61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
// Copyright 2015 CNI authors
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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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package disk
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import (
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"os"
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"path"
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"github.com/alexflint/go-filemutex"
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)
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// FileLock wraps os.File to be used as a lock using flock
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type FileLock struct {
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f *filemutex.FileMutex
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}
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// NewFileLock opens file/dir at path and returns unlocked FileLock object
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func NewFileLock(lockPath string) (*FileLock, error) {
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fi, err := os.Stat(lockPath)
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if err != nil {
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return nil, err
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}
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if fi.IsDir() {
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lockPath = path.Join(lockPath, "lock")
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}
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f, err := filemutex.New(lockPath)
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if err != nil {
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return nil, err
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}
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return &FileLock{f}, nil
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}
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func (l *FileLock) Close() error {
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return l.f.Close()
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}
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// Lock acquires an exclusive lock
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func (l *FileLock) Lock() error {
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return l.f.Lock()
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}
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// Unlock releases the lock
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func (l *FileLock) Unlock() error {
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return l.f.Unlock()
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}
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