Wrapper to handle Docker TLS connection flags

dkr.sh

#!/bin/bash

usage () {
  cat << EOF
Usage: dkr HOSTNAME
       dkr HOSTNAME COMMAND [arg...]

A wrapper around Docker to simplify using TLS connections

In the first form, will watch the output of "docker ps" and "docker images" on the remote host.
In the second form, will execute whichever Docker command is specified.

EOF
}

main () {
  local fqdn="${1}"
  local cmd="${@:2}"

  case $fqdn in
    '--help')
      usage
      exit 0
      ;;
    *)
      local dkr="docker -H ${fqdn}:2376"
      export DOCKER_TLS_VERIFY=1
  esac

  if [[ -z ${cmd} ]]
  then
    exec watch "${dkr} ps ; ${dkr} images"
  else
    exec ${dkr} ${cmd}
  fi

  exit 0

}

main "$@"