adding in script to cleanup disk space

cleanup-docker-disk-space.sh

@@ -0,0 +1,154 @@
+#!/usr/bin/env bash
+
+# Set shell options:
+#   -e, exit immediately if a command exits with a non-zero status
+#   -o pipefail, means that if any element of the pipeline fails, then the pipeline as a whole will fail.
+#   -u, treat unset variables as an error when substituting.
+set -e
+set -u
+set -o pipefail
+
+DONT_RESTART_DOCKER_ENGINE=0
+DONT_ASK_CONFIRMATION=0
+
+while [[ $# -gt 0 ]]; do
+  key="$1"
+
+  case $key in
+    --no-restart)
+      DONT_RESTART_DOCKER_ENGINE=1
+      shift
+      ;;
+    -y)
+      DONT_ASK_CONFIRMATION=1
+      shift
+      ;;
+    *)
+      echo "Unknown parameter passed: $1";
+      exit 1;
+      ;;
+  esac
+done
+
+
+# Asks user for confirmation interactively
+ask_user_for_confirmation () {
+
+cat << EOF
+
+==============================================
+This script reclaims disk space by removing stale and unused Docker data:
+  > removes stopped containers
+  > removes orphan (dangling) images layers
+  > removes unused volumes
+  > removes Docker build cache
+  > shrinks the "Docker.raw" file on MacOS
+  > restarts the Docker engine
+  > prints Docker disk usage
+==============================================
+
+EOF
+
+  if [ $DONT_ASK_CONFIRMATION -eq 1 ]; then
+    return
+  fi
+
+  read -p "Would you like to proceed (y/n)? " confirmation
+
+  # Stop if answer is anything but "Y" or "y"
+  if [ "$confirmation" == "${confirmation#[Yy]}" ]; then
+    exit 1;
+  fi
+}
+
+# On MacOS, restarting Docker Desktop for Mac might take a long time
+poll_for_docker_readiness() {
+  # TODO: add new line at the end of polling
+  printf 'Waiting for docker engine to start:\n'
+
+  local i=0
+  while ! docker system info > /dev/null 2>&1;
+  do
+    printf '.%.0s' {1..$i}
+    i=$((i + 1))
+    sleep 1
+    tput el
+  done
+
+  printf '\n'
+}
+
+# Checks if a particular program is installed
+is_program_installed () {
+  command -v "$1" &>/dev/null
+}
+
+# Restarts the Docker engine
+restart_docker_engine () {
+  if [ $DONT_RESTART_DOCKER_ENGINE -eq 1 ]; then
+    return
+  fi
+
+  echo "👉 Restarting Docker engine"
+
+  # On MacOS, restart through "launchd"
+  if [ "$(uname)" == "Darwin" ] && is_program_installed "launchctl"; then
+    local docker_service=$(launchctl list | grep "com.docker.docker" | awk '$0 != "-" { print $3 }')
+    if [ -n "$docker_service" ]; then
+      launchctl stop "$docker_service" || true;
+    fi
+    launchctl start com.docker.helper
+    sleep 1
+    poll_for_docker_readiness
+
+  # On Linux, restart through "systemd"
+  elif [ "$(uname)" == "Linux" ] && is_program_installed "systemctl"; then
+    sudo systemctl stop docker.service || true
+    sudo systemctl start docker.service
+
+  # Other platforms are not supported
+  else
+    printf "Platform type $(uname) is not supported\n" >&2
+  fi
+}
+
+
+echo "👉 Docker disk usage"
+docker system df
+
+ask_user_for_confirmation
+
+echo "👉 Remove all stopped containers"
+docker ps --filter "status=exited" -q | xargs -r docker rm --force
+
+echo "👉 Remove all orphan image layers"
+docker images -f "dangling=true" -q | xargs -r docker rmi -f
+
+echo "👉 Remove all unused volumes"
+docker volume ls -qf dangling=true | xargs -r docker volume rm
+
+echo "👉 Remove Docker builder cache"
+DOCKER_BUILDKIT=1 docker builder prune --all --force
+
+echo "👉 Remove docker builder cache"
+
+echo "👉 Remove networks not used by at least one container"
+docker network prune --force
+
+# echo "👉 Remove unused volumes"
+# -a, --all, Remove all unused build cache, not just dangling ones
+# docker system prune --force --volumes
+
+# Run "docker/docker-reclaim-space" only on Intel chips
+# because image is not build for ARM achitecture (Apple M1 chips)
+if [ "$(uname)" == "Darwin" ] && [ "$(uname -m)" == "x86_64" ]; then
+  echo "👉 Shrink the Docker.raw file"
+  docker run --privileged --pid=host docker/desktop-reclaim-space
+fi
+
+echo "👉 Docker disk usage (after cleanup)"
+docker system df
+
+restart_docker_engine
+
+echo "🤘 Done"