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40 lines
851 B
Go
40 lines
851 B
Go
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// Copyright 2012, Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ioutil2
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import (
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"io"
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"io/ioutil"
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"os"
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"path"
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)
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// Write file to temp and atomically move when everything else succeeds.
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func WriteFileAtomic(filename string, data []byte, perm os.FileMode) error {
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dir, name := path.Dir(filename), path.Base(filename)
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f, err := ioutil.TempFile(dir, name)
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if err != nil {
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return err
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}
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n, err := f.Write(data)
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f.Close()
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if err == nil && n < len(data) {
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err = io.ErrShortWrite
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} else {
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err = os.Chmod(f.Name(), perm)
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}
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if err != nil {
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os.Remove(f.Name())
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return err
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}
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return os.Rename(f.Name(), filename)
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}
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// Check file exists or not
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func FileExists(name string) bool {
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_, err := os.Stat(name)
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return !os.IsNotExist(err)
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}
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