.is_err());
assert!(tmp_path.exists());
remove_dir_all(&tmp_path).unwrap();
}
}
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