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