[chef] Re: How to do conditional checks for gem installation?

[Bryan McLellan < >]

On Thu, Mar 8, 2012 at 4:46 AM, Sachin Sagar Rai 
<
 >
 wrote:
> Following installs the ruby gems on each chef-client run.
>
> gems = %w(aws-sdk gist)
> gems.each do |name|
>   r = gem_package name do
>     version node["dev_tools"]["#{name}_version"]
>     action :nothing
>   end
>
>   r.run_action(:install)
> end
>
> How to apply the `not_if` conditional checking for the
> `r.run_action(:install)` action?

As I mentioned in the other email thread, this pattern is a bit of a
kludge to install the gem immediately so they can be used in a Chef
recipe, and the pattern is replaced with chef_gem in the next version
of Chef. If you don't need to use the gem in the Chef recipe, use the
standard pattern:

gems = %w(aws-sdk gist)
gems.each do |name|
  gem_package name do
    version node["dev_tools"]["#{name}_version"]
    not_if "true"
  end
end

If you do need them immediately you could use the existing kludge
pattern but wrap the call to run_action in a conditional:

  if !system('false')
    r.run_action(:install)
  end

Bryan