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#
# Author:: Bryan McLellan <btm@loftninjas.org>
# 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.
#
autoload :YAML, "yaml"
require_relative "../knife"
class Chef::Knife::YamlConvert < Chef::Knife
banner "knife yaml convert YAML_FILENAME [RUBY_FILENAME]"
def run
if name_args.empty?
ui.fatal!("Please specify the file name of a YAML recipe to convert to Ruby")
elsif name_args.size >= 3
ui.fatal!("knife yaml convert YAML_FILENAME [RUBY_FILENAME]")
end
yaml_file = @name_args[0]
unless ::File.exist?(yaml_file) && ::File.readable?(yaml_file)
ui.fatal("Input YAML file '#{yaml_file}' does not exist or is unreadable")
end
ruby_file = if @name_args[1]
@name_args[1] # use the specified output filename if provided
else
if ::File.extname(yaml_file) == ".yml" || ::File.extname(yaml_file) == ".yaml"
yaml_file.gsub(/\.(yml|yaml)$/, ".rb")
else
yaml_file + ".rb" # fall back to putting .rb on the end of whatever the yaml file was named
end
end
if ::File.exist?(ruby_file)
ui.fatal!("Output Ruby file '#{ruby_file}' already exists")
end
yaml_contents = IO.read(yaml_file)
# YAML can contain multiple documents (--- is the separator), let's not support that.
if ::YAML.load_stream(yaml_contents).length > 1
ui.fatal!("YAML recipe '#{yaml_file}' contains multiple documents, only one is supported")
end
# Unfortunately, per the YAML spec, comments are stripped when we load, so we lose them on conversion
yaml_hash = ::YAML.safe_load(yaml_contents, permitted_classes: [Symbol])
unless yaml_hash.is_a?(Hash) && yaml_hash.key?("resources")
ui.fatal!("YAML recipe '#{source_file}' must contain a top-level 'resources' hash (YAML sequence), i.e. 'resources:'")
end
ui.warn("No resources found in '#{yaml_file}'") if yaml_hash["resources"].size == 0
::File.open(ruby_file, "w") do |file|
file.write(resource_hash_to_string(yaml_hash["resources"], yaml_file))
end
ui.info("Converted '#{yaml_file}' to '#{ruby_file}'")
end
# Converts a Hash of resources to a Ruby recipe
# returns a string ready to be written to a file or stdout
def resource_hash_to_string(resource_hash, filename)
ruby_contents = []
ruby_contents << "# Autoconverted recipe from #{filename}\n"
resource_hash.each do |r|
type = r.delete("type")
name = r.delete("name")
ruby_contents << "#{type} \"#{name}\" do"
r.each do |k, v|
ruby_contents << " #{k} #{v.inspect}"
end
ruby_contents << "end\n"
end
ruby_contents.join("\n")
end
end
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