mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
b28d6eaa94
Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
358 lines
9 KiB
Go
358 lines
9 KiB
Go
package daemon
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"github.com/docker/docker/pkg/chrootarchive"
|
|
"github.com/docker/docker/pkg/system"
|
|
"github.com/docker/docker/runconfig"
|
|
"github.com/docker/docker/volume"
|
|
"github.com/docker/docker/volume/local"
|
|
"github.com/docker/libcontainer/label"
|
|
)
|
|
|
|
type mountPoint struct {
|
|
Name string
|
|
Destination string
|
|
Driver string
|
|
RW bool
|
|
Volume volume.Volume `json:"-"`
|
|
Source string
|
|
Relabel string
|
|
}
|
|
|
|
func (m *mountPoint) Setup() (string, error) {
|
|
if m.Volume != nil {
|
|
return m.Volume.Mount()
|
|
}
|
|
|
|
if len(m.Source) > 0 {
|
|
if _, err := os.Stat(m.Source); err != nil {
|
|
if !os.IsNotExist(err) {
|
|
return "", err
|
|
}
|
|
if err := system.MkdirAll(m.Source, 0755); err != nil {
|
|
return "", err
|
|
}
|
|
}
|
|
return m.Source, nil
|
|
}
|
|
|
|
return "", fmt.Errorf("Unable to setup mount point, neither source nor volume defined")
|
|
}
|
|
|
|
func (m *mountPoint) Path() string {
|
|
if m.Volume != nil {
|
|
return m.Volume.Path()
|
|
}
|
|
|
|
return m.Source
|
|
}
|
|
|
|
// BackwardsCompatible decides whether this mount point can be
|
|
// used in old versions of Docker or not.
|
|
// Only bind mounts and local volumes can be used in old versions of Docker.
|
|
func (m *mountPoint) BackwardsCompatible() bool {
|
|
return len(m.Source) > 0 || m.Driver == volume.DefaultDriverName
|
|
}
|
|
|
|
func parseBindMount(spec string, mountLabel string, config *runconfig.Config) (*mountPoint, error) {
|
|
bind := &mountPoint{
|
|
RW: true,
|
|
}
|
|
arr := strings.Split(spec, ":")
|
|
|
|
switch len(arr) {
|
|
case 2:
|
|
bind.Destination = arr[1]
|
|
case 3:
|
|
bind.Destination = arr[1]
|
|
mode := arr[2]
|
|
if !validMountMode(mode) {
|
|
return nil, fmt.Errorf("invalid mode for volumes-from: %s", mode)
|
|
}
|
|
bind.RW = rwModes[mode]
|
|
// Relabel will apply a SELinux label, if necessary
|
|
bind.Relabel = mode
|
|
default:
|
|
return nil, fmt.Errorf("Invalid volume specification: %s", spec)
|
|
}
|
|
|
|
name, source, err := parseVolumeSource(arr[0])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(source) == 0 {
|
|
bind.Driver = config.VolumeDriver
|
|
if len(bind.Driver) == 0 {
|
|
bind.Driver = volume.DefaultDriverName
|
|
}
|
|
} else {
|
|
bind.Source = filepath.Clean(source)
|
|
}
|
|
|
|
bind.Name = name
|
|
bind.Destination = filepath.Clean(bind.Destination)
|
|
return bind, nil
|
|
}
|
|
|
|
func parseVolumesFrom(spec string) (string, string, error) {
|
|
if len(spec) == 0 {
|
|
return "", "", fmt.Errorf("malformed volumes-from specification: %s", spec)
|
|
}
|
|
|
|
specParts := strings.SplitN(spec, ":", 2)
|
|
id := specParts[0]
|
|
mode := "rw"
|
|
|
|
if len(specParts) == 2 {
|
|
mode = specParts[1]
|
|
if !validMountMode(mode) {
|
|
return "", "", fmt.Errorf("invalid mode for volumes-from: %s", mode)
|
|
}
|
|
}
|
|
return id, mode, nil
|
|
}
|
|
|
|
// read-write modes
|
|
var rwModes = map[string]bool{
|
|
"rw": true,
|
|
"rw,Z": true,
|
|
"rw,z": true,
|
|
"z,rw": true,
|
|
"Z,rw": true,
|
|
"Z": true,
|
|
"z": true,
|
|
}
|
|
|
|
// read-only modes
|
|
var roModes = map[string]bool{
|
|
"ro": true,
|
|
"ro,Z": true,
|
|
"ro,z": true,
|
|
"z,ro": true,
|
|
"Z,ro": true,
|
|
}
|
|
|
|
func validMountMode(mode string) bool {
|
|
return roModes[mode] || rwModes[mode]
|
|
}
|
|
|
|
