Berksfileで拾ってきたCookbookがコケた時の対処（attributesが読み込まれない編）

事象

Berksfileで拾ってきたレシピを使いたいが、include_recipeの最中にChefがコケる。

cookbook 'java',
  :git => 'git://github.com/opscode-cookbooks/java.git', :branch => 'master'

% berks install --path vendor/cookbooks

site-cookbooks/hoge/recipe/default.rb

...
include_recipe 'java'
...

% knife solo cook hoge
...
================================================================================
Recipe Compile Error in /tmp/vagrant-chef-1/chef-solo-1/cookbooks/hoge/recipes/default.rb
================================================================================


NoMethodError
-------------
undefined method `[]' for nil:NilClass


Cookbook Trace:
---------------
  /tmp/vagrant-chef-1/chef-solo-2/cookbooks/java/recipes/oracle.rb:31:in `from_file'
  /tmp/vagrant-chef-1/chef-solo-2/cookbooks/java/recipes/default.rb:21:in `from_file'
  /tmp/vagrant-chef-1/chef-solo-1/cookbooks/cdh-node/recipes/default.rb:10:in `from_file'


Relevant File Content:
----------------------
/tmp/vagrant-chef-1/chef-solo-2/cookbooks/java/recipes/oracle.rb:

 24:  #convert version number to a string if it isn't already
 25:  if jdk_version.instance_of? Fixnum
 26:    jdk_version = jdk_version.to_s
 27:  end
 28:
 29:  case jdk_version
 30:  when "6"
 31>>   tarball_url = node['java']['jdk']['6'][arch]['url']
 32:    tarball_checksum = node['java']['jdk']['6'][arch]['checksum']
 33:    bin_cmds = node['java']['jdk']['6']['bin_cmds']
 34:  when "7"
 35:    tarball_url = node['java']['jdk']['7'][arch]['url']
 36:    tarball_checksum = node['java']['jdk']['7'][arch]['checksum']
 37:    bin_cmds = node['java']['jdk']['7']['bin_cmds']
 38:  end
 39:
 40:  if tarball_url =~ /example.com/

原因

拾ってきたレシピのattributes/default.rbが読み込まれていない。

vendor/cookbooks/java/attributes.default.rb

…
# default jdk attributes
default['java']['install_flavor'] = "openjdk"
default['java']['jdk_version'] = '6'
default['java']['arch'] = kernel['machine'] =~ /x86_64/ ? "x86_64" : "i586" # <= ここの設定読み込みが必要
default['java']['openjdk_packages'] = []
...

解決策

拾ってきたレシピのattributesが読み込まれるようにする。
metadata.rbにdependsで利用するcookbookを指定することでattributesの値が読み込まれるようになる。

site-cookbooks/hoge/metadata.rb

...
depends          'java'
...

% knife solo cook hoge
…
[2014-01-17T14:45:07+09:00] INFO: Chef Run complete in 38.748854677 seconds
[2014-01-17T14:45:07+09:00] INFO: Running report handlers
[2014-01-17T14:45:07+09:00] INFO: Report handlers complete
[2014-01-17T14:44:28+09:00] INFO: Forking chef instance to converge...
[2014-01-17T14:44:28+09:00] DEBUG: Fork successful. Waiting for new chef pid: 14321
[2014-01-17T14:45:07+09:00] DEBUG: Forked instance successfully reaped (pid: 14321)
[2014-01-17T14:45:07+09:00] DEBUG: Exiting

余談

• metadata.rbの中でdependsしなくてもレシピの使用は可能で、呼出す側のattributesに値を定義しておけばそれが適用される。
• attributesの中だとkernel変数が存在しているがrecipe側で使おうとすると使えなかった。