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ioutil.go
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ioutil.go
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/*
Copyright 2017 Google Inc.
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
http://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.
*/
// Package ioutil2 provides extra functionality along similar lines to io/ioutil.
package ioutil2
import (
"io/ioutil"
"os"
"path"
)
// WriteFileAtomic writes the data to a temp file and atomically move if everything else succeeds.
func WriteFileAtomic(filename string, data []byte, perm os.FileMode) error {
dir, name := path.Split(filename)
f, err := ioutil.TempFile(dir, name)
if err != nil {
return err
}
_, err = f.Write(data)
if err == nil {
err = f.Sync()
}
if closeErr := f.Close(); err == nil {
err = closeErr
}
if permErr := os.Chmod(f.Name(), perm); err == nil {
err = permErr
}
if err == nil {
err = os.Rename(f.Name(), filename)
}
// Any err should result in full cleanup.
if err != nil {
os.Remove(f.Name())
}
return err
}