#775 - Explicitly resolve deferred values

lib/puppet/type/concat_file.rb

@@ -296,7 +296,8 @@ def nested_merge(hash1, hash2)
 
   def fragment_content(r)
     if r[:content].nil? == false
-      fragment_content = r[:content]
+      # Explicitly resolve deferred values.
+      fragment_content = r[:content].instance_of?(Puppet::Pops::Evaluator::DeferredValue) ? r[:content].resolve : r[:content]
     elsif r[:source].nil? == false
       @source = nil
       Array(r[:source]).each do |source|

spec/acceptance/fragment_content_with_deferred_function_call_spec.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'spec_helper_acceptance'
+
+# For testing the deferred function call
+require 'digest/md5'
+
+describe 'deferred function call' do
+  attr_reader :basedir
+
+  before(:all) do
+    @basedir = setup_test_directory
+  end
+
+  describe 'file' do
+    let(:pp) do
+      <<-MANIFEST
+        concat { '#{basedir}/deferred_file': }
+
+        concat::fragment { '1':
+          target  => '#{basedir}/deferred_file',
+          content => Deferred('md5', ['test']),
+        }
+      MANIFEST
+    end
+
+    it 'idempotent, file matches' do
+      idempotent_apply(pp)
+      expect(file("#{basedir}/deferred_file")).to be_file
+      expect(file("#{basedir}/deferred_file").content).to match Digest::MD5.hexdigest('test')
+    end
+  end
+end