2015-12-30 18:18:30 -05:00
|
|
|
// +build linux freebsd darwin solaris
|
2015-09-09 22:23:06 -04:00
|
|
|
|
|
|
|
package volume
|
|
|
|
|
|
|
|
import (
|
|
|
|
"fmt"
|
|
|
|
"path/filepath"
|
|
|
|
"strings"
|
|
|
|
|
|
|
|
derr "github.com/docker/docker/errors"
|
|
|
|
)
|
|
|
|
|
|
|
|
// read-write modes
|
|
|
|
var rwModes = map[string]bool{
|
2015-10-23 16:57:57 -04:00
|
|
|
"rw": true,
|
|
|
|
"ro": true,
|
2015-09-09 22:23:06 -04:00
|
|
|
}
|
|
|
|
|
2015-10-23 16:57:57 -04:00
|
|
|
// label modes
|
|
|
|
var labelModes = map[string]bool{
|
|
|
|
"Z": true,
|
|
|
|
"z": true,
|
2015-09-09 22:23:06 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
// 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 == DefaultDriverName
|
|
|
|
}
|
|
|
|
|
|
|
|
// HasResource checks whether the given absolute path for a container is in
|
|
|
|
// this mount point. If the relative path starts with `../` then the resource
|
|
|
|
// is outside of this mount point, but we can't simply check for this prefix
|
|
|
|
// because it misses `..` which is also outside of the mount, so check both.
|
|
|
|
func (m *MountPoint) HasResource(absolutePath string) bool {
|
|
|
|
relPath, err := filepath.Rel(m.Destination, absolutePath)
|
|
|
|
return err == nil && relPath != ".." && !strings.HasPrefix(relPath, fmt.Sprintf("..%c", filepath.Separator))
|
|
|
|
}
|
|
|
|
|
|
|
|
// ParseMountSpec validates the configuration of mount information is valid.
|
|
|
|
func ParseMountSpec(spec, volumeDriver string) (*MountPoint, error) {
|
|
|
|
spec = filepath.ToSlash(spec)
|
|
|
|
|
|
|
|
mp := &MountPoint{
|
2015-10-23 16:57:57 -04:00
|
|
|
RW: true,
|
|
|
|
Propagation: DefaultPropagationMode,
|
2015-09-09 22:23:06 -04:00
|
|
|
}
|
|
|
|
if strings.Count(spec, ":") > 2 {
|
|
|
|
return nil, derr.ErrorCodeVolumeInvalid.WithArgs(spec)
|
|
|
|
}
|
|
|
|
|
|
|
|
arr := strings.SplitN(spec, ":", 3)
|
|
|
|
if arr[0] == "" {
|
|
|
|
return nil, derr.ErrorCodeVolumeInvalid.WithArgs(spec)
|
|
|
|
}
|
|
|
|
|
|
|
|
switch len(arr) {
|
|
|
|
case 1:
|
|
|
|
// Just a destination path in the container
|
|
|
|
mp.Destination = filepath.Clean(arr[0])
|
|
|
|
case 2:
|
|
|
|
if isValid := ValidMountMode(arr[1]); isValid {
|
|
|
|
// Destination + Mode is not a valid volume - volumes
|
|
|
|
// cannot include a mode. eg /foo:rw
|
|
|
|
return nil, derr.ErrorCodeVolumeInvalid.WithArgs(spec)
|
|
|
|
}
|
|
|
|
// Host Source Path or Name + Destination
|
|
|
|
mp.Source = arr[0]
|
|
|
|
mp.Destination = arr[1]
|
|
|
|
case 3:
|
|
|
|
// HostSourcePath+DestinationPath+Mode
|
|
|
|
mp.Source = arr[0]
|
|
|
|
mp.Destination = arr[1]
|
|
|
|
mp.Mode = arr[2] // Mode field is used by SELinux to decide whether to apply label
|
|
|
|
if !ValidMountMode(mp.Mode) {
|
|
|
|
return nil, derr.ErrorCodeVolumeInvalidMode.WithArgs(mp.Mode)
|
|
|
|
}
|
|
|
|
mp.RW = ReadWrite(mp.Mode)
|
2015-10-23 16:57:57 -04:00
|
|
|
mp.Propagation = GetPropagation(mp.Mode)
|
2015-09-09 22:23:06 -04:00
|
|
|
default:
|
|
|
|
return nil, derr.ErrorCodeVolumeInvalid.WithArgs(spec)
|
|
|
|
}
|
|
|
|
|
|
|
|
//validate the volumes destination path
|
|
|
|
mp.Destination = filepath.Clean(mp.Destination)
|
|
|
|
if !filepath.IsAbs(mp.Destination) {
|
|
|
|
return nil, derr.ErrorCodeVolumeAbs.WithArgs(mp.Destination)
|
|
|
|
}
|
|
|
|
|
|
|
|
// Destination cannot be "/"
|
|
|
|
if mp.Destination == "/" {
|
|
|
|
return nil, derr.ErrorCodeVolumeSlash.WithArgs(spec)
|
|
|
|
}
|
|
|
|
|
|
|
|
name, source := ParseVolumeSource(mp.Source)
|
|
|
|
if len(source) == 0 {
|
|
|
|
mp.Source = "" // Clear it out as we previously assumed it was not a name
|
|
|
|
mp.Driver = volumeDriver
|
|
|
|
if len(mp.Driver) == 0 {
|
|
|
|
mp.Driver = DefaultDriverName
|
|
|
|
}
|
2015-10-23 16:57:57 -04:00
|
|
|
// Named volumes can't have propagation properties specified.
