custom: Added external facts plugin for facter < 1.7

custom/lib/facter/external.rb

@@ -0,0 +1,15 @@
+# Load external key-value facts for facter < 1.7.
+if Facter.value