generate_nginx_site_config.rb

#!/usr/bin/env ruby

require 'optparse'
require 'erb'

class GeneratesConfig
  attr_accessor :repo_dir, :output_file, :host, :port

  def initialize
    @host = "localhost"
  end

  def generate
    raise "Unable to generate config" unless repo_dir && output_file
    @name = File.basename(repo_dir)
    @server_name = @name
    @host_name = "#{@server_name}.teladoc.dev"
    @hostname_with_port = "http://#{host}:#{port}"
    output = ERB.new(File.read("./nginx.conf.erb")).result(binding)
    File.write(output_file, output)
  end
end

config_generator = GeneratesConfig.new
OptionParser.new do |options|
  options.on("-h", "--host", "Hostname to proxy through nginx") do |host|
    config_generator.host = host
  end
  options.on("-p", "--port PORT", "Hostname to proxy through nginx") do |port|
    config_generator.port = port
  end
  options.on("-d", "--dir DIR", "Repository directory for the application you want to proxy through nginx") do |repo_dir|
    config_generator.repo_dir = repo_dir
  end
  options.on("-o", "--outfile FILE", "Output location for the file that will contain the nginx config") do |output_file|
    config_generator.output_file = output_file
  end
end.parse!

config_generator.generate

nginx.conf.erb

upstream <%= @server_name %> {
 server <%= @hostname_with_port %>;
}

server {
  access_log /usr/local/var/log/nginx/<%= @name %>.access.log main;
  listen 80;
  root <%= @repo_dir %>/public;
  server_name <%= @host_name %> *.<%= @host_name %>;

  client_max_body_size 50M;
  error_page 500 502 503 504 /50x.html;

  location = /50x.html {
    root html;
  }

  try_files $uri/index.html $uri @<%= @server_name %>;
  location @<%= @server_name %> {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://<%= @server_name %>;
  }
}