gistfile1.txt

#!/usr/bin/env bash

mountSnapshots () {
  mkdir -p "/mnt/$ZFSSNAPSHOTNAME"

  mount -t zfs "$ZFSSNAPSHOTBASE@$ZFSSNAPSHOTNAME" "/mnt/$ZFSSNAPSHOTNAME"

  while read -r line
  do
    MOUNTPATH=$(echo "$line" | sed "s/$ESCAPEDZFSSNAPSHOTBASE\///" | sed "s/@$ZFSSNAPSHOTNAME//")
    if [ -d "/mnt/$ZFSSNAPSHOTNAME/$MOUNTPATH" ]; then
      mount -t zfs "$line" "/mnt/$ZFSSNAPSHOTNAME/$MOUNTPATH"
    fi
  done < <(zfs list -t snapshot | grep "$ZFSSNAPSHOTNAME" | grep "$ZFSSNAPSHOTBASE" | grep -v "$ZFSSNAPSHOTBASE/\." | grep -o "$ZFSSNAPSHOTBASE/[0-9,a-z,A-Z,/,[:space:]]*@$ZFSSNAPSHOTNAME" | sed 's/[[:space:]]*$//')

}

unmountSnapshots () {
  while read -r line
  do
    MOUNTPATH=$(echo "$line" | sed "s/$ESCAPEDZFSSNAPSHOTBASE\///" | sed "s/@$ZFSSNAPSHOTNAME//")
    if [ -d "/mnt/$ZFSSNAPSHOTNAME/$MOUNTPATH" ]; then
      umount "/mnt/$ZFSSNAPSHOTNAME/$MOUNTPATH"
    fi
  done < <(zfs list -t snapshot | grep "$ZFSSNAPSHOTNAME" | grep "$ZFSSNAPSHOTBASE" | grep -v "$ZFSSNAPSHOTBASE/\." | grep -o "$ZFSSNAPSHOTBASE/[0-9,a-z,A-Z,/,[:space:]]*@$ZFSSNAPSHOTNAME" | sed 's/[[:space:]]*$//' | tail -r)

  umount "/mnt/$ZFSSNAPSHOTNAME"

  rmdir "/mnt/$ZFSSNAPSHOTNAME"
}


exitCleanup () {
  trap SIGINT

  unmountSnapshots

  zfs destroy -r "$ZFSSNAPSHOTBASE@$ZFSSNAPSHOTNAME"
  rm $PIDFILE

  exit

}

if [ $# -eq 2 ]
  then
    BASENAME=$(basename $1)
    RUNNAME=rclone-$BASENAME
    ZFSSNAPSHOTBASE=$(zfs list | grep "$BASENAME" | grep -v "$BASENAME/" | awk '{print $1}')
    ESCAPEDZFSSNAPSHOTBASE=$(echo "$ZFSSNAPSHOTBASE" | sed 's/\//\\\//')
    PIDFILE=/var/lock/$RUNNAME.pid
    ISOTIME=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
    YEAR=$(date -u +"%Y")
    ZFSSNAPSHOTNAME="rclone"
    if [ -f $PIDFILE ]
    then
      PID=$(cat $PIDFILE)
      ps -p $PID > /dev/null 2>&1
      if [ $? -eq 0 ]
      then
        echo "Process already running"
        exit 1
      else
        ## Process not found assume not running
        echo $$ > $PIDFILE
        if [ $? -ne 0 ]
        then
          echo "Could not create PID file"
          exit 1
        fi
      fi
    else
      echo $$ > $PIDFILE
      if [ $? -ne 0 ]
      then
        echo "Could not create PID file"
        exit 1
      fi
    fi

    zfs snapshot -r "$ZFSSNAPSHOTBASE@$ZFSSNAPSHOTNAME"

    trap "exitCleanup" INT
    
    mountSnapshots

    # Do tha backup dance!
    rclone --config /root/rclone.conf sync "/mnt/$ZFSSNAPSHOTNAME" "$2:$BASENAME/current" --backup-dir "$2:$BASENAME/$YEAR/$ISOTIME" --transfers 10 --log-file /var/log/$RUNNAME.log --log-level INFO

    unmountSnapshots

    zfs destroy -r "$ZFSSNAPSHOTBASE@$ZFSSNAPSHOTNAME"
    rm $PIDFILE
else
  echo "Argument should be: path remote"
fi