client_management/lib/tasks/change_site_server_name.rake

require 'net/ssh'
require 'pathname'
namespace :create_site do
  desc "Change Site Server Name"
  task :change_site_server_name,[:id,:server_name] => :environment do |task,args|
    begin
      site_construct = SiteConstruct.find(args.id)
      site_server = site_construct.site_server
      if !site_server.nil?
        @password = site_server.password
        Net::SSH.start(site_server.ip , site_server.account , password: site_server.password) do |ssh|
          nginx_file_content = exec_command_by_user(ssh,"cat #{site_construct.nginx_file}")
          nginx_file_content = nginx_file_content.gsub(/^[ \t]*server_name[ \t]+.*;/,"  server_name #{args.server_name};").gsub('$','\$')
          puts nginx_file_content
          cmd = "x='#{nginx_file_content}'; echo '#{@password}' | sudo -S sh -c \"echo '$x' > #{site_construct.nginx_file}\""
          exec_command_by_user(ssh,cmd)
          exec_ssh_command_by_sudo(ssh,"service nginx restart")
        end
        site_construct.update_attributes(domain_name: args.server_name)
      end
    rescue => e
      puts [e,e.backtrace]
    end
  end
  def exec_command_by_user(session,command)
    output = session.exec!(command)
    return output
  end
  def exec_ssh_command_by_sudo(session,command)
    output = session.exec!("echo '#{@password}' | sudo -S #{command}")
    if output.include?("sudo:") && output.include?("command not found")
      output = session.exec!(command)
    end
    return output
  end
end