#!/bin/bash

set -e -o pipefail

info() {
    [ "$#" -gt 0 ] && echo -e "\033[1m>>> $*\033[0m" >&2
}

readarray -t volumes < <(docker volume ls --format "{{ .Name }}")

for v in "${volumes[@]}"; do
    info "Dumping \"$v\""
    docker run --rm -v "$v":/vol:ro localhost/archiver sh -c \
        "bsdtar -C /vol --numeric-owner -c . | zstdmt -15v" \
        > "$v".tar.zst

    docker volume inspect "$v" > "$v".json
done