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#
# Author:: Daniel DeLeo (<dan@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 'chef/mixin/shell_out'
require 'chef/guard_interpreter'
class Chef
class Resource
class Conditional
include Chef::Mixin::ShellOut
# We only create these via the `not_if` or `only_if` constructors, and
# not the default constructor
class << self
private :new
end
def self.not_if(parent_resource, command=nil, command_opts={}, &block)
new(:not_if, parent_resource, command, command_opts, &block)
end
def self.only_if(parent_resource, command=nil, command_opts={}, &block)
new(:only_if, parent_resource, command, command_opts, &block)
end
attr_reader :positivity
attr_reader :command
attr_reader :command_opts
attr_reader :block
def initialize(positivity, parent_resource, command=nil, command_opts={}, &block)
@positivity = positivity
@command, @command_opts = command, command_opts
@block = block
@block_given = block_given?
@parent_resource = parent_resource
raise ArgumentError, "only_if/not_if requires either a command or a block" unless command || block_given?
end
def configure
case @command
when String,Array
@guard_interpreter = Chef::GuardInterpreter.for_resource(@parent_resource, @command, @command_opts)
@block = nil
when nil
# We should have a block if we get here
# Check to see if the user set the guard_interpreter on the parent resource. Note that
# this error will not be raised when using the default_guard_interpreter
if @parent_resource.guard_interpreter != @parent_resource.default_guard_interpreter
msg = "#{@parent_resource.name} was given a guard_interpreter of #{@parent_resource.guard_interpreter}, "
msg << "but not given a command as a string. guard_interpreter does not support blocks (because they just contain ruby)."
raise ArgumentError, msg
end
@guard_interpreter = nil
@command, @command_opts = nil, nil
else
# command was passed, but it wasn't a String
raise ArgumentError, "Invalid only_if/not_if command, expected a string: #{command.inspect} (#{command.class})"
end
end
# this is run during convergence via Chef::Resource#run_action -> Chef::Resource#should_skip?
def continue?
# configure late in case guard_interpreter is specified on the resource after the conditional
configure
case @positivity
when :only_if
evaluate
when :not_if
!evaluate
else
raise "Cannot evaluate resource conditional of type #{@positivity}"
end
end
def evaluate
@guard_interpreter ? evaluate_command : evaluate_block
end
def evaluate_command
@guard_interpreter.evaluate
rescue Chef::Exceptions::CommandTimeout
Chef::Log.warn "Command '#{@command}' timed out"
false
end
def evaluate_block
@block.call
end
def short_description
@positivity
end
def description
cmd_or_block = @command ? "command `#{@command}`" : "ruby block"
"#{@positivity} #{cmd_or_block}"
end
def to_text
if @command
"#{positivity} \"#{@command}\""
else
"#{@positivity} { #code block }"
end
end
end
end
end
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