service

#!/bin/bash

command=${1}
service_name=${2}
invert=${3}
result=0

function serviceEnable() {
  result=1
  if [ -d "/etc/sv/${service_name}" ]; then
    if [ ! -d "/var/service/${service_name}" ]; then
      sudo ln -s /etc/sv/${service_name} /var/service/${service_name}
      if [ -d "/var/service/${service_name}" ]; then
        echo "Service ${service_name} enabled."
        result=0
      else
        echo "Error during enable ${service_name}."
      fi
    else
      echo "Service ${service_name} already enabled."
      result=0
    fi
  else
    echo "Service ${service_name} does not exists."
  fi
}

function serviceDisable() {
  result=1
  if [ -d "/var/service/${service_name}" ]; then
    sudo rm /var/service/${service_name}
    if [ ! -d "/var/service/${service_name}" ]; then
      echo "Service ${service_name} disabled."
      result=0
    else
      echo "Error during disable ${service_name}."
    fi
  else
    echo "Service ${service_name} already disabled."
    result=0
  fi
}

function serviceRestart() {
  serviceStop
  if [ ${result} -eq 0 ]; then
    serviceStart
  fi
}

function serviceStart() {
  sudo sv up ${service_name}
  result=${?}
}

function serviceStop() {
  sudo sv down ${service_name}
  result=${?}
}

function serviceStatus() {
  sudo sv status ${service_name}
  result=${?}
}

function serviceList() {
  if [[ "${service_name}" == "enabled" ]]; then
    for lname in $(ls -1 /var/service); do
      service_name=${lname}
      st_stat=$(serviceStatus | awk -F ":" '{print $1}' )
      echo "${service_name}: ${st_stat}"
    done
  elif [[ "${service_name}" == "disabled" ]]; then
    for lname in $(ls -1 /etc/sv/); do
      if [ ! -d "/var/service/${lname}" ]; then
        echo "${lname}"
      fi
    done
  else
    for lname in $(ls -1 /etc/sv/); do
      if [ ! -d "/var/service/${lname}" ]; then
        echo "${lname} - disabled"
      else
        echo "${lname} - enabled"
      fi
    done
  fi
  result=1  
}

function showHelp() {
  echo "Usage ${0} <command> <service_name>."
  echo "If command is not in supported command list the program try to invert the syntax to ${0} <service_name> <command>."
  echo "If also in this way the command is not present in supported command list you will receive an error message."
  echo
  echo "Supported commands:"
  echo " - enable: enable a service, remember that with runit the enable command also start the service."
  echo " - disable: disable a service, remember that with runit the disable command also stop the service."
  echo " - restart: restart a service."
  echo " - start: start a service, the service must be enabled."
  echo " - stop: stop a service."
  echo " - status: show the current service status."
  echo " - list [enabled|disabled]: list the status of all services, if the string \"enabled\" or \"disabled\" is passed as parameter the script show only the services that are in the status specified."
  echo " - help: print this help message."
  result=1;
}


if [[ -z "${command}" ]]; then
  command=help;
fi

case ${command} in
  enable) serviceEnable;;
  disable) serviceDisable;;
  restart) serviceRestart;;
  start) serviceStart;;
  stop) serviceStop;;
  status) serviceStatus;;
  list) serviceList;;
  help) showHelp;;
  *)
    if [[ "${invert}" == "false" ]]; then
      echo "Error: Command \"${command}\" or \"${service_name}\" not found."
      echo
      showHelp
      result=0
    else
      ${0} ${service_name} ${command} "false"
    fi
    ;;
esac

exit ${result}