Ruby gems installed from AUR leave files behind if removed again

Question

Most Ruby gems in the AUR use the PKGBUILD snippet provided by http://wiki.archlinux.org/index.php/Rub … Guidelines – now I think that using "gem install" will avoid the sandbox and also make it impossible for yaourt/clyde/… to keep track of the installed files. As a result of this, removing an installed package again (with `{yaourt,clyde,…} -R <package>` will *not* uninstall the gem, at all.
A quick test demonstrates this:
$ gem list | grep hmac
$ yaourt -S ruby-hmac
$ gem list | grep hmac
ruby-hmac (0.4.0)
$ yaourt -R ruby-hmac
$ gem list | grep hmac
ruby-hmac (0.4.0)
As you can see, the gem is still there.
Doesn't that defeat the purpose of using packages?

Answer 1

I can't reproduce this, neither with ruby-hmac nor with my own gem based ruby packages on aur (e.g. ruby-uuid or ruby-macaddr). Pacman says Installed/removed size for ruby-hmac is 0.42MB.
What's notable is that your gem version (1.3.6) is not the one currently shipped with arch's ruby package (1.3.1). Where does your gem installation come from?
On my system:
~$» pacman -Qo gem
/usr/bin/gem is owned by ruby 1.9.1_p429-1
~$» gem env
RubyGems Environment:
- RUBYGEMS VERSION: 1.3.1
- RUBY VERSION: 1.9.1 (2010-07-02 patchlevel 429) [i686-linux]
- INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.9.1
- RUBY EXECUTABLE: /usr/bin/ruby
- EXECUTABLE DIRECTORY: /usr/bin
- RUBYGEMS PLATFORMS:
- ruby
- x86-linux
- GEM PATHS:
- /usr/lib/ruby/gems/1.9.1
- /home/chenno/.gem/ruby/1.9.1
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://gems.rubyforge.org/