func copyExistingContents(source, destination string) error {
|
|
volList, err := ioutil.ReadDir(source)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(volList) > 0 {
|
|
srcList, err := ioutil.ReadDir(destination)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(srcList) == 0 {
|
|
// If the source volume is empty copy files from the root into the volume
|
|
if err := chrootarchive.CopyWithTar(source, destination); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return copyOwnership(source, destination)
|
|
}
|
|
|
|
// registerMountPoints initializes the container mount points with the configured volumes and bind mounts.
|
|
// It follows the next sequence to decide what to mount in each final destination:
|
|
//
|
|
// 1. Select the previously configured mount points for the containers, if any.
|
|
// 2. Select the volumes mounted from another containers. Overrides previously configured mount point destination.
|
|
// 3. Select the bind mounts set by the client. Overrides previously configured mount point destinations.
|
|
func (daemon *Daemon) registerMountPoints(container *Container, hostConfig *runconfig.HostConfig) error {
|
|
binds := map[string]bool{}
|
|
mountPoints := map[string]*mountPoint{}
|
|
|
|
// 1. Read already configured mount points.
|
|
for name, point := range container.MountPoints {
|
|
mountPoints[name] = point
|
|
}
|
|
|
|
// 2. Read volumes from other containers.
|
|
for _, v := range hostConfig.VolumesFrom {
|
|
containerID, mode, err := parseVolumesFrom(v)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c, err := daemon.Get(containerID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, m := range c.MountPoints {
|
|
cp := &mountPoint{
|
|
Name: m.Name,
|
|
Source: m.Source,
|
|
RW: m.RW && !roModes[mode],
|
|
Driver: m.Driver,
|
|
Destination: m.Destination,
|
|
}
|
|
|
|
if len(cp.Source) == 0 {
|
|
v, err := createVolume(cp.Name, cp.Driver)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
cp.Volume = v
|
|
}
|
|
|
|
mountPoints[cp.Destination] = cp
|
|
}
|
|
}
|
|
|
|
// 3. Read bind mounts
|
|
for _, b := range hostConfig.Binds {
|
|
// #10618
|
|
bind, err := parseBindMount(b, container.MountLabel, container.Config)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if binds[bind.Destination] {
|
|
return fmt.Errorf("Duplicate bind mount %s", bind.Destination)
|
|
}
|
|
|
|
if len(bind.Name) > 0 && len(bind.Driver) > 0 {
|
|
// create the volume
|
|
v, err := createVolume(bind.Name, bind.Driver)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
bind.Volume = v
|
|
bind.Source = v.Path()
|
|
// Since this is just a named volume and not a typical bind, set to shared mode `z`
|
|
if bind.Relabel == "" {
|
|
bind.Relabel = "z"
|
|
}
|
|
}
|
|
|
|
if err := label.Relabel(bind.Source, container.MountLabel, bind.Relabel); err != nil {
|
|
return err
|
|
}
|
|
binds[bind.Destination] = true
|
|
mountPoints[bind.Destination] = bind
|
|
}
|
|
|
|
// Keep backwards compatible structures
|
|
bcVolumes := map[string]string{}
|
|
bcVolumesRW := map[string]bool{}
|
|
for _, m := range mountPoints {
|
|
if m.BackwardsCompatible() {
|
|
bcVolumes[m.Destination] = m.Path()
|
|
bcVolumesRW[m.Destination] = m.RW
|
|
}
|
|
}
|
|
|
|
container.Lock()
|
|
container.MountPoints = mountPoints
|
|
container.Volumes = bcVolumes
|
|
container.VolumesRW = bcVolumesRW
|
|
container.Unlock()
|
|
|
|
return nil
|
|
}
|
|
|
|
// TODO Windows. Factor out as not relevant (as Windows daemon support not in pre-1.7)
|
|
// verifyVolumesInfo ports volumes configured for the containers pre docker 1.7.
