Windows: Docker build starting to work

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

chrootarchive/diff_windows.go

@@ -0,0 +1,32 @@
+package chrootarchive
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/docker/docker/pkg/archive"
+)
+
+func ApplyLayer(dest string, layer archive.ArchiveReader) (size int64, err error) {
+	dest = filepath.Clean(dest)
+	decompressed, err := archive.DecompressStream(layer)
+	if err != nil {
+		return 0, err
+	}
+	defer decompressed.Close()
+
+	tmpDir, err := ioutil.TempDir(os.Getenv("temp"), "temp-docker-extract")
+	if err != nil {
+		return 0, fmt.Errorf("ApplyLayer failed to create temp-docker-extract under %s. %s", dest, err)
+	}
+
+	s, err := archive.UnpackLayer(dest, decompressed)
+	os.RemoveAll(tmpDir)
+	if err != nil {
+		return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s", err, dest)
+	}
+
+	return s, nil
+}