Installer file for picrate-2.0

picrate2_install.sh

#!/usr/bin/env bash
# Bash Script to install PiCrate and dependencies on Raspbian Buster
JAVA_PATH="/usr/lib/jvm/java-11-openjdk-armhf"
JRUBY_VERSION="9.3.0.0
MRI_RUBY="2.6.0"
JRUBY_PATH="/opt/jruby-${JRUBY_VERSION}"
GEM_RC="${HOME}/.gemrc"
GEM="${HOME}/.gem/ruby/${MRI_RUBY}"
JDK_PROFILE="/etc/profile.d/jdk_home.sh"
JDK_STRING="export JAVA_HOME=\$(readlink -f /usr/bin/javac | sed \"s:/bin/javac::\")"

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

gem_rc

function java_home {
  if [[ (-n ${JAVA_HOME}) ]]
  then
    echo "${JAVA_HOME}"
  else
    sudo touch "$JDK_PROFILE"
    echo "${JDK_STRING}" | sudo tee -a "${JDK_PROFILE}"
  fi
}

java_home

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"
}

wget_jruby

function install_jruby_links {
  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_links

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

install_picrate