Add a wiping option to the installer

When running Ghaf on a target device and also trying to boot from an SSD
there is a conflick in the boot, as to which target image will be run.
for that reason the insstaller now has an option to wipe the installed
ghaf image from the DUT.

Normal installation (wipe and install)remains:
`sudo ghaf-installer`

To only wipe the system run:
`sudo ghaf-installer -w`

Signed-off-by: Brian McGillion <[email protected]>

packages/installer/ghaf-installer.sh

@@ -3,16 +3,36 @@
 # SPDX-License-Identifier: Apache-2.0
 
 if [ "$EUID" -ne 0 ]; then
-	echo "Please run as root"
+  echo "Please run as root"
   exit
 fi
 
 # Make sure $IMG_PATH env is set
 if [ -z "$IMG_PATH" ]; then
-	echo "IMG_PATH is not set!"
-	exit
+  echo "IMG_PATH is not set!"
+  exit
 fi
 
+usage() {
+  echo " "
+  echo "Usage: $(basename "$0") [-w]"
+  echo "  -w  Wipe only"
+  exit 1
+}
+
+WIPE_ONLY=false
+
+while getopts "w" opt; do
+  case $opt in
+  w)
+    WIPE_ONLY=true
+    ;;
+  ?)
+    usage
+    ;;
+  esac
+done
+
 clear
 
 cat <<"EOF"
@@ -33,45 +53,46 @@ EOF
 
 echo "Welcome to Ghaf installer!"
 
-echo "To install image choose path to the device on which image will be installed."
+echo "To install image or wipe installed image choose path to the device."
 
 hwinfo --disk --short
 
 while true; do
-	read -r -p "Device name [e.g. /dev/nvme0n1]: " DEVICE_NAME
-
-	if [ ! -d "/sys/block/$(basename "$DEVICE_NAME")" ]; then
-		echo "Device not found!"
-		continue
-	fi
-
-	# Check if removable
-	if [ "$(cat "/sys/block/$(basename "$DEVICE_NAME")/removable")" != "0" ]; then
-		read -r -p "Device provided is removable, do you want to continue? [y/N] " response
-		case "$response" in
-			[yY][eE][sS]|[yY])
-				break
-				;;
-			*)
-				continue
-				;;
-		esac
-	fi
-
-	break
+  read -r -p "Device name [e.g. /dev/nvme0n1]: " DEVICE_NAME
+
+  if [ ! -d "/sys/block/$(basename "$DEVICE_NAME")" ]; then
+    echo "Device not found!"
+    continue
+  fi
+
+  # Check if removable
+  if [ "$(cat "/sys/block/$(basename "$DEVICE_NAME")/removable")" != "0" ]; then
+    read -r -p "Device provided is removable, do you want to continue? [y/N] " response
+    case "$response" in
+    [yY][eE][sS] | [yY])
+      break
+      ;;
+    *)
+      continue
+      ;;
+    esac
+  fi
+
+  break
 done
 
-echo "Installing Ghaf on $DEVICE_NAME"
+echo "Installing/Deleting Ghaf on $DEVICE_NAME"
 read -r -p 'Do you want to continue? [y/N] ' response
 
 case "$response" in
-	[yY][eE][sS]|[yY]);;
-	*)
-		echo "Exiting..."
-		exit
-		;;
+[yY][eE][sS] | [yY]) ;;
+*)
+  echo "Exiting..."
+  exit
+  ;;
 esac
 
+echo "Wiping device..."
 # Wipe any possible ZFS leftovers from previous installations
 # Set sector size to 512 bytes
 SECTOR=512
@@ -83,6 +104,13 @@ SECTORS=$(blockdev --getsz "$DEVICE_NAME")
 dd if=/dev/zero of="$DEVICE_NAME" bs="$SECTOR" count="$MIB_TO_SECTORS" conv=fsync status=none
 # Wipe last 10MiB of disk
 dd if=/dev/zero of="$DEVICE_NAME" bs="$SECTOR" count="$MIB_TO_SECTORS" seek="$((SECTORS - MIB_TO_SECTORS))" conv=fsync status=none
+echo "Wipe done."
+
+if [ "$WIPE_ONLY" = true ]; then
+  echo "Wipe only option selected. Exiting..."
+  echo "Please remove the installation media and reboot"
+  exit
+fi
 
 echo "Installing..."
 zstdcat "$IMG_PATH" | dd of="$DEVICE_NAME" bs=32M status=progress