Add restore command and test.
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3 changed files with 90 additions and 22 deletions
65
dvbackup.sh
65
dvbackup.sh
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#!/usr/bin/env bash
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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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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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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/$target_name"
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set +x
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"$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/$target_name"
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}
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restore() {
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local volume
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local target
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local target_dir
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local target_name
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target="$(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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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/$target_name'"
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"$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/$target_name'"
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set +x
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}
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main() {
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local volumes
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volumes="$(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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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" "$volume_name.tar"
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done
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}
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restore_all() {
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for tarball in "$@"; 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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echo "Error: no such volume $volume_name" >&2
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exit 4
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fi
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restore "$tarball" "$volume_name"
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done
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}
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"$@"
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24
test/mock-docker.sh
Executable file
24
test/mock-docker.sh
Executable file
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@ -0,0 +1,24 @@
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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 "$@"
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fi
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23
test/test.sh
Executable file
23
test/test.sh
Executable file
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#!/usr/bin/env sh
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cd "$(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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