Kong one-file installer script, with OS auto-detection.

install-kong.sh

#!/bin/bash

set -o errexit

# Force bash
if [ -z "$BASH_VERSION" ]
then
  exec bash "$0" "$@"
fi

######################
#  Kong Information  #
######################

KONG_VERSION="0.4.1"
DEB_DEPENDENCIES="lsb-release netcat lua5.1 openssl libpcre3 dnsmasq curl sudo"
RPM_DEPENDENCIES="epel-release curl sudo"

#######################
#  Utility functions  #
#######################

is_sudo() {
  if [ "$(id -u)" == "0" ]; then
    return 0
  else
    return 1
  fi
}

cmd_exists() {
  if hash $1 2>/dev/null; then
    return 0
  else
    return 1
  fi
}

msg() { 
  str=$@
  printf "\033[0;32m$str\033[0m\n" 1>&3 2>&4 # Green color
}

err() {
  str=$@
  printf "\033[0;31m$str\033[0m\n" 1>&3 2>&4 # Red color
  exit 1
}

VERBOSE=1
exec 3>&1
exec 4>&2
if ! ((VERBOSE)); then
  exec 1>/dev/null
  exec 2>/dev/null
fi

#######################
#      Main Logic     #
#######################

if ! is_sudo && [ "$(uname)" != "Darwin" ]; then
  err "You need to run the script as root"
elif ! is_sudo; then
  SUDO="sudo"
fi

msg "Installing Kong $KONG_VERSION - It may take a while.."

if [ "$(uname)" = "Darwin" ]; then
  if cmd_exists brew; then
    msg "Installing with HomeBrew"
    # Install with HomeBrew
    brew tap mashape/kong

    msg "Installation in progress.."

    brew install kong
  else
    msg "Downloading Kong files"
    # Install with OSX package
    file_name="kong-${KONG_VERSION}.osx.pkg"
    curl -L -o /tmp/${file_name} -O https://github.com/Mashape/kong/releases/download/${KONG_VERSION}/${file_name}
    open /tmp/${file_name}
    msg "Kong graphical installer opened. Follow the wizard to complete the installation.."
  fi
elif cmd_exists yum; then
  msg "Installing dependencies: "$RPM_DEPENDENCIES
  $SUDO yum install -y $RPM_DEPENDENCIES

  centos_version=`cat /etc/redhat-release | grep -oE '[0-9]+\.[0-9]+'`
  file_name="kong-${KONG_VERSION}.el${centos_version%.*}.noarch.rpm"
  file_url="https://github.com/Mashape/kong/releases/download/${KONG_VERSION}/${file_name}"
  msg "Downloading Kong: ${file_url}"
  curl -L -o /tmp/${file_name} ${file_url}

  msg "Installation in progress.."
  $SUDO yum install -y /tmp/${file_name} --nogpgcheck

  # Cleaning up
  rm /tmp/${file_name}
elif cmd_exists apt-get; then
  msg "Installing dependencies: "$DEB_DEPENDENCIES
  $SUDO apt-get update
  $SUDO apt-get install -y $DEB_DEPENDENCIES

  debian_version=`lsb_release -cs`
  file_name="kong-${KONG_VERSION}.${debian_version}_all.deb"
  file_url="https://github.com/Mashape/kong/releases/download/${KONG_VERSION}/${file_name}"
  msg "Downloading Kong: ${file_url}"
  curl -L -o /tmp/${file_name} ${file_url}

  msg "Installation in progress.."
  $SUDO dpkg -i /tmp/${file_name}

  # Cleaning up
  rm /tmp/${file_name}
else
  err "Unsupported platform"
fi

msg "Checking installed version: "`kong version`

msg "Done!"