mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
314 lines
8.5 KiB
Go
314 lines
8.5 KiB
Go
package daemon
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
dockererrors "github.com/docker/docker/api/errors"
|
|
"github.com/docker/docker/api/types"
|
|
containertypes "github.com/docker/docker/api/types/container"
|
|
mounttypes "github.com/docker/docker/api/types/mount"
|
|
"github.com/docker/docker/container"
|
|
"github.com/docker/docker/volume"
|
|
"github.com/docker/docker/volume/drivers"
|
|
"github.com/opencontainers/runc/libcontainer/label"
|
|
)
|
|
|
|
var (
|
|
// ErrVolumeReadonly is used to signal an error when trying to copy data into
|
|
// a volume mount that is not writable.
|
|
ErrVolumeReadonly = errors.New("mounted volume is marked read-only")
|
|
)
|
|
|
|
type mounts []container.Mount
|
|
|
|
// volumeToAPIType converts a volume.Volume to the type used by the Engine API
|
|
func volumeToAPIType(v volume.Volume) *types.Volume {
|
|
tv := &types.Volume{
|
|
Name: v.Name(),
|
|
Driver: v.DriverName(),
|
|
}
|
|
if v, ok := v.(volume.DetailedVolume); ok {
|
|
tv.Labels = v.Labels()
|
|
tv.Options = v.Options()
|
|
tv.Scope = v.Scope()
|
|
}
|
|
|
|
return tv
|
|
}
|
|
|
|
// Len returns the number of mounts. Used in sorting.
|
|
func (m mounts) Len() int {
|
|
return len(m)
|
|
}
|
|
|
|
// Less returns true if the number of parts (a/b/c would be 3 parts) in the
|
|
// mount indexed by parameter 1 is less than that of the mount indexed by
|
|
// parameter 2. Used in sorting.
|
|
func (m mounts) Less(i, j int) bool {
|
|
return m.parts(i) < m.parts(j)
|
|
}
|
|
|
|
// Swap swaps two items in an array of mounts. Used in sorting
|
|
func (m mounts) Swap(i, j int) {
|
|
m[i], m[j] = m[j], m[i]
|
|
}
|
|
|
|
// parts returns the number of parts in the destination of a mount. Used in sorting.
|
|
func (m mounts) parts(i int) int {
|
|
return strings.Count(filepath.Clean(m[i].Destination), string(os.PathSeparator))
|
|
}
|
|
|
|
// 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.
|
|
// 4. Cleanup old volumes that are about to be reassigned.
|
|
func (daemon *Daemon) registerMountPoints(container *container.Container, hostConfig *containertypes.HostConfig) (retErr error) {
|
|
binds := map[string]bool{}
|
|
mountPoints := map[string]*volume.MountPoint{}
|
|
defer func() {
|
|
// clean up the container mountpoints once return with error
|
|
if retErr != nil {
|
|
for _, m := range mountPoints {
|
|
if m.Volume == nil {
|
|
continue
|
|
}
|
|
daemon.volumes.Dereference(m.Volume, container.ID)
|
|
}
|
|
}
|
|
}()
|
|
|
|
dereferenceIfExists := func(destination string) {
|
|
if v, ok := mountPoints[destination]; ok {
|
|
logrus.Debugf("Duplicate mount point '%s'", destination)
|
|
if v.Volume != nil {
|
|
daemon.volumes.Dereference(v.Volume, container.ID)
|
|
}
|
|
}
|
|
}
|
|
|
|
// 1. Read already configured mount points.
|
|
for destination, point := range container.MountPoints {
|
|
mountPoints[destination] = point
|
|
}
|
|
|
|
// 2. Read volumes from other containers.
|
|
for _, v := range hostConfig.VolumesFrom {
|
|
containerID, mode, err := volume.ParseVolumesFrom(v)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c, err := daemon.GetContainer(containerID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, m := range c.MountPoints {
|
|
cp := &volume.MountPoint{
|
|
Name: m.Name,
|
|
Source: m.Source,
|
|
RW: m.RW && volume.ReadWrite(mode),
|
|
Driver: m.Driver,
|
|
Destination: m.Destination,
|
|
Propagation: m.Propagation,
|
|
Spec: m.Spec,
|
|
CopyData: false,
|
|
}
|
|
|
|
if len(cp.Source) == 0 {
|
|
v, err := daemon.volumes.GetWithRef(cp.Name, cp.Driver, container.ID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
cp.Volume = v
|
|
}
|
|
dereferenceIfExists(cp.Destination)
|
|
mountPoints[cp.Destination] = cp
|
|
}
|
|
}
|
|
|
|
// 3. Read bind mounts
|
|
for _, b := range hostConfig.Binds {
|
|
bind, err := volume.ParseMountRaw(b, hostConfig.VolumeDriver)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// #10618
|
|
_, tmpfsExists := hostConfig.Tmpfs[bind.Destination]
|
|
if binds[bind.Destination] || tmpfsExists {
|
|
return fmt.Errorf("Duplicate mount point '%s'", bind.Destination)
|
|
}
|
|
|
|
if bind.Type == mounttypes.TypeVolume {
|
|
// create the volume
|
|
v, err := daemon.volumes.CreateWithRef(bind.Name, bind.Driver, container.ID, nil, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
bind.Volume = v
