install_gems

# File lib/rubygems/commands/install_command.rb, line 292
  def install_gems # :nodoc:
    exit_code = 0

    get_all_gem_names_and_versions.each do |gem_name, gem_version|
      gem_version ||= options[:version]

      begin
        install_gem gem_name, gem_version
      rescue Gem::InstallError => e
        alert_error "Error installing #{gem_name}:\n\t#{e.message}"
        exit_code |= 1
      rescue Gem::GemNotFoundException, Gem::UnsatisfiableDependencyError => e
        domain = options[:domain]
        domain = :local unless options[:suggest_alternate]
        show_lookup_failure e.name, e.version, e.errors, domain

        exit_code |= 2
      end
    end

    exit_code
  end