Windows: Remove TP5 hack from graphdriver

Signed-off-by: John Howard <jhoward@microsoft.com>

daemon/graphdriver/windows/windows.go

@@ -30,7 +30,6 @@ import (
 	"github.com/docker/docker/pkg/ioutils"
 	"github.com/docker/docker/pkg/longpath"
 	"github.com/docker/docker/pkg/reexec"
-	"github.com/docker/docker/pkg/system"
 	"github.com/docker/go-units"
 	"github.com/vbatts/tar-split/tar/storage"
 )
@@ -68,10 +67,6 @@ type Driver struct {
 	cache   map[string]string
 }
 
-func isTP5OrOlder() bool {
-	return system.GetOSVersion().Build <= 14300
-}
-
 // InitFilter returns a new Windows storage filter driver.
 func InitFilter(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
 	logrus.Debugf("WindowsGraphDriver InitFilter at %s", home)
@@ -200,29 +195,6 @@ func (d *Driver) create(id, parent, mountLabel string, readOnly bool, storageOpt
 			parentPath = layerChain[0]
 		}
 
-		if isTP5OrOlder() {
-			// Pre-create the layer directory, providing an ACL to give the Hyper-V Virtual Machines
-			// group access. This is necessary to ensure that Hyper-V containers can access the
-			// virtual machine data. This is not necessary post-TP5.
-			path, err := syscall.UTF16FromString(filepath.Join(d.info.HomeDir, id))
-			if err != nil {
-				return err
-			}
-			// Give system and administrators full control, and VMs read, write, and execute.
-			// Mark these ACEs as inherited.
-			sd, err := winio.SddlToSecurityDescriptor("D:(A;OICI;FA;;;SY)(A;OICI;FA;;;BA)(A;OICI;FRFWFX;;;S-1-5-83-0)")
-			if err != nil {
-				return err
-			}
-			err = syscall.CreateDirectory(&path[0], &syscall.SecurityAttributes{
-				Length:             uint32(unsafe.Sizeof(syscall.SecurityAttributes{})),
-				SecurityDescriptor: uintptr(unsafe.Pointer(&sd[0])),
-			})
-			if err != nil {
-				return err
-			}
-		}
-
 		if err := hcsshim.CreateSandboxLayer(d.info, id, parentPath, layerChain); err != nil {
 			return err
 		}
@@ -596,23 +568,6 @@ func writeLayerFromTar(r archive.Reader, w hcsshim.LayerWriter) (int64, error) {
 			}
 			buf.Reset(w)
 
-			// Add the Hyper-V Virtual Machine group ACE to the security descriptor
-			// for TP5 so that Xenons can access all files. This is not necessary
-			// for post-TP5 builds.
-			if isTP5OrOlder() {
-				if sddl, ok := hdr.Winheaders["sd"]; ok {
-					var ace string
-					if hdr.Typeflag == tar.TypeDir {
-						ace = "(A;OICI;0x1200a9;;;S-1-5-83-0)"
-					} else {
-						ace = "(A;;0x1200a9;;;S-1-5-83-0)"
-					}
-					if hdr.Winheaders["sd"], ok = addAceToSddlDacl(sddl, ace); !ok {
-						logrus.Debugf("failed to add VM ACE to %s", sddl)
-					}
-				}
-			}
-
 			hdr, err = backuptar.WriteBackupStreamFromTarFile(buf, t, hdr)
 			ferr := buf.Flush()
 			if ferr != nil {