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moby--moby/volume/volume.go

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package volume
import (
"os"
"runtime"
"strings"
"github.com/Sirupsen/logrus"
derr "github.com/docker/docker/errors"
"github.com/docker/docker/pkg/system"
)
// DefaultDriverName is the driver name used for the driver
// implemented in the local package.
const DefaultDriverName string = "local"
// Driver is for creating and removing volumes.
type Driver interface {
// Name returns the name of the volume driver.
Name() string
// Create makes a new volume with the given id.
Create(name string, opts map[string]string) (Volume, error)
// Remove deletes the volume.
Remove(vol Volume) (err error)
// List lists all the volumes the driver has
List() ([]Volume, error)
// Get retreives the volume with the requested name
Get(name string) (Volume, error)
}
// Volume is a place to store data. It is backed by a specific driver, and can be mounted.
type Volume interface {
// Name returns the name of the volume
Name() string
// DriverName returns the name of the driver which owns this volume.
DriverName() string
// Path returns the absolute path to the volume.
Path() string
// Mount mounts the volume and returns the absolute path to
// where it can be consumed.
Mount() (string, error)
// Unmount unmounts the volume when it is no longer in use.
Unmount() error
}
// MountPoint is the intersection point between a volume and a container. It
// specifies which volume is to be used and where inside a container it should
// be mounted.
type MountPoint struct {
Source string // Container host directory
Destination string // Inside the container
RW bool // True if writable
Name string // Name set by user
Driver string // Volume driver to use
Volume Volume `json:"-"`
// Note Mode is not used on Windows
Mode string `json:"Relabel"` // Originally field was `Relabel`"
// Note Propagation is not used on Windows
Propagation string // Mount propagation string
}
// Setup sets up a mount point by either mounting the volume if it is
// configured, or creating the source directory if supplied.
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 runtime.GOOS != "windows" { // Windows does not have deprecation issues here
logrus.Warnf("Auto-creating non-existent volume host path %s, this is deprecated and will be removed soon", m.Source)
if err := system.MkdirAll(m.Source, 0755); err != nil {
return "", err
}
}
}
return m.Source, nil
}
return "", derr.ErrorCodeMountSetup
}
// Path returns the path of a volume in a mount point.
func (m *MountPoint) Path() string {
if m.Volume != nil {
return m.Volume.Path()
}
return m.Source
}
// ParseVolumesFrom ensure that the supplied volumes-from is valid.
func ParseVolumesFrom(spec string) (string, string, error) {
if len(spec) == 0 {
return "", "", derr.ErrorCodeVolumeFromBlank.WithArgs(spec)
}
specParts := strings.SplitN(spec, ":", 2)
id := specParts[0]
mode := "rw"
if len(specParts) == 2 {
mode = specParts[1]
if !ValidMountMode(mode) {
return "", "", derr.ErrorCodeVolumeInvalidMode.WithArgs(mode)
}
// For now don't allow propagation properties while importing
// volumes from data container. These volumes will inherit
// the same propagation property as of the original volume
// in data container. This probably can be relaxed in future.
if HasPropagation(mode) {
return "", "", derr.ErrorCodeVolumeInvalidMode.WithArgs(mode)
}
}
return id, mode, nil
}