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#
# Author:: Tim Hinderliter (<tim@opscode.com>)
# Copyright:: Copyright (c) 2011 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'dep_selector'
class Chef
module CookbookVersionSelector
# 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.
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
# all_cookbooks - a hash mapping cookbook names to an array of
# available CookbookVersions.
#
# Creates a DependencyGraph from CookbookVersion objects
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(DepSelector::Version.new(cb_version.version))
cb_version_deps.each_pair do |dep_name, constraint_str|
constraint = DepSelector::VersionConstraint.new(constraint_str)
pv.dependencies << DepSelector::Dependency.new(dep_graph.package(dep_name), constraint)
end
end
end
dep_graph
end
# 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").
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::NoSolutionExists
puts <<EOM
NoSolutionExists:
message = #{$!.message}
unsatisfiable_solution_constraint = #{$!.unsatisfiable_solution_constraint.inspect}
disabled_non_existent_packages = #{$!.disabled_non_existent_packages}
disabled_most_constrained_packages = #{$!.disabled_most_constrained_packages}
EOM
raise Chef::Exceptions::CookbookVersionConflict, filter_dep_selector_message($!.message)
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
# Expands the run_list, constrained to the environment's CookbookVersion
# constraints.
#
# Returns:
# Hash of: name to CookbookVersion
def self.expand_to_cookbook_versions(run_list, environment)
# expand any roles in this run_list.
expanded_run_list = run_list.expand(environment, 'couchdb').recipes.with_version_constraints
cookbooks_for_environment = Chef::Environment.cdb_load_filtered_cookbook_versions(environment)
constrain(cookbooks_for_environment, expanded_run_list)
end
end
end
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