### Home Classes Methods

### In Files

- lib/chef/cookbook_version_selector.rb

### Methods

- ::constrain
- ::create_dependency_graph_from_cookbooks
- ::expand_to_cookbook_versions
- ::filter_dep_selector_message

### Files

- LICENSE
- README.rdoc

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# Chef::CookbookVersionSelector

### Public Class Methods

constrain(all_cookbooks, recipe_constraints) click to toggle source

Return a hash mapping cookbook names to a CookbookVersion object. If there is no solution that satisfies the constraints, the first run list item that caused unsatisfiability is returned.

This is the final version-resolved list of cookbooks for the RunList.

all_cookbooks - a hash mapping cookbook names to an array of available CookbookVersions.

recipe_constraints - an array of hashes describing the expanded run list. Each element is a hash containing keys :name and :version_constraint. The :name component is either the fully-qualified recipe name (e.g. "cookbook1::non_default_recipe") or just a cookbook name, indicating the default recipe is to be run (e.g. "cookbook1").

    # File lib/chef/cookbook_version_selector.rb, line 84
    def self.constrain(all_cookbooks, recipe_constraints)
      dep_graph = create_dependency_graph_from_cookbooks(all_cookbooks)

      # extract cookbook names from (possibly) fully-qualified recipe names
      cookbook_constraints = recipe_constraints.map do |recipe_spec|
        cookbook_name = (recipe_spec[:name][/^(.+)::/, 1] || recipe_spec[:name])
        DepSelector::SolutionConstraint.new(dep_graph.package(cookbook_name),
                                            recipe_spec[:version_constraint])
      end

      # Pass in the list of all available cookbooks (packages) so that
      # DepSelector can distinguish between "no version available for
      # cookbook X" and "no such cookbook X" when an environment
      # filters out all versions for a given cookbook.
      all_packages = all_cookbooks.inject([]) do |acc, (cookbook_name, cookbook_versions)|
        acc << dep_graph.package(cookbook_name)
        acc
      end

      # find a valid assignment of CoookbookVersions. If no valid
      # assignment exists, indicate which run_list_item causes the
      # unsatisfiability and try to hint at what might be wrong.
      soln =
        begin
          DepSelector::Selector.new(dep_graph).find_solution(cookbook_constraints, all_packages)
        rescue DepSelector::Exceptions::InvalidSolutionConstraints => e
          non_existent_cookbooks = e.non_existent_packages.map {|constraint| constraint.package.name}
          cookbooks_with_no_matching_versions = e.constrained_to_no_versions.map {|constraint| constraint.package.name}

          # Spend a whole lot of effort for pluralizing and
          # prettifying the message.
          message = ""
          if non_existent_cookbooks.length > 0
            message += "no such " + (non_existent_cookbooks.length > 1 ? "cookbooks" : "cookbook")
            message += " #{non_existent_cookbooks.join(", ")}"
          end

          if cookbooks_with_no_matching_versions.length > 0
            if message.length > 0
              message += "; "
            end

            message += "no versions match the constraints on " + (cookbooks_with_no_matching_versions.length > 1 ? "cookbooks" : "cookbook")
            message += " #{cookbooks_with_no_matching_versions.join(", ")}"
          end

          message = "Run list contains invalid items: #{message}."

          raise Chef::Exceptions::CookbookVersionSelection::InvalidRunListItems.new(message, non_existent_cookbooks, cookbooks_with_no_matching_versions)
        rescue DepSelector::Exceptions::NoSolutionExists => e
          raise Chef::Exceptions::CookbookVersionSelection::UnsatisfiableRunListItem.new(filter_dep_selector_message(e.message), e.unsatisfiable_solution_constraint, e.disabled_non_existent_packages, e.disabled_most_constrained_packages)
        end

      # map assignment back to CookbookVersion objects
      selected_cookbooks = {}
      soln.each_pair do |cb_name, cb_version|
        # TODO [cw, 2011/2/10]: related to the TODO in
        # create_dependency_graph_from_cookbooks, cbv.version
        # currently returns a String, so we must compare to
        # cb_version.to_s, since it's a for-real Version object.
        selected_cookbooks[cb_name] = all_cookbooks[cb_name].find{|cbv| cbv.version == cb_version.to_s}
      end
      selected_cookbooks
    end

create_dependency_graph_from_cookbooks(all_cookbooks) click to toggle source

all_cookbooks - a hash mapping cookbook names to an array of available CookbookVersions.

Creates a DependencyGraph from CookbookVersion objects

    # File lib/chef/cookbook_version_selector.rb, line 41
    def self.create_dependency_graph_from_cookbooks(all_cookbooks)
      dep_graph = DepSelector::DependencyGraph.new

      all_cookbooks.each do |cb_name, cb_versions|
        cb_versions.each do |cb_version|
          cb_version_deps = cb_version.metadata.dependencies
          # TODO [cw. 2011/2/10]: CookbookVersion#version returns a
          # String even though we're storing as a DepSelector::Version
          # object underneath. This should be changed so that we
          # return the object and handle proper serialization and
          # de-serialization. For now, I'm just going to create a
          # Version object from the String representation.
          pv = dep_graph.package(cb_name).add_version(Chef::Version.new(cb_version.version))
          cb_version_deps.each_pair do |dep_name, constraint_str|
            # if the dependency is specified as cookbook::recipe,
            # extract the cookbook component
            dep_cb_name = dep_name.split("::").first
            constraint = Chef::VersionConstraint.new(constraint_str)
            pv.dependencies << DepSelector::Dependency.new(dep_graph.package(dep_cb_name), constraint)
          end
        end
      end

      dep_graph
    end

expand_to_cookbook_versions(run_list, environment, couchdb=nil) click to toggle source

Expands the run_list, constrained to the environment's CookbookVersion constraints.

Returns:

    Hash of: name to CookbookVersion

    # File lib/chef/cookbook_version_selector.rb, line 155
    def self.expand_to_cookbook_versions(run_list, environment, couchdb=nil)
      # expand any roles in this run_list.
      expanded_run_list = run_list.expand(environment, 'couchdb', :couchdb => couchdb).recipes.with_version_constraints

      cookbooks_for_environment = Chef::Environment.cdb_minimal_filtered_versions(environment, couchdb)
      cookbook_collection = constrain(cookbooks_for_environment, expanded_run_list)
      full_cookbooks = Chef::MinimalCookbookVersion.load_full_versions_of(cookbook_collection.values, couchdb)
      full_cookbooks.inject({}) do |cb_map, cookbook_version|
        cb_map[cookbook_version.name] = cookbook_version
        cb_map
      end
    end

filter_dep_selector_message(message) click to toggle source

This method replaces verbiage from DepSelector messages with Chef-domain-specific verbiage, such as replacing package with cookbook.

TODO [cw, 2011/2/25]: this is a near-term hack. In the long run, we'll do this better.

    # File lib/chef/cookbook_version_selector.rb, line 28
    def self.filter_dep_selector_message(message)
      m = message
      m.gsub!("Package", "Cookbook")
      m.gsub!("package", "cookbook")
      m.gsub!("Solution constraint", "Run list item")
      m.gsub!("solution constraint", "run list item")
      m
    end

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