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moby--moby/volume/volume_windows.go

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package volume
import (
"os"
"path/filepath"
"regexp"
"strings"
"github.com/Sirupsen/logrus"
derr "github.com/docker/docker/errors"
)
// read-write modes
var rwModes = map[string]bool{
"rw": true,
}
// read-only modes
var roModes = map[string]bool{
"ro": true,
}
const (
// Spec should be in the format [source:]destination[:mode]
//
// Examples: c:\foo bar:d:rw
// c:\foo:d:\bar
// myname:d:
// d:\
//
// Explanation of this regex! Thanks @thaJeztah on IRC and gist for help. See
// https://gist.github.com/thaJeztah/6185659e4978789fb2b2. A good place to
// test is https://regex-golang.appspot.com/assets/html/index.html
//
// Useful link for referencing named capturing groups:
// http://stackoverflow.com/questions/20750843/using-named-matches-from-go-regex
//
// There are three match groups: source, destination and mode.
//
// RXHostDir is the first option of a source
RXHostDir = `[a-z]:\\(?:[^\\/:*?"<>|\r\n]+\\?)*`
// RXName is the second option of a source
RXName = `[^\\/:*?"<>|\r\n]+`
// RXReservedNames are reserved names not possible on Windows
RXReservedNames = `(con)|(prn)|(nul)|(aux)|(com[1-9])|(lpt[1-9])`
// RXSource is the combined possibilities for a source
RXSource = `((?P<source>((` + RXHostDir + `)|(` + RXName + `))):)?`
// Source. Can be either a host directory, a name, or omitted:
// HostDir:
// - Essentially using the folder solution from
// https://www.safaribooksonline.com/library/view/regular-expressions-cookbook/9781449327453/ch08s18.html
// but adding case insensitivity.
// - Must be an absolute path such as c:\path
// - Can include spaces such as `c:\program files`
// - And then followed by a colon which is not in the capture group
// - And can be optional
// Name:
// - Must not contain invalid NTFS filename characters (https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx)
// - And then followed by a colon which is not in the capture group
// - And can be optional
// RXDestination is the regex expression for the mount destination
RXDestination = `(?P<destination>([a-z]):((?:\\[^\\/:*?"<>\r\n]+)*\\?))`
// Destination (aka container path):
// - Variation on hostdir but can be a drive followed by colon as well
// - If a path, must be absolute. Can include spaces
// - Drive cannot be c: (explicitly checked in code, not RegEx)
//
// RXMode is the regex expression for the mode of the mount
RXMode = `(:(?P<mode>(?i)rw))?`
// Temporarily for TP4, disabling the use of ro as it's not supported yet
// in the platform. TODO Windows: `(:(?P<mode>(?i)ro|rw))?`
// mode (optional)
// - Hopefully self explanatory in comparison to above.
// - Colon is not in the capture group
//
)
// BackwardsCompatible decides whether this mount point can be
// used in old versions of Docker or not.
// Windows volumes are never backwards compatible.
func (m *MountPoint) BackwardsCompatible() bool {
return false
}
// ParseMountSpec validates the configuration of mount information is valid.
func ParseMountSpec(spec string, volumeDriver string) (*MountPoint, error) {
var specExp = regexp.MustCompile(`^` + RXSource + RXDestination + RXMode + `$`)
// Ensure in platform semantics for matching. The CLI will send in Unix semantics.
match := specExp.FindStringSubmatch(filepath.FromSlash(strings.ToLower(spec)))
// Must have something back
if len(match) == 0 {
return nil, derr.ErrorCodeVolumeInvalid.WithArgs(spec)
}
// Pull out the sub expressions from the named capture groups
matchgroups := make(map[string]string)
for i, name := range specExp.SubexpNames() {
matchgroups[name] = strings.ToLower(match[i])
}
mp := &MountPoint{
Source: matchgroups["source"],
Destination: matchgroups["destination"],
RW: true,
}
if strings.ToLower(matchgroups["mode"]) == "ro" {
mp.RW = false
}
// Volumes cannot include an explicitly supplied mode eg c:\path:rw
if mp.Source == "" && mp.Destination != "" && matchgroups["mode"] != "" {
return nil, derr.ErrorCodeVolumeInvalid.WithArgs(spec)
}
// Note: No need to check if destination is absolute as it must be by
// definition of matching the regex.
if filepath.VolumeName(mp.Destination) == mp.Destination {
// Ensure the destination path, if a drive letter, is not the c drive
if strings.ToLower(mp.Destination) == "c:" {
return nil, derr.ErrorCodeVolumeDestIsC.WithArgs(spec)
}
} else {
// So we know the destination is a path, not drive letter. Clean it up.
mp.Destination = filepath.Clean(mp.Destination)
// Ensure the destination path, if a path, is not the c root directory
if strings.ToLower(mp.Destination) == `c:\` {
return nil, derr.ErrorCodeVolumeDestIsCRoot.WithArgs(spec)
}
}
// See if the source is a name instead of a host directory
if len(mp.Source) > 0 {
validName, err := IsVolumeNameValid(mp.Source)
if err != nil {
return nil, err
}
if validName {
// OK, so the source is a name.
mp.Name = mp.Source
mp.Source = ""
// Set the driver accordingly
mp.Driver = volumeDriver
if len(mp.Driver) == 0 {
mp.Driver = DefaultDriverName
}
} else {
// OK, so the source must be a host directory. Make sure it's clean.
mp.Source = filepath.Clean(mp.Source)
}
}
// Ensure the host path source, if supplied, exists and is a directory
if len(mp.Source) > 0 {
var fi os.FileInfo
var err error
if fi, err = os.Stat(mp.Source); err != nil {
return nil, derr.ErrorCodeVolumeSourceNotFound.WithArgs(mp.Source, err)
}
if !fi.IsDir() {
return nil, derr.ErrorCodeVolumeSourceNotDirectory.WithArgs(mp.Source)
}
}
logrus.Debugf("MP: Source '%s', Dest '%s', RW %t, Name '%s', Driver '%s'", mp.Source, mp.Destination, mp.RW, mp.Name, mp.Driver)
return mp, nil
}
// IsVolumeNameValid checks a volume name in a platform specific manner.
func IsVolumeNameValid(name string) (bool, error) {
nameExp := regexp.MustCompile(`^` + RXName + `$`)
if !nameExp.MatchString(name) {
return false, nil
}
nameExp = regexp.MustCompile(`^` + RXReservedNames + `$`)
if nameExp.MatchString(name) {
return false, derr.ErrorCodeVolumeNameReservedWord.WithArgs(name)
}
return true, nil
}
// ValidMountMode will make sure the mount mode is valid.
// returns if it's a valid mount mode or not.
func ValidMountMode(mode string) bool {
return roModes[strings.ToLower(mode)] || rwModes[strings.ToLower(mode)]
}
// ReadWrite tells you if a mode string is a valid read-write mode or not.
func ReadWrite(mode string) bool {
return rwModes[strings.ToLower(mode)]
}