unisonHomeDirectory

#! /bin/bash
#
readonly unisonProfile='roamingRemoteHome'
readonly unisonPrefer='newer'
readonly unisonLog='unisonCronJob.log'
readonly lockFilePath="${HOME}/.unison/unisonCronjob.lock"
readonly testHost='10.6.0.71'
readonly testPort='5001'
batteryLevel="$(cat /sys/class/power_supply/BAT*/capacity)"
acStatus="$(cat /sys/class/power_supply/BAT*/status)"

# Check for lockfile, create if it doesn't exist
echo "Unison CronJob..."
echo "Checking if lock file at ${lockFilePath} exists."
if [ -f "${lockFilePath}" ]; then
  echo "Unison Cronjob can't start, lock file exists."
  exit 1
else
  echo "Lock file does not exist, making one now."
  echo $$ > "${lockFilePath}"
  # Register a trap to clean up the lockfile
  trap 'rm -fv ${lockFilePath}' 0 2 3 15
fi

# Run tests
echo "Testing if host ${testHost} is reachable"
if ! ping -c 3 "${testHost}"; then
  echo "Can't ping unison host at ${testHost}, exiting."
  exit 1
fi

echo "Testing if port ${testPort} is reachable on host ${testHost}"
if ! nc -z "${testHost}" "${testPort}"; then
  echo "Can't reach unison port at ${testPort}, exiting."
  exit 1
fi

echo "Testing if laptop is on AC or if battery is low"
if [[ "${acStatus}" == 'Discharging' && "${batteryLevel}" -lt 30 ]]; then
	echo "Battery discharging and lower than ${batteryLevel}, exiting."
	exit 1
fi

echo "Running unison with profile ${unisonProfile}.prf..."
unison -auto -batch "$@" \
  -logfile "./${unisonLog}" \
  -prefer "${unisonPrefer}" \
  "${unisonProfile}.prf"