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4 changed files with 24 additions and 141 deletions
39
README.md
39
README.md
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# Docker Volume Backup
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A simple script which creates tarballs from docker volumes and restores
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them.
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## Usage
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### Backup a single volume
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`./dvbackup.sh backup <volume_name> <path/to/tarball.tar>`
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Creates a tarball from the contents of the volume.
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### Restore a single volume
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`./dvbackup.sh restore <path/to/tarball.tar> <volume_name>`
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Restores the tarball into the volume. *This is destructive*, all old
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contents will be removed from the volume. The volume must already exist.
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### Backup all named volumes
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`./dvbackup.sh backup_all`
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Creates backups from all volumes which do not only contain the character
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set `[0-9a-f]`.
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This command will output a `<volume_name>.tar` file for every found
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volume in the current working directory.
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### Restore volumes
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`./dvbackup.sh restore_all [volume.tar...]`
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Restores all given tarballs into their respective volumes. The volumes
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must already exist and the operation is *destructive* in the same way
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as the `restore` operation. The default behaviour is to ask before
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continuing, this can be overridden by setting `DVB_I_KNOW_WHAT_I_DO=y`.
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Volumes can be created implicitly by setting `DVB_CREATE_VOLUME=y`.
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79
dvbackup.sh
79
dvbackup.sh
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#!/usr/bin/env sh
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if [ -z "$DOCKER" ]; then
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DOCKER=docker
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fi
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echo_and_run() {
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echo "$@"
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"$@"
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return $?
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}
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#!/usr/bin/env bash
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backup() {
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local volume
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local target
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local target_dir
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local target_name
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volume="$1"
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target="$(realpath "$2")"
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target_dir="$(dirname "$target")"
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target_name="$(basename "$target")"
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test -z "$("$DOCKER" volume ls | grep "$volume")" && { echo "Error: No such volume, aborting" >&2; exit 1; }
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test -z "$(docker volume ls | grep "$volume")" && { echo "Error: No such volume, aborting" >&2; exit 1; }
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test -z "$target_dir" && { echo "Error: No base folder found for target=$target" >&2; exit 2; }
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test -z "$target_name" && { echo "Error: No target name found for target=$target" >&2; exit 3; }
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echo_and_run "$DOCKER" run --rm \
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--mount="type=volume,source=$volume,destination=/data,ro=true" \
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--mount="type=bind,source=$target_dir,destination=/data2" \
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busybox /bin/sh -c \
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"cd /data/ && tar cf '/data2/$target_name' ./* && chown $(id -u):$(id -g) /data2/$target_name"
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set -x
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docker run --rm --mount="type=volume,source=$volume,destination=/data,ro=true" --mount="type=bind,source=$target_dir,destination=/data2" busybox /bin/sh -c "tar cvf '/data2/$target_name' /data && chown $(id -u):$(id -g) /data2/$target_name"
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set +x
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}
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restore() {
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local volume
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local target
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local target_dir
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local target_name
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target="$(realpath "$1")"
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target_dir="$(dirname "$target")"
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target_name="$(basename "$target")"
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volume="$2"
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test -z "$("$DOCKER" volume ls | grep "$volume")" && { echo "Error: No such volume, aborting" >&2; exit 1; }
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test -z "$(docker volume ls | grep "$volume")" && { echo "Error: No such volume, aborting" >&2; exit 1; }
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test -z "$target_dir" && { echo "Error: No base folder found for target=$target" >&2; exit 2; }
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test -z "$target_name" && { echo "Error: No target name found for target=$target" >&2; exit 3; }
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echo_and_run "$DOCKER" run --rm \
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--mount="type=volume,source=$volume,destination=/data" \
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--mount="type=bind,source=$target_dir,destination=/data2" \
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busybox /bin/sh -c \
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"cd /data/ && rm -rf ./* && tar xf '/data2/$target_name'"
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set -x
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docker run --rm --mount="type=volume,source=$volume,destination=/data" --mount="type=bind,source=$target_dir,destination=/data2" busybox /bin/sh -c "rm -rf /data/* && cd / && tar xvf '/data2/$target_name'"
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set +x
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}
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backup_all() {
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"$DOCKER" volume ls \
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| awk '!/^[a-z]+ +[0-9a-f]+$/ && (NR>1) {print $2}' \
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| while read -r volume_name; do
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echo "$volume_name -> $volume_name.tar"
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backup "$volume_name" "$volume_name.tar"
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done
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}
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restore_all() {
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if [ -z "$DVB_I_KNOW_WHAT_I_DO" ]; then
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printf "The following operation will delete all data in the volumes to be restored, are you sure [y/N]? "
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read -r DVB_I_KNOW_WHAT_I_DO
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fi
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if echo "$DVB_I_KNOW_WHAT_I_DO" | grep -Eviq 't|true|1|y|yes'; then
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echo aborting
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exit 1
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fi
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for tarball in "$@"; do
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volume_name="${tarball%.tar}"
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echo "$volume_name -> $volume"
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if ! "$DOCKER" volume inspect "$volume_name" 1>&2 2>/dev/null; then
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if echo "$DVB_CREATE_VOLUME" | grep -Eiq 't|true|1|y|yes'; then
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"$DOCKER" volume create "$volume_name"
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else
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echo "Error: no such volume $volume_name" >&2
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exit 4
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fi
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fi
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restore "$tarball" "$volume_name"
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done
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main() {
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local volumes
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volumes="$(docker volume ls | tail -n+2 | egrep -v '[a-z]+\s+[0-9a-f]+$' | egrep -o '\s.+$' | sed 's/\s//g')"
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while read -r line; do
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echo "$line -> $line.tar"
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backup "$line" "$line.tar"
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done <<< "$volumes"
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}
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"$@"
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#!/usr/bin/env sh
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volume() {
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if [ "$1" = 'ls' ]; then
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echo "DRIVER VOLUME NAME"
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echo "local 00c674e3f3c1587d88c2ebf2f91da5843b9dddb3e8df272898bdfd4e596aef79"
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echo "local $DOCKER_MOCK_VOLUME"
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return 0
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elif [ "$2" = 'inspect' ]; then
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if [ "$3" = "$DOCKER_MOCK_VOLUME" ]; then
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return 0
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else
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return 1
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fi
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fi
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}
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if [ "$1" = "volume" ]; then
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"$@"
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else
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docker "$@"
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fi
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23
test/test.sh
23
test/test.sh
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#!/usr/bin/env sh
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cd "$(dirname "$0")" || exit 1
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VOLUME_NAME="$(dd if=/dev/random bs=6 count=1 | base64)"
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docker volume create "$VOLUME_NAME"
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# shellcheck disable=SC2064
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trap "docker volume rm $VOLUME_NAME && rm -f $VOLUME_NAME.tar" EXIT
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docker run --rm --volume="$VOLUME_NAME:/data" alpine \
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sh -c 'echo "test" > /data/a.txt'
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DOCKER=./mock-docker.sh DOCKER_MOCK_VOLUME="$VOLUME_NAME" \
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../dvbackup.sh backup_all
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stat "$VOLUME_NAME.tar" || exit 1
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docker run --rm --volume="$VOLUME_NAME:/data" alpine \
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sh -c 'rm /data/a.txt' || exit 1
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DOCKER=./mock-docker.sh DOCKER_MOCK_VOLUME="$VOLUME_NAME" \
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../dvbackup.sh restore_all "$VOLUME_NAME.tar" || exit 1
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docker run --rm --volume="$VOLUME_NAME:/data" alpine \
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sh -c 'stat /data/a.txt' || exit 1
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exit 0
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