unmount /var/cache/apt and /var/lib/apt if they were mounted when rem…

…ounting as readonly

remount

@@ -3,22 +3,26 @@ BEGIN {
 	FS = "[ ,]"
 	ARGC=2;
 	ARGV[1]="/proc/mounts";
+	system("sudo -K");
 }
 {
 	if ( $2 == "/" && $3 != "rootfs" ) {
-		if ( $4 == "ro" ) {
+		rootfs = $4;
+		if ( rootfs == "ro" ) {
 			print "remounting rootfs as readwrite";
-			system("sudo -K");
 			system("set -x; sudo mount -t tmpfs tmpfs /var/lib/apt");
 			system("set -x; sudo mount -t tmpfs tmpfs /var/cache/apt");
 			system("set -x; sudo mount -o remount,rw /");
-			system("sudo -K");
 		}
-		if ( $4 == "rw" ) {
+		if ( rootfs == "rw" ) {
 			print "remounting rootfs as readonly";
-			system("sudo -K");
 			system("set -x; sudo mount -o remount,ro /");
-			system("sudo -K");
 		}
 	}
+	if ( /apt/  && rootfs == "rw" ) {
+			system("set -x; sudo umount "$2);
+	}
+}
+END {
+	system("sudo -K");
 }