mirror of
https://github.com/yunionio/cloudpods.git
synced 2026-07-05 00:24:30 +08:00
267 lines
8.1 KiB
Go
267 lines
8.1 KiB
Go
// Copyright 2019 Yunion
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package mountutils
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import (
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"context"
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"fmt"
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"os"
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"strconv"
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"strings"
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"time"
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"yunion.io/x/log"
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"yunion.io/x/pkg/errors"
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"yunion.io/x/pkg/util/sets"
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"yunion.io/x/onecloud/pkg/util/fileutils2"
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"yunion.io/x/onecloud/pkg/util/procutils"
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)
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var (
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mountTimeout = 30 * time.Second
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)
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func mountWrap(mountPoint string, action func() error) error {
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if !fileutils2.Exists(mountPoint) {
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output, err := procutils.NewCommand("mkdir", "-p", mountPoint).Output()
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if err != nil {
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return errors.Wrapf(err, "mkdir %s failed: %s", mountPoint, output)
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}
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}
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if err := procutils.NewRemoteCommandAsFarAsPossible("mountpoint", mountPoint).Run(); err == nil {
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log.Warningf("mountpoint %s is already mounted", mountPoint)
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return nil
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}
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return action()
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}
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func Mount(devPath string, mountPoint string, fsType string) error {
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return mountWrap(mountPoint, func() error {
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ctx, cancel := context.WithTimeout(context.Background(), mountTimeout)
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defer cancel()
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if out, err := procutils.NewRemoteCommandContextAsFarAsPossible(ctx, "mount", "-t", fsType, devPath, mountPoint).Output(); err != nil {
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return errors.Wrapf(err, "mount %s to %s with fs %s: %s", devPath, mountPoint, fsType, string(out))
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}
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return nil
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})
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}
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func MountWithParams(devPath string, mountPoint string, fsType string, opts []string) error {
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return mountWrap(mountPoint, func() error {
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ctx, cancel := context.WithTimeout(context.Background(), mountTimeout)
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defer cancel()
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args := []string{"-t", fsType, devPath, mountPoint}
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args = append(args, opts...)
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if out, err := procutils.NewRemoteCommandContextAsFarAsPossible(ctx, "mount", args...).Output(); err != nil {
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return errors.Wrapf(err, "mount %s to %s with fs %s: %s", devPath, mountPoint, fsType, string(out))
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}
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return nil
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})
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}
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func MountOverlay(lowerDir []string, upperDir string, workDir string, mergedDir string) error {
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return mountOverlay(lowerDir, upperDir, workDir, mergedDir, nil)
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}
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type MountOverlayFeatures struct {
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MetaCopy bool
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}
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func MountOverlayWithFeatures(lowerDir []string, upperDir string, workDir string, mergedDir string, features *MountOverlayFeatures) error {
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return mountOverlay(lowerDir, upperDir, workDir, mergedDir, features)
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}
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func mountOverlay(lowerDir []string, upperDir string, workDir string, mergedDir string, features *MountOverlayFeatures) error {
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return mountWrap(mergedDir, func() error {
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ctx, cancel := context.WithTimeout(context.Background(), mountTimeout)
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defer cancel()
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optStr := fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", strings.Join(lowerDir, ":"), upperDir, workDir)
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if features != nil {
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if features.MetaCopy {
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optStr += ",metacopy=on"
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}
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}
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overlayArgs := []string{"-t", "overlay", "overlay", "-o", optStr, mergedDir}
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if out, err := procutils.NewRemoteCommandContextAsFarAsPossible(ctx, "mount", overlayArgs...).Output(); err != nil {
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return errors.Wrapf(err, "mount %v: %s", overlayArgs, out)
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}
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return nil
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})
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}
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func MountBind(src, target string) error {
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return mountWrap(target, func() error {
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ctx, cancel := context.WithTimeout(context.Background(), mountTimeout)
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defer cancel()
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bindArgs := []string{"--bind", src, target}
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if out, err := procutils.NewRemoteCommandContextAsFarAsPossible(ctx, "mount", bindArgs...).Output(); err != nil {
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return errors.Wrapf(err, "mount %v: %s", bindArgs, out)
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}
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return nil
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})
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}
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func Unmount(mountPoint string, useLazy bool) error {
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err := unmount(mountPoint, useLazy)
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errs := []error{}
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if err != nil {
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errs = append(errs, errors.Wrap(err, "umount firstly"))
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if strings.Contains(err.Error(), "target is busy") {
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// use lsof to find process using this mountpoint and kill it
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if err := cleanProcessUseMountPoint(mountPoint); err != nil {
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errs = append(errs, errors.Wrapf(err, "clean process use mountpoint: %s", mountPoint))
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}
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// umount again
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if err := unmount(mountPoint, useLazy); err != nil {
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errs = append(errs, errors.Wrapf(err, "unmount %s after clean process using it", mountPoint))
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return errors.NewAggregate(errs)
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}
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return nil
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} else {
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return errors.NewAggregate(errs)
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}
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}
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return nil
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}
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func unmount(mountPoint string, useLazy bool) error {
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mountOut, err := procutils.NewRemoteCommandAsFarAsPossible("mountpoint", mountPoint).Output()
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if err == nil {
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args := []string{mountPoint}
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if useLazy {
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args = append([]string{"-l"}, args...)
