berks-api fails due to json gem version conflict

[zts]

On Ubuntu 14.04, installed "chefdk_0.3.5-1_amd64.deb".
This package includes the berkshelf-api gem (version 1.4.0), which fails like so:

kitchen@6637c2938ed7:~$ eval "$(chef shell-init bash)"
kitchen@6637c2938ed7:~$ which berks-api
/opt/chefdk/embedded/bin/berks-api
kitchen@6637c2938ed7:~$ berks-api -v
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/specification.rb:2087:in `check_version_conflict': can't activate json-1.7.7, already activated json-1.8.1 (Gem::LoadError)
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/specification.rb:1278:in `activate'
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:90:in `block in require'
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:89:in `each'
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:89:in `require'
    from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-4.1.0/lib/ridley.rb:7:in `<top (required)>'
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/berkshelf-api-1.4.0/lib/berkshelf/api.rb:4:in `<top (required)>'
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/berkshelf-api-1.4.0/lib/berkshelf/api/srv_ctl.rb:66:in `start'
    from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/berkshelf-api-1.4.0/lib/berkshelf/api/srv_ctl.rb:52:in `run'
    from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/berkshelf-api-1.4.0/bin/berks-api:5:in `<top (required)>'
    from /opt/chefdk/embedded/bin/berks-api:23:in `load'
    from /opt/chefdk/embedded/bin/berks-api:23:in `<main>'

Updating to the latest version appears to work:

kitchen@6637c2938ed7:~$ chef gem update berkshelf-api
Updating installed gems
Updating berkshelf-api
Fetching: berkshelf-api-2.1.0.gem (100%)
Successfully installed berkshelf-api-2.1.0
Parsing documentation for berkshelf-api-2.1.0
Installing ri documentation for berkshelf-api-2.1.0
Installing darkfish documentation for berkshelf-api-2.1.0
Done installing documentation for berkshelf-api after 0 seconds
Parsing documentation for berkshelf-api-2.1.0
Done installing documentation for berkshelf-api after 0 seconds
Gems updated: berkshelf-api
kitchen@6637c2938ed7:~$ berks-api -v
2.1.0

[zts]

Actually, updating the gem allows berks-api -v to return, but actually starting the server continues to fail with the same error.

[danielsdeleo]

berks-api is just installed for testing, it's not a core component that we appbundle, so you probably have to run it with bundler if you need it.