Class: Gem::Commands::PristineCommand

# File 'lib/rubygems/commands/pristine_command.rb', line 55

def defaults_str # :nodoc:
  '--extensions'
end

# File 'lib/rubygems/commands/pristine_command.rb', line 59

def description # :nodoc:
  <<-EOF
The pristine command compares an installed gem with the contents of its
cached .gem file and restores any files that don't match the cached .gem's
copy.

If you have made modifications to an installed gem, the pristine command
will revert them.  All extensions are rebuilt and all bin stubs for the gem
are regenerated after checking for modifications.

If the cached gem cannot be found it will be downloaded.

If --no-extensions is provided pristine will not attempt to restore a gem
with an extension.

If --extensions is given (but not --all or gem names) only gems with
extensions will be restored.
  EOF
end

# File 'lib/rubygems/commands/pristine_command.rb', line 83

def execute
  specs = if options[:all] then
            Gem::Specification.map

          # `--extensions` must be explicitly given to pristine only gems
          # with extensions.
          elsif options[:extensions_set] and
                options[:extensions] and options[:args].empty? then
            Gem::Specification.select do |spec|
              spec.extensions and not spec.extensions.empty?
            end
          else
            get_all_gem_names.sort.map do |gem_name|
              Gem::Specification.find_all_by_name(gem_name, options[:version]).reverse
            end.flatten
          end

  if specs.to_a.empty? then
    raise Gem::Exception,
          "Failed to find gems #{options[:args]} #{options[:version]}"
  end

  install_dir = Gem.dir # TODO use installer option

  raise Gem::FilePermissionError.new(install_dir) unless
    File.writable?(install_dir)

  say "Restoring gems to pristine condition..."

  specs.each do |spec|
    if spec.default_gem?
      say "Skipped #{spec.full_name}, it is a default gem"
      next
    end

    if spec.name == options[:skip]
      say "Skipped #{spec.full_name}, it was given through options"
      next
    end

    if spec.bundled_gem_in_old_ruby?
      say "Skipped #{spec.full_name}, it is bundled with old Ruby"
      next
    end

    unless spec.extensions.empty? or options[:extensions] or options[:only_executables] then
      say "Skipped #{spec.full_name}, it needs to compile an extension"
      next
    end

    gem = spec.cache_file

    unless File.exist? gem or options[:only_executables] then
      require 'rubygems/remote_fetcher'

      say "Cached gem for #{spec.full_name} not found, attempting to fetch..."

      dep = Gem::Dependency.new spec.name, spec.version
      found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dep

      if found.empty?
        say "Skipped #{spec.full_name}, it was not found from cache and remote sources"
        next
      end

      spec_candidate, source = found.first
      Gem::RemoteFetcher.fetcher.download spec_candidate, source.uri.to_s, spec.base_dir
    end

    env_shebang =
      if options.include? :env_shebang then
        options[:env_shebang]
      else
        install_defaults = Gem::ConfigFile::PLATFORM_DEFAULTS['install']
        install_defaults.to_s['--env-shebang']
      end

    installer_options = {
      :wrappers => true,
      :force => true,
      :install_dir => spec.base_dir,
      :env_shebang => env_shebang,
      :build_args => spec.build_args,
    }

    if options[:only_executables] then
      installer = Gem::Installer.for_spec(spec, installer_options)
      installer.generate_bin
    else
      installer = Gem::Installer.at(gem, installer_options)
      installer.install
    end

    say "Restored #{spec.full_name}"
  end
end

# File 'lib/rubygems/commands/pristine_command.rb', line 79

def usage # :nodoc:
  "#{program_name} [GEMNAME ...]"
end