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#
# Author:: Adam Edwards (<adamed@chef.io>)
#
# Copyright:: Copyright (c) Chef Software Inc.
#
# 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_relative "../../mixin/powershell_exec"
class Chef::Util::DSC
class ConfigurationGenerator
include Chef::Mixin::PowershellExec
def initialize(node, config_directory)
@node = node
@config_directory = config_directory
end
def configuration_document_from_script_code(code, configuration_flags, imports)
Chef::Log.trace("DSC: DSC code:\n '#{code}'")
generated_script_path = write_document_generation_script(code, "chef_dsc", imports)
begin
configuration_document_from_script_path(generated_script_path, "chef_dsc", configuration_flags)
ensure
::FileUtils.rm(generated_script_path)
end
end
def configuration_document_from_script_path(script_path, configuration_name, configuration_flags)
validate_configuration_name!(configuration_name)
config_generation_code = configuration_document_generation_code(script_path, configuration_name)
switches_string = command_switches_string(get_merged_configuration_flags!(configuration_flags, configuration_name))
powershell_exec!("#{config_generation_code} #{switches_string}")
configuration_document_location = find_configuration_document(configuration_name)
unless configuration_document_location
raise "No DSC configuration for '#{configuration_name}' was generated from supplied DSC script"
end
configuration_document = get_configuration_document(configuration_document_location)
::FileUtils.rm_rf(configuration_document_location)
configuration_document
end
protected
def validate_switch_name!(switch_parameter_name)
unless switch_parameter_name.match?(/\A[A-Za-z]+[_a-zA-Z0-9]*\Z/)
raise ArgumentError, "`#{switch_parameter_name}` is not a valid PowerShell cmdlet switch parameter name"
end
end
def escape_parameter_value(parameter_value)
parameter_value.gsub(/(`|'|"|#)/, '`\1')
end
def escape_string_parameter_value(parameter_value)
"'#{escape_parameter_value(parameter_value)}'"
end
def command_switches_string(switches)
command_switches = switches.map do |switch_name, switch_value|
if switch_name.class != Symbol
raise ArgumentError, "Invalid type `#{switch_name} `for PowerShell switch '#{switch_name}'. The switch must be specified as a Symbol'"
end
validate_switch_name!(switch_name)
switch_argument = ""
switch_present = true
case switch_value
when Numeric, Float
switch_argument = switch_value.to_s
when FalseClass
switch_present = false
when TrueClass
when String
switch_argument = escape_string_parameter_value(switch_value)
else
raise ArgumentError, "Invalid argument type `#{switch_value.class}` specified for PowerShell switch `:#{switch_name}`. Arguments to PowerShell must be of type `String`, `Numeric`, `Float`, `FalseClass`, or `TrueClass`"
end
switch_present ? ["-#{switch_name.to_s.downcase}", switch_argument].join(" ").strip : ""
end
command_switches.join(" ")
end
# From PowerShell error help for the Configuration language element:
# Standard names may only contain letters (a-z, A-Z), numbers (0-9), and underscore (_).
# The name may not be null or empty, and should start with a letter.
def validate_configuration_name!(configuration_name)
if !!(configuration_name =~ /\A[A-Za-z]+[_a-zA-Z0-9]*\Z/) == false
raise ArgumentError, "Configuration `#{configuration_name}` is not a valid PowerShell cmdlet name"
end
end
def get_merged_configuration_flags!(configuration_flags, configuration_name)
merged_configuration_flags = { outputpath: configuration_document_directory(configuration_name) }
if configuration_flags
configuration_flags.map do |switch, value|
if merged_configuration_flags.key?(switch.to_s.downcase.to_sym)
raise ArgumentError, "The `flags` attribute for the dsc_script resource contained a command line switch :#{switch} that is disallowed."
end
merged_configuration_flags[switch.to_s.downcase.to_sym] = value
end
end
merged_configuration_flags
end
def configuration_code(code, configuration_name, imports)
<<~EOF
$ProgressPreference = 'SilentlyContinue';
Configuration '#{configuration_name}'
{
#{generate_import_resource_statements(imports).join(" \n")}
node 'localhost'
{
#{code}
}
}
EOF
end
def generate_import_resource_statements(imports)
if imports
imports.map do |resource_module, resources|
if resources.length == 0 || resources.include?("*")
"Import-DscResource -ModuleName #{resource_module}"
else
"Import-DscResource -ModuleName #{resource_module} -Name #{resources.join(",")}"
end
end
else
[]
end
end
def configuration_document_generation_code(configuration_script, configuration_name)
". '#{configuration_script}';#{configuration_name}"
end
def write_document_generation_script(code, configuration_name, imports)
script_path = "#{@config_directory}/chef_dsc_config.ps1"
::File.open(script_path, "wt") do |script|
script.write(configuration_code(code, configuration_name, imports))
end
script_path
end
def find_configuration_document(configuration_name)
document_directory = configuration_document_directory(configuration_name)
document_file_name = ::Dir.entries(document_directory).find { |path| path =~ /.*.mof/ }
::File.join(document_directory, document_file_name) if document_file_name
end
def configuration_document_directory(configuration_name)
::File.join(@config_directory, configuration_name)
end
def get_configuration_document(document_path)
::File.open(document_path, "rb", &:read)
end
end
end
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