ruby/rubygems · error · Gem::CommandLineError

Expected GEM_NAME and GEM_VERSION arguments (gem rebuild GEM

Error message

Expected GEM_NAME and GEM_VERSION arguments (gem rebuild GEM_NAME GEM_VERSION)

What it means

Error "Expected GEM_NAME and GEM_VERSION arguments (gem rebuild GEM_NAME GEM_VERSION)" thrown in ruby/rubygems.

Source

Thrown at lib/rubygems/commands/rebuild_command.rb:183

  def prep_dirs
    rebuild_dir = Dir.mktmpdir("gem_rebuild")
    old_dir = File.join(rebuild_dir, "old")
    new_dir = File.join(rebuild_dir, "new")

    FileUtils.mkdir_p(old_dir)
    FileUtils.mkdir_p(new_dir)

    [old_dir, new_dir]
  end

  def get_gem_name_and_version
    args = options[:args] || []
    if args.length == 2
      gem_name, gem_version = args
    elsif args.length > 2
      raise Gem::CommandLineError, "Too many arguments"
    else
      raise Gem::CommandLineError, "Expected GEM_NAME and GEM_VERSION arguments (gem rebuild GEM_NAME GEM_VERSION)"
    end

    [gem_name, gem_version]
  end

  def build_gem(gem_name, source_date_epoch, output_file)
    gemspec = options[:gemspec_file] || find_gemspec("#{gem_name}.gemspec")

    if gemspec
      build_package(gemspec, source_date_epoch, output_file)
    else
      alert_error error_message(gem_name)
      terminate_interaction(1)
    end
  end

  def build_package(gemspec, source_date_epoch, output_file)
    with_source_date_epoch(source_date_epoch) do

View on GitHub (pinned to 86cbb817a3)

When it happens

Trigger: Thrown at lib/rubygems/commands/rebuild_command.rb:183 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ruby/rubygems@86cbb817a3 (2026-08-23). Data as JSON: /api/errors/5b06f0521c7e3e2a. Report an issue: GitHub.