Auto Installer for picrate-2.5.0

picrate13_install.sh

#!/usr/bin/env bash
# Bash Script to install PiCrate and dependencies on Raspbian Buster
# JAVA_PATH="/opt/jdk13"
# JAVA_PATH="/usr/lib/jvm/java-8-openjdk-armhf"
JAVA_PATH="/usr/lib/jvm/java-11-openjdk-armhf"
JRUBY_VERSION="9.0.0.0"
MRI="2.5.0"
JRUBY_PATH="/opt/jruby-${JRUBY_VERSION}"
GEM="${HOME}/.gem/ruby/${MRI}"
GEMRC="${HOME}/.gemrc"
PROFILD="/etc/profile.d/jdk_home.sh"
JHOME="export JAVA_HOME=\$(readlink -f /usr/bin/javac | sed \"s:/bin/javac::\")"

function install_java {
  if [ -x "$(command -v java)" ]
  then
    java -version
  else
    local commands=(update upgrade)
    for cmd in "${commands[@]}"
    do # update before install
    sudo apt-get "${cmd}"
  done
  echo "Installing openjdk-11"
  sudo apt-get install openjdk-11-jdk
fi
}

install_java

function wget_jruby {
  wget "https://repo1.maven.org/maven2/org/jruby/jruby-dist/${JRUBY_VERSION}/jruby-dist-${JRUBY_VERSION}-bin.tar.gz"
  sudo tar xzvf "${HOME}/jruby-dist-${JRUBY_VERSION}-bin.tar.gz" -C /opt
  echo "Downloaded JRuby"
  if [[ (-n ${JAVA_HOME}) ]]
  then
    echo "JAVA_HOME=${JAVA_HOME}"
  else
    echo "Run attached script.sh as follows"
    echo "sudo bash script.sh" 
  fi
}

wget_jruby

function install_jruby {
  local commands=(jruby jgem jirb)
  for cmd in "${commands[@]}"
  do
    sudo update-alternatives --install /usr/bin/"${cmd}" "${cmd}" "${JRUBY_PATH}/bin/${cmd}" 100
  done
}

install_jruby

function create_gem_home {
  if [[ (-n ${GEM_HOME}) ]]
  then
    echo "GEM_HOME=${GEM_HOME}"
  else
    mkdir -p "${GEM}"
    commands=(
    "GEM_HOME=${GEM}"
    "GEM_PATH=${GEM}"
    "PATH=\"\${GEM_PATH}/bin:\${PATH}\""
    )
    for cmd in "${commands[@]}"
    do
      echo "export ${cmd}" >> ~/.profile
    done
  fi
}

create_gem_home


function no_docs {
  if [[ (-f ${GEMRC}) ]]
  then
    cat "${GEMRC}"
  else
    touch "${GEMRC}"
    echo "gem: --no-document" >> "${GEMRC}"
  fi
}

no_docs

function install_picrate {
  export GEM_HOME="${GEM}"
  export PATH="${GEM}"/bin:"${PATH}"
  jgem install rake
  jgem install picrate
}

install_picrate

script.sh

# run this script with sudo
PROFILD="/etc/profile.d/jdk_home.sh"
JHOME="export JAVA_HOME=\$(readlink -f /usr/bin/javac | sed \"s:/bin/javac::\")"
echo "Setting JAVA_HOME automagically on next boot"
sudo touch "${PROFILD}"
sudo echo "${JHOME}" > "${PROFILD}"