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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package osutil
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"sort"
"strconv"
"strings"
)
func flattenMap(m map[string]string) string {
keys := make([]string, 0, len(m))
for key := range m {
keys = append(keys, key)
}
sort.Strings(keys)
var buf bytes.Buffer
for i, key := range keys {
if i > 0 {
buf.WriteRune(',')
}
if m[key] != "" {
fmt.Fprintf(&buf, "%s=%s", escape(key), escape(m[key]))
} else {
buf.WriteString(escape(key))
}
}
return buf.String()
}
func flattenList(l []string) string {
var buf bytes.Buffer
for i, item := range l {
if i > 0 {
buf.WriteRune(',')
}
buf.WriteString(escape(item))
}
return buf.String()
}
func (mi *MountInfoEntry) String() string {
maybeSpace := " "
if len(mi.OptionalFields) == 0 {
maybeSpace = ""
}
return fmt.Sprintf("%d %d %d:%d %s %s %s %s%s- %s %s %s",
mi.MountID, mi.ParentID, mi.DevMajor, mi.DevMinor, escape(mi.Root),
escape(mi.MountDir), flattenMap(mi.MountOptions), flattenList(mi.OptionalFields),
maybeSpace, escape(mi.FsType), escape(mi.MountSource),
flattenMap(mi.SuperOptions))
}
var openMountInfoFile = func() (io.ReadCloser, error) {
if IsTestBinary() {
panic("/proc/self/mountinfo must be mocked in tests")
}
return os.Open("/proc/self/mountinfo")
}
func mockMountInfo(mock func() (io.ReadCloser, error)) (restore func()) {
old := openMountInfoFile
openMountInfoFile = mock
return func() {
openMountInfoFile = old
}
}
// this should not be used except to test the actual implementation logic of
// LoadMountInfo, if you are trying to mock /proc/self/mountinfo in a test,
// use MockMountInfo(), which is exported and the right way to do that.
func MockProcSelfMountInfoLocation(filename string) (restore func()) {
return mockMountInfo(func() (io.ReadCloser, error) { return os.Open(filename) })
}
func MockMountInfo(content string) (restore func()) {
return mockMountInfo(func() (io.ReadCloser, error) { return ioutil.NopCloser(bytes.NewBufferString(content)), nil })
}
// LoadMountInfo loads list of mounted entries from /proc/self/mountinfo. This
// can be mocked by using osutil.MockMountInfo to hard-code a specific mountinfo
// file content to be loaded by this function
func LoadMountInfo() ([]*MountInfoEntry, error) {
f, err := openMountInfoFile()
if err != nil {
return nil, err
}
defer f.Close()
return ReadMountInfo(f)
}
// ReadMountInfo reads and parses a mountinfo file.
func ReadMountInfo(reader io.Reader) ([]*MountInfoEntry, error) {
scanner := bufio.NewScanner(reader)
var entries []*MountInfoEntry
for scanner.Scan() {
s := scanner.Text()
entry, err := ParseMountInfoEntry(s)
if err != nil {
return nil, err
}
entries = append(entries, entry)
}
if err := scanner.Err(); err != nil {
return nil, err
}
return entries, nil
}
// ParseMountInfoEntry parses a single line of /proc/$PID/mountinfo file.
func ParseMountInfoEntry(s string) (*MountInfoEntry, error) {
var e MountInfoEntry
var err error
fields := strings.FieldsFunc(s, func(r rune) bool { return r == ' ' })
// The format is variable-length, but at least 10 fields are mandatory.
// The (7) below is a list of optional field which is terminated with (8).
// 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
// (1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11)
if len(fields) < 10 {
return nil, fmt.Errorf("incorrect number of fields, expected at least 10 but found %d", len(fields))
}
// Parse MountID (decimal number).
e.MountID, err = strconv.Atoi(fields[0])
if err != nil {
return nil, fmt.Errorf("cannot parse mount ID: %q", fields[0])
}
// Parse ParentID (decimal number).
e.ParentID, err = strconv.Atoi(fields[1])
if err != nil {
return nil, fmt.Errorf("cannot parse parent mount ID: %q", fields[1])
}
// Parses DevMajor:DevMinor pair (decimal numbers separated by colon).
subFields := strings.FieldsFunc(fields[2], func(r rune) bool { return r == ':' })
if len(subFields) != 2 {
return nil, fmt.Errorf("cannot parse device major:minor number pair: %q", fields[2])
}
e.DevMajor, err = strconv.Atoi(subFields[0])
if err != nil {
return nil, fmt.Errorf("cannot parse device major number: %q", subFields[0])
}
e.DevMinor, err = strconv.Atoi(subFields[1])
if err != nil {
return nil, fmt.Errorf("cannot parse device minor number: %q", subFields[1])
}
// NOTE: All string fields use the same escape/unescape logic as fstab files.
// Parse Root, MountDir and MountOptions fields.
e.Root = unescape(fields[3])
e.MountDir = unescape(fields[4])
e.MountOptions = parseMountOpts(unescape(fields[5]))
// Optional fields are terminated with a "-" value and start
// after the mount options field. Skip ahead until we see the "-"
// marker.
var i int
for i = 6; i < len(fields) && fields[i] != "-"; i++ {
}
if i == len(fields) {
return nil, fmt.Errorf("list of optional fields is not terminated properly")
}
e.OptionalFields = fields[6:i]
for j := range e.OptionalFields {
e.OptionalFields[j] = unescape(e.OptionalFields[j])
}
// Parse the last three fixed fields.
tailFields := fields[i+1:]
if len(tailFields) != 3 {
return nil, fmt.Errorf("incorrect number of tail fields, expected 3 but found %d", len(tailFields))
}
e.FsType = unescape(tailFields[0])
e.MountSource = unescape(tailFields[1])
e.SuperOptions = parseMountOpts(unescape(tailFields[2]))
return &e, nil
}
func parseMountOpts(opts string) map[string]string {
result := make(map[string]string)
for _, opt := range strings.Split(opts, ",") {
keyValue := strings.SplitN(opt, "=", 2)
key := keyValue[0]
if len(keyValue) == 2 {
value := keyValue[1]
result[key] = value
} else {
result[key] = ""
}
}
return result
}
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