Allow debugging of the docker clean subcommand.

#!/bin/sh

set -eu

if [ -z "${DEBUG:-}" ]

then

    _xargs () { xargs "$@" 2>/dev/null; }

else

    _xargs () { xargs -t "$@"; }

fi

echo 'Checking for the Docker CLI.' >&2

docker version --format '{{ .Server.Version }}' > /dev/null

docker version --format '{{ .Client.Version }}' > /dev/null

echo 'Removing exited containers.' >&2

docker ps --quiet --filter=status=exited | xargs -r docker rm --volumes 2>/dev/null

docker ps --quiet --filter=status=exited | _xargs -r docker rm --volumes

echo 'Removing created but not run containers.' >&2

docker ps --quiet --filter=status=created | xargs -r docker rm --volumes 2>/dev/null

docker ps --quiet --filter=status=created | _xargs -r docker rm --volumes

echo 'Removing dangling (unused) images.' >&2

docker images --quiet --filter=dangling=true | xargs -r docker rmi 2>/dev/null

docker images --quiet --filter=dangling=true | _xargs -r docker rmi

echo 'Removing replaced (without a tag) images.' >&2

docker images --no-trunc | awk '$2=="<none>"'  | xargs -r docker rmi 2>/dev/null

docker images --no-trunc | awk '$2=="<none>" {print $3}'  | _xargs -r docker rmi

echo 'Removing dangling (unused) volumes.' >&2

docker volume ls --quiet --filter=dangling=true | xargs -r docker volume rm 2>/dev/null

docker volume ls --quiet --filter=dangling=true | _xargs -r docker volume rm

echo 'Running builtin Docker prune.' >&2

docker system prune --force || true