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Merge pull request #100894 from clickyotomy/sk/loop-dev-sysfs

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Handle invalid `losetup' options
This commit is contained in:
Kubernetes Prow Robot 2021-05-12 05:05:39 -07:00 committed by GitHub
commit 6768ac8115
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2 changed files with 64 additions and 75 deletions
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53
pkg/volume/storageos/storageos_util.go
View File

@ -19,6 +19,7 @@ package storageos
import (
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
@ -346,7 +347,7 @@ func pathDeviceType(path string) (deviceType, error) {
// attachFileDevice takes a path to a regular file and makes it available as an
// attached block device.
func attachFileDevice(path string, exec utilexec.Interface) (string, error) {
blockDevicePath, err := getLoopDevice(path, exec)
blockDevicePath, err := getLoopDevice(path)
if err != nil && err.Error() != ErrDeviceNotFound {
return "", err
}
@ -363,7 +364,7 @@ func attachFileDevice(path string, exec utilexec.Interface) (string, error) {
}
// Returns the full path to the loop device associated with the given path.
func getLoopDevice(path string, exec utilexec.Interface) (string, error) {
func getLoopDevice(path string) (string, error) {
_, err := os.Stat(path)
if os.IsNotExist(err) {
return "", errors.New(ErrNotAvailable)
@ -372,23 +373,18 @@ func getLoopDevice(path string, exec utilexec.Interface) (string, error) {
return "", fmt.Errorf("not attachable: %v", err)
}
args := []string{"-j", path}
out, err := exec.Command(losetupPath, args...).CombinedOutput()
if err != nil {
klog.V(2).Infof("Failed device discover command for path %s: %v", path, err)
return "", err
}
return parseLosetupOutputForDevice(out)
return getLoopDeviceFromSysfs(path)
}
func makeLoopDevice(path string, exec utilexec.Interface) (string, error) {
args := []string{"-f", "-P", "--show", path}
args := []string{"-f", "-P", path}
out, err := exec.Command(losetupPath, args...).CombinedOutput()
if err != nil {
klog.V(2).Infof("Failed device create command for path %s: %v", path, err)
klog.V(2).Infof("Failed device create command for path %s: %v %s", path, err, out)
return "", err
}
return parseLosetupOutputForDevice(out)
return getLoopDeviceFromSysfs(path)
}
func removeLoopDevice(device string, exec utilexec.Interface) error {
@ -406,16 +402,35 @@ func isLoopDevice(device string) bool {
return strings.HasPrefix(device, "/dev/loop")
}
func parseLosetupOutputForDevice(output []byte) (string, error) {
if len(output) == 0 {
// getLoopDeviceFromSysfs finds the backing file for a loop
// device from sysfs via "/sys/block/loop*/loop/backing_file".
func getLoopDeviceFromSysfs(path string) (string, error) {
// If the file is a symlink.
realPath, err := filepath.EvalSymlinks(path)
if err != nil {
return "", errors.New(ErrDeviceNotFound)
}
// losetup returns device in the format:
// /dev/loop1: [0073]:148662 (/var/lib/storageos/volumes/308f14af-cf0a-08ff-c9c3-b48104318e05)
device := strings.TrimSpace(strings.SplitN(string(output), ":", 2)[0])
if len(device) == 0 {
devices, err := filepath.Glob("/sys/block/loop*")
if err != nil {
return "", errors.New(ErrDeviceNotFound)
}
return device, nil
for _, device := range devices {
backingFile := fmt.Sprintf("%s/loop/backing_file", device)
// The contents of this file is the absolute path of "path".
data, err := ioutil.ReadFile(backingFile)
if err != nil {
continue
}
// Return the first match.
backingFilePath := strings.TrimSpace(string(data))
if backingFilePath == path || backingFilePath == realPath {
return fmt.Sprintf("/dev/%s", filepath.Base(device)), nil
}
}
return "", errors.New(ErrDeviceNotFound)
}

86
pkg/volume/util/volumepathhandler/volume_path_handler_linux.go
View File

@ -19,9 +19,9 @@ limitations under the License.
package volumepathhandler
import (
"bufio"
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
@ -83,32 +83,20 @@ func (v VolumePathHandler) GetLoopDevice(path string) (string, error) {
return "", fmt.Errorf("not attachable: %v", err)
}
args := []string{"-j", path}
cmd := exec.Command(losetupPath, args...)
out, err := cmd.CombinedOutput()
if err != nil {
klog.V(2).Infof("Failed device discover command for path %s: %v %s", path, err, out)
return "", fmt.Errorf("losetup -j %s failed: %v", path, err)
}
return parseLosetupOutputForDevice(out, path)
return getLoopDeviceFromSysfs(path)
}
func makeLoopDevice(path string) (string, error) {
args := []string{"-f", "--show", path}
args := []string{"-f", path}
cmd := exec.Command(losetupPath, args...)
out, err := cmd.CombinedOutput()
if err != nil {
klog.V(2).Infof("Failed device create command for path: %s %v %s ", path, err, out)
return "", fmt.Errorf("losetup -f --show %s failed: %v", path, err)
klog.V(2).Infof("Failed device create command for path: %s %v %s", path, err, out)
return "", fmt.Errorf("losetup %s failed: %v", strings.Join(args, " "), err)
}
// losetup -f --show {path} returns device in the format:
// /dev/loop1
if len(out) == 0 {
return "", errors.New(ErrDeviceNotFound)
}
return strings.TrimSpace(string(out)), nil
return getLoopDeviceFromSysfs(path)
}
// removeLoopDevice removes specified loopback device
@ -126,51 +114,37 @@ func removeLoopDevice(device string) error {
return nil
}
func parseLosetupOutputForDevice(output []byte, path string) (string, error) {
if len(output) == 0 {
return "", errors.New(ErrDeviceNotFound)
}
// getLoopDeviceFromSysfs finds the backing file for a loop
// device from sysfs via "/sys/block/loop*/loop/backing_file".
func getLoopDeviceFromSysfs(path string) (string, error) {
// If the file is a symlink.
realPath, err := filepath.EvalSymlinks(path)
if err != nil {
return "", fmt.Errorf("failed to evaluate path %s: %s", path, err)
}
// losetup -j {path} returns device in the format:
// /dev/loop1: [0073]:148662 ({path})
// /dev/loop2: [0073]:148662 (/dev/sdX)
//
// losetup -j shows all the loop device for the same device that has the same
// major/minor number, by resolving symlink and matching major/minor number.
// Therefore, there will be other path than {path} in output, as shown in above output.
s := string(output)
// Find the line that exact matches to the path, or "({path})"
var matched string
scanner := bufio.NewScanner(strings.NewReader(s))
for scanner.Scan() {
// losetup output has symlinks expanded
if strings.HasSuffix(scanner.Text(), "("+realPath+")") {
matched = scanner.Text()
break
}
// Just in case losetup changes, check for the original path too
if strings.HasSuffix(scanner.Text(), "("+path+")") {
matched = scanner.Text()
break
}
devices, err := filepath.Glob("/sys/block/loop*")
if err != nil {
return "", fmt.Errorf("failed to list loop devices in sysfs: %s", err)
}
if len(matched) == 0 {
return "", errors.New(ErrDeviceNotFound)
}
s = matched
// Get device name, or the 0th field of the output separated with ":".
// We don't need 1st field or later to be splitted, so passing 2 to SplitN.
device := strings.TrimSpace(strings.SplitN(s, ":", 2)[0])
if len(device) == 0 {
return "", errors.New(ErrDeviceNotFound)
for _, device := range devices {
backingFile := fmt.Sprintf("%s/loop/backing_file", device)
// The contents of this file is the absolute path of "path".
data, err := ioutil.ReadFile(backingFile)
if err != nil {
continue
}
// Return the first match.
backingFilePath := strings.TrimSpace(string(data))
if backingFilePath == path || backingFilePath == realPath {
return fmt.Sprintf("/dev/%s", filepath.Base(device)), nil
}
}
return device, nil
return "", errors.New(ErrDeviceNotFound)
}
// FindGlobalMapPathUUIDFromPod finds {pod uuid} bind mount under globalMapPath