|
|
// It reads the container configuration and creates valid mount points for the old volumes.
|
|
func (daemon *Daemon) verifyVolumesInfo(container *Container) error {
|
|
// Inspect old structures only when we're upgrading from old versions
|
|
// to versions >= 1.7 and the MountPoints has not been populated with volumes data.
|
|
if len(container.MountPoints) == 0 && len(container.Volumes) > 0 {
|
|
for destination, hostPath := range container.Volumes {
|
|
vfsPath := filepath.Join(daemon.root, "vfs", "dir")
|
|
rw := container.VolumesRW != nil && container.VolumesRW[destination]
|
|
|
|
if strings.HasPrefix(hostPath, vfsPath) {
|
|
id := filepath.Base(hostPath)
|
|
if err := migrateVolume(id, hostPath); err != nil {
|
|
return err
|
|
}
|
|
container.addLocalMountPoint(id, destination, rw)
|
|
} else { // Bind mount
|
|
id, source, err := parseVolumeSource(hostPath)
|
|
// We should not find an error here coming
|
|
// from the old configuration, but who knows.
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.addBindMountPoint(id, source, destination, rw)
|
|
}
|
|
}
|
|
} else if len(container.MountPoints) > 0 {
|
|
// Volumes created with a Docker version >= 1.7. We verify integrity in case of data created
|
|
// with Docker 1.7 RC versions that put the information in
|
|
// DOCKER_ROOT/volumes/VOLUME_ID rather than DOCKER_ROOT/volumes/VOLUME_ID/_container_data.
|
|
l, err := getVolumeDriver(volume.DefaultDriverName)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, m := range container.MountPoints {
|
|
if m.Driver != volume.DefaultDriverName {
|
|
continue
|
|
}
|
|
dataPath := l.(*local.Root).DataPath(m.Name)
|
|
volumePath := filepath.Dir(dataPath)
|
|
|
|
d, err := ioutil.ReadDir(volumePath)
|
|
if err != nil {
|
|
// If the volume directory doesn't exist yet it will be recreated,
|
|
// so we only return the error when there is a different issue.
|
|
if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
// Do not check when the volume directory does not exist.
|
|
continue
|
|
}
|
|
if validVolumeLayout(d) {
|
|
continue
|
|
}
|
|
|
|
if err := os.Mkdir(dataPath, 0755); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Move data inside the data directory
|
|
for _, f := range d {
|
|
oldp := filepath.Join(volumePath, f.Name())
|
|
newp := filepath.Join(dataPath, f.Name())
|
|
if err := os.Rename(oldp, newp); err != nil {
|
|
logrus.Errorf("Unable to move %s to %s\n", oldp, newp)
|
|
}
|
|
}
|
|
}
|
|
|
|
return container.ToDisk()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func createVolume(name, driverName string) (volume.Volume, error) {
|
|
vd, err := getVolumeDriver(driverName)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return vd.Create(name)
|
|
}
|
|
|
|
func removeVolume(v volume.Volume) error {
|
|
vd, err := getVolumeDriver(v.DriverName())
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return vd.Remove(v)
|
|
}
|