docker-netshoot

#!/bin/bash

set -euo pipefail

NETSHOOT_IMAGE="nicolaka/netshoot"

usage() {
  echo "Run netshoot container with docker network."
  echo "Options:"
  printf "\t%s\t\t%s\n" "-h" "print this help"
  printf "\t%s\t%s\n" "-n NETWORK" "user provided network"
  printf "\t%s\t\t%s\n" "-N" "user default network"
}

select_network() {
  docker network ls | fzf \
    --header-lines=1 \
    --select-1 --exit-0 \
    --preview-label="Containers" \
    --preview-window=down,10 \
    --preview "docker network inspect {1} | jq -r '.[].Containers | .[].Name'" | awk '{print $1}'
}

main() {
  local network=
  while getopts "hNn:" opt; do
    case "${opt}" in
    h)
      usage
      exit
      ;;
    N)
      network="default"
      ;;
    n)
      network="$OPTARG"
      ;;
    *)
      usage
      exit 1
      ;;
    esac
  done
  shift $((OPTIND - 1))

  if [ -z "$network" ]; then
    network=$(select_network)
  fi
  docker run --interactive --tty --rm --network "$network" "$NETSHOOT_IMAGE"
}

main "$@"