140 lines
4.4 KiB
Go
140 lines
4.4 KiB
Go
// +build linux
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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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"github.com/golang/glog"
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)
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// ExecMounter is a mounter that uses provided Exec interface to mount and
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// unmount a filesystem. For all other calls it uses a wrapped mounter.
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type execMounter struct {
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wrappedMounter Interface
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exec Exec
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}
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func NewExecMounter(exec Exec, wrapped Interface) Interface {
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return &execMounter{
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wrappedMounter: wrapped,
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exec: exec,
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}
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}
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// execMounter implements mount.Interface
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var _ Interface = &execMounter{}
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// Mount runs mount(8) using given exec interface.
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func (m *execMounter) Mount(source string, target string, fstype string, options []string) error {
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bind, bindRemountOpts := isBind(options)
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if bind {
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err := m.doExecMount(source, target, fstype, []string{"bind"})
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if err != nil {
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return err
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}
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return m.doExecMount(source, target, fstype, bindRemountOpts)
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}
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return m.doExecMount(source, target, fstype, options)
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}
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// doExecMount calls exec(mount <what> <where>) using given exec interface.
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func (m *execMounter) doExecMount(source, target, fstype string, options []string) error {
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glog.V(5).Infof("Exec Mounting %s %s %s %v", source, target, fstype, options)
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mountArgs := makeMountArgs(source, target, fstype, options)
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output, err := m.exec.Run("mount", mountArgs...)
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glog.V(5).Infof("Exec mounted %v: %v: %s", mountArgs, err, string(output))
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if err != nil {
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return fmt.Errorf("mount failed: %v\nMounting command: %s\nMounting arguments: %s %s %s %v\nOutput: %s\n",
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err, "mount", source, target, fstype, options, string(output))
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}
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return err
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}
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// Unmount runs umount(8) using given exec interface.
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func (m *execMounter) Unmount(target string) error {
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outputBytes, err := m.exec.Run("umount", target)
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if err == nil {
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glog.V(5).Infof("Exec unmounted %s: %s", target, string(outputBytes))
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} else {
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glog.V(5).Infof("Failed to exec unmount %s: err: %q, umount output: %s", target, err, string(outputBytes))
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}
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return err
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}
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// List returns a list of all mounted filesystems.
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func (m *execMounter) List() ([]MountPoint, error) {
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return m.wrappedMounter.List()
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}
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// IsLikelyNotMountPoint determines whether a path is a mountpoint.
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func (m *execMounter) IsLikelyNotMountPoint(file string) (bool, error) {
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return m.wrappedMounter.IsLikelyNotMountPoint(file)
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}
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// DeviceOpened checks if block device in use by calling Open with O_EXCL flag.
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// Returns true if open returns errno EBUSY, and false if errno is nil.
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// Returns an error if errno is any error other than EBUSY.
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// Returns with error if pathname is not a device.
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func (m *execMounter) DeviceOpened(pathname string) (bool, error) {
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return m.wrappedMounter.DeviceOpened(pathname)
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}
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// PathIsDevice uses FileInfo returned from os.Stat to check if path refers
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// to a device.
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func (m *execMounter) PathIsDevice(pathname string) (bool, error) {
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return m.wrappedMounter.PathIsDevice(pathname)
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}
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//GetDeviceNameFromMount given a mount point, find the volume id from checking /proc/mounts
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func (m *execMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error) {
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return m.wrappedMounter.GetDeviceNameFromMount(mountPath, pluginDir)
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}
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func (m *execMounter) IsMountPointMatch(mp MountPoint, dir string) bool {
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return m.wrappedMounter.IsMountPointMatch(mp, dir)
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}
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func (m *execMounter) IsNotMountPoint(dir string) (bool, error) {
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return m.wrappedMounter.IsNotMountPoint(dir)
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}
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func (m *execMounter) MakeRShared(path string) error {
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return m.wrappedMounter.MakeRShared(path)
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}
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func (m *execMounter) GetFileType(pathname string) (FileType, error) {
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return m.wrappedMounter.GetFileType(pathname)
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}
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func (m *execMounter) MakeFile(pathname string) error {
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return m.wrappedMounter.MakeFile(pathname)
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}
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func (m *execMounter) MakeDir(pathname string) error {
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return m.wrappedMounter.MakeDir(pathname)
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}
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func (m *execMounter) ExistsPath(pathname string) bool {
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return m.wrappedMounter.ExistsPath(pathname)
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}
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