Golang util.PathExists函数代码示例

// getPodVolumePathListFromDisk returns a list of the volume paths by reading the
// volume directories for the given pod from the disk.
func (kl *Kubelet) getPodVolumePathListFromDisk(podUID types.UID) ([]string, error) {
	volumes := []string{}
	podVolDir := kl.getPodVolumesDir(podUID)

	if pathExists, pathErr := volumeutil.PathExists(podVolDir); pathErr != nil {
		return volumes, fmt.Errorf("Error checking if path %q exists: %v", podVolDir, pathErr)
	} else if !pathExists {
		glog.Warningf("Warning: path %q does not exist: %q", podVolDir)
		return volumes, nil
	}

	volumePluginDirs, err := ioutil.ReadDir(podVolDir)
	if err != nil {
		glog.Errorf("Could not read directory %s: %v", podVolDir, err)
		return volumes, err
	}
	for _, volumePluginDir := range volumePluginDirs {
		volumePluginName := volumePluginDir.Name()
		volumePluginPath := path.Join(podVolDir, volumePluginName)
		volumeDirs, err := util.ReadDirNoStat(volumePluginPath)
		if err != nil {
			return volumes, fmt.Errorf("Could not read directory %s: %v", volumePluginPath, err)
		}
		for _, volumeDir := range volumeDirs {
			volumes = append(volumes, path.Join(volumePluginPath, volumeDir))
		}
	}
	return volumes, nil
}

func verifyDevicePath(path string) (string, error) {
	if pathExists, err := volumeutil.PathExists(path); err != nil {
		return "", fmt.Errorf("Error checking if path exists: %v", err)
	} else if pathExists {
		return path, nil
	}

	return "", nil
}

func (c *rbdUnmounter) TearDownAt(dir string) error {
	if pathExists, pathErr := volutil.PathExists(dir); pathErr != nil {
		return fmt.Errorf("Error checking if path exists: %v", pathErr)
	} else if !pathExists {
		glog.Warningf("Warning: Unmount skipped because path does not exist: %v", dir)
		return nil
	}
	return diskTearDown(c.manager, *c, dir, c.mounter)
}

// TearDownAt simply deletes everything in the directory.
func (f *flexVolumeUnmounter) TearDownAt(dir string) error {
	if pathExists, pathErr := util.PathExists(dir); pathErr != nil {
		return fmt.Errorf("Error checking if path exists: %v", pathErr)
	} else if !pathExists {
		glog.Warningf("Warning: Unmount skipped because path does not exist: %v", dir)
		return nil
	}

	notmnt, err := f.mounter.IsLikelyNotMountPoint(dir)
	if err != nil {
		glog.Errorf("Error checking mount point %s, error: %v", dir, err)
		return err
	}
	if notmnt {
		return os.Remove(dir)
	}

	device, refCount, err := mount.GetDeviceNameFromMount(f.mounter, dir)
	if err != nil {
		glog.Errorf("Failed to get reference count for volume: %s", dir)
		return err
	}

	if err := f.manager.unmount(f, dir); err != nil {
		if !isCmdNotSupportedErr(err) {
			glog.Errorf("Failed to unmount volume %s", f.volName)
			return err
		}
		// Unmount not supported by the driver. Use core unmount logic.
		if err := f.mounter.Unmount(dir); err != nil {
			glog.Errorf("Failed to unmount volume: %s, error: %v", dir, err)
			return err
		}
	}

	if refCount == 1 {
		if err := f.manager.detach(f, device); err != nil {
			if !isCmdNotSupportedErr(err) {
				glog.Errorf("Failed to teardown volume: %s, error: %v", dir, err)
				return err
			}
			// Teardown not supported by driver. Unmount is good enough.
		}
	}

	notmnt, err = f.mounter.IsLikelyNotMountPoint(dir)
	if err != nil {
		glog.Errorf("Error checking mount point %s, error: %v", dir, err)
		return err
	}
	if notmnt {
		return os.Remove(dir)
	}

	return nil
}

func verifyDevicePath(path string) (string, error) {
	if pathExists, err := volumeutil.PathExists(path); err != nil {
		return "", fmt.Errorf("Error checking if path exists: %v", err)
	} else if pathExists {
		return path, nil
	}

	glog.V(4).Infof("verifyDevicePath: path not exists yet")
	return "", nil
}

// WaitForDetach detects if the disk is detached on the node
func (detacher *azureDiskDetacher) WaitForDetach(devicePath string, timeout time.Duration) error {
	return wait.Poll(checkSleepDuration, timeout, func() (bool, error) {
		glog.V(4).Infof("Checking device %q is detached.", devicePath)
		if pathExists, err := util.PathExists(devicePath); err != nil {
			return false, fmt.Errorf("Error checking if device path exists: %v", err)
		} else if !pathExists {
			return true, nil
		} else {
			return false, nil
		}
	})
}

