Add a filesystem to a drive (if it does not already have one), and mount it to a path.

formatted_mount.sh

#!/bin/bash
# This script will ensure a device has a filesystem before mounting it to a given path.  
# It will only attempt to create the filesystem if one does not already exist on the device.
#
# AUTHOR: A.J. Brown <aj@ajbrown.org>

DEV='/dev/xvdf'
MOUNT_TO='/data'
FS='ext4'

currentFs=`blkid -s TYPE -o value $DEV`
if [ -z $currentFs ]; then
  echo "No existing filesystem, so $FS will be added."
  mkfs.$FS $DEV
  if [ $? -ne 0 ]; then
    echo "Error creating $FS filesystem on $DEV.  Aborting."
    exit 1
  fi
elif [ "$currentFs" -ne "$FS" ]; then
  echo "Warning:  existing filesystem '$currentfs' doesn't match the desired filesystem '$FS'.  Continuing anyway."
fi

mkdir -p $MOUNT_TO
mount $DEV $MOUNT_TO

if [ $? -ne 0 ]; then
  echo "ERROR: Could not mount $DEV to $MOUNT_TO.  Aborting"
  exit 1
fi

echo "Succesfully mounted $DEV to $MOUNT_TO"