mirror of https://github.com/k3s-io/k3s
104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package mount
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import (
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"fmt"
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"os"
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"k8s.io/klog/v2"
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)
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// CleanupMountPoint unmounts the given path and deletes the remaining directory
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// if successful. If extensiveMountPointCheck is true IsNotMountPoint will be
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// called instead of IsLikelyNotMountPoint. IsNotMountPoint is more expensive
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// but properly handles bind mounts within the same fs.
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func CleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool) error {
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pathExists, pathErr := PathExists(mountPath)
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if !pathExists {
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klog.Warningf("Warning: Unmount skipped because path does not exist: %v", mountPath)
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return nil
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}
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corruptedMnt := IsCorruptedMnt(pathErr)
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if pathErr != nil && !corruptedMnt {
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return fmt.Errorf("Error checking path: %v", pathErr)
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}
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return doCleanupMountPoint(mountPath, mounter, extensiveMountPointCheck, corruptedMnt)
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}
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// doCleanupMountPoint unmounts the given path and
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// deletes the remaining directory if successful.
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// if extensiveMountPointCheck is true
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// IsNotMountPoint will be called instead of IsLikelyNotMountPoint.
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// IsNotMountPoint is more expensive but properly handles bind mounts within the same fs.
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// if corruptedMnt is true, it means that the mountPath is a corrupted mountpoint, and the mount point check
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// will be skipped
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func doCleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool, corruptedMnt bool) error {
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var notMnt bool
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var err error
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if !corruptedMnt {
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if extensiveMountPointCheck {
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notMnt, err = IsNotMountPoint(mounter, mountPath)
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} else {
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notMnt, err = mounter.IsLikelyNotMountPoint(mountPath)
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}
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if err != nil {
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return err
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}
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if notMnt {
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klog.Warningf("Warning: %q is not a mountpoint, deleting", mountPath)
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return os.Remove(mountPath)
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}
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}
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// Unmount the mount path
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klog.V(4).Infof("%q is a mountpoint, unmounting", mountPath)
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if err := mounter.Unmount(mountPath); err != nil {
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return err
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}
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if extensiveMountPointCheck {
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notMnt, err = IsNotMountPoint(mounter, mountPath)
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} else {
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notMnt, err = mounter.IsLikelyNotMountPoint(mountPath)
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}
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if err != nil {
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return err
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}
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if notMnt {
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klog.V(4).Infof("%q is unmounted, deleting the directory", mountPath)
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return os.Remove(mountPath)
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}
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return fmt.Errorf("Failed to unmount path %v", mountPath)
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}
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// PathExists returns true if the specified path exists.
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// TODO: clean this up to use pkg/util/file/FileExists
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func PathExists(path string) (bool, error) {
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_, err := os.Stat(path)
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if err == nil {
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return true, nil
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} else if os.IsNotExist(err) {
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return false, nil
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} else if IsCorruptedMnt(err) {
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return true, err
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}
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return false, err
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}
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