Method: LibGems::Installer#extract_files

Defined in:
lib/libgems/installer.rb

#extract_files ⇒ Object

Reads the file index and extracts each file into the gem directory.

Ensures that files can’t be installed outside the gem directory.

Raises:

  • (ArgumentError) 


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# File 'lib/libgems/installer.rb', line 572

def extract_files
  @gem_dir = File.expand_path @gem_dir

  raise ArgumentError, "format required to extract from" if @format.nil?

  dirs = []

  @format.file_entries.each do |entry, file_data|
    path = entry['path'].untaint

    if path =~ /\A\// then # for extra sanity
      raise LibGems::InstallError,
            "attempt to install file into #{entry['path'].inspect}"
    end

    path = File.expand_path File.join(@gem_dir, path)

    if path !~ /\A#{Regexp.escape @gem_dir}/ then
      msg = "attempt to install file into %p under %p" %
              [entry['path'], @gem_dir]
      raise LibGems::InstallError, msg
    end

    FileUtils.rm_rf(path) if File.exists?(path)

    dir = File.dirname(path)
    if !dirs.include?(dir)
      dirs << dir
      FileUtils.mkdir_p dir
    end

    File.open(path, "wb") do |out|
      out.write file_data
    end

    FileUtils.chmod entry['mode'], path

    say path if LibGems.configuration.really_verbose
  end
end