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}
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out, err := procutils.NewRemoteCommandAsFarAsPossible("umount", args...).Output()
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if err != nil {
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//if strings.Contains(err.Error(), fmt.Sprintf("umount: %s", mountPoint)) && strings.Contains(err.Error(), "not mounted") {
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if strings.Contains(string(out), "not mounted") {
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// handle error like: 'umount: /opt/cloud/workspace/servers/2bc8dabf-88c7-448a-8f9e-cbf557acfde2/volumes/6a7ccfcc-a591-4cdd-8d3f-40fde1110870/data/data/com.douban.frodo/: not mounted.'
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return nil
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}
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return errors.Wrapf(err, "umount %s failed %s", mountPoint, out)
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}
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}
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if strings.Contains(string(mountOut), "No such file or directory") {
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return nil
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}
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if strings.Contains(string(mountOut), "not a mountpoint") {
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return nil
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}
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return errors.Wrapf(err, "check mountpoint %s: %s", mountPoint, string(mountOut))
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}
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func cleanProcessUseMountPoint(mountPoint string) error {
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devs, err := getMountPointDevices(mountPoint)
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if err != nil {
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return errors.Wrapf(err, "get mount point devices: %s", mountPoint)
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}
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errs := []error{}
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for _, dev := range devs {
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pids, err := useLsofFindDevProcess(dev)
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if err != nil {
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errs = append(errs, errors.Wrapf(err, "use lsof find device %q process", dev))
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}
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if len(pids) > 0 {
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if err := killProcess(pids); err != nil {
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errs = append(errs, errors.Wrapf(err, "kill process %q", pids))
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return errors.NewAggregate(errs)
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}
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} else {
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if err != nil {
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return errors.NewAggregate(errs)
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}
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}
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}
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return nil
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}
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func killProcess(pids []int) error {
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for _, pid := range pids {
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out, err := procutils.NewRemoteCommandAsFarAsPossible("kill", "-9", fmt.Sprintf("%d", pid)).Output()
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if err != nil {
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if strings.Contains(err.Error(), "No such process") {
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continue
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}
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return errors.Wrapf(err, "kill -9 %d: %s", pid, out)
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}
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}
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return nil
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}
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func useLsofFindDevProcess(dev string) ([]int, error) {
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out, err := procutils.NewRemoteCommandAsFarAsPossible("lsof", "+f", "--", dev).Output()
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if err != nil {
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err = errors.Wrapf(err, "'lsof +f -- %s' failed: %s", dev, out)
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if len(out) == 0 {
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return nil, err
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}
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}
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pids := sets.NewInt()
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for _, line := range strings.Split(string(out), "\n") {
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if strings.HasPrefix(line, "COMMAND") {
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continue
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}
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parts := strings.Split(line, " ")
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newParts := []string{}
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for _, part := range parts {
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if part != "" {
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newParts = append(newParts, part)
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}
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}
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if len(newParts) < 2 {
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continue
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}
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pid, err := strconv.Atoi(newParts[1])
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if err != nil {
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return nil, errors.Wrapf(err, "parse pid: %s", newParts[1])
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}
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log.Infof("find process %q use device %q", line, dev)
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pids.Insert(pid)
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}
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return pids.List(), err
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}
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func getMountPointDevices(mountPoint string) ([]string, error) {
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mountFile := "/proc/mounts"
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data, err := os.ReadFile(mountFile)
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if err != nil {
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return nil, errors.Wrapf(err, "read file %s", mountFile)
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}
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lines := strings.Split(string(data), "\n")
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devs := sets.NewString()
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for _, line := range lines {
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parts := strings.Split(line, " ")
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if len(parts) < 2 {
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continue
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}
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point := parts[1]
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if point != mountPoint {
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continue
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}
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seg1 := parts[0]
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var dev string
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switch seg1 {
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case "sysfs", "proc", "tmpfs", "overlay":
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dev = point
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default:
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dev = seg1
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}
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devs.Insert(dev)
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}
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return devs.List(), nil
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}
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