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#
# Author:: Claire McQuin (<claire@opscode.com>)
# Copyright:: Copyright (c) 2013 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 expressed or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License
#
require 'ohai/dsl'
module Ohai
class Runner
# safe_run: set to true if this runner will run plugins in
# safe-mode. default false.
def initialize(controller, safe_run = false)
@provides_map = controller.provides_map
@safe_run = safe_run
end
# runs this plugin and any un-run dependencies. if force is set to
# true, then this plugin and its dependencies will be run even if
# they have been run before.
def run_plugin(plugin, force = false)
unless plugin.kind_of?(Ohai::DSL::Plugin)
raise ArgumentError, "Invalid plugin #{plugin} (must be an Ohai::DSL::Plugin or subclass)"
end
visited = [plugin]
while !visited.empty?
next_plugin = visited.pop
next if next_plugin.has_run? unless force
if visited.include?(next_plugin)
raise Ohai::Exceptions::DependencyCycle, "Dependency cycle detected. Please refer to the following plugins: #{get_cycle(visited, p).join(", ") }"
end
dependency_providers = fetch_plugins(next_plugin.dependencies)
dependency_providers.delete_if { |dep_plugin| (!force && dep_plugin.has_run?) || dep_plugin.eql?(next_plugin) }
if dependency_providers.empty?
@safe_run ? next_plugin.safe_run : next_plugin.run
else
visited << next_plugin << dependency_providers.first
end
end
end
# returns a list of plugins which provide the given attributes
def fetch_plugins(attributes)
@provides_map.find_providers_for(attributes)
end
# given a list of plugins and the first plugin in the cycle,
# returns the list of plugin source files responsible for the
# cycle. does not include plugins that aren't a part of the cycle
def get_cycle(plugins, cycle_start)
cycle = plugins.drop_while { |plugin| !plugin.eql?(cycle_start) }
names = []
cycle.each { |plugin| names << plugin.name }
names
end
end
end
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