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77 lines
2.2 KiB
77 lines
2.2 KiB
/*
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* Minio Client (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// NOTE - Rename() not guaranteed to be atomic on all filesystems which are not fully POSIX compatible
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// Package atomic provides atomic file write semantics by leveraging Rename's() atomicity.
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package atomic
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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)
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// File container provided for atomic file writes
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type File struct {
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*os.File
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file string
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}
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// Close the file replacing, returns an error if any
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func (f *File) Close() error {
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// close the embedded fd
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if err := f.File.Close(); err != nil {
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return err
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}
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// atomic rename to final destination
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if err := os.Rename(f.Name(), f.file); err != nil {
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return err
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}
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return nil
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}
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// CloseAndPurge removes the temp file, closes the transaction and returns an error if any
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func (f *File) CloseAndPurge() error {
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// close the embedded fd
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if err := f.File.Close(); err != nil {
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return err
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}
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if err := os.Remove(f.Name()); err != nil {
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return err
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}
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return nil
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}
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// FileCreate creates a new file at filePath for atomic writes, it also creates parent directories if they don't exist
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func FileCreate(filePath string) (*File, error) {
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// if parent directories do not exist, ioutil.TempFile doesn't create them
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// handle such a case with os.MkdirAll()
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if err := os.MkdirAll(filepath.Dir(filePath), 0700); err != nil {
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return nil, err
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}
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f, err := ioutil.TempFile(filepath.Dir(filePath), filepath.Base(filePath))
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if err != nil {
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return nil, err
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}
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if err := os.Chmod(f.Name(), 0600); err != nil {
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if err := os.Remove(f.Name()); err != nil {
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return nil, err
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}
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return nil, err
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}
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return &File{File: f, file: filePath}, nil
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}
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