# File lib/bundler.rb, line 159
    def user_home
      @user_home ||= begin
        home = Bundler.rubygems.user_home
        bundle_home = home ? File.join(home, ".bundle") : nil

        warning = if home.nil?
          "Your home directory is not set."
        elsif !File.directory?(home)
          "`#{home}` is not a directory."
        elsif !File.writable?(home) && (!File.directory?(bundle_home) || !File.writable?(bundle_home))
          "`#{home}` is not writable."
        end

        if warning
          Kernel.send(:require, "etc")
          user_home = tmp_home_path(Etc.getlogin, warning)
          Bundler.ui.warn "#{warning}\nBundler will use `#{user_home}' as your home directory temporarily.\n"
          user_home
        else
          Pathname.new(home)
        end
      end
    end