Add cleanup function to destroy and allow clean restart

lmde-expert.sh

@@ -267,6 +267,38 @@ function install_expert() {
 	expert_step
 }
 
+function install_cleanup() {
+	if [[ "$DEBUG" ]]; then
+		local cmd="echo"
+	else
+		local cmd=""
+	fi
+
+	for subvol in "${!SUBVOLS_DEFAULT[@]}"
+	do
+		${cmd} umount /target/"${SUBVOLS_DEFAULT[$subvol]}"
+	done
+
+	if [[ "$SWAP" ]]; then
+		${cmd} umount /target/swap
+	fi
+
+	${cmd} umount /target/boot/efi
+	${cmd} umount /target/boot
+	${cmd} umount /target
+
+	if [[ "$ENCRYPTION" ]]; then
+		${cmd} cryptsetup luksClose luksvol
+	fi
+
+	${cmd} dd if=/dev/zero of="${RootPart}" bs=1024 count=10
+	${cmd} dd if=/dev/zero of="${EFIPart}" bs=1024 count=10
+	if [[ "$BootPart" != "@boot" ]]; then
+		${cmd} dd if=/dev/zero of="${BootPart}" bs=1024 count=10
+	fi
+}
+
+
 declare -a POSITIONAL_ARGS=()
 declare INSTALL_MODE="normal"
 
@@ -291,6 +323,10 @@ while [[ $# -gt 0 ]]; do
 			INSTALL_MODE=expert
 			shift
 			;;
+		--clean)
+			INSTALL_MODE=clean
+			shift
+			;;
 		*)
 			POSITIONAL_ARGS+=("$1") # save positional arg
 			shift
@@ -317,6 +353,7 @@ else
 	case "$INSTALL_MODE" in
 		normal) install_normal;;
 		expert)	install_expert;;
+		clean)  install_cleanup;;
 		*)
 			echo "Error, unknown installation mode detected."
 			exit 3