#!/bin/bash

if [ $# -le 1 ]; then
  ROOT="$HOME"
else
  ROOT="$2"
fi

. /usr/local/etc/sync.conf
if [ $? -gt 0 ]; then
  echo "No configuration could be found. Please write the configuration in /usr/local/etc/sync.conf !"
  exit 1
fi

function try_lock() {
  local file="$ROOT/.rsync-lock"
  exec 200> $file
  if [ $? -ne 0 ]; then
    echo "Cannot create/open lock file: $file"
    exit 1
  fi
  flock -n 200
}

case $1 in
sync)
  if ! try_lock; then
    echo "Synchronisation is already in progress. Aborting right now !" >&2
    exit 1
  fi
  echo "Starting synchronisation..."
  rsync -e "ssh -i $HOME/.ssh/id_rsa_backup" --filter "merge $ROOT/.rsync-user-filter" $RSYNC_OPTS $ROOT/ $USER@$REMOTE_HOSTNAME:$ROOT
  ret=$?
  if [ $ret -gt 0 ]; then
    exit $ret
  else
    touch "$ROOT/.rsync-timestamp"
  fi
;;
status)
  if try_lock; then
    echo "Syncronization service for path $ROOT: STOPPED"
  else
    echo "Syncronization service for path $ROOT: RUNNING"
  fi
;;
pending)
  rsync -e "ssh -i $HOME/.ssh/id_rsa_backup" --filter "merge $ROOT/.rsync-user-filter" $RSYNC_OPTS --dry-run --stats $ROOT/ $USER@$REMOTE_HOSTNAME:$ROOT |sed -r 's/^Total transferred file size: ([0-9,]+) bytes.*/\1/; t clean; d; :clean; s/,//g'
;;
last)
  stat -c %Y $ROOT/.rsync-timestamp
;;
*)
  echo "$0 {sync|status|pending|last}"
  exit 1
;;
esac

exit 0