gem uninstall with more than one argument fails

[vandrijevik]

Environment:

[vladimir@fermat:~/Code]$ ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.7.0]
[vladimir@fermat:~/Code]$ gem -v
1.8.5

[vladimir@fermat:~/Code]$ gem list refinery

*** LOCAL GEMS ***

refinerycms-images (1.0.0)
refinerycms-pages (1.0.0)
refinerycms-resources (1.0.0)
refinerycms-settings (1.0.0)

Attempting to uninstall more than one gem at the same time results in the first gem being uninstalled, and a Gem::InstallError on the second one:

[vladimir@fermat:~/Code]$ gem uninstall refinerycms-images refinerycms-pages
Successfully uninstalled refinerycms-images-1.0.0
ERROR:  While executing gem ... (Gem::InstallError)
    cannot uninstall, check `gem list -d refinerycms-pages`

However, without making any changes, running:

[vladimir@fermat:~/Code]$ gem uninstall refinerycms-pages
Successfully uninstalled refinerycms-pages-1.0.0

immediately afterwards uninstalls the second gem without any problems.

This occurs for any two gems (whether they have mutual dependencies or not), so uninstall seems to be broken for removing more than one gem at the same time.

[wapcaplet]

Ditto. Example:

$ ruby -v
ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-linux]
$ gem -v
1.8.5

$ gem list cucumber
*** LOCAL GEMS ***
cucumber (1.0.0)
cucumber-rails (0.5.1)

$ gem uninstall cucumber cucumber-rails -aIx
Removing cucumber
Successfully uninstalled cucumber-1.0.0
ERROR:  While executing gem ... (Gem::InstallError)
    cannot uninstall, check `gem list -d cucumber-rails`

$ gem uninstall cucumber-rails -aIx
Successfully uninstalled cucumber-rails-0.5.1

The only workaround I have found is to uninstall gems one by one, which is very tedious.

[blackwinter]

I've tracked it down to the following:

1. I have /usr/lib/ruby/gems/1.8 and ~/.gem/ruby/1.8 in my GEM PATHS
2. For the first gem, Gem::Uninstaller#initialize effectively calls Gem.use_paths '~/.gem/ruby/1.8', '/usr/lib/ruby/gems/1.8' which sets Gem.dir to ~/.gem/ruby/1.8
3. For the second gem, Gem::Uninstaller#initialize effectively calls Gem.use_paths '~/.gem/ruby/1.8', '~/.gem/ruby/1.8', because Gem.dir is now ~/.gem/ruby/1.8

Not sure what a fix should look like. I'm not too familiar with the code base and it feels like Gem.dir and Gem.path are mixed up in several places (gem cleanup has a similar problem; see #153). Comments in the source seem to indicate that this is something that is going to be refactored.

Workaround: gem uninstall --no-user-install ...

[blackwinter]

Not sure if 3653f2c was supposed to fix this (it says "Fixed uninstalling multiple gems using gem uninstall"), but for me the issue remains. Tests pass, though.

[vandrijevik]

1.8.9 fixes this issue for me.

[blackwinter]

Definitely not the case here:

$ gem192 install exifr xmp
Fetching: exifr-1.0.6.gem (100%)
Successfully installed exifr-1.0.6
Fetching: xmp-0.2.0.gem (100%)
Successfully installed xmp-0.2.0
2 gems installed
$ gem192 uninstall -x xmp exifr
Successfully uninstalled xmp-0.2.0
ERROR:  While executing gem ... (Gem::InstallError)
    gem "exifr" is not installed
$ gem192 uninstall -x exifr
Removing exifr
Successfully uninstalled exifr-1.0.6

It seems, the only thing this update did for me was break the workaround :(

P.S.:

$ gem192 env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.9
  - RUBY VERSION: 1.9.2 (2011-07-09 patchlevel 290) [x86_64-linux]
  - INSTALLATION DIRECTORY: /home/jw/.multiruby/install/mri_1_9_2/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: /home/jw/.multiruby/install/mri_1_9_2/bin/ruby
  - EXECUTABLE DIRECTORY: /home/jw/.multiruby/install/mri_1_9_2/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /home/jw/.multiruby/install/mri_1_9_2/lib/ruby/gems/1.9.1
     - /home/jw/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gem" => "--no-ri --no-rdoc"
     - :sources => ["http://rubygems.org/", "http://prometheus-app.uni-koeln.de/rubygems/"]
  - REMOTE SOURCES:
     - http://rubygems.org/
     - http://prometheus-app.uni-koeln.de/rubygems/

[blackwinter]

That did it. Thanks!