Windows: Factoring out unused fields

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

daemon/archive_unix.go

@@ -0,0 +1,19 @@
+// +build !windows
+
+package daemon
+
+// checkIfPathIsInAVolume checks if the path is in a volume. If it is, it
+// cannot be in a read-only volume. If it  is not in a volume, the container
+// cannot be configured with a read-only rootfs.
+func checkIfPathIsInAVolume(container *Container, absPath string) (bool, error) {
+	var toVolume bool
+	for _, mnt := range container.MountPoints {
+		if toVolume = mnt.hasResource(absPath); toVolume {
+			if mnt.RW {
+				break
+			}
+			return false, ErrVolumeReadonly
+		}
+	}
+	return toVolume, nil
+}