1// Copyright 2020 Google LLC 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// https://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package mount 16 17import ( 18 "bufio" 19 "io" 20 "os" 21 "strings" 22 "syscall" 23) 24 25type systemMounter struct { 26} 27 28func NewSystemMounter() *systemMounter { 29 var f systemMounter 30 return &f 31} 32 33func (f *systemMounter) Mount(source string, target string, fstype string, flags uintptr, data string) error { 34 return syscall.Mount(source, target, fstype, flags, data) 35} 36 37func (f *systemMounter) Unmount(target string, flags int) error { 38 return syscall.Unmount(target, flags) 39} 40 41func (f *systemMounter) List() ([]string, error) { 42 mountsFile, err := os.Open("/proc/mounts") 43 if err != nil { 44 return nil, err 45 } 46 defer mountsFile.Close() 47 mounts, err := f.parseMounts(mountsFile) 48 if err != nil { 49 return nil, err 50 } 51 var mountList []string 52 for _, mount := range mounts { 53 mountList = append(mountList, mount.Path) 54 } 55 return mountList, err 56} 57 58type Mount struct { 59 Device string 60 Path string 61 Type string 62 Opts string 63} 64 65func (f *systemMounter) parseMounts(mountSource io.Reader) ([]Mount, error) { 66 var mounts []Mount 67 scanner := bufio.NewScanner(mountSource) 68 for scanner.Scan() { 69 line := scanner.Text() 70 fields := strings.Fields(line) 71 mount := Mount{ 72 Device: fields[0], 73 Path: fields[1], 74 Type: fields[2], 75 Opts: fields[3], 76 } 77 mounts = append(mounts, mount) 78 } 79 return mounts, scanner.Err() 80} 81