/usr/lib/ruby/vendor_ruby/chef_zero/endpoints/environment_cookbook_versions_endpoint.rb is in chef-zero 2.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | require 'json'
require 'chef_zero/rest_base'
require 'chef_zero/rest_error_response'
module ChefZero
module Endpoints
# /environments/NAME/cookbook_versions
class EnvironmentCookbookVersionsEndpoint < RestBase
def post(request)
cookbook_names = list_data(request, ['cookbooks'])
# Get the list of cookbooks and versions desired by the runlist
desired_versions = {}
run_list = JSON.parse(request.body, :create_additions => false)['run_list']
run_list.each do |run_list_entry|
if run_list_entry =~ /(.+)::.+\@(.+)/ || run_list_entry =~ /(.+)\@(.+)/
raise RestErrorResponse.new(412, "No such cookbook: #{$1}") if !cookbook_names.include?($1)
raise RestErrorResponse.new(412, "No such cookbook version for cookbook #{$1}: #{$2}") if !list_data(request, ['cookbooks', $1]).include?($2)
desired_versions[$1] = [ $2 ]
else
desired_cookbook = run_list_entry.split('::')[0]
raise RestErrorResponse.new(412, "No such cookbook: #{desired_cookbook}") if !cookbook_names.include?(desired_cookbook)
desired_versions[desired_cookbook] = list_data(request, ['cookbooks', desired_cookbook])
end
end
# Filter by environment constraints
environment = JSON.parse(get_data(request, request.rest_path[0..1]), :create_additions => false)
environment_constraints = environment['cookbook_versions'] || {}
desired_versions.each_key do |name|
desired_versions = filter_by_constraint(desired_versions, name, environment_constraints[name])
end
# Depsolve!
solved = depsolve(request, desired_versions.keys, desired_versions, environment_constraints)
if !solved
if @last_missing_dep && !cookbook_names.include?(@last_missing_dep)
return raise RestErrorResponse.new(412, "No such cookbook: #{@last_missing_dep}")
elsif @last_constraint_failure
return raise RestErrorResponse.new(412, "Could not satisfy version constraints for: #{@last_constraint_failure}")
else
return raise RestErrorResponse.new(412, "Unsolvable versions!")
end
end
result = {}
solved.each_pair do |name, versions|
cookbook = JSON.parse(get_data(request, ['cookbooks', name, versions[0]]), :create_additions => false)
result[name] = DataNormalizer.normalize_cookbook(cookbook, name, versions[0], request.base_uri, 'MIN')
end
json_response(200, result)
end
def depsolve(request, unsolved, desired_versions, environment_constraints)
desired_versions.each do |cb, ver|
if ver.empty?
@last_constraint_failure = cb
return nil
end
end
# If everything is already
solve_for = unsolved[0]
return desired_versions if !solve_for
# Go through each desired version of this cookbook, starting with the latest,
# until we find one we can solve successfully with
sort_versions(desired_versions[solve_for]).each do |desired_version|
new_desired_versions = desired_versions.clone
new_desired_versions[solve_for] = [ desired_version ]
new_unsolved = unsolved[1..-1]
# Pick this cookbook, and add dependencies
cookbook_obj = JSON.parse(get_data(request, ['cookbooks', solve_for, desired_version]), :create_additions => false)
cookbook_metadata = cookbook_obj['metadata'] || {}
cookbook_dependencies = cookbook_metadata['dependencies'] || {}
dep_not_found = false
cookbook_dependencies.each_pair do |dep_name, dep_constraint|
# If the dep is not already in the list, add it to the list to solve
# and bring in all environment-allowed cookbook versions to desired_versions
if !new_desired_versions.has_key?(dep_name)
new_unsolved = new_unsolved + [dep_name]
# If the dep is missing, we will try other versions of the cookbook that might not have the bad dep.
if !exists_data_dir?(request, ['cookbooks', dep_name])
@last_missing_dep = dep_name.to_s
dep_not_found = true
break
end
new_desired_versions[dep_name] = list_data(request, ['cookbooks', dep_name])
new_desired_versions = filter_by_constraint(new_desired_versions, dep_name, environment_constraints[dep_name])
end
new_desired_versions = filter_by_constraint(new_desired_versions, dep_name, dep_constraint)
end
next if dep_not_found
# Depsolve children with this desired version! First solution wins.
result = depsolve(request, new_unsolved, new_desired_versions, environment_constraints)
return result if result
end
return nil
end
def sort_versions(versions)
result = versions.sort_by { |version| Gem::Version.new(version.dup) }
result.reverse
end
def filter_by_constraint(versions, cookbook_name, constraint)
return versions if !constraint
constraint = Gem::Requirement.new(constraint)
new_versions = versions[cookbook_name]
new_versions = new_versions.select { |version| constraint.satisfied_by?(Gem::Version.new(version.dup)) }
result = versions.clone
result[cookbook_name] = new_versions
result
end
end
end
end
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