|
|
bind.Source = v.Path()
|
|
// bind.Name is an already existing volume, we need to use that here
|
|
bind.Driver = v.DriverName()
|
|
if bind.Driver == volume.DefaultDriverName {
|
|
setBindModeIfNull(bind)
|
|
}
|
|
}
|
|
|
|
binds[bind.Destination] = true
|
|
dereferenceIfExists(bind.Destination)
|
|
mountPoints[bind.Destination] = bind
|
|
}
|
|
|
|
for _, cfg := range hostConfig.Mounts {
|
|
mp, err := volume.ParseMountSpec(cfg)
|
|
if err != nil {
|
|
return dockererrors.NewBadRequestError(err)
|
|
}
|
|
|
|
if binds[mp.Destination] {
|
|
return fmt.Errorf("Duplicate mount point '%s'", cfg.Target)
|
|
}
|
|
|
|
if mp.Type == mounttypes.TypeVolume {
|
|
var v volume.Volume
|
|
if cfg.VolumeOptions != nil {
|
|
var driverOpts map[string]string
|
|
if cfg.VolumeOptions.DriverConfig != nil {
|
|
driverOpts = cfg.VolumeOptions.DriverConfig.Options
|
|
}
|
|
v, err = daemon.volumes.CreateWithRef(mp.Name, mp.Driver, container.ID, driverOpts, cfg.VolumeOptions.Labels)
|
|
} else {
|
|
v, err = daemon.volumes.CreateWithRef(mp.Name, mp.Driver, container.ID, nil, nil)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := label.Relabel(mp.Source, container.MountLabel, false); err != nil {
|
|
return err
|
|
}
|
|
mp.Volume = v
|
|
mp.Name = v.Name()
|
|
mp.Driver = v.DriverName()
|
|
|
|
// only use the cached path here since getting the path is not necessary right now and calling `Path()` may be slow
|
|
if cv, ok := v.(interface {
|
|
CachedPath() string
|
|
}); ok {
|
|
mp.Source = cv.CachedPath()
|
|
}
|
|
}
|
|
|
|
binds[mp.Destination] = true
|
|
dereferenceIfExists(mp.Destination)
|
|
mountPoints[mp.Destination] = mp
|
|
}
|
|
|
|
container.Lock()
|
|
|
|
// 4. Cleanup old volumes that are about to be reassigned.
|
|
for _, m := range mountPoints {
|
|
if m.BackwardsCompatible() {
|
|
if mp, exists := container.MountPoints[m.Destination]; exists && mp.Volume != nil {
|
|
daemon.volumes.Dereference(mp.Volume, container.ID)
|
|
}
|
|
}
|
|
}
|
|
container.MountPoints = mountPoints
|
|
|
|
container.Unlock()
|
|
|
|
return nil
|
|
}
|
|
|
|
// lazyInitializeVolume initializes a mountpoint's volume if needed.
|
|
// This happens after a daemon restart.
|
|
func (daemon *Daemon) lazyInitializeVolume(containerID string, m *volume.MountPoint) error {
|
|
if len(m.Driver) > 0 && m.Volume == nil {
|
|
v, err := daemon.volumes.GetWithRef(m.Name, m.Driver, containerID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
m.Volume = v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func backportMountSpec(container *container.Container) error {
|
|
for target, m := range container.MountPoints {
|
|
if m.Spec.Type != "" {
|
|
// if type is set on even one mount, no need to migrate
|
|
return nil
|
|
}
|
|
if m.Name != "" {
|
|
m.Type = mounttypes.TypeVolume
|
|
m.Spec.Type = mounttypes.TypeVolume
|
|
|
|
// make sure this is not an anonymous volume before setting the spec source
|
|
if _, exists := container.Config.Volumes[target]; !exists {
|
|
m.Spec.Source = m.Name
|
|
}
|
|
if container.HostConfig.VolumeDriver != "" {
|
|
m.Spec.VolumeOptions = &mounttypes.VolumeOptions{
|
|
DriverConfig: &mounttypes.Driver{Name: container.HostConfig.VolumeDriver},
|
|
}
|
|
}
|
|
if strings.Contains(m.Mode, "nocopy") {
|
|
if m.Spec.VolumeOptions == nil {
|
|
m.Spec.VolumeOptions = &mounttypes.VolumeOptions{}
|
|
}
|
|
m.Spec.VolumeOptions.NoCopy = true
|
|
}
|
|
} else {
|
|
m.Type = mounttypes.TypeBind
|
|
m.Spec.Type = mounttypes.TypeBind
|
|
m.Spec.Source = m.Source
|
|
if m.Propagation != "" {
|
|
m.Spec.BindOptions = &mounttypes.BindOptions{
|
|
Propagation: m.Propagation,
|
|
}
|
|
}
|
|
}
|
|
|
|
m.Spec.Target = m.Destination
|
|
if !m.RW {
|
|
m.Spec.ReadOnly = true
|
|
}
|
|
}
|
|
return container.ToDiskLocking()
|
|
}
|
|
|
|
func (daemon *Daemon) traverseLocalVolumes(fn func(volume.Volume) error) error {
|
|
localVolumeDriver, err := volumedrivers.GetDriver(volume.DefaultDriverName)
|
|
if err != nil {
|
|
return fmt.Errorf("can't retrieve local volume driver: %v", err)
|
|
}
|
|
vols, err := localVolumeDriver.List()
|
|
if err != nil {
|
|
return fmt.Errorf("can't retrieve local volumes: %v", err)
|
|
}
|
|
|
|
for _, v := range vols {
|
|
name := v.Name()
|
|
_, err := daemon.volumes.Get(name)
|
|
if err != nil {
|
|
logrus.Warnf("failed to retrieve volume %s from store: %v", name, err)
|
|
}
|
|
|
|
err = fn(v)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|