|
|
|
|
// Their defaults will be decided by docker. This is just a
|
|
|
|
// safeguard. Don't want to get into situations where named
|
|
|
|
// volumes were mounted as '[r]shared' inside container and
|
|
|
|
// container does further mounts under that volume and these
|
|
|
|
// mounts become visible on host and later original volume
|
|
|
|
// cleanup becomes an issue if container does not unmount
|
|
|
|
// submounts explicitly.
|
|
|
|
if HasPropagation(mp.Mode) {
|
|
|
|
return nil, derr.ErrorCodeVolumeInvalid.WithArgs(spec)
|
|
|
|
}
|
2015-09-09 22:23:06 -04:00
|
|
|
} else {
|
|
|
|
mp.Source = filepath.Clean(source)
|
|
|
|
}
|
|
|
|
|
|
|
|
mp.Name = name
|
|
|
|
|
|
|
|
return mp, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// ParseVolumeSource parses the origin sources that's mounted into the container.
|
|
|
|
// It returns a name and a source. It looks to see if the spec passed in
|
|
|
|
// is an absolute file. If it is, it assumes the spec is a source. If not,
|
|
|
|
// it assumes the spec is a name.
|
|
|
|
func ParseVolumeSource(spec string) (string, string) {
|
|
|
|
if !filepath.IsAbs(spec) {
|
|
|
|
return spec, ""
|
|
|
|
}
|
|
|
|
return "", spec
|
|
|
|
}
|
|
|
|
|
|
|
|
// IsVolumeNameValid checks a volume name in a platform specific manner.
|
|
|
|
func IsVolumeNameValid(name string) (bool, error) {
|
|
|
|
return true, nil
|
|
|
|
}
|
2015-10-23 16:57:57 -04:00
|
|
|
|
|
|
|
// ValidMountMode will make sure the mount mode is valid.
|
|
|
|
// returns if it's a valid mount mode or not.
|
|
|
|
func ValidMountMode(mode string) bool {
|
|
|
|
rwModeCount := 0
|
|
|
|
labelModeCount := 0
|
|
|
|
propagationModeCount := 0
|
|
|
|
|
|
|
|
for _, o := range strings.Split(mode, ",") {
|
|
|
|
if rwModes[o] {
|
|
|
|
rwModeCount++
|
|
|
|
continue
|
|
|
|
} else if labelModes[o] {
|
|
|
|
labelModeCount++
|
|
|
|
continue
|
|
|
|
} else if propagationModes[o] {
|
|
|
|
propagationModeCount++
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
// Only one string for each mode is allowed.
|
|
|
|
if rwModeCount > 1 || labelModeCount > 1 || propagationModeCount > 1 {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
|
|
|
|
// ReadWrite tells you if a mode string is a valid read-write mode or not.
|
|
|
|
// If there are no specifications w.r.t read write mode, then by default
|
|
|
|
// it returs true.
|
|
|
|
func ReadWrite(mode string) bool {
|
|
|
|
if !ValidMountMode(mode) {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
for _, o := range strings.Split(mode, ",") {
|
|
|
|
if o == "ro" {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return true
|
|
|
|
}
|