Add and format a non-boot disk

add-disk.sh

#!/usr/bin/env bash

MOUNT_DIR=/mnt/data
DEVICE_NAME=/dev/$(lsblk | grep disk | tail -n1 | awk '{print $1}')

VERSION="0.1.0"
USAGE="\
Usage: add-disk.sh [--help | --version]
                   [--mount DIR] [--dev DEVICE]

Options:
  -h, --help          show this message and exit
  --version           show version and exit

  --mount DIR         set mount dir [default: $MOUNT_DIR]
  --dev DEVICE        set device name [default: $DEVICE_NAME]

Example:

sudo ./add-disk.sh --mount /mnt/disks/data1 --dev /dev/sda
"

main() {
  while [[ "$#" > 0 ]]; do
    case ${1:-""} in
      -h|--help) echo "$USAGE"; exit; break;;
      --version) echo "$VERSION"; exit 0; break;;
      --mount) MOUNT_DIR=${2:-""}; shift 2;;
      --dev) DEVICE_NAME=${2:-""}; shift 2;;
      *) printf "Unknown argument: $1\n$USAGE"; exit 1; break;;
    esac
  done

  mkfs.ext4 -m 0 -E lazy_itable_init=0,lazy_journal_init=0,discard $DEVICE_NAME
  mkdir -p $MOUNT_DIR
  mount -o discard,defaults $DEVICE_NAME $MOUNT_DIR
  chmod a+w $MOUNT_DIR

  local DEVICE_UUID=$(blkid $DEVICE_NAME | awk -F'"' '{print $2}')
  local dest=/etc/fstab
  local line="UUID=$DEVICE_UUID $MOUNT_DIR ext4 discard,defaults,nofail 0 2"

  grep -qsPe "^$line$" "$dest"
  if [[ $? ]]; then
    echo "already added to $dest"
  else
    tee --append $dest <<< "$line"
  fi
  cat $dest
}

main $@