1 files changed, 60 insertions, 0 deletions
diff --git a/lib/chef/mixin/train_helpers.rb b/lib/chef/mixin/train_helpers.rb
new file mode 100644
index 0000000000..1b031ab338
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+++ b/lib/chef/mixin/train_helpers.rb
@@ -0,0 +1,60 @@
+#--
+# Author:: Lamont Granquist <lamont@chef.io>
+# Copyright:: Copyright 2019, 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 "stringio" unless defined?(StringIO)
+
+class Chef
+  module Mixin
+    module TrainHelpers
+
+      #
+      # FIXME: generally these helpers all use the pattern of checking for target_mode?
+      # and then if it is we use train.  That approach should likely be flipped so that
+      # even when we're running without target mode we still use inspec in its local
+      # mode.
+      #
+
+      # Train wrapper around File.exist? to make it local mode aware.
+      #
+      # @param filename filename to check
+      # @return [Boolean] if it exists
+      #
+      def file_exist?(filename)
+        if Chef::Config.target_mode?
+          Chef.run_context.transport_connection.file(filename).exist?
+        else
+          File.exist?(filename)
+        end
+      end
+
+      # XXX: modifications to the StringIO won't get written back
+      # FIXME: this is very experimental and may be a bad idea and may break at any time
+      # @api private
+      #
+      def file_open(*args, &block)
+        if Chef::Config.target_mode?
+          content = Chef.run_context.transport_connection.file(args[0]).content
+          string_io = StringIO.new content
+          yield string_io if block_given?
+          string_io
+        else
+          File.open(*args, &block)
+        end
+      end
+    end
+  end
+end