I went with option 1 of the below and we now have the RC candidate of chef 
loaded and presumably in use. However we have a strange problem that 
vagrant says the plugin is installed yet then fails to load it during 
vagrant up. The relevant section is here:

ERROR root: Failed to load plugin: vagrant-librarian-chef
ERROR root: -- Error: #
ERROR root: -- Backtrace:
ERROR root: 
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:2007:in 
raise_if_conflicts'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1176:inactivate'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1212:in 
block in activate_dependencies'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1198:ineach'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1198:in 
activate_dependencies'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1180:inactivate'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1212:in 
block in activate_dependencies'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1198:ineach'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1198:in 
activate_dependencies'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1180:inactivate'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems.rb:186:in rescue in 
try_activate'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems.rb:183:intry_activate'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:117:in
 
rescue in require'
c:/HashiCorp/Vagrant/embedded/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:124:inrequire'
c:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.4.3/lib/vagrant.rb:204:in 
require_plugin'
c:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.4.3/lib/vagrant/environment.rb:760:inblock
 
in load_plugins'
c:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.4.3/lib/vagrant/environment.rb:751:in
 
each'
c:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.4.3/lib/vagrant/environment.rb:751:inload_plugins'
c:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.4.3/lib/vagrant/environment.rb:132:in
 
initialize'
c:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.4.3/bin/vagrant:105:innew'
c:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.4.3/bin/vagrant:105:in 
<top (required)>'
c:/HashiCorp/Vagrant/bin/../embedded/gems/bin/vagrant:23:inload'
c:/HashiCorp/Vagrant/bin/../embedded/gems/bin/vagrant:23:in `'
INFO interface: error: Failed to load the "vagrant-librarian-chef" plugin. 
View logs for more details.

On Monday, February 3, 2014 1:05:51 PM UTC+1, Rhys Gareth wrote:
>
> Mitchell, thank you!  Sorry, I'm not familiar with ruby/gems, so this has 
> required some learning. I hope I can solve it in the next step/answer from 
> you:
>
> vagrant-librarian-chef depends up librarian-chef, which depends on chef, 
> which has the ffi dependency problem. This has just been fixed in a release 
> candidate version of Chef, now referenced on rubygems.org (
> http://rubygems.org/gems/chef)
>
> What is the best/cleanest way to uninstall/reinstall to get this fix? I am 
> guessing there are two alternatives:
> 1. Manually install the RC gem version of chef first, then run "vagrant 
> plugin install vagrant-librarian-chef" and librarian-chef should use 
> whatever chef version I have cached, i.e. the latest RC one.
> 2. Manually edit the .gemspec of librarian.chef to add dependency for the 
> RC version of Chef, and let it automatically download that locally
>
> Thanks again,
> Rhys
>
> On Monday, February 3, 2014 11:54:24 AM UTC+1, Mitchell Hashimoto wrote:
>>
>> Rhys,
>>
>> Since this is a bug with the gemspec of the plugin, you'd have to 
>> actually go into the "~.vagrant.d/gems/gems" folder, find the gem that 
>> depends on the wrong FFI version, and change it in that gemspec itself.
>>
>> Best,
>> Mitchell
>>
>>
>> On Mon, Feb 3, 2014 at 11:52 AM, Rhys Gareth <[email protected]> wrote:
>>
>>> We have a Vagrant-based project which is working fine on OS X and Linux 
>>> but failing on Windows. The culprit is the vagrant-librarian-chef plugin. 
>>> It installs without error, but causes "vagrant up" to fail:
>>>
>>>  INFO environment: Loading plugin from JSON: vagrant-librarian-chef
>>> ERROR root: Failed to load plugin: vagrant-librarian-chef
>>> ERROR root:  -- Error: #<Gem::LoadError: Unable to activate 
>>> chef-11.8.2-x86-ming
>>> w32, because ffi-1.9.3-x86-mingw32 conflicts with ffi (= 1.3.1)>
>>>
>>> The root cause appears to have been fixed here: 
>>> https://tickets.opscode.com/browse/CHEF-4913 but this has not flowed 
>>> through to the Vagrant plugin.
>>>
>>> I'd try to patch this locally myself but I'm confused by how the vagrant 
>>> plugin namespace works and how I would do this? e.g. could I fork the 
>>> plugin, update it, build it and copy it to a local path for vagrant plugin 
>>> install to use, rather than it pulling the old/unworking version from the 
>>> web?
>>>
>>> Rhys
>>>
>>> -- 
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>>
>>

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