minio/pkg/mountinfo/mountinfo_linux_test.go

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// +build linux
/*
* MinIO Cloud Storage, (C) 2017 MinIO, Inc.
*
* 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 mountinfo
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"testing"
)
// Tests cross device mount verification function, for both failure
// and success cases.
func TestCrossDeviceMountPaths(t *testing.T) {
successCase :=
`/dev/0 /path/to/0/1 type0 flags 0 0
/dev/1 /path/to/1 type1 flags 1 1
/dev/2 /path/to/1/2 type2 flags,1,2=3 2 2
/dev/3 /path/to/1.1 type3 falgs,1,2=3 3 3
`
dir, err := ioutil.TempDir("", "TestReadProcmountInfos")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
mountsPath := filepath.Join(dir, "mounts")
if err = ioutil.WriteFile(mountsPath, []byte(successCase), 0666); err != nil {
t.Fatal(err)
}
// Failure case where we detected successfully cross device mounts.
{
var absPaths = []string{"/path/to/1"}
if err = checkCrossDevice(absPaths, mountsPath); err == nil {
t.Fatal("Expected to fail, but found success")
}
mp := []mountInfo{
{"/dev/2", "/path/to/1/2", "type2", []string{"flags"}, "2", "2"},
}
msg := fmt.Sprintf("Cross-device mounts detected on path (/path/to/1) at following locations %s. Export path should not have any sub-mounts, refusing to start.", mp)
if err.Error() != msg {
t.Fatalf("Expected msg %s, got %s", msg, err)
}
}
// Failure case when input path is not absolute.
{
var absPaths = []string{"."}
if err = checkCrossDevice(absPaths, mountsPath); err == nil {
t.Fatal("Expected to fail for non absolute paths")
}
expectedErrMsg := fmt.Sprintf("Invalid argument, path (%s) is expected to be absolute", ".")
if err.Error() != expectedErrMsg {
t.Fatalf("Expected %s, got %s", expectedErrMsg, err)
}
}
// Success case, where path doesn't have any mounts.
{
var absPaths = []string{"/path/to/x"}
if err = checkCrossDevice(absPaths, mountsPath); err != nil {
t.Fatalf("Expected success, failed instead (%s)", err)
}
}
}
// Tests cross device mount verification function, for both failure
// and success cases.
func TestCrossDeviceMount(t *testing.T) {
successCase :=
`/dev/0 /path/to/0/1 type0 flags 0 0
/dev/1 /path/to/1 type1 flags 1 1
/dev/2 /path/to/1/2 type2 flags,1,2=3 2 2
/dev/3 /path/to/1.1 type3 falgs,1,2=3 3 3
`
dir, err := ioutil.TempDir("", "TestReadProcmountInfos")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
mountsPath := filepath.Join(dir, "mounts")
if err = ioutil.WriteFile(mountsPath, []byte(successCase), 0666); err != nil {
t.Fatal(err)
}
mounts, err := readProcMounts(mountsPath)
if err != nil {
t.Fatal(err)
}
// Failure case where we detected successfully cross device mounts.
{
if err = mounts.checkCrossMounts("/path/to/1"); err == nil {
t.Fatal("Expected to fail, but found success")
}
mp := []mountInfo{
{"/dev/2", "/path/to/1/2", "type2", []string{"flags"}, "2", "2"},
}
msg := fmt.Sprintf("Cross-device mounts detected on path (/path/to/1) at following locations %s. Export path should not have any sub-mounts, refusing to start.", mp)
if err.Error() != msg {
t.Fatalf("Expected msg %s, got %s", msg, err)
}
}
// Failure case when input path is not absolute.
{
if err = mounts.checkCrossMounts("."); err == nil {
t.Fatal("Expected to fail for non absolute paths")
}
expectedErrMsg := fmt.Sprintf("Invalid argument, path (%s) is expected to be absolute", ".")
if err.Error() != expectedErrMsg {
t.Fatalf("Expected %s, got %s", expectedErrMsg, err)
}
}
// Success case, where path doesn't have any mounts.
