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// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package storage
import (
"os"
"path/filepath"
)
type plan9FileLock struct {
f *os.File
}
func (fl *plan9FileLock) release() error {
return fl.f.Close()
}
func newFileLock(path string, readOnly bool) (fl fileLock, err error) {
var (
flag int
perm os.FileMode
)
if readOnly {
flag = os.O_RDONLY
} else {
flag = os.O_RDWR
perm = os.ModeExclusive
}
f, err := os.OpenFile(path, flag, perm)
if os.IsNotExist(err) {
f, err = os.OpenFile(path, flag|os.O_CREATE, perm|0644)
}
if err != nil {
return
}
fl = &plan9FileLock{f: f}
return
}
func rename(oldpath, newpath string) error {
if _, err := os.Stat(newpath); err == nil {
if err := os.Remove(newpath); err != nil {
return err
}
}
_, fname := filepath.Split(newpath)
return os.Rename(oldpath, fname)
}
func syncDir(name string) error {
f, err := os.Open(name)
if err != nil {
return err
}
defer f.Close()
if err := f.Sync(); err != nil {
return err
}
return nil
}
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