mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
358 lines
9 KiB
Go
358 lines
9 KiB
Go
package daemon
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/pkg/chrootarchive"
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"github.com/docker/docker/pkg/system"
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"github.com/docker/docker/runconfig"
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"github.com/docker/docker/volume"
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"github.com/docker/docker/volume/local"
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"github.com/docker/libcontainer/label"
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)
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type mountPoint struct {
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Name string
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Destination string
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Driver string
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RW bool
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Volume volume.Volume `json:"-"`
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Source string
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Relabel string
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}
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func (m *mountPoint) Setup() (string, error) {
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if m.Volume != nil {
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return m.Volume.Mount()
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}
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if len(m.Source) > 0 {
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if _, err := os.Stat(m.Source); err != nil {
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if !os.IsNotExist(err) {
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return "", err
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}
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if err := system.MkdirAll(m.Source, 0755); err != nil {
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return "", err
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}
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}
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return m.Source, nil
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}
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return "", fmt.Errorf("Unable to setup mount point, neither source nor volume defined")
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}
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func (m *mountPoint) Path() string {
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if m.Volume != nil {
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return m.Volume.Path()
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}
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return m.Source
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}
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// BackwardsCompatible decides whether this mount point can be
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// used in old versions of Docker or not.
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// Only bind mounts and local volumes can be used in old versions of Docker.
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func (m *mountPoint) BackwardsCompatible() bool {
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return len(m.Source) > 0 || m.Driver == volume.DefaultDriverName
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}
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func parseBindMount(spec string, mountLabel string, config *runconfig.Config) (*mountPoint, error) {
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bind := &mountPoint{
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RW: true,
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}
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arr := strings.Split(spec, ":")
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switch len(arr) {
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case 2:
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bind.Destination = arr[1]
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case 3:
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bind.Destination = arr[1]
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mode := arr[2]
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if !validMountMode(mode) {
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return nil, fmt.Errorf("invalid mode for volumes-from: %s", mode)
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}
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bind.RW = rwModes[mode]
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// Relabel will apply a SELinux label, if necessary
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bind.Relabel = mode
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default:
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return nil, fmt.Errorf("Invalid volume specification: %s", spec)
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}
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name, source, err := parseVolumeSource(arr[0])
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if err != nil {
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return nil, err
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}
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if len(source) == 0 {
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bind.Driver = config.VolumeDriver
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if len(bind.Driver) == 0 {
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bind.Driver = volume.DefaultDriverName
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}
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} else {
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bind.Source = filepath.Clean(source)
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}
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bind.Name = name
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bind.Destination = filepath.Clean(bind.Destination)
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return bind, nil
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}
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func parseVolumesFrom(spec string) (string, string, error) {
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if len(spec) == 0 {
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return "", "", fmt.Errorf("malformed volumes-from specification: %s", spec)
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}
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specParts := strings.SplitN(spec, ":", 2)
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id := specParts[0]
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mode := "rw"
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if len(specParts) == 2 {
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mode = specParts[1]
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if !validMountMode(mode) {
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return "", "", fmt.Errorf("invalid mode for volumes-from: %s", mode)
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}
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}
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return id, mode, nil
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}
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// read-write modes
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var rwModes = map[string]bool{
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"rw": true,
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"rw,Z": true,
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"rw,z": true,
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"z,rw": true,
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"Z,rw": true,
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"Z": true,
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"z": true,
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}
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// read-only modes
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var roModes = map[string]bool{
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"ro": true,
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"ro,Z": true,
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"ro,z": true,
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"z,ro": true,
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"Z,ro": true,
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}
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func validMountMode(mode string) bool {
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return roModes[mode] || rwModes[mode]
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}
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func copyExistingContents(source, destination string) error {
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volList, err := ioutil.ReadDir(source)
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if err != nil {
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return err
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}
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if len(volList) > 0 {
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srcList, err := ioutil.ReadDir(destination)
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if err != nil {
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return err
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}
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if len(srcList) == 0 {
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// If the source volume is empty copy files from the root into the volume
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if err := chrootarchive.CopyWithTar(source, destination); err != nil {
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return err
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}
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}
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}
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return copyOwnership(source, destination)
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}
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// registerMountPoints initializes the container mount points with the configured volumes and bind mounts.
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// It follows the next sequence to decide what to mount in each final destination:
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//
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// 1. Select the previously configured mount points for the containers, if any.
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// 2. Select the volumes mounted from another containers. Overrides previously configured mount point destination.
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// 3. Select the bind mounts set by the client. Overrides previously configured mount point destinations.
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func (daemon *Daemon) registerMountPoints(container *Container, hostConfig *runconfig.HostConfig) error {
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binds := map[string]bool{}
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mountPoints := map[string]*mountPoint{}
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// 1. Read already configured mount points.
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for name, point := range container.MountPoints {
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mountPoints[name] = point
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}
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// 2. Read volumes from other containers.
