[chef] Chef-DK-bundled Berkshelf fails: cannot load hashie/hash_extensions

[Phil Mocek < >]

When I attempt to initialize a cookbook using the Berkshelf
installed by Chef DK 0.1.0 on Ubuntu 12.04, it fails as shown
below.  How should I go about troubleshooting?

    $ berks cookbook "$COOKBOOK_NAME" --maintainer="$MY_NAME" \
        --maintainer-email="$MY_EMAIL_ADDRESS" --no-skip-vagrant \
        --no-skip-git --no-skip-test-kitchen --foodcritic \
        --chef-minitest --scmversion --no-no-bundler

/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in
`require': cannot load such file -- hashie/hash_extensions (LoadError)
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in
`rescue in require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:144:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model/attributes.rb:2:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model.rb:6:in
`require_relative'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model.rb:6:in
`<module:VariaModel>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model.rb:4:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley/chef_object.rb:1:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley.rb:63:in
`require_relative'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley.rb:63:in
`<module:Ridley>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley.rb:13:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/home/pmocek/.chefdk/gem/ruby/2.1.0/gems/berkshelf-3.1.2/lib/berkshelf.rb:6:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/home/pmocek/.chefdk/gem/ruby/2.1.0/gems/berkshelf-3.1.2/lib/berkshelf/cli.rb:1:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/home/pmocek/.chefdk/gem/ruby/2.1.0/gems/berkshelf-3.1.2/bin/berks:3:in
`<top (required)>'
        from /opt/chefdk/embedded/bin/berks:23:in `load'
        from /opt/chefdk/embedded/bin/berks:23:in `<main>'
    $ which ruby
    /opt/chefdk/embedded/bin/ruby
    $ ruby --version
    ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-linux]
    $ which berks
    /opt/chefdk/embedded/bin/berks
    $ berks --version

/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in
`require': cannot load such file -- hashie/hash_extensions (LoadError)
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in
`rescue in require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:144:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model/attributes.rb:2:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model.rb:6:in
`require_relative'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model.rb:6:in
`<module:VariaModel>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/varia_model-0.3.2/lib/varia_model.rb:4:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley/chef_object.rb:1:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley.rb:63:in
`require_relative'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley.rb:63:in
`<module:Ridley>'
        from
/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/ridley-3.1.0/lib/ridley.rb:13:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/home/pmocek/.chefdk/gem/ruby/2.1.0/gems/berkshelf-3.1.2/lib/berkshelf.rb:6:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/home/pmocek/.chefdk/gem/ruby/2.1.0/gems/berkshelf-3.1.2/lib/berkshelf/cli.rb:1:in
`<top (required)>'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:73:in
`require'
        from
/home/pmocek/.chefdk/gem/ruby/2.1.0/gems/berkshelf-3.1.2/bin/berks:3:in
`<top (required)>'
        from /opt/chefdk/embedded/bin/berks:23:in `load'
        from /opt/chefdk/embedded/bin/berks:23:in `<main>'
    $ echo $PATH

/opt/chefdk/embedded/bin:/home/pmocek/.chefdk/gem/ruby/2.1.0/bin:/home/pmocek/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

-- 
Phil Mocek
https://mocek.org