fix: improve mtm-ddwipe argument handling and timing output

mtm-ddwipe

@@ -1,14 +1,13 @@
 #!/bin/bash
 
-declare -r DEV="${1}"
-declare STARTDATE=""
-declare STARTDATESTRING=""
+VERSION="0.0.3"
+STARTDATE=""
+STARTDATESTRING=""
 
 show_help() {
 	echo "Usage: mtm-ddwipe DEVICE"
-	echo ""
 	echo "Wipe a block device."
-	echo "Version: 0.0.3"
+	echo "Version: ${VERSION}"
 }
 
 check_args() {
@@ -21,6 +20,11 @@ check_args() {
 			show_help
 			exit 1
 			;;
+		-*)
+			echo "Invalid option."
+			show_help
+			exit 1
+			;;
 	esac
 }
 
@@ -43,43 +47,16 @@ confirm_wipe() {
 	echo ""
 	read -r -p "Wipe ${1} (y/[n])? " CHOICE
 	case "${CHOICE}" in
-		y|Y ) echo "";;
-		* )
+		y|Y)
+			echo ""
+			;;
+		*)
 			echo "Canceled"
 			exit 1
-		;;
+			;;
 	esac
 }
 
-wipe_dev() {
-	STARTDATE=$(date +%s)
-	STARTDATESTRING="$(date)"
-	echo "Begin wiping device ${1}"
-	echo ""
-	echo "Start date :"
-	echo "${STARTDATESTRING}"
-	echo ""
-	echo "blkdiscard secure"
-	if ! blkdiscard -f -p 500M -s -v "${1}"; then
-		echo ""
-		echo "blkdiscard zero"
-		if ! blkdiscard -f -p 500M -z -v "${1}"; then
-			echo ""
-			echo "dd zero"
-			if ! dd if=/dev/zero of="${1}" bs=1M status=progress; then
-				# Need check if dd has all writed, if yes, return no error
-				# echo "Error wiping device ${1}, use phisical destroy !"
-				echo "Wiped with dd, check if full size is writed."
-				echo "Otherwise use a mechanical destruction of the device."
-				print_time
-				exit 1
-			fi
-		fi
-	fi
-	echo ""
-	echo "Device ${1} wiped."
-}
-
 print_time() {
 	echo ""
 	echo "Start date :"
@@ -96,9 +73,36 @@ print_time() {
 	date -d@${CALCTIME} -u +%H:%M:%S
 }
 
-check_args "${DEV}"
-check_dev_exist "${DEV}"
-check_dev_block "${DEV}"
-confirm_wipe "${DEV}"
-wipe_dev "${DEV}"
+wipe_dev() {
+	STARTDATE=$(date +%s)
+	STARTDATESTRING="$(date)"
+	echo "Begin wiping device ${1}"
+	echo ""
+	echo "Start date :"
+	echo "${STARTDATESTRING}"
+	echo ""
+	echo "blkdiscard secure"
+	if ! blkdiscard -f -p 500M -s -v "${1}"; then
+		echo ""
+		echo "blkdiscard zero"
+		if ! blkdiscard -f -p 500M -z -v "${1}"; then
+			echo ""
+			echo "dd zero"
+			if ! dd if=/dev/zero of="${1}" bs=1M status=progress; then
+				echo "Wiped with dd, check if full size is writed."
+				echo "Otherwise use a mechanical destruction of the device."
+				print_time
+				exit 1
+			fi
+		fi
+	fi
+	echo ""
+	echo "Device ${1} wiped."
+}
+
+check_args "${1}"
+check_dev_exist "${1}"
+check_dev_block "${1}"
+confirm_wipe "${1}"
+wipe_dev "${1}"
 print_time