Installs Berkshelf API with RVM and bash. You should source the file

run_berks_api.sh

#!/bin/bash --login
# Installs Berks API, assuming you use rvm.
export BAPI_GEMSET='berks-api'
export BAPI_VERSION='2.1.0'
export GOD_VERSION='0.13.4'
export GOD_FILE_URL='https://gist.githubusercontent.com/Chili-Man/7191c5ba846f95a93759/raw/12d071029ee2562057204d6565475895abf171b0/BerkshelAPI.god.rb'
export GOD_FILE_PATH='BerkshelfAPI.god.rb'
export GOD_LOG_PATH='god.log'
export GOD_BAPI_PROC_NAME='BerkshelfAPI'

function rvm_installed() {
    rvm -v &> /dev/null
    if [ "$?" -ne 0 ]; then
	echo 'rvm is not installed'
	return 1
    fi
}

function berks_api_installed() {
    berks-api -v &> /dev/null
    if [ "$?" -ne 0 ]; then
	echo 'berks-api is not installed'
	return 1
    fi
}

function gemset_exists() {
    gemset=$1
    if [ -z "$gemset" ]; then gemset="$BAPI_GEMSET"; fi

    rvm gemset list | grep "$gemset" &> /dev/null
}

function create_gemset() {
    gemset=$1
    if [ -z "$gemset" ]; then gemset="$BAPI_GEMSET"; fi

    rvm gemset create "$gemset"
}

function load_gemset() {
    gemset=$1
    if [ -z "$gemset" ]; then gemset="$BAPI_GEMSET"; fi

    rvm gemset use "$gemset"
}

function install_berks_api() {
    gemset=$1
    bapi_version=$2
    god_version=$3
    if [ -z "$gemset" ]; then gemset="$BAPI_GEMSET"; fi
    if [ -z "$bapi_version" ]; then bapi_version="$BAPI_VERSION"; fi
    if [ -z "$god_version" ]; then god_version="$GOD_VERSION"; fi

    gemset_exists "$gemset"
    if [ "$?" -ne 0 ]; then create_gemset "$gemset"; fi

    load_gemset "$gemset"
    gem install god --version "$god_version"
    gem install berkshelf-api --version "$bapi_version"
}

function berks_api_running() {
    god_bapi_proc_name=$1
    if [ -z "$god_bapi_proc_name"]; then god_bapi_proc_name=$GOD_BAPI_PROC_NAME; fi

    god status "$god_bapi_proc_name" &> /dev/null
}

function god_running() {
    god status &> /dev/null
}

function run_berks_api() {
    god_file_path=$1
    god_log_path=$2
    if [ -z "$god_file_path" ]; then god_file_path="$GOD_FILE_PATH"; fi
    if [ -z "$god_log_path" ]; then god_log_path="$GOD_LOG_PATH"; fi

    if [ ! -f "$god_file_path" ]; then
	curl -s -o "$god_file_path" "$GOD_FILE_URL"
    fi

    berks_api_running
    bapi_is_running=$?

    god_running
    god_is_running=$?

    if [ "$god_is_running" -ne 0 ] && [ "$bapi_is_running" -ne 0 ]; then
	# God and Berks API are not running
	echo "Starting god and berks api . . ."
	god -c "$god_file_path" -l "$god_log_path"

    elif [ "$god_is_running" -eq 0 ] && [ "$bapi_is_running" -ne 0 ]; then
	# God is running but the Berks API is not running
	echo "Starting the Berkshelf API"
	god load "$god_file_path"

    else
	echo "It seems that the Berkshelf API is already running"
    fi
}

# Install The Berks API
rvm_installed
has_rvm=$?

berks_api_installed
has_bapi=$?

if [ "$has_rvm" -eq 0 ] && [ "$has_bapi" -ne 0 ]; then
    echo 'installing the berkshelf api'
    install_berks_api
fi

# Run the Berks API
run_berks_api