add docker-volume-snapshot

docker-volume-snapshot

@@ -0,0 +1,42 @@
+#!/bin/bash
+set -e -o pipefail
+
+programname=`basename "$0"`
+
+display_usage() {
+    echo "usage: $programname (create|restore) source destination"
+    echo "  create         create snapshot file from docker volume"
+    echo "  restore        restore snapshot file to docker volume"
+    echo "  source         source path"
+    echo "  destination    destination path"
+    echo
+    echo "Tip: Supports tar's compression algorithms automatically"
+    echo "     based on the file extention, for example .tar.gz"
+    echo
+    echo "Examples:"
+    echo "docker-volume-snapshot create xyz_volume xyz_volume.tar"
+    echo "docker-volume-snapshot create xyz_volume xyz_volume.tar.gz"
+    echo "docker-volume-snapshot restore xyz_volume.tar xyz_volume"
+    echo "docker-volume-snapshot restore xyz_volume.tar.gz xyz_volume"
+}
+
+case "$1" in
+    "create")
+        if [[ -z "$2" || -z "$3" ]]; then display_usage; exit 1; fi
+        directory=`dirname "$3"`
+        if [ "$directory" == "." ]; then directory=$(pwd); fi
+        filename=`basename "$3"`
+        docker run --rm -v "$2:/source" -v "$directory:/dest" busybox tar cvaf "/dest/$filename" -C /source .
+        ;;
+    "restore")
+        if [[ -z "$2" || -z "$3" ]]; then display_usage; exit 1; fi
+        directory=`dirname "$2"`
+        if [ "$directory" == "." ]; then directory=$(pwd); fi
+        filename=`basename "$2"`
+        docker run --rm -v "$3:/dest" -v "$directory:/source" busybox tar xvf "/source/$filename" -C /dest
+        ;;
+    *)
+        display_usage
+        exit 1 # Command to come out of the program with status 1
+        ;;
+esac