docker-volume-cp script: copy one Docker volume content to a new one

docker-volume-cp

#!/usr/bin/env sh

if [ "$#" -ne 2 ]; then
  echo "docker-volume-cp: copy one Docker volume content to another"
  echo
  echo "Use: docker-volume-cp VOL_SOURCE VOL_DEST"
  echo
  echo "NOTE: if VOL_DEST does not exist, docker-volume-cp creates it first"
  exit 2
fi

docker volume create --name "$2"
docker run --rm -it -v "$1:/from" -v "$2:/$2" alpine sh -c "cd /from ; cp -av . /$2"