1// +build !windows
2
3/*
4   Copyright The containerd Authors.
5
6   Licensed under the Apache License, Version 2.0 (the "License");
7   you may not use this file except in compliance with the License.
8   You may obtain a copy of the License at
9
10       http://www.apache.org/licenses/LICENSE-2.0
11
12   Unless required by applicable law or agreed to in writing, software
13   distributed under the License is distributed on an "AS IS" BASIS,
14   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   See the License for the specific language governing permissions and
16   limitations under the License.
17*/
18
19package os
20
21import (
22	"github.com/containerd/containerd/mount"
23	"golang.org/x/sys/unix"
24)
25
26// UNIX collects unix system level operations that need to be
27// mocked out during tests.
28type UNIX interface {
29	Mount(source string, target string, fstype string, flags uintptr, data string) error
30	Unmount(target string) error
31	LookupMount(path string) (mount.Info, error)
32}
33
34// Mount will call unix.Mount to mount the file.
35func (RealOS) Mount(source string, target string, fstype string, flags uintptr, data string) error {
36	return unix.Mount(source, target, fstype, flags, data)
37}
38
39// Unmount will call Unmount to unmount the file.
40func (RealOS) Unmount(target string) error {
41	return Unmount(target)
42}
43
44// LookupMount gets mount info of a given path.
45func (RealOS) LookupMount(path string) (mount.Info, error) {
46	return mount.Lookup(path)
47}
48
49// Unmount unmounts the target. It does not return an error in case the target is not mounted.
50// In case the target does not exist, the appropriate error is returned.
51func Unmount(target string) error {
52	err := unix.Unmount(target, unix.MNT_DETACH)
53	if err == unix.EINVAL {
54		// ignore "not mounted" error
55		err = nil
56	}
57
58	return err
59}
60