// Returns the first path that exists, or empty string if none exist.
func verifyAllPathsRemoved(devicePaths []string) (bool, error) {
	allPathsRemoved := true
	for _, path := range devicePaths {
		if exists, err := volumeutil.PathExists(path); err != nil {
			return false, fmt.Errorf("Error checking if path exists: %v", err)
		} else {
			allPathsRemoved = allPathsRemoved && !exists
		}
	}

	return allPathsRemoved, nil
}

// Unmounts the bind mount, and detaches the disk only if the PD
// resource was the last reference to that disk on the kubelet.
func (c *azureDiskUnmounter) TearDownAt(dir string) error {
	if pathExists, pathErr := util.PathExists(dir); pathErr != nil {
		return fmt.Errorf("Error checking if path exists: %v", pathErr)
	} else if !pathExists {
		glog.Warningf("Warning: Unmount skipped because path does not exist: %v", dir)
		return nil
	}

	notMnt, err := c.mounter.IsLikelyNotMountPoint(dir)
	if err != nil {
		glog.Errorf("Error checking if mountpoint %s: %v", dir, err)
		return err
	}
	if notMnt {
		glog.V(2).Info("Not mountpoint, deleting")
		return os.Remove(dir)
	}
	// lock the volume (and thus wait for any concurrrent SetUpAt to finish)
	c.plugin.volumeLocks.LockKey(c.diskName)
	defer c.plugin.volumeLocks.UnlockKey(c.diskName)
	refs, err := mount.GetMountRefs(c.mounter, dir)
	if err != nil {
		glog.Errorf("Error getting mountrefs for %s: %v", dir, err)
		return err
	}
	if len(refs) == 0 {
		glog.Errorf("Did not find pod-mount for %s during tear down", dir)
		return fmt.Errorf("%s is not mounted", dir)
	}
	c.diskName = path.Base(refs[0])
	glog.V(4).Infof("Found volume %s mounted to %s", c.diskName, dir)

	// Unmount the bind-mount inside this pod
	if err := c.mounter.Unmount(dir); err != nil {
		glog.Errorf("Error unmounting dir %s %v", dir, err)
		return err
	}
	notMnt, mntErr := c.mounter.IsLikelyNotMountPoint(dir)
	if mntErr != nil {
		glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
		return err
	}
	if notMnt {
		if err := os.Remove(dir); err != nil {
			glog.Errorf("Error removing mountpoint %s %v", dir, err)
			return err
		}
	}
	return nil
}

// Returns the first path that exists, or empty string if none exist.
func verifyAllPathsRemoved(devicePaths []string) (bool, error) {
	allPathsRemoved := true
	for _, path := range devicePaths {
		if err := udevadmChangeToDrive(path); err != nil {
			// udevadm errors should not block disk detachment, log and continue
			glog.Errorf("%v", err)
		}
		if exists, err := volumeutil.PathExists(path); err != nil {
			return false, fmt.Errorf("Error checking if path exists: %v", err)
		} else {
			allPathsRemoved = allPathsRemoved && !exists
		}
	}

	return allPathsRemoved, nil
}

// Returns the first path that exists, or empty string if none exist.
func verifyDevicePath(devicePaths []string, sdBeforeSet sets.String) (string, error) {
	if err := udevadmChangeToNewDrives(sdBeforeSet); err != nil {
		// udevadm errors should not block disk detachment, log and continue
		glog.Errorf("udevadmChangeToNewDrives failed with: %v", err)
	}

	for _, path := range devicePaths {
		if pathExists, err := volumeutil.PathExists(path); err != nil {
			return "", fmt.Errorf("Error checking if path exists: %v", err)
		} else if pathExists {
			return path, nil
		}
	}

	return "", nil
}

// UnmountViaEmptyDir delegates the tear down operation for secret, configmap, git_repo and downwardapi
// to empty_dir
func UnmountViaEmptyDir(dir string, host VolumeHost, volName string, volSpec Spec, podUID types.UID) error {
	glog.V(3).Infof("Tearing down volume %v for pod %v at %v", volName, podUID, dir)

	if pathExists, pathErr := volutil.PathExists(dir); pathErr != nil {
		return fmt.Errorf("Error checking if path exists: %v", pathErr)
	} else if !pathExists {
		glog.Warningf("Warning: Unmount skipped because path does not exist: %v", dir)
		return nil
	}

