Added a functionality to pass arguments to install script

bare-arch-install.sh

@@ -4,8 +4,19 @@
 # BEGIN: Variables
 
 HOSTNAME="ExampleHostname"
-BOOT_METHOD="BIOS"
-DISK='/dev/sda'
+BOOT_METHOD="${1:?"Boot method was not provided. (BIOS, EFI)"}"
+BOOT_METHOD="${BOOT_METHOD^^}"
+
+[[ ! "$BOOT_METHOD" =~ ^(EFI|BIOS)$ ]] && {
+	echo "Your boot method $BOOT_METHOD, is not acceptible. Please provide a vaild one"
+	exit 
+}
+
+DISK="${2:?"Disk was not provided"}"
+[[ ! -d $DISK ]] && {
+	echo "Your disk ($DISK) does not exist. Please provide a valid one"
+	exit
+}
 EFI_PARTITION=${DISK}1
 SWAP_PARTITION=${DISK}2
 ROOT_PARTITION=${DISK}3