[chef] Re: howto install a ruby gem that's a pre-req of a chef recipe

[Joshua Blatt < >]

After playing with this a bit, I found that chef loads libraries before the 
recipe is compiled so sometimes you can't use that gem_package resource in 
time.

I also noticed that the opscode database cookbook has this problem too.     
The 'added:' lines below addressed the problem for me, but is this a colossal 
hack?   Would love to know if I'm doing something stupid here or depending on 
internals that may change in the future….

class Chef
  class Provider
    class Database
      class MysqlUser < Chef::Provider::Database::Mysql
        include Chef::Mixin::ShellOut

        def load_current_resource
  added:       gem_package = Chef::Resource::GemPackage.new('mysql')
  added:       gem_package.action(:nothing)
  added:       gem_package.run_action(:install)
          Gem.clear_paths
          require 'mysql'
          @current_resource = 
Chef::Resource::DatabaseUser.new(@new_resource.name)
          @current_resource.username(@new_resource.name)
          @current_resource
        end

Before I added those lines I saw this:

LoadError: no such file to load -- mysql
/opt/chef/embedded/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:55:in 
`require'
/opt/chef/embedded/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:55:in 
`require'
/tmp/exec/cookbooks/database/libraries/provider_database_mysql_user.rb:29:in 
`load_current_resource'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource.rb:453:in
 `run_action'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/runner.rb:49:in
 `run_action'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/runner.rb:85:in
 `block (2 levels) in converge'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/runner.rb:85:in
 `each'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/runner.rb:85:in
 `block in converge'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource_collection.rb:94:in
 `block in execute_each_resource'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource_collection/stepable_iterator.rb:116:in
 `call'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource_collection/stepable_iterator.rb:116:in
 `call_iterator_block'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource_collection/stepable_iterator.rb:85:in
 `step'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource_collection/stepable_iterator.rb:104:in
 `iterate'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource_collection/stepable_iterator.rb:55:in
 `each_with_index'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/resource_collection.rb:92:in
 `execute_each_resource'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/runner.rb:80:in
 `converge'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/client.rb:330:in
 `converge'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/client.rb:163:in
 `run'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/application/solo.rb:207:in
 `block in run_application'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/application/solo.rb:195:in
 `loop'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/application/solo.rb:195:in
 `run_application'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/lib/chef/application.rb:70:in
 `run'
/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-10.12.0/bin/chef-solo:25:in 
`<top (required)>'

Thanks,

Josh


On Aug 14, 2012, at 8:15 PM, AJ Christensen wrote:

> I believe the s3_file cookbook on the community site is now written in
> pure ruby (uses OpenSSL to generate the headers), so this is no longer
> necessary.
> 
> Regardless, the solution is to use the 'chef_gem' resource during
> 0.10.x (or the chef_gem cookbook for <= 0.10.10*)
> 
> chef_gem "aws-s3"
> 
> Also, you can manipulate and fire the resource created by the DSL (the
> 'old way') during compile time:
> 
> r = gem_package("aws-s3") { action :nothing }
> r.run_action(:install)
> 
> Cheers,
> 
> --AJ
> 
> On 15 August 2012 14:55, Joshua Blatt 
> <
 >
>  wrote:
>> Hi guys,
>> 
>> Wondering if you can help me with a little ordering issue.
>> 
>> I want to create a library with an s3_file resource and provider:  
>> https://gist.github.com/470321
>> 
>> That code depends on the aws-s3 ruby gem http://amazon.rubyforge.org
>> 
>> My reading of http://wiki.opscode.com/display/chef/Anatomy+of+a+Chef+Run ;
>> makes me think the gem won't be installed until the execution phase but 
>> it'll be ruby required in the compilation phase.
>> 
>> Is there a way to install a ruby gem earlier in the process?   Seems like 
>> the sort of thing that'd be really useful every once in a while.
>> 
>> Thanks,
>> 
>> Josh