Update go dependencies

vendor/k8s.io/kubernetes/pkg/util/mount/BUILD

@@ -9,6 +9,7 @@ go_library(
         "exec_mount_unsupported.go",
         "fake.go",
         "mount.go",
+        "mount_helper.go",
         "mount_linux.go",
         "mount_unsupported.go",
         "mount_windows.go",
@@ -67,6 +68,7 @@ go_test(
     name = "go_default_test",
     srcs = [
         "exec_mount_test.go",
+        "mount_helper_test.go",
         "mount_linux_test.go",
         "mount_test.go",
         "mount_windows_test.go",

vendor/k8s.io/kubernetes/pkg/util/mount/fake.go

@@ -30,6 +30,8 @@ type FakeMounter struct {
 	MountPoints []MountPoint
 	Log         []FakeAction
 	Filesystem  map[string]FileType
+	// Error to return for a path when calling IsLikelyNotMountPoint
+	MountCheckErrors map[string]error
 	// Some tests run things in parallel, make sure the mounter does not produce
 	// any golang's DATA RACE warnings.
 	mutex sync.Mutex
@@ -119,6 +121,7 @@ func (f *FakeMounter) Unmount(target string) error {
 	}
 	f.MountPoints = newMountpoints
 	f.Log = append(f.Log, FakeAction{Action: FakeActionUnmount, Target: absTarget})
+	delete(f.MountCheckErrors, target)
 	return nil
 }
 
@@ -141,7 +144,12 @@ func (f *FakeMounter) IsLikelyNotMountPoint(file string) (bool, error) {
 	f.mutex.Lock()
 	defer f.mutex.Unlock()
 
-	_, err := os.Stat(file)
+	err := f.MountCheckErrors[file]
+	if err != nil {
+		return false, err
+	}
+
+	_, err = os.Stat(file)
 	if err != nil {
 		return true, err
 	}

vendor/k8s.io/kubernetes/pkg/util/mount/mount_helper.go

@@ -0,0 +1,124 @@
+/*
+Copyright 2018 The Kubernetes 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 mount
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+
+	"k8s.io/klog"
+)
+
+// CleanupMountPoint unmounts the given path and
+// deletes the remaining directory if successful.
+// if extensiveMountPointCheck is true
+// IsNotMountPoint will be called instead of IsLikelyNotMountPoint.
+// IsNotMountPoint is more expensive but properly handles bind mounts within the same fs.
+func CleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool) error {
+	// mounter.ExistsPath cannot be used because for containerized kubelet, we need to check
+	// the path in the kubelet container, not on the host.
+	pathExists, pathErr := PathExists(mountPath)
+	if !pathExists {
+		klog.Warningf("Warning: Unmount skipped because path does not exist: %v", mountPath)
+		return nil
+	}
+	corruptedMnt := IsCorruptedMnt(pathErr)
+	if pathErr != nil && !corruptedMnt {
+		return fmt.Errorf("Error checking path: %v", pathErr)
+	}
+	return doCleanupMountPoint(mountPath, mounter, extensiveMountPointCheck, corruptedMnt)
+}
+
+// doCleanupMountPoint unmounts the given path and
+// deletes the remaining directory if successful.
+// if extensiveMountPointCheck is true
+// IsNotMountPoint will be called instead of IsLikelyNotMountPoint.
+// IsNotMountPoint is more expensive but properly handles bind mounts within the same fs.
+// if corruptedMnt is true, it means that the mountPath is a corrupted mountpoint, and the mount point check
+// will be skipped
+func doCleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool, corruptedMnt bool) error {
+	if !corruptedMnt {
+		var notMnt bool
+		var err error
+		if extensiveMountPointCheck {
+			notMnt, err = IsNotMountPoint(mounter, mountPath)
+		} else {
+			notMnt, err = mounter.IsLikelyNotMountPoint(mountPath)
+		}
+
+		if err != nil {
+			return err
+		}
+
+		if notMnt {
+			klog.Warningf("Warning: %q is not a mountpoint, deleting", mountPath)
+			return os.Remove(mountPath)
+		}
+	}
+
+	// Unmount the mount path
+	klog.V(4).Infof("%q is a mountpoint, unmounting", mountPath)
+	if err := mounter.Unmount(mountPath); err != nil {
+		return err
+	}
+
+	notMnt, mntErr := mounter.IsLikelyNotMountPoint(mountPath)
+	if mntErr != nil {
+		return mntErr
+	}
+	if notMnt {
+		klog.V(4).Infof("%q is unmounted, deleting the directory", mountPath)
+		return os.Remove(mountPath)
+	}
+	return fmt.Errorf("Failed to unmount path %v", mountPath)
+}
+
+// TODO: clean this up to use pkg/util/file/FileExists
+// PathExists returns true if the specified path exists.
+func PathExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	} else if os.IsNotExist(err) {
+		return false, nil
+	} else if IsCorruptedMnt(err) {
+		return true, err
+	} else {
+		return false, err
+	}
+}
+
+// IsCorruptedMnt return true if err is about corrupted mount point
+func IsCorruptedMnt(err error) bool {
+	if err == nil {
+		return false
+	}
+	var underlyingError error
+	switch pe := err.(type) {
+	case nil:
+		return false
+	case *os.PathError:
+		underlyingError = pe.Err
+	case *os.LinkError:
+		underlyingError = pe.Err
+	case *os.SyscallError:
+		underlyingError = pe.Err
+	}
+
+	return underlyingError == syscall.ENOTCONN || underlyingError == syscall.ESTALE || underlyingError == syscall.EIO
+}

