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281 lines
9.7 KiB
Go
281 lines
9.7 KiB
Go
// +build windows
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/*
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Copyright 2017 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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"os/exec"
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"path/filepath"
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"strings"
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"k8s.io/klog"
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utilexec "k8s.io/utils/exec"
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"k8s.io/utils/keymutex"
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utilpath "k8s.io/utils/path"
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)
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// Mounter provides the default implementation of mount.Interface
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// for the windows platform. This implementation assumes that the
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// kubelet is running in the host's root mount namespace.
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type Mounter struct {
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mounterPath string
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}
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// New returns a mount.Interface for the current system.
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// It provides options to override the default mounter behavior.
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// mounterPath allows using an alternative to `/bin/mount` for mounting.
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func New(mounterPath string) Interface {
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return &Mounter{
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mounterPath: mounterPath,
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}
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}
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// acquire lock for smb mount
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var getSMBMountMutex = keymutex.NewHashed(0)
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// Mount : mounts source to target with given options.
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// currently only supports cifs(smb), bind mount(for disk)
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func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error {
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target = NormalizeWindowsPath(target)
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if source == "tmpfs" {
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klog.V(3).Infof("mounting source (%q), target (%q), with options (%q)", source, target, options)
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return os.MkdirAll(target, 0755)
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}
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parentDir := filepath.Dir(target)
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if err := os.MkdirAll(parentDir, 0755); err != nil {
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return err
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}
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klog.V(4).Infof("mount options(%q) source:%q, target:%q, fstype:%q, begin to mount",
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options, source, target, fstype)
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bindSource := source
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// tell it's going to mount azure disk or azure file according to options
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if bind, _, _ := MakeBindOpts(options); bind {
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// mount azure disk
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bindSource = NormalizeWindowsPath(source)
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} else {
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if len(options) < 2 {
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klog.Warningf("mount options(%q) command number(%d) less than 2, source:%q, target:%q, skip mounting",
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options, len(options), source, target)
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return nil
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}
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// currently only cifs mount is supported
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if strings.ToLower(fstype) != "cifs" {
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return fmt.Errorf("only cifs mount is supported now, fstype: %q, mounting source (%q), target (%q), with options (%q)", fstype, source, target, options)
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}
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// lock smb mount for the same source
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getSMBMountMutex.LockKey(source)
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defer getSMBMountMutex.UnlockKey(source)
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if output, err := newSMBMapping(options[0], options[1], source); err != nil {
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if isSMBMappingExist(source) {
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klog.V(2).Infof("SMB Mapping(%s) already exists, now begin to remove and remount", source)
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if output, err := removeSMBMapping(source); err != nil {
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return fmt.Errorf("Remove-SmbGlobalMapping failed: %v, output: %q", err, output)
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}
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if output, err := newSMBMapping(options[0], options[1], source); err != nil {
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return fmt.Errorf("New-SmbGlobalMapping remount failed: %v, output: %q", err, output)
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}
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} else {
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return fmt.Errorf("New-SmbGlobalMapping failed: %v, output: %q", err, output)
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}
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}
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}
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if output, err := exec.Command("cmd", "/c", "mklink", "/D", target, bindSource).CombinedOutput(); err != nil {
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klog.Errorf("mklink failed: %v, source(%q) target(%q) output: %q", err, bindSource, target, string(output))
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return err
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}
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return nil
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}
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// do the SMB mount with username, password, remotepath
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// return (output, error)
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func newSMBMapping(username, password, remotepath string) (string, error) {
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if username == "" || password == "" || remotepath == "" {
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return "", fmt.Errorf("invalid parameter(username: %s, password: %s, remoteapth: %s)", username, password, remotepath)
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}
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// use PowerShell Environment Variables to store user input string to prevent command line injection
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// https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_environment_variables?view=powershell-5.1
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cmdLine := `$PWord = ConvertTo-SecureString -String $Env:smbpassword -AsPlainText -Force` +
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`;$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $Env:smbuser, $PWord` +
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`;New-SmbGlobalMapping -RemotePath $Env:smbremotepath -Credential $Credential`
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cmd := exec.Command("powershell", "/c", cmdLine)
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cmd.Env = append(os.Environ(),
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fmt.Sprintf("smbuser=%s", username),
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fmt.Sprintf("smbpassword=%s", password),
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fmt.Sprintf("smbremotepath=%s", remotepath))
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output, err := cmd.CombinedOutput()
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return string(output), err
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}
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// check whether remotepath is already mounted
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func isSMBMappingExist(remotepath string) bool {
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cmd := exec.Command("powershell", "/c", `Get-SmbGlobalMapping -RemotePath $Env:smbremotepath`)
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cmd.Env = append(os.Environ(), fmt.Sprintf("smbremotepath=%s", remotepath))
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_, err := cmd.CombinedOutput()
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return err == nil
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}
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// remove SMB mapping
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func removeSMBMapping(remotepath string) (string, error) {
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cmd := exec.Command("powershell", "/c", `Remove-SmbGlobalMapping -RemotePath $Env:smbremotepath -Force`)
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cmd.Env = append(os.Environ(), fmt.Sprintf("smbremotepath=%s", remotepath))
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output, err := cmd.CombinedOutput()
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return string(output), err
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}
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// Unmount unmounts the target.
