Allow disk resizing

[ ! -f "$BOOT" ] && echo "ERROR: Virtual DSM boot-image does not exist ($BOOT)" && exit 81

[ ! -f "$SYSTEM" ] && echo "ERROR: Virtual DSM system-image does not exist ($SYSTEM)" && exit 82

DATA="${IMG}/data.img"

DISK_SIZE=$(echo "${DISK_SIZE}" | sed 's/MB/M/g;s/GB/G/g;s/TB/T/g')

[ -f "$IMG/data$DISK_SIZE.img" ] && mv -f "$IMG/data$DISK_SIZE.img" "${DATA}"

NEW_SIZE=$(numfmt --from=iec "${DISK_SIZE}")

DATA="$IMG/data$DISK_SIZE.img"

if (( NEW_SIZE < 6442450944 )); then

  echo "ERROR: Please increase DISK_SIZE to at least 6 GB." && exit 83

fi

if [ -f "${DATA}" ]; then

  OLD_SIZE=$(stat -c%s "${DATA}")

  # Resize disk to new size if needed

  if [ "$NEW_SIZE" -ne "$OLD_SIZE" ]; then

    if [ "$NEW_SIZE" -gt "$OLD_SIZE" ]; then

      echo "Resizing data disk from $OLD_SIZE to $NEW_SIZE bytes.."

      fallocate -l "${NEW_SIZE}" "${DATA}"

    fi

    if [ "$NEW_SIZE" -lt "$OLD_SIZE" ]; then

if [ ! -f "$DATA" ]; then

      echo "INFO: Shrinking existing disks is not supported yet!"

      echo "INFO: Creating backup of old drive in storage folder..."

      mv -f "${DATA}" "${DATA}.bak"

    fi

  fi

fi

if [ ! -f "${DATA}" ]; then

  # Check free diskspace

    SPACE=$(df --output=avail -B 1 "$IMG" | tail -n 1)

  SPACE=$(df --output=avail -B 1 "${IMG}" | tail -n 1)

  if (( NEW_SIZE > SPACE )); then

      echo "ERROR: Not enough free space to create virtual disk." && exit 87

    echo "ERROR: Not enough free space to create virtual disk." && exit 84

  fi

  # Create an empty file

  if ! fallocate -l "${NEW_SIZE}" "${DATA}"; then

    rm -f "${DATA}"

      echo "ERROR: Could not allocate file for virtual disk." && exit 88

    echo "ERROR: Could not allocate file for virtual disk." && exit 85

  fi

  # Check if file exists

    if [ ! -f "$DATA" ]; then

      echo "ERROR: Virtual DSM data-image does not exist ($DATA)" && exit 83

  if [ ! -f "${DATA}" ]; then

    echo "ERROR: Virtual DSM data disk does not exist ($DATA)" && exit 86

  fi

  # Format as BTRFS filesystem

  mkfs.btrfs -q -L data -d single -m dup "${DATA}" > /dev/null

fi

# Resizing requires mounting a loop device which in turn requires

# the container to be privileged, so we must disable it for now.

#

# OLD_SIZE=$(stat -c%s "${DATA}")

#

# if [ "$NEW_SIZE" -ne "$OLD_SIZE" ]; then

#   echo "Resizing data disk from $OLD_SIZE to $NEW_SIZE bytes"

#

#   if [ "$NEW_SIZE" -gt "$OLD_SIZE" ]; then

#     fallocate -l "${NEW_SIZE}" "${DATA}"

#     btrfs filesystem resize "${NEW_SIZE}" "${DATA}"

#   fi

#

#   if [ "$NEW_SIZE" -lt "$OLD_SIZE" ]; then

#     btrfs filesystem resize "${NEW_SIZE}" "${DATA}"

#     fallocate -l "${NEW_SIZE}" "${DATA}"

#   fi

# fi

fi

KVM_DISK_OPTS="\

    -device virtio-scsi-pci,id=hw-synoboot,bus=pcie.0,addr=0xa \