[chef] RE: Re: Trying to create links to installed package

["THARP, JOSHUA L" < >]

Thank you for the help.

 

Is there a philosophical reason why specifying the version number is the better answer? Tying your recipe to a specific version of a package requires more maintenance. If Chef provided a way to detect the version number of the package it just installed, the recipe could be more generic.

 

From: Daniel DeLeo [mailto: On Behalf Of Daniel DeLeo
Sent: Monday, October 21, 2013 10:49 AM
To:
Subject: [chef] Re: Trying to create links to installed package

 

 

On Monday, October 21, 2013 at 6:43 AM, THARP, JOSHUA L wrote:

I’m writing a cookbook for a locally-built package served by a local yum server. The installation is straight-forward enough.

 

package “my-package”

 

Now I am creating a second recipe that creates links to the installed package. However, the package installation directory contains the version number of the package. Is there a way to capture either the directory created by the package command or the version of the package installed?

 

My target platform is a Fedora-based Linux so I can use yum_package if that helps solve this issue.

 

My attempts to solve this:

ver = `yum list my-package | grep “my-package” | cut –c 41-55`.strip

ver = `yum info my-package | grep “my-package” | cut –f 3 –d ‘-‘

both return nothing on the first chef-client run (broken links) and return the correct value on the second chef-client run (fixed links). Also neither will work if more than one version of my-package is on the box.

 

Suggestions?

 

Thanks,

 

Josh

A few ways to do this:

 

The best way is if you know the version number up front:

 

package "thing" do

  version node[:my_package][:version]

end

 

link "/bin/thing" do

  to "/opt/my_package/#{node[:my_package][:version]}/bin/thing"

end

 

If that's completely unpossible for you, then you need to use a little bit of magic to get the link path during the converge phase, e.g.

 

link "/bin/thing" do

 

  # create a lazy resource attribute that will find the path:

  path_finder = lazy do

    version = ver = `yum list my-package | grep “my-package” | cut –c 41-55`.strip

    "/opt/my_package/#{version}/bin/thing"

  end

 

  # set the `to` attribute of the link resource to the lazy-evaluated attribute

  to path_finder

end

 

-- 

Daniel DeLeo