lock_linux.go

//  Copyright 2019 Google Inc. All Rights Reserved.
//
//  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 main

import (
	"os"
	"syscall"

	"github.com/google/googet/v2/settings"
)

func lock(f *os.File) (func(), error) {
	if err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX); err != nil {
		return nil, err
	}
	return func() {
		syscall.Flock(int(f.Fd()), syscall.LOCK_UN)
		f.Close()
		os.Remove(settings.LockFile())
	}, nil
}