docker-cleanup

#!/bin/bash

#    Docker cleanup - Cleanup Docker containers and images
#    Copyright (C) 2013-2024  Richard Huang <rickypc@users.noreply.github.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as
#    published by the Free Software Foundation, either version 3 of the
#    License, or (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Source function library.
. functions

# Only when docker executable exists.
if ! [ -x "$(command -v docker)" ]; then
  output_start
  echo 'Warning: docker is not installed.' >&2
  output_end
  exit 0
fi

# Only when docker daemon is running.
if ! docker stats --no-stream &> /dev/null; then
  output_start
  echo 'Warning: docker daemon is not running.' >&2
  output_end
  exit 0
fi

# Remove all exited containers.
CONTAINER_IDS=$(docker ps -qf status=exited)
if [ -n "$CONTAINER_IDS" ]; then
  step "Remove Docker exited containers"
    try docker rm -f $CONTAINER_IDS || continue
  next
fi

# Remove dangling images.
IMAGE_IDS=$(docker images -qf dangling=true)
if [ -n "$IMAGE_IDS" ]; then
  step "Remove Docker dangling images"
    try docker rmi -f $IMAGE_IDS || continue
  next
fi

# Remove all untagged images.
IMAGE_IDS=$(docker images -a --format '{{.ID}}' | grep "^<none>")
if [ -n "$IMAGE_IDS" ]; then
  step "Remove Docker untagged images"
    try docker rmi -f $IMAGE_IDS || continue
  next
fi

# Remove unused data.
step "Remove Docker unused data"
  try docker system prune -f
next