Bash script to install puppet on Ubuntu 16.04. Puppet can then be used to provision the machine.

puppify.sh

#!/bin/bash

if [ "$(id -u)" != "0" ]; then
  echo "This script must be run as root." >&2
  exit 1
fi

PROVISION_REPO=$1
BRANCH=$2
if [ "$#" -ne 2 ]; then
  echo "Usage: $0 PROVISION_REPO BRANCH"
  exit 1
fi

PUPPET_BIN=/opt/puppetlabs/puppet/bin
PUPPET_ENV=/etc/puppetlabs/code/environments

which wget > /dev/null 2>&1
WGET_CHECK=$?

which git > /dev/null 2>&1
GIT_CHECK=$?

test -f ${PUPPET_BIN}/puppet
PUPPET_CHECK=$?

if [ ${WGET_CHECK} == "1" ] || [ ${GIT_CHECK} == "1" ] || [ ${PUPPET_CHECK} == "1" ]; then
  echo "Initial apt-get update..."
  apt-get update >/dev/null
fi

if [ ${WGET_CHECK} == "1" ]; then
  echo "Installing wget..."
  apt-get --yes install wget >/dev/null
  echo "Wget installed."
fi

if [ ${GIT_CHECK} == "1" ]; then
  echo "Installing git..."
  apt-get --yes install git >/dev/null
  echo "Git installed."
fi

if [ ${PUPPET_CHECK} == "1" ]; then
  echo "Configuring PuppetLabs repo..."

  source /etc/lsb-release
  apt-key adv --fetch-keys http://apt.puppetlabs.com/DEB-GPG-KEY-puppet >/dev/null

  TMP_DEB=$(mktemp)
  wget --output-document=${TMP_DEB} http://apt.puppetlabs.com/puppetlabs-release-pc1-${DISTRIB_CODENAME}.deb 2>/dev/null
  dpkg -i ${TMP_DEB} >/dev/null
  apt-get update >/dev/null

  echo "Installing puppet..."
  apt-get --yes install puppet-agent >/dev/null
  unlink ${TMP_DEB}
  echo "Puppet installed."
fi

if [ ! -d ${PUPPET_ENV}/production.orig ]; then
  mv ${PUPPET_ENV}/production ${PUPPET_ENV}/production.orig
fi

if [ ! -d ${PUPPET_ENV}/production ]; then
  echo "Installing puppet manifests..."
  cd ${PUPPET_ENV}
  git clone -q ${PROVISION_REPO} production
  cd production
  git checkout -q ${BRANCH}

  ${PUPPET_BIN}/gem install r10k --no-rdoc --no-ri >/dev/null
  [ -f Puppetfile ] && ${PUPPET_BIN}/r10k puppetfile install >/dev/null
  
  echo "Puppet manifests installed."

  echo "Provisioning..."
  ${PUPPET_BIN}/puppet apply --environment=production ${PUPPET_ENV}/production/manifests/ >/dev/null
  echo "Done."
fi

How would you update this script If you have a private repository ? Thanks