Migrates the fstab entries from a Warden jail to an iocage jail

migrate_fstab.sh

#!/bin/bash
# Enable display of executed commands
# set -x

JAIL_NAME=$1
BASE_DATASET="${2:-vault}"

echo "Preparing to migrate fstab entries from warden to iocage for the" \
  "${JAIL_NAME} jail under the ${BASE_DATASET} dataset:"

echo "Do you have the power?"
sudo echo "I have the power!"
if [[ $? == 1 ]] ; then
  echo "Apparently, you don't have the power."
  exit 1;
fi

FSTAB_ENTRIES="/tmp/${JAIL_NAME}.fstab"

# Remove the temporary file if it currently exists
if [[ -e "${JAIL_NAME}" ]]; then
  rm -f "${FSTAB_ENTRIES}"
fi

# Grab the Warden fstab file and make a fixed version of it
sed -e "s/\\/mnt\\/${BASE_DATASET}\\/jails\\/${JAIL_NAME}\\///g" < \
  "/mnt/${BASE_DATASET}/jails/.${JAIL_NAME}.meta/fstab" | \
  sort > "${FSTAB_ENTRIES}"

# Read in the lines, preventing backslash escapes (such as "\040") from being interpreted
while IFS='' read -r entry || [[ -n "$entry" ]]; do
  echo "Adding the following entry: ${entry}"
  # Change the "\040" in the fstab entry back to a space
  sub_path=$(echo "${entry}" | cut -d" " -f2 | sed -e "s/\\\\040/ /g")
  new_path="/mnt/iocage/jails/${JAIL_NAME}/root${sub_path}"
  # Create the target directory
  sudo mkdir -pv "${new_path}"
  # Add the mount point
  sudo iocage fstab --add "${JAIL_NAME}" "${entry}"
done < "${FSTAB_ENTRIES}"

# Delete the temporary mount entries
rm -f "${FSTAB_ENTRIES}"

echo "Done migrating fstab entries to the iocage jail."