docker_clone_volume.bash

#!/bin/bash

# Taken from https://github.com/gdiepen/docker-convenience-scripts (⭐)
# wget https://raw.githubusercontent.com/gdiepen/docker-convenience-scripts/master/docker_clone_volume.sh

#Author: Guido Diepen

#Convenience script that can help me to easily create a clone of a given
#data volume. The script is mainly useful if you are using named volumes

#First check if the user provided all needed arguments
if [ "$1" = "" ]; then
  echo "Please provide a source volume name"
  exit
fi

if [ "$2" = "" ]; then
  echo "Please provide a destination volume name"
  exit
fi

#Check if the source volume name does exist
docker volume inspect "$1" >/dev/null 2>&1
if [ "$?" != "0" ]; then
  echo "The source volume \"$1\" does not exist"
  exit
fi

#Now check if the destinatin volume name does not yet exist
docker volume inspect "$2" >/dev/null 2>&1

if [ "$?" = "0" ]; then
  echo "The destination volume \"$2\" already exists"
  exit
fi

echo "Creating destination volume \"$2\"..."
docker volume create --name "$2"
echo "Copying data from source volume \"$1\" to destination volume \"$2\"..."
docker run --rm \
  --interactive \
  --tty \
  --volume "$1":/from \
  --volume "$2":/to \
  alpine ash -c "cd /from ; cp -av . /to"