{
if err = mounts.checkCrossMounts("/path/to/x"); err != nil {
t.Fatalf("Expected success, failed instead (%s)", err)
}
}
}
// Tests read proc mounts file.
func TestReadProcmountInfos(t *testing.T) {
successCase :=
`/dev/0 /path/to/0 type0 flags 0 0
/dev/1 /path/to/1 type1 flags 1 1
/dev/2 /path/to/2 type2 flags,1,2=3 2 2
`
dir, err := ioutil.TempDir("", "TestReadProcmountInfos")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
mountsPath := filepath.Join(dir, "mounts")
if err = ioutil.WriteFile(mountsPath, []byte(successCase), 0666); err != nil {
t.Fatal(err)
}
// Verifies if reading each line worked properly.
{
var mounts mountInfos
mounts, err = readProcMounts(mountsPath)
if err != nil {
t.Fatal(err)
}
if len(mounts) != 3 {
t.Fatalf("expected 3 mounts, got %d", len(mounts))
}
mp := mountInfo{"/dev/0", "/path/to/0", "type0", []string{"flags"}, "0", "0"}
if !mountPointsEqual(mounts[0], mp) {
t.Errorf("got unexpected MountPoint[0]: %#v", mounts[0])
}
mp = mountInfo{"/dev/1", "/path/to/1", "type1", []string{"flags"}, "1", "1"}
if !mountPointsEqual(mounts[1], mp) {
t.Errorf("got unexpected mountInfo[1]: %#v", mounts[1])
}
mp = mountInfo{"/dev/2", "/path/to/2", "type2", []string{"flags", "1", "2=3"}, "2", "2"}
if !mountPointsEqual(mounts[2], mp) {
t.Errorf("got unexpected mountInfo[2]: %#v", mounts[2])
}
}
// Failure case mounts path doesn't exist, if not fail.
{
if _, err = readProcMounts(filepath.Join(dir, "non-existent")); err != nil && !os.IsNotExist(err) {
t.Fatal(err)
}
}
}
// Tests read proc mounts reader.
func TestReadProcMountFrom(t *testing.T) {
successCase :=
`/dev/0 /path/to/0 type0 flags 0 0
/dev/1 /path/to/1 type1 flags 1 1
/dev/2 /path/to/2 type2 flags,1,2=3 2 2
`
// Success case, verifies if parsing works properly.
{
mounts, err := parseMountFrom(strings.NewReader(successCase))
if err != nil {
t.Errorf("expected success")
}
if len(mounts) != 3 {
t.Fatalf("expected 3 mounts, got %d", len(mounts))
}
mp := mountInfo{"/dev/0", "/path/to/0", "type0", []string{"flags"}, "0", "0"}
if !mountPointsEqual(mounts[0], mp) {
t.Errorf("got unexpected mountInfo[0]: %#v", mounts[0])
}
mp = mountInfo{"/dev/1", "/path/to/1", "type1", []string{"flags"}, "1", "1"}
if !mountPointsEqual(mounts[1], mp) {
t.Errorf("got unexpected mountInfo[1]: %#v", mounts[1])
}
mp = mountInfo{"/dev/2", "/path/to/2", "type2", []string{"flags", "1", "2=3"}, "2", "2"}
if !mountPointsEqual(mounts[2], mp) {
t.Errorf("got unexpected mountInfo[2]: %#v", mounts[2])
}
}
// Error cases where parsing fails with invalid Freq and Pass params.
{
errorCases := []string{
"/dev/0 /path/to/mount\n",
"/dev/1 /path/to/mount type flags a 0\n",
"/dev/2 /path/to/mount type flags 0 b\n",
}
for _, ec := range errorCases {
_, rerr := parseMountFrom(strings.NewReader(ec))
if rerr == nil {
t.Errorf("expected error")
}
}
}
}
// Helpers for tests.
// Check if two `mountInfo` are equal.
func mountPointsEqual(a, b mountInfo) bool {
if a.Device != b.Device || a.Path != b.Path || a.FSType != b.FSType || !slicesEqual(a.Options, b.Options) || a.Pass != b.Pass || a.Freq != b.Freq {
return false
}
return true
}
// Checks if two string slices are equal.
func slicesEqual(a, b []string) bool {
if len(a) != len(b) {
return false
}
for i := range a {
if a[i] != b[i] {
return false
}
}
return true
}