syscall.go

//
// Copyright 2015 The rkt Authors
// Copyright (c) 2016 Intel Corporation
//
// 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 virtcontainers

import (
	"fmt"
	"os"
	"path/filepath"
)

// ensureDestinationExists will recursively create a given mountpoint. If directories
// are created, their permissions are initialized to mountPerm
func ensureDestinationExists(source, destination string) error {
	fileInfo, err := os.Stat(source)
	if err != nil {
		return fmt.Errorf("could not stat source location %v: %v", source, err)
	}

	targetPathParent, _ := filepath.Split(destination)
	if err := os.MkdirAll(targetPathParent, mountPerm); err != nil {
		return fmt.Errorf("could not create parent directory %v: %v", targetPathParent, err)
	}

	if fileInfo.IsDir() {
		if err := os.Mkdir(destination, mountPerm); !os.IsExist(err) {
			return err
		}
	} else {
		file, err := os.OpenFile(destination, os.O_CREATE, mountPerm)
		if err != nil {
			return err
		}

		file.Close()
	}
	return nil
}