[chef] Re: Re: Cookbook dependencies doc

[Silviu Dicu < >]

Hi,

I was looking for a document that explains what is the merging order of the dependencies and who will win in the end 

Take a situation like this

Node run config

{

  "name": "test-constraints",

  "chef_environment": "test",

  "normal": {

  },

  "run_list": [

    "recipe[a]"

  ]

}

$ grep depends  cookbooks/a/metadata.rb

depends "b"

depends "tech", "= 0.3.0"

$ tail -1 cookbooks/a/recipes/default.rb

include_recipe "b"

$ grep depends cookbooks/b/metadata.rb

depends "tech", "= 0.1.0"

$ tail -1  cookbooks/b/recipes/default.rb

include_recipe "tech"

$ grep tech environments/test.json

    "tech": "= 0.2.0"

This runs w/o problems.

But if I change environment to = 0.1.0 will do this

[2014-02-28T00:07:36+00:00] INFO: HTTP Request Returned 412 Precondition Failed: {"message"=>"Unable to solve constraints, the following solutions were attempted \n\n    Unable to satisfy goal constraint a due to constraint on tech\n        (a = 0.1.0) -> (tech = 0.2.0)\n    Unable to satisfy goal constraint a due to constraints on tech\n        (a = 0.2.0) -> (tech = 0.3.0)\n        (a = 0.2.0) -> (b = 0.1.0) -> (tech = 0.1.0)\n", "unsatisfiable_run_list_item"=>["a"], "non_existent_cookbooks"=>[], "most_constrained_cookbooks"=>["(tech = 0.2.0)"]}

If I change environment to = 0.3.0

[2014-02-28T00:13:08+00:00] INFO: HTTP Request Returned 412 Precondition Failed: {"message"=>"Unable to solve constraints, the following solutions were attempted \n\n    Unable to satisfy goal constraint a due to constraint on tech\n        (a = 0.1.0) -> (tech = 0.2.0)\n    Unable to satisfy goal constraint a due to constraints on tech\n        (a = 0.2.0) -> (tech = 0.3.0)\n        (a = 0.2.0) -> (b = 0.1.0) -> (tech = 0.1.0)\n", "unsatisfiable_run_list_item"=>["a"], "non_existent_cookbooks"=>[], "most_constrained_cookbooks"=>["(tech = 0.2.0)"]}

$ knife cookbook show tech

tech   0.3.0  0.2.0  0.1.0

thanks!

-silviu

Best,

-M

On Thu, Feb 27, 2014 at 1:32 PM, Silviu Dicu < " target="_blank"> > wrote:

Hi,

Could somebody point to a document describing how the cookbook dependencies are calculated ?

I found for attributes http://docs.opscode.com/chef_overview_attributes.html but not sure if apply for cookbook version constraints.


thanks!

- silviu