mirror of
https://github.com/moby/moby.git
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299 lines
8.4 KiB
Go
299 lines
8.4 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"context"
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"os"
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"path/filepath"
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"strings"
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"time"
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containertypes "github.com/docker/docker/api/types/container"
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"github.com/docker/docker/api/types/mount"
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mounttypes "github.com/docker/docker/api/types/mount"
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volumetypes "github.com/docker/docker/api/types/volume"
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"github.com/docker/docker/container"
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"github.com/docker/docker/errdefs"
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"github.com/docker/docker/volume"
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volumemounts "github.com/docker/docker/volume/mounts"
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"github.com/docker/docker/volume/service"
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volumeopts "github.com/docker/docker/volume/service/opts"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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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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// 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]*volumemounts.MountPoint{}
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parser := volumemounts.NewParser()
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ctx := context.TODO()
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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.Release(ctx, m.Volume.Name(), container.ID)
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}
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}
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}()
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dereferenceIfExists := func(destination string) {
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if v, ok := mountPoints[destination]; ok {
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logrus.Debugf("Duplicate mount point '%s'", destination)
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if v.Volume != nil {
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daemon.volumes.Release(ctx, v.Volume.Name(), 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 := parser.ParseVolumesFrom(v)
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if err != nil {
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return errdefs.InvalidParameter(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 errdefs.InvalidParameter(err)
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}
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for _, m := range c.MountPoints {
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cp := &volumemounts.MountPoint{
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Type: m.Type,
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Name: m.Name,
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Source: m.Source,
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RW: m.RW && parser.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.Get(ctx, cp.Name, volumeopts.WithGetDriver(cp.Driver), volumeopts.WithGetReference(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 = &volumeWrapper{v: v, s: daemon.volumes}
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}
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dereferenceIfExists(cp.Destination)
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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 := parser.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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needsSlavePropagation, err := daemon.validateBindDaemonRoot(bind.Spec)
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if err != nil {
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return err
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}
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if needsSlavePropagation {
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bind.Propagation = mount.PropagationRSlave
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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 duplicateMountPointError(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.Create(ctx, bind.Name, bind.Driver, volumeopts.WithCreateReference(container.ID))
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if err != nil {
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return err
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}
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bind.Volume = &volumeWrapper{v: v, s: daemon.volumes}
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bind.Source = v.Mountpoint
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// bind.Name is an already existing volume, we need to use that here
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bind.Driver = v.Driver
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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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dereferenceIfExists(bind.Destination)
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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 := parser.ParseMountSpec(cfg)
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if err != nil {
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return errdefs.InvalidParameter(err)
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}
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needsSlavePropagation, err := daemon.validateBindDaemonRoot(mp.Spec)
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if err != nil {
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return err
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}
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if needsSlavePropagation {
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mp.Propagation = mount.PropagationRSlave
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}
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if binds[mp.Destination] {
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return duplicateMountPointError(cfg.Target)
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}
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if mp.Type == mounttypes.TypeVolume {
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var v *volumetypes.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.Create(ctx,
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mp.Name,
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mp.Driver,
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volumeopts.WithCreateReference(container.ID),
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volumeopts.WithCreateOptions(driverOpts),
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volumeopts.WithCreateLabels(cfg.VolumeOptions.Labels),
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)
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} else {
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v, err = daemon.volumes.Create(ctx, mp.Name, mp.Driver, volumeopts.WithCreateReference(container.ID))
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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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mp.Volume = &volumeWrapper{v: v, s: daemon.volumes}
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mp.Name = v.Name
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mp.Driver = v.Driver
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// need to selinux-relabel local mounts
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mp.Source = v.Mountpoint
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if mp.Driver == volume.DefaultDriverName {
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setBindModeIfNull(mp)
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}
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}
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if mp.Type == mounttypes.TypeBind && (cfg.BindOptions == nil || !cfg.BindOptions.CreateMountpoint) {
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mp.SkipMountpointCreation = true
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}
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binds[mp.Destination] = true
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dereferenceIfExists(mp.Destination)
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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 parser.IsBackwardCompatible(m) {
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if mp, exists := container.MountPoints[m.Destination]; exists && mp.Volume != nil {
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daemon.volumes.Release(ctx, mp.Volume.Name(), 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 *volumemounts.MountPoint) error {
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if len(m.Driver) > 0 && m.Volume == nil {
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v, err := daemon.volumes.Get(context.TODO(), m.Name, volumeopts.WithGetDriver(m.Driver), volumeopts.WithGetReference(containerID))
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if err != nil {
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return err
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}
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m.Volume = &volumeWrapper{v: v, s: daemon.volumes}
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}
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return nil
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}
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// VolumesService is used to perform volume operations
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func (daemon *Daemon) VolumesService() *service.VolumesService {
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return daemon.volumes
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}
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type volumeMounter interface {
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Mount(ctx context.Context, v *volumetypes.Volume, ref string) (string, error)
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Unmount(ctx context.Context, v *volumetypes.Volume, ref string) error
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}
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type volumeWrapper struct {
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v *volumetypes.Volume
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s volumeMounter
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}
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func (v *volumeWrapper) Name() string {
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return v.v.Name
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}
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func (v *volumeWrapper) DriverName() string {
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return v.v.Driver
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}
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func (v *volumeWrapper) Path() string {
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return v.v.Mountpoint
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}
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func (v *volumeWrapper) Mount(ref string) (string, error) {
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return v.s.Mount(context.TODO(), v.v, ref)
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}
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func (v *volumeWrapper) Unmount(ref string) error {
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return v.s.Unmount(context.TODO(), v.v, ref)
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}
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func (v *volumeWrapper) CreatedAt() (time.Time, error) {
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return time.Time{}, errors.New("not implemented")
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}
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func (v *volumeWrapper) Status() map[string]interface{} {
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return v.v.Status
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}
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