Pipeline Script to install rbenv, rbenv gemset and ruby-build

rbenv.sh

#!/bin/bash
# Bash script to check if rbenv is installed along with a few necessities and if they don't exist
# to install them

TEST_RUBY_VERSION="2.6.3"

install_rbenv() {
  echo "--- :construction: Installing Rbenv"
  # Clone rbenv from Github
  git clone https://github.com/rbenv/rbenv.git "$HOME/.rbenv" > /dev/null 2>&1

  # Configure the shell
  # shellcheck disable=SC2016
  echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> "$HOME/.bash_profile"

  # Initialize rbenv
  "$HOME/.rbenv/bin/rbenv" init

  # Automatically start rbenv
  # shellcheck disable=SC2016
  echo 'eval "$(rbenv init -)"' >> "$HOME/.bash_profile"

  # shellcheck disable=SC1090
  source ~/.bash_profile
}

install_gemset() {
  echo "--- :construction: Installing Rbenv Gemset plugin"
  git clone git://github.com/jf/rbenv-gemset.git "$HOME/.rbenv/plugins/rbenv-gemset" > /dev/null 2>&1
}

install_rubybuild() {
  # Install dependencies
  #sudo yum groupinstall "Development Tools"
  echo "--- :construction: Installing Dependencies for Ruby-build"
  yum install -y gcc make tar bzip2 openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel > /dev/null 2>&1

  echo "--- :construction: Installing Ruby-build"
  # Setup the plugin
  mkdir -p "$(rbenv root)"/plugins
  git clone https://github.com/rbenv/ruby-build.git "$HOME/.rbenv/plugins/ruby-build" > /dev/null 2>&1

  # Configure Rubygems for speed
  echo -e "gem: --no-document\nbenchmark: false\nverbose: false\nupdate_sources: true\nbacktrace: true\nsources:\n- https://rubygems.org" > "$HOME/.gemrc"

  if [ -d "$HOME/.rbenv/versions/$TEST_RUBY_VERSION" ]; then
    exit
  else
    test_rubybuild
  fi
}

test_rubybuild() {
  echo "--- :construction: Installing Ruby $TEST_RUBY_VERSION"
  # Test installing Ruby $TEST_RUBY_VERSION
  rbenv install $TEST_RUBY_VERSION
}

command -v git >/dev/null 2>&1 || { echo >&2 "--- :stop: Git is required to run this script, but it's not installed.  Exiting"; exit 1; }

# Check if rbenv is available
if [ -d "$HOME/.rbenv" ]; then
  echo "--- :large_green_circle: Rbenv is available"
  # rbenv is available, is ruby-build?
  if [ -d "$HOME/.rbenv/plugins/ruby-build" ]; then
    echo "--- :large_green_circle: Ruby-build is available"
  else
    install_ruby-build
  fi
  # rbenv is available, is rbenv-gemset?
  if [ -d "$HOME/.rbenv/plugins/rbenv-gemset" ]; then
    echo "--- :large_green_circle: Rbenv-gemset is available"
  else
    install_gemset
  fi
else
  # Nothing is installed, so we install everything
  install_rbenv
  install_rubybuild
  install_gemset
fi