	// Wrap EmptyDir, let it do the teardown.
	wrapped, err := host.NewWrapperUnmounter(volName, volSpec, podUID)
	if err != nil {
		return err
	}
	return wrapped.TearDownAt(dir)
}

func (detacher *gcePersistentDiskDetacher) WaitForDetach(devicePath string, timeout time.Duration) error {
	ticker := time.NewTicker(checkSleepDuration)
	defer ticker.Stop()
	timer := time.NewTimer(timeout)
	defer timer.Stop()

	for {
		select {
		case <-ticker.C:
			glog.V(5).Infof("Checking device %q is detached.", devicePath)
			if pathExists, err := volumeutil.PathExists(devicePath); err != nil {
				return fmt.Errorf("Error checking if device path exists: %v", err)
			} else if !pathExists {
				return nil
			}
		case <-timer.C:
			return fmt.Errorf("Timeout reached; PD Device %v is still attached", devicePath)
		}
	}
}

// TearDownAt simply discards everything in the directory.
func (ed *emptyDir) TearDownAt(dir string) error {
	if pathExists, pathErr := volumeutil.PathExists(dir); pathErr != nil {
		return fmt.Errorf("Error checking if path exists: %v", pathErr)
	} else if !pathExists {
		glog.Warningf("Warning: Unmount skipped because path does not exist: %v", dir)
		return nil
	}

	// Figure out the medium.
	medium, isMnt, err := ed.mountDetector.GetMountMedium(dir)
	if err != nil {
		return err
	}
	if isMnt && medium == mediumMemory {
		ed.medium = v1.StorageMediumMemory
		return ed.teardownTmpfs(dir)
	}
	// assume StorageMediumDefault
	return ed.teardownDefault(dir)
}

func (attacher *cinderDiskAttacher) WaitForAttach(spec *volume.Spec, devicePath string, timeout time.Duration) (string, error) {
	// NOTE: devicePath is is path as reported by Cinder, which may be incorrect and should not be used. See Issue #33128
	volumeSource, _, err := getVolumeSource(spec)
	if err != nil {
		return "", err
	}

	volumeID := volumeSource.VolumeID

	if devicePath == "" {
		return "", fmt.Errorf("WaitForAttach failed for Cinder disk %q: devicePath is empty.", volumeID)
	}

	ticker := time.NewTicker(checkSleepDuration)
	defer ticker.Stop()
	timer := time.NewTimer(timeout)
	defer timer.Stop()

	for {
		probeAttachedVolume()
		select {
		case <-ticker.C:
			glog.V(5).Infof("Checking Cinder disk %q is attached.", volumeID)
			probeAttachedVolume()
			if !attacher.cinderProvider.ShouldTrustDevicePath() {
				// Using the Cinder volume ID, find the real device path (See Issue #33128)
				devicePath = attacher.cinderProvider.GetDevicePath(volumeID)
			}
			exists, err := volumeutil.PathExists(devicePath)
			if exists && err == nil {
				glog.Infof("Successfully found attached Cinder disk %q at %v.", volumeID, devicePath)
				return devicePath, nil
			} else {
				// Log an error, and continue checking periodically
				glog.Errorf("Error: could not find attached Cinder disk %q: %v", volumeID, err)
			}
		case <-timer.C:
			return "", fmt.Errorf("Could not find attached Cinder disk %q. Timeout waiting for mount paths to be created.", volumeID)
		}
	}
}

func (attacher *cinderDiskAttacher) WaitForAttach(spec *volume.Spec, devicePath string, timeout time.Duration) (string, error) {
	volumeSource, _, err := getVolumeSource(spec)
	if err != nil {
		return "", err
	}

	volumeID := volumeSource.VolumeID

	if devicePath == "" {
		return "", fmt.Errorf("WaitForAttach failed for Cinder disk %q: devicePath is empty.", volumeID)
	}

	ticker := time.NewTicker(checkSleepDuration)
	defer ticker.Stop()
	timer := time.NewTimer(timeout)
	defer timer.Stop()

	for {
		probeAttachedVolume()
		select {
		case <-ticker.C:
			glog.V(5).Infof("Checking Cinder disk %q is attached.", volumeID)
			probeAttachedVolume()
			exists, err := volumeutil.PathExists(devicePath)
			if exists && err == nil {
				glog.Infof("Successfully found attached Cinder disk %q.", volumeID)
				return devicePath, nil
			} else {
				//Log error, if any, and continue checking periodically
				glog.Errorf("Error Stat Cinder disk (%q) is attached: %v", volumeID, err)
			}
		case <-timer.C:
			return "", fmt.Errorf("Could not find attached Cinder disk %q. Timeout waiting for mount paths to be created.", volumeID)
		}
	}
}