Add basic backup capabilities (uncommited changes from long ago)

backup.sh

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+#!/bin/bash
+_now=$(date +"%Y-%m-%d")
+
+compose_project="next"
+compose_volumes=( "nc-data" "db-data" )
+
+for volume in "${compose_volumes[@]}"
+do
+  volume_name="${compose_project}_${volume}"
+  ./vackup export "${volume_name}" "backup_${_now}.${volume_name}.tar.gz"
+done

restore.sh

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+#!/bin/bash
+_date="$1"
+
+if [ -z "$_date" ]
+then
+  echo "Error: no date given."
+  exit 1
+fi
+
+compose_project="next"
+compose_volumes=( "db-data" )
+
+for volume in "${compose_volumes[@]}"
+do
+  volume_name="${compose_project}_${volume}"
+ ./vackup import "backup_${_date}.${volume_name}.tar.gz" "${volume_name}"
+done

vackup

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+#!/bin/bash
+## FROM: https://github.com/BretFisher/docker-vackup
+## UNLICENSED BY: BretFisher
+# Docker Volume File Backup and Restore Tool
+# Easily tar up a volume on a local (or remote) engine
+# Inspired by CLIP from Lukasz Lach
+
+set -Eeo pipefail
+
+handle_error() {
+  exit_code=$?
+  if [ -n "${VACKUP_FAILURE_SCRIPT}" ]; then
+    /bin/bash "${VACKUP_FAILURE_SCRIPT}" "$1" $exit_code
+  fi
+  exit $exit_code
+}
+
+trap 'handle_error $LINENO' ERR
+
+usage() {
+cat <<EOF
+
+"Docker Volume Backup". Replicates image management commands for volumes.
+
+export/import copies files between a host tarball and a volume. For making
+  volume backups and restores.
+
+save/load copies files between an image and a volume. For when you want to use 
+  image registries as a way to push/pull volume data.
+
+Usage: 
+
+vackup export VOLUME FILE
+  Creates a gzip'ed tarball in current directory from a volume
+
+vackup import FILE VOLUME
+  Extracts a gzip'ed tarball into a volume
+
+vackup save VOLUME IMAGE
+  Copies the volume contents to a busybox image in the /volume-data directory
+
+vackup load IMAGE VOLUME
+  Copies /volume-data contents from an image to a volume
+
+EOF
+}
+
+if [ -z "$1" ] || [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
+    usage
+    exit 0
+fi
+
+cmd_export() {
+    VOLUME_NAME="$2"
+    FILE_NAME="$3"
+    
+    if [ -z "$VOLUME_NAME" ] || [ -z "$FILE_NAME" ]; then
+        echo "Error: Not enough arguments"
+        usage
+        exit 1
+    fi
+    
+    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME";
+    then
+        echo "Error: Volume $VOLUME_NAME does not exist"
+        exit 1
+    fi
+
+# TODO: check if file exists on host, if it does
+# create a option for overwrite and check if that's set
+# TODO: if FILE_NAME starts with / we need to error out
+# unless we can translate full file paths
+
+    if ! docker run --rm \
+      -v "$VOLUME_NAME":/vackup-volume \
+      -v "$(pwd)":/vackup \
+      busybox \
+      tar -zcvf /vackup/"$FILE_NAME" /vackup-volume;
+    then
+        echo "Error: Failed to start busybox backup container"
+        exit 1
+    fi
+
+    echo "Successfully tar'ed volume $VOLUME_NAME into file $FILE_NAME"
+}
+
+cmd_import() {
+    FILE_NAME="$2"
+    VOLUME_NAME="$3"
+    
+    if [ -z "$VOLUME_NAME" ] || [ -z "$FILE_NAME" ]; then
+        echo "Error: Not enough arguments"
+        usage
+        exit 1
+    fi
+    
+    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME";
+    then
+        echo "Error: Volume $VOLUME_NAME does not exist"
+        docker volume create "$VOLUME_NAME"
+    fi
+
+# TODO: check if file exists on host, if it does
+# create a option for overwrite and check if that's set
+# TODO: if FILE_NAME starts with / we need to error out
+# unless we can translate full file paths    
+
+    if ! docker run --rm \
+      -v "$VOLUME_NAME":/vackup-volume \
+      -v "$(pwd)":/vackup \
+      busybox \
+      tar -xvzf /vackup/"$FILE_NAME" -C /; 
+    then
+        echo "Error: Failed to start busybox container"
+        exit 1
+    fi
+
+    echo "Successfully unpacked $FILE_NAME into volume $VOLUME_NAME"
+}
+
+cmd_save() {
+    VOLUME_NAME="$2"
+    IMAGE_NAME="$3"
+
+    if [ -z "$VOLUME_NAME" ] || [ -z "$IMAGE_NAME" ]; then
+        echo "Error: Not enough arguments"
+        usage
+        exit 1
+    fi
+
+    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME"; 
+    then
+        echo "Error: Volume $VOLUME_NAME does not exist"
+        exit 1
+    fi
+
+    if ! docker run \
+      -v "$VOLUME_NAME":/mount-volume \
+      busybox \
+      cp -Rp /mount-volume/. /volume-data/;
+    then
+        echo "Error: Failed to start busybox container"
+        exit 1
+    fi
+
+    CONTAINER_ID=$(docker ps -lq)
+
+    docker commit -m "saving volume $VOLUME_NAME to /volume-data" "$CONTAINER_ID" "$IMAGE_NAME"
+
+    docker container rm "$CONTAINER_ID"
+  
+    echo "Successfully copied volume $VOLUME_NAME into image $IMAGE_NAME, under /volume-data"
+}
+
+cmd_load() {
+    IMAGE_NAME="$2"
+    VOLUME_NAME="$3"
+    
+    if [ -z "$VOLUME_NAME" ] || [ -z "$IMAGE_NAME" ]; then
+        echo "Error: Not enough arguments"
+        usage
+        exit 1
+    fi
+
+    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME"; 
+    then
+      echo "Volume $VOLUME_NAME does not exist, creating..."
+      docker volume create "$VOLUME_NAME"
+    fi
+    
+    if ! docker run --rm \
+      -v "$VOLUME_NAME":/mount-volume \
+      "$IMAGE_NAME" \
+      cp -Rp /volume-data/. /mount-volume/; 
+    then
+        echo "Error: Failed to start container from $IMAGE_NAME"
+        exit 1
+    fi
+
+    echo "Successfully copied /volume-data from $IMAGE_NAME into volume $VOLUME_NAME"
+}
+
+COMMAND="$1"
+case "$COMMAND" in
+  export) cmd_export "$@" ;;
+  import) cmd_import "$@" ;;
+  save) cmd_save "$@" ;;
+  load) cmd_load "$@" ;;
+esac
+
+exit 0