forked from containers/build
/
mounts.go
67 lines (63 loc) · 1.41 KB
/
mounts.go
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// Copyright 2015 The appc Authors
//
// 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 util
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"syscall"
)
func IsMounted(path string) (bool, error) {
absPath, err := filepath.Abs(path)
if err != nil {
return false, err
}
file, err := ioutil.ReadFile("/proc/mounts")
if err != nil {
return false, err
}
lines := strings.Split(string(file), "\n")
for _, line := range lines {
tokens := strings.Split(line, " ")
if len(tokens) < 2 {
continue
}
if tokens[1] == absPath {
return true, nil
}
}
return false, nil
}
func MaybeUnmount(path string) error {
_, err := os.Stat(path)
switch {
case os.IsNotExist(err):
break
case err != nil:
return err
default:
mounted, err := IsMounted(path)
if err != nil {
return err
}
if mounted {
err = syscall.Unmount(path, 0)
if err != nil {
return err
}
}
}
return nil
}