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func (mounter *Mounter) Unmount(target string) error {
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klog.V(4).Infof("azureMount: Unmount target (%q)", target)
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target = NormalizeWindowsPath(target)
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if output, err := exec.Command("cmd", "/c", "rmdir", target).CombinedOutput(); err != nil {
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klog.Errorf("rmdir failed: %v, output: %q", err, string(output))
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return err
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}
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return nil
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}
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// List returns a list of all mounted filesystems. todo
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func (mounter *Mounter) List() ([]MountPoint, error) {
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return []MountPoint{}, nil
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}
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// IsLikelyNotMountPoint determines if a directory is not a mountpoint.
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func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error) {
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stat, err := os.Lstat(file)
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if err != nil {
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return true, err
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}
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// If current file is a symlink, then it is a mountpoint.
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if stat.Mode()&os.ModeSymlink != 0 {
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target, err := os.Readlink(file)
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if err != nil {
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return true, fmt.Errorf("readlink error: %v", err)
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}
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exists, err := utilpath.Exists(utilpath.CheckFollowSymlink, target)
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if err != nil {
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return true, err
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}
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return !exists, nil
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}
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return true, nil
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}
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// GetMountRefs : empty implementation here since there is no place to query all mount points on Windows
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func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error) {
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windowsPath := NormalizeWindowsPath(pathname)
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pathExists, pathErr := PathExists(windowsPath)
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if !pathExists {
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return []string{}, nil
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} else if IsCorruptedMnt(pathErr) {
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klog.Warningf("GetMountRefs found corrupted mount at %s, treating as unmounted path", windowsPath)
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return []string{}, nil
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} else if pathErr != nil {
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return nil, fmt.Errorf("error checking path %s: %v", windowsPath, pathErr)
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}
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return []string{pathname}, nil
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}
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func (mounter *SafeFormatAndMount) formatAndMount(source string, target string, fstype string, options []string) error {
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// Try to mount the disk
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klog.V(4).Infof("Attempting to formatAndMount disk: %s %s %s", fstype, source, target)
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if err := ValidateDiskNumber(source); err != nil {
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klog.Errorf("diskMount: formatAndMount failed, err: %v", err)
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return err
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}
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if len(fstype) == 0 {
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// Use 'NTFS' as the default
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fstype = "NTFS"
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}
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// format disk if it is unformatted(raw)
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cmd := fmt.Sprintf("Get-Disk -Number %s | Where partitionstyle -eq 'raw' | Initialize-Disk -PartitionStyle MBR -PassThru"+
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" | New-Partition -AssignDriveLetter -UseMaximumSize | Format-Volume -FileSystem %s -Confirm:$false", source, fstype)
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if output, err := mounter.Exec.Command("powershell", "/c", cmd).CombinedOutput(); err != nil {
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return fmt.Errorf("diskMount: format disk failed, error: %v, output: %q", err, string(output))
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}
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klog.V(4).Infof("diskMount: Disk successfully formatted, disk: %q, fstype: %q", source, fstype)
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driveLetter, err := getDriveLetterByDiskNumber(source, mounter.Exec)
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if err != nil {
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return err
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}
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driverPath := driveLetter + ":"
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target = NormalizeWindowsPath(target)
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klog.V(4).Infof("Attempting to formatAndMount disk: %s %s %s", fstype, driverPath, target)
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if output, err := mounter.Exec.Command("cmd", "/c", "mklink", "/D", target, driverPath).CombinedOutput(); err != nil {
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klog.Errorf("mklink failed: %v, output: %q", err, string(output))
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return err
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}
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return nil
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}
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// Get drive letter according to windows disk number
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func getDriveLetterByDiskNumber(diskNum string, exec utilexec.Interface) (string, error) {
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cmd := fmt.Sprintf("(Get-Partition -DiskNumber %s).DriveLetter", diskNum)
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output, err := exec.Command("powershell", "/c", cmd).CombinedOutput()
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if err != nil {
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return "", fmt.Errorf("azureMount: Get Drive Letter failed: %v, output: %q", err, string(output))
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}
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if len(string(output)) < 1 {
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return "", fmt.Errorf("azureMount: Get Drive Letter failed, output is empty")
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}
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return string(output)[:1], nil
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}
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// getAllParentLinks walks all symbolic links and return all the parent targets recursively
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func getAllParentLinks(path string) ([]string, error) {
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const maxIter = 255
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links := []string{}
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for {
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links = append(links, path)
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if len(links) > maxIter {
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return links, fmt.Errorf("unexpected length of parent links: %v", links)
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}
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fi, err := os.Lstat(path)
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if err != nil {
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return links, fmt.Errorf("Lstat: %v", err)
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}
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if fi.Mode()&os.ModeSymlink == 0 {
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break
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}
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path, err = os.Readlink(path)
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if err != nil {
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return links, fmt.Errorf("Readlink error: %v", err)
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}
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}
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return links, nil
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}
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