Initial version

Dockerfile

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+FROM alpine:3.8
+
+RUN set -ex \
+ && apk --no-cache add \
+      bash \
+      docker \
+      gawk
+
+COPY docker-clean /usr/local/bin/
+
+ENTRYPOINT ["docker-clean"]

docker-clean

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+#!/bin/bash
+set -euo pipefail
+
+if [ -e "${HOME}/bin/script_framework.sh" ]; then
+  source "${HOME}/bin/script_framework.sh"
+else
+  function step() { echo $@; }
+fi
+
+step "Removing containers created / exited >= ~1h ago..."
+CONTAINERS=$(docker ps -a | gawk '/(hours?|days?|weeks?|months?) ago\s+(Created|Exited)/{ print $1 }' | xargs)
+[ -n "${CONTAINERS}" ] && docker rm ${CONTAINERS}
+
+step "Untagging all images not used by containers..."
+PS_OUTPUT=$(docker ps -a)
+for img in $(docker images | gawk '/^[a-z].*(hours?|days?|weeks?|months?) ago/{ print $1":"$2 }' | grep -v '<none>' | sort | uniq); do
+  if ! (echo "${PS_OUTPUT}" | grep -q "\s${img}\s") && ! (echo "${PS_OUTPUT}" | grep -q "\s${img%:latest}\s"); then
+    docker rmi --no-prune "${img}"
+  fi
+done
+
+step "Removing dangling images..."
+docker image prune -f