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windows: don't fail when concurrent threads/processes fail to rename …
…file On Windows, it seems that you can't rename a file if the target file is open (Stebalien/tempfile#131). I think that's the reason for our failing tests on Windows. This patch adds a simple wrapper around `NamedTempFile::persist()` that returns the existing file instead of failing, if there is one.
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// Copyright 2021 Google LLC | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// https://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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use std::fs::File; | ||
use std::path::Path; | ||
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use tempfile::{NamedTempFile, PersistError}; | ||
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// Like NamedTempFile::persist(), but also succeeds if the target already | ||
// exists. | ||
pub fn persist_temp_file<P: AsRef<Path>>( | ||
temp_file: NamedTempFile, | ||
new_path: P, | ||
) -> Result<File, PersistError> { | ||
match temp_file.persist(&new_path) { | ||
Ok(file) => Ok(file), | ||
Err(PersistError { error, file }) => { | ||
if let Ok(existing_file) = File::open(new_path) { | ||
Ok(existing_file) | ||
} else { | ||
Err(PersistError { error, file }) | ||
} | ||
} | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
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use std::env::temp_dir; | ||
use std::io::Write; | ||
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use test_case::test_case; | ||
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use super::*; | ||
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#[test] | ||
fn test_persist_no_existing_file() { | ||
let temp_dir = temp_dir(); | ||
let target = temp_dir.join("file"); | ||
let mut temp_file = NamedTempFile::new_in(&temp_dir).unwrap(); | ||
temp_file.write_all(b"contents").unwrap(); | ||
assert!(persist_temp_file(temp_file, &target).is_ok()); | ||
} | ||
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#[test_case(false ; "existing file open")] | ||
#[test_case(true ; "existing file closed")] | ||
fn test_persist_target_exists(existing_file_closed: bool) { | ||
let temp_dir = temp_dir(); | ||
let target = temp_dir.join("file"); | ||
let mut temp_file = NamedTempFile::new_in(&temp_dir).unwrap(); | ||
temp_file.write_all(b"contents").unwrap(); | ||
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let mut file = File::create(&target).unwrap(); | ||
file.write_all(b"contents").unwrap(); | ||
if existing_file_closed { | ||
drop(file); | ||
} | ||
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assert!(persist_temp_file(temp_file, &target).is_ok()); | ||
} | ||
} |
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