vendor/k8s.io/kubernetes/pkg/util/mount/mount_linux.go

@@ -55,6 +55,7 @@ const (
 	fsckErrorsUncorrected = 4
 
 	// place for subpath mounts
+	// TODO: pass in directory using kubelet_getters instead
 	containerSubPathDirectoryName = "volume-subpaths"
 	// syscall.Openat flags used to traverse directories not following symlinks
 	nofollowFlags = unix.O_RDONLY | unix.O_NOFOLLOW
@@ -890,15 +891,22 @@ func doCleanSubPaths(mounter Interface, podDir string, volumeName string) error
 
 		// scan /var/lib/kubelet/pods/<uid>/volume-subpaths/<volume>/<container name>/*
 		fullContainerDirPath := filepath.Join(subPathDir, containerDir.Name())
-		subPaths, err := ioutil.ReadDir(fullContainerDirPath)
-		if err != nil {
-			return fmt.Errorf("error reading %s: %s", fullContainerDirPath, err)
-		}
-		for _, subPath := range subPaths {
-			if err = doCleanSubPath(mounter, fullContainerDirPath, subPath.Name()); err != nil {
+		err = filepath.Walk(fullContainerDirPath, func(path string, info os.FileInfo, err error) error {
+			if path == fullContainerDirPath {
+				// Skip top level directory
+				return nil
+			}
+
+			// pass through errors and let doCleanSubPath handle them
+			if err = doCleanSubPath(mounter, fullContainerDirPath, filepath.Base(path)); err != nil {
 				return err
 			}
+			return nil
+		})
+		if err != nil {
+			return fmt.Errorf("error processing %s: %s", fullContainerDirPath, err)
 		}
+
 		// Whole container has been processed, remove its directory.
 		if err := os.Remove(fullContainerDirPath); err != nil {
 			return fmt.Errorf("error deleting %s: %s", fullContainerDirPath, err)
@@ -925,22 +933,12 @@ func doCleanSubPath(mounter Interface, fullContainerDirPath, subPathIndex string
 	// process /var/lib/kubelet/pods/<uid>/volume-subpaths/<volume>/<container name>/<subPathName>
 	klog.V(4).Infof("Cleaning up subpath mounts for subpath %v", subPathIndex)
 	fullSubPath := filepath.Join(fullContainerDirPath, subPathIndex)
-	notMnt, err := IsNotMountPoint(mounter, fullSubPath)
-	if err != nil {
-		return fmt.Errorf("error checking %s for mount: %s", fullSubPath, err)
+
+	if err := CleanupMountPoint(fullSubPath, mounter, true); err != nil {
+		return fmt.Errorf("error cleaning subpath mount %s: %s", fullSubPath, err)
 	}
-	// Unmount it
-	if !notMnt {
-		if err = mounter.Unmount(fullSubPath); err != nil {
-			return fmt.Errorf("error unmounting %s: %s", fullSubPath, err)
-		}
-		klog.V(5).Infof("Unmounted %s", fullSubPath)
-	}
-	// Remove it *non*-recursively, just in case there were some hiccups.
-	if err = os.Remove(fullSubPath); err != nil {
-		return fmt.Errorf("error deleting %s: %s", fullSubPath, err)
-	}
-	klog.V(5).Infof("Removed %s", fullSubPath)
+
+	klog.V(4).Infof("Successfully cleaned subpath directory %s", fullSubPath)
 	return nil
 }