(PDK-1107) Add pdk config get CLI command

Previously there was no way to display what the current configuration the PDK
was using.  This commit adds a `pdk config` command, with a single `get`
sub-command.

This commit also adds the ability to filter the settings either by a specific
name or setting treename.

This commit also adds tests for the new resolve method in the Namespace object.

lib/pdk/cli.rb

@@ -143,6 +143,7 @@ def self.puppet_dev_option(dsl)
 
   require 'pdk/cli/bundle'
   require 'pdk/cli/build'
+  require 'pdk/cli/config'
   require 'pdk/cli/convert'
   require 'pdk/cli/new'
   require 'pdk/cli/test'

lib/pdk/cli/config.rb

@@ -0,0 +1,20 @@
+module PDK::CLI
+  @config_cmd = @base_cmd.define_command do
+    name 'config'
+    usage _('config [subcommand] [options]')
+    summary _('Configure the Puppet Development Kit.')
+    default_subcommand 'get'
+
+    run do |_opts, args, _cmd|
+      if args == ['help']
+        PDK::CLI.run(%w[config --help])
+        exit 0
+      end
+
+      PDK::CLI.run(%w[config get]) if args.empty?
+    end
+  end
+  @config_cmd.add_command Cri::Command.new_basic_help
+end
+
+require 'pdk/cli/config/get'

lib/pdk/cli/config/get.rb

@@ -0,0 +1,18 @@
+module PDK::CLI
+  @config_get_cmd = @config_cmd.define_command do
+    name 'get'
+    usage _('config get [name]')
+    summary _('Retrieve the configuration for <name>. If not specified, retrieve all configuration settings')
+
+    run do |_opts, args, _cmd|
+      item_name = args[0]
+      resolved_config = PDK::Config.new.resolve(item_name)
+      # If the user wanted to know a setting but it doesn't exist, raise an error
+      if resolved_config.empty? && !item_name.nil?
+        PDK.logger.error(_("Configuration item '%{name}' does not exist") % { name: item_name })
+        exit 1
+      end
+      resolved_config.keys.sort.each { |key| puts _('%{name}=%{value}') % { name: key, value: resolved_config[key] } }
+    end
+  end
+end

lib/pdk/config.rb

@@ -33,6 +33,14 @@ def user
       end
     end
 
+    # Resolves *all* filtered settings from all namespaces
+    #
+    # @param filter [String] Only resolve setting names which match the filter. See PDK::Config::Namespace.be_resolved? for matching rules
+    # @return [Hash{String => Object}] All resolved settings for example {'user.module_defaults.author' => 'johndoe'}
+    def resolve(filter = nil)
+      user.resolve(filter)
+    end
+
     def self.bolt_analytics_config
       file = File.expand_path('~/.puppetlabs/bolt/analytics.yaml')
       PDK::Config::YAML.new(file: file)

lib/pdk/config/namespace.rb

@@ -138,6 +138,28 @@ def to_h
         end
       end
 
+      # Resolves all filtered settings, including child namespaces, fully namespaced and filling in default values.
+      #
+      # @param filter [String] Only resolve setting names which match the filter. See #be_resolved? for matching rules
+      # @return [Hash{String => Object}] All resolved settings for example {'user.module_defaults.author' => 'johndoe'}
+      def resolve(filter = nil)
+        # Explicitly force values to be loaded if they have not already
+        # done so. This will not cause them to be persisted to disk
+        (@values.keys - data.keys).each { |key_name| self[key_name] }
+        resolved = {}
+        data.each do |data_name, obj|
+          case obj
+          when PDK::Config::Namespace
+            # Query the child namespace
+            resolved.merge!(obj.resolve(filter))
+          else
+            setting_name = [name, data_name.to_s].join('.')
+            resolved[setting_name] = self[data_name] if be_resolved?(setting_name, filter)
+          end
+        end
+        resolved
+      end
+
       # @return [Boolean] true if the namespace has a parent, otherwise false.
       def child_namespace?
         !parent.nil?
@@ -168,6 +190,21 @@ def include_in_parent?
 
       private
 
+      # Determines whether a setting name should be resolved using the filter
+      #  Returns true when filter is nil.
+      #  Returns true if the filter is exactly the same name as the setting.
+      #  Returns true if the name is a sub-key of the filter e.g.
+      #    Given a filter of user.module_defaults, `user.module_defaults.author` will return true, but `user.analytics.disabled` will return false.
+      #
+      # @param name [String] The setting name to test.
+      # @param filter [String] The filter used to test on the name.
+      # @return [Boolean] Whether the name passes the filter.
+      def be_resolved?(name, filter = nil)
+        return true if filter.nil? # If we're not filtering, this value should always be resolved
+        return true if name == filter # If it's exactly the same name then it should be resolved
+        name.start_with?(filter + '.') # If name is a subkey of the filter then it should be resolved
+      end
+
       # @abstract Subclass and override {#parse_data} to implement parsing logic
       #   for a particular config file format.
       #

spec/acceptance/config_get_spec.rb

@@ -0,0 +1,40 @@
+require 'spec_helper_acceptance'
+require 'fileutils'
+
+describe 'pdk config get' do
+  include_context 'with a fake TTY'
+
+  context 'when run outside of a module' do
+    describe command('pdk config get') do
+      its(:exit_status) { is_expected.to eq 0 }
+      # This setting should appear in all pdk versions
+      its(:stdout) { is_expected.to match(%r{user\.analytics\.user-id=}) }
+      its(:stderr) { is_expected.to be_empty }
+    end
+
+    describe command('pdk config get user.analytics.disabled') do
+      its(:exit_status) { is_expected.to eq 0 }
+      # This setting, and only, this setting should appear in output
+      its(:stdout) { is_expected.to eq("user.analytics.disabled=true\n") }
+      its(:stderr) { is_expected.to be_empty }
+    end
+
+    describe command('pdk config get user.analytics') do
+      its(:exit_status) { is_expected.to eq 0 }
+      # There should be two configuration items returned
+      its(:stdout) { expect(is_expected.target.split("\n").count).to eq(2) }
+      its(:stdout) do
+        result = is_expected.target.split("\n").sort
+        expect(result[0]).to match('user.analytics.disabled=true')
+        expect(result[1]).to match(%r{user.analytics.user-id=.+})
+      end
+      its(:stderr) { is_expected.to be_empty }
+    end
+
+    describe command('pdk config get does.not.exist') do
+      its(:exit_status) { is_expected.not_to eq(0) }
+      its(:stdout) { is_expected.to be_empty }
+      its(:stderr) { is_expected.to match(%r{does\.not\.exist}) }
+    end
+  end
+end

spec/acceptance/config_spec.rb

@@ -0,0 +1,15 @@
+require 'spec_helper_acceptance'
+require 'fileutils'
+
+describe 'pdk config' do
+  include_context 'with a fake TTY'
+
+  context 'when run outside of a module' do
+    describe command('pdk config') do
+      its(:exit_status) { is_expected.to eq 0 }
+      # This setting should appear in all pdk versions
+      its(:stdout) { is_expected.to match(%r{user\.analytics\.user-id=}) }
+      its(:stderr) { is_expected.to be_empty }
+    end
+  end
+end

spec/unit/pdk/config/namespace_spec.rb

@@ -139,6 +139,61 @@
     end
   end
 
+  describe '#resolve' do
+    let(:config_options) { { persistent_defaults: false } }
+
+    include_context :with_a_mounted_file_with_content, 'mounted', '{"setting1": "value1"}'
+
+    before(:each) do
+      # Add a value with a default value
+      config.value('spec_test') do
+        default_to { 'spec_default' }
+      end
+      # The resolver should not trigger any saves unless persistent_defaults is set to true
+      expect(PDK::Util::Filesystem).to receive(:write_file).never
+    end
+
+    context 'with an empty filter' do
+      let(:filter) { nil }
+
+      it 'resolves all settings' do
+        result = config.resolve(filter)
+        expect(result.count).to eq(2)
+        expect(result['config.spec_test']).to eq('spec_default')
+        expect(result['config.mounted.setting1']).to eq('value1')
+      end
+    end
+
+    context 'with a setting name' do
+      let(:filter) { 'config.spec_test' }
+
+      it 'resolves only one setting' do
+        result = config.resolve(filter)
+        expect(result.count).to eq(1)
+        expect(result['config.spec_test']).to eq('spec_default')
+      end
+    end
+
+    context 'with a tree name' do
+      let(:filter) { 'config.mounted' }
+
+      it 'resolves only settings in the tree' do
+        result = config.resolve(filter)
+        expect(result.count).to eq(1)
+        expect(result['config.mounted.setting1']).to eq('value1')
+      end
+    end
+
+    context 'with a name that cannot be resolved' do
+      let(:filter) { 'does.not.exist' }
+
+      it 'returns an empty hash' do
+        result = config.resolve(filter)
+        expect(result).to eq({})
+      end
+    end
+  end
+
   describe '#namespace' do
     before(:each) do
       config.namespace('test')

spec/unit/pdk/config_spec.rb

@@ -96,6 +96,11 @@ def mock_file(path, content)
       end
     end
 
+    def uuid_regex(uuid)
+      # Depending on the YAML or JSON generator, it may, or may not have quotes
+      %r{user-id: (?:#{uuid}|'#{uuid}'|\"#{uuid}\")}
+    end
+
     context 'default value' do
       context 'when there is no pre-existing bolt configuration' do
         it 'generates a new UUID' do
@@ -107,7 +112,7 @@ def mock_file(path, content)
           new_id = SecureRandom.uuid
           expect(SecureRandom).to receive(:uuid).and_return(new_id)
           # Expect that the user-id is saved to the config file
-          expect(PDK::Util::Filesystem).to receive(:write_file).with(File.expand_path(described_class.analytics_config_path), %r{user-id: #{new_id}})
+          expect(PDK::Util::Filesystem).to receive(:write_file).with(File.expand_path(described_class.analytics_config_path), uuid_regex(new_id))
           # ... and that it returns the new id
           expect(config.user['analytics']['user-id']).to eq(new_id)
         end
@@ -123,7 +128,7 @@ def mock_file(path, content)
 
         it 'saves the UUID to the analytics config file' do
           # Expect that the user-id is saved to the config file
-          expect(PDK::Util::Filesystem).to receive(:write_file).with(File.expand_path(described_class.analytics_config_path), %r{user-id: #{uuid}})
+          expect(PDK::Util::Filesystem).to receive(:write_file).with(File.expand_path(described_class.analytics_config_path), uuid_regex(uuid))
           config.user['analytics']['user-id']
         end
 
@@ -144,7 +149,7 @@ def mock_file(path, content)
             new_id = SecureRandom.uuid
             expect(SecureRandom).to receive(:uuid).and_return(new_id)
             # Expect that the user-id is saved to the config file
-            expect(PDK::Util::Filesystem).to receive(:write_file).with(File.expand_path(described_class.analytics_config_path), %r{user-id: #{new_id}})
+            expect(PDK::Util::Filesystem).to receive(:write_file).with(File.expand_path(described_class.analytics_config_path), uuid_regex(new_id))
             # ... and that it returns the new id
             expect(config.user['analytics']['user-id']).to eq(new_id)
           end