docker-migrate.sh

#!/bin/sh

if [ "$2" == "" ]; then
  >&2 echo "Usage: $0 backup|restore volume_name"
  exit 1
fi

if [ "$1" == "backup" ]; then
  docker run -it --rm -v $2:/volume -v `pwd`:/backup alpine tar -cjf /backup/$2.tar.bz2 -C /volume ./
elif [ "$1" == "restore" ]; then
  if [ -e "$2.tar.bz2" ]; then
    docker run -it --rm -v $2:/volume -v `pwd`:/backup alpine sh -c "rm -rf /volume/* /volume/..?* /volume/.[!.]* ; tar -C /volume/ -xjf /backup/$2.tar.bz2"
  else
    >&2 echo "$2.tar.bz2 does not exist in the current directory"
    exit 1
  fi
else
  >&2 echo "first argument must be either backup or restore"
  exit 1
fi