Added initial version of docker_clone_volume.sh

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

docker_clone_volume.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+#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\"..."
+echo docker run --rm \
+                -i \
+                -t \
+                -v $2:/from \
+                -v $1:/to \
+                alpine ash -c "cd /to ; cp -a /from/* ."