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#
# Author:: Stuart Preston (<stuart@chef.io>)
# Copyright:: Copyright (c) Chef Software 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 "ffi" unless defined?(FFI)
require_relative "json_compat"
class Chef
class PowerShell
extend FFI::Library
attr_reader :result
attr_reader :errors
attr_reader :verbose
# Run a command under PowerShell via FFI
# This implementation requires the managed dll and native wrapper to be in the library search
# path on Windows (i.e. c:\windows\system32 or in the same location as ruby.exe).
#
# Requires: .NET Framework 4.0 or higher on the target machine.
#
# @param script [String] script to run
# @return [Object] output
def initialize(script, timeout: nil)
# This Powershell DLL source lives here: https://github.com/chef/chef-powershell-shim
# Every merge into that repo triggers a Habitat build and promotion. Running
# the rake :update_chef_exec_dll task in this (chef/chef) repo will pull down
# the built packages and copy the binaries to distro/ruby_bin_folder. Bundle install
# ensures that the correct architecture binaries are installed into the path.
@dll ||= "Chef.PowerShell.Wrapper.dll"
exec(script, timeout)
end
#
# Was there an error running the command
#
# @return [Boolean]
#
def error?
return true if errors.count > 0
false
end
class CommandFailed < RuntimeError; end
#
# @raise [Chef::PowerShell::CommandFailed] raise if the command failed
#
def error!
raise Chef::PowerShell::CommandFailed, "Unexpected exit in PowerShell command: #{@errors}" if error?
end
private
def exec(script, timeout: nil)
FFI.ffi_lib @dll
FFI.attach_function :execute_powershell, :ExecuteScript, %i{string int}, :pointer
timeout = timeout&.nonzero? ? timeout : -1
execution = FFI.execute_powershell(script, timeout).read_utf16string
hashed_outcome = Chef::JSONCompat.parse(execution)
@result = Chef::JSONCompat.parse(hashed_outcome["result"])
@errors = hashed_outcome["errors"]
@verbose = hashed_outcome["verbose"]
end
end
end
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