Tech Summit Pre-Requisites Checker

prerequisites.sh

#!/bin/bash --login

set -o nounset

export EXPECTED_RUBY_VERSION="1.9.3"
export EXPECTED_RBENV_RUBY_VERSION="1.9.3-p545"

logError () {
	logCustom 1 "ERROR: $1"

	echo ">>>>>>>>>> End time: $(date) <<<<<<<<<<<<"
	exit 1
}

logSuccess () {
	logCustom 2 "SUCCESS: $1"	
}

logInfo () {
	logCustom 3 "INFO: $1"
}

logCustom () {
	tput setaf $1
	echo "$2"
	tput sgr 0	
}

# Verify if Homebrew is installed
BREW_INSTALLED=`which brew`
if [ -z $BREW_INSTALLED ]; then
	logError "Looks like you haven't started the work to satisfy pre-requisites!"
else
	BREW_VERSION=`brew -v`
	logInfo "Homebrew found. Version: $BREW_VERSION"
fi

# Verify if XCode is installed
XCODE_INSTALLED=`xcode-select -p`
if [ -z $XCODE_INSTALLED ]; then
	logError "You should have downloaded Xcode; its a 2GB file - better get moving"
else
	logInfo "Xcode is installed. Great!"
fi

# Verify if Git is installed
GIT_INSTALLED=`which git`
if [ -z $GIT_INSTALLED ]; then
	logError "Please run 'brew install git'"
else
	logInfo "Git is installed. Good work."
fi

# Verify if ruby is installed using rvm
RVM_INSTALLED=`which rvm`
if [ -z $RVM_INSTALLED ]; then
	logInfo "You're not using rvm. This is expected."
else
	logInfo "rvm is installed; it may be save to ignore subsequent messages that show errors because you're not using rbenv"
fi

# Verify if ruby is installed using rbenv
RB_ENV_INSTALLED=`which rbenv`
if [ -z $RB_ENV_INSTALLED ]; then
	logInfo "Rbenv is not found, please install it using 'brew install rbenv'"
else
	logInfo "Rbenv is installed"
fi

# Verify if Ruby is on the path
RUBY_VERSION_INSTALLED=`ruby -v`
if echo "$RUBY_VERSION_INSTALLED" | grep -q "$EXPECTED_RUBY_VERSION"; then
	logInfo "Yay!! You have Ruby 1.9.3 installed"
else
	logInfo "Your Ruby version is: $RUBY_VERSION_INSTALLED"
fi

# Verify if Ruby 1.9.3-p545 is installed using rbenv
RUBY_VERSION_INSTALLED=`rbenv versions | grep 1.9.3-p545`
if echo "$RUBY_VERSION_INSTALLED" | grep -q "$EXPECTED_RUBY_VERSION"; then
	logInfo "Yay!! You have Ruby 1.9.3-p545 installed via rbenv"
else
	logError "Ruby 1.9.3-p545 not found. Please run 'rbenv install 1.9.3-p545'"
fi

logInfo "Thanks! You have installed all the pre-requisites."