volume/mounts: move some code to correct location, and minor linting/formatting

- Remove the windowsparser.HasResource() override, as it was the same on both
  Windows and Linux
- Move the rxLCOWDestination to the lcowParser code
- Move the rwModes variable to a generic (non-platform-specific) file, as it's
  used both for the windowsParser and the linuxParser
- Some minor formatting and linting changes

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

volume/mounts/lcow_parser.go

@@ -7,6 +7,14 @@ import (
 	"github.com/docker/docker/api/types/mount"
 )
 
+// rxLCOWDestination is the regex expression for the mount destination for LCOW
+//
+// 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)
+const rxLCOWDestination = `(?P<destination>/(?:[^\\/:*?"<>\r\n]+[/]?)*)`
+
 var lcowSpecificValidators mountValidator = func(m *mount.Mount) error {
 	if path.Clean(m.Target) == "/" {
 		return ErrVolumeTargetIsRoot

volume/mounts/linux_parser.go

@@ -12,8 +12,7 @@ import (
 	"github.com/docker/docker/volume"
 )
 
-type linuxParser struct {
-}
+type linuxParser struct{}
 
 func linuxSplitRawSpec(raw string) ([]string, error) {
 	if strings.Count(raw, ":") > 2 {
@@ -115,12 +114,6 @@ func (p *linuxParser) validateMountConfigImpl(mnt *mount.Mount, validateBindSour
 	return nil
 }
 
-// read-write modes
-var rwModes = map[string]bool{
-	"rw": true,
-	"ro": true,
-}
-
 // label modes
 var linuxLabelModes = map[string]bool{
 	"Z": true,

volume/mounts/parser.go

@@ -18,6 +18,12 @@ const (
 // It's used by both LCOW and Linux parsers.
 var ErrVolumeTargetIsRoot = errors.New("invalid specification: destination can't be '/'")
 
+// read-write modes
+var rwModes = map[string]bool{
+	"rw": true,
+	"ro": true,
+}
+
 // Parser represents a platform specific parser for mount expressions
 type Parser interface {
 	ParseMountRaw(raw, volumeDriver string) (*MountPoint, error)

volume/mounts/parser_test.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/docker/docker/api/types/mount"
 	"gotest.tools/v3/assert"
-	"gotest.tools/v3/assert/cmp"
 )
 
 type parseMountRawTestSet struct {
@@ -300,9 +299,7 @@ func TestParseMountRaw(t *testing.T) {
 	winParser := &windowsParser{}
 	lcowParser := &lcowParser{}
 	tester := func(parser Parser, set parseMountRawTestSet) {
-
 		for _, path := range set.valid {
-
 			if _, err := parser.ParseMountRaw(path, "local"); err != nil {
 				t.Errorf("ParseMountRaw(`%q`) should succeed: error %q", path, err)
 			}
@@ -318,10 +315,10 @@ func TestParseMountRaw(t *testing.T) {
 			}
 		}
 	}
+
 	tester(linParser, linuxSet)
 	tester(winParser, windowsSet)
 	tester(lcowParser, lcowSet)
-
 }
 
 // testParseMountRaw is a structure used by TestParseMountRawSplit for
@@ -397,7 +394,7 @@ func TestParseMountRawSplit(t *testing.T) {
 			}
 
 			if m == nil || err != nil {
-				t.Errorf("ParseMountRaw failed for spec '%s', driver '%s', error '%v'", c.bind, c.driver, err.Error())
+				t.Errorf("ParseMountRaw failed for spec '%s', driver '%s', error '%v'", c.bind, c.driver, err)
 				continue
 			}
 
@@ -525,6 +522,5 @@ func TestParseMountSpecBindWithFileinfoError(t *testing.T) {
 	parser := NewParser(runtime.GOOS)
 
 	_, err := parser.ParseMountSpec(m)
-	assert.Assert(t, err != nil)
-	assert.Assert(t, cmp.Contains(err.Error(), "some crazy error"))
+	assert.ErrorContains(t, err, "some crazy error")
 }

volume/mounts/volume_unix.go

@@ -12,7 +12,3 @@ func (p *linuxParser) HasResource(m *MountPoint, absolutePath string) bool {
 	relPath, err := filepath.Rel(m.Destination, absolutePath)
 	return err == nil && relPath != ".." && !strings.HasPrefix(relPath, fmt.Sprintf("..%c", filepath.Separator))
 }
-
-func (p *windowsParser) HasResource(m *MountPoint, absolutePath string) bool {
-	return false
-}

volume/mounts/volume_windows.go

@@ -1,8 +1,5 @@
 package mounts // import "github.com/docker/docker/volume/mounts"
 
-func (p *windowsParser) HasResource(m *MountPoint, absolutePath string) bool {
-	return false
-}
 func (p *linuxParser) HasResource(m *MountPoint, absolutePath string) bool {
 	return false
 }

volume/mounts/windows_parser.go

@@ -12,8 +12,7 @@ import (
 	"github.com/docker/docker/pkg/stringid"
 )
 
-type windowsParser struct {
-}
+type windowsParser struct{}
 
 const (
 	// Spec should be in the format [source:]destination[:mode]
@@ -63,12 +62,6 @@ const (
 	// rxDestination is the regex expression for the mount destination
 	rxDestination = `(?P<destination>((?:\\\\\?\\)?([a-z]):((?:[\\/][^\\/:*?"<>\r\n]+)*[\\/]?))|(` + rxPipe + `))`
 
-	rxLCOWDestination = `(?P<destination>/(?:[^\\/:*?"<>\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
 	// Mode (optional):
 	//    -  Hopefully self explanatory in comparison to above regex's.
@@ -136,8 +129,10 @@ func windowsValidMountMode(mode string) bool {
 	if mode == "" {
 		return true
 	}
+	// TODO should windows mounts produce an error if any mode was provided (they're a no-op on windows)
 	return rwModes[strings.ToLower(mode)]
 }
+
 func windowsValidateNotRoot(p string) error {
 	p = strings.ToLower(strings.Replace(p, `/`, `\`, -1))
 	if p == "c:" || p == `c:\` {
@@ -177,7 +172,7 @@ func (p *windowsParser) ReadWrite(mode string) bool {
 	return strings.ToLower(mode) != "ro"
 }
 
-// IsVolumeNameValid checks a volume name in a platform specific manner.
+// ValidateVolumeName checks a volume name in a platform specific manner.
 func (p *windowsParser) ValidateVolumeName(name string) error {
 	nameExp := regexp.MustCompile(`^` + rxName + `$`)
 	if !nameExp.MatchString(name) {
@@ -454,3 +449,7 @@ func (p *windowsParser) IsBackwardCompatible(m *MountPoint) bool {
 func (p *windowsParser) ValidateTmpfsMountDestination(dest string) error {
 	return errors.New("Platform does not support tmpfs")
 }
+
+func (p *windowsParser) HasResource(m *MountPoint, absolutePath string) bool {
+	return false
+}