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for _, v := range hostConfig.VolumesFrom {
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containerID, mode, err := parseVolumesFrom(v)
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if err != nil {
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return err
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}
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c, err := daemon.Get(containerID)
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if err != nil {
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return err
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}
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for _, m := range c.MountPoints {
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cp := &mountPoint{
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Name: m.Name,
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Source: m.Source,
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RW: m.RW && !roModes[mode],
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Driver: m.Driver,
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Destination: m.Destination,
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}
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if len(cp.Source) == 0 {
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v, err := createVolume(cp.Name, cp.Driver)
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if err != nil {
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return err
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}
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cp.Volume = v
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}
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mountPoints[cp.Destination] = cp
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}
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}
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// 3. Read bind mounts
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for _, b := range hostConfig.Binds {
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// #10618
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bind, err := parseBindMount(b, container.MountLabel, container.Config)
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if err != nil {
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return err
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}
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if binds[bind.Destination] {
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return fmt.Errorf("Duplicate bind mount %s", bind.Destination)
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}
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if len(bind.Name) > 0 && len(bind.Driver) > 0 {
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// create the volume
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v, err := createVolume(bind.Name, bind.Driver)
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if err != nil {
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return err
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}
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bind.Volume = v
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bind.Source = v.Path()
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// Since this is just a named volume and not a typical bind, set to shared mode `z`
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if bind.Relabel == "" {
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bind.Relabel = "z"
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}
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}
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if err := label.Relabel(bind.Source, container.MountLabel, bind.Relabel); err != nil {
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return err
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}
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binds[bind.Destination] = true
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mountPoints[bind.Destination] = bind
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}
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// Keep backwards compatible structures
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bcVolumes := map[string]string{}
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bcVolumesRW := map[string]bool{}
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for _, m := range mountPoints {
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if m.BackwardsCompatible() {
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bcVolumes[m.Destination] = m.Path()
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bcVolumesRW[m.Destination] = m.RW
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}
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}
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container.Lock()
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container.MountPoints = mountPoints
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container.Volumes = bcVolumes
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container.VolumesRW = bcVolumesRW
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container.Unlock()
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return nil
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}
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// TODO Windows. Factor out as not relevant (as Windows daemon support not in pre-1.7)
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// verifyVolumesInfo ports volumes configured for the containers pre docker 1.7.
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// It reads the container configuration and creates valid mount points for the old volumes.
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func (daemon *Daemon) verifyVolumesInfo(container *Container) error {
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// Inspect old structures only when we're upgrading from old versions
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// to versions >= 1.7 and the MountPoints has not been populated with volumes data.
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if len(container.MountPoints) == 0 && len(container.Volumes) > 0 {
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for destination, hostPath := range container.Volumes {
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vfsPath := filepath.Join(daemon.root, "vfs", "dir")
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rw := container.VolumesRW != nil && container.VolumesRW[destination]
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if strings.HasPrefix(hostPath, vfsPath) {
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id := filepath.Base(hostPath)
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if err := migrateVolume(id, hostPath); err != nil {
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return err
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}
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container.addLocalMountPoint(id, destination, rw)
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} else { // Bind mount
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id, source, err := parseVolumeSource(hostPath)
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// We should not find an error here coming
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// from the old configuration, but who knows.
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if err != nil {
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return err
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}
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container.addBindMountPoint(id, source, destination, rw)
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}
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}
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} else if len(container.MountPoints) > 0 {
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// Volumes created with a Docker version >= 1.7. We verify integrity in case of data created
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// with Docker 1.7 RC versions that put the information in
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// DOCKER_ROOT/volumes/VOLUME_ID rather than DOCKER_ROOT/volumes/VOLUME_ID/_container_data.
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l, err := getVolumeDriver(volume.DefaultDriverName)
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if err != nil {
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return err
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}
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for _, m := range container.MountPoints {
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if m.Driver != volume.DefaultDriverName {
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continue
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}
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dataPath := l.(*local.Root).DataPath(m.Name)
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volumePath := filepath.Dir(dataPath)
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d, err := ioutil.ReadDir(volumePath)
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if err != nil {
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// If the volume directory doesn't exist yet it will be recreated,
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// so we only return the error when there is a different issue.
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if !os.IsNotExist(err) {
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return err
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}
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// Do not check when the volume directory does not exist.
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continue
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}
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if validVolumeLayout(d) {
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continue
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}
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if err := os.Mkdir(dataPath, 0755); err != nil {
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return err
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}
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// Move data inside the data directory
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for _, f := range d {
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oldp := filepath.Join(volumePath, f.Name())
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newp := filepath.Join(dataPath, f.Name())
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if err := os.Rename(oldp, newp); err != nil {
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logrus.Errorf("Unable to move %s to %s\n", oldp, newp)
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}
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}
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}
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return container.ToDisk()
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}
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return nil
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}
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func createVolume(name, driverName string) (volume.Volume, error) {
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vd, err := getVolumeDriver(driverName)
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if err != nil {
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return nil, err
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}
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return vd.Create(name)
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}
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func removeVolume(v volume.Volume) error {
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vd, err := getVolumeDriver(v.DriverName())
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if err != nil {
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return nil
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}
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return vd.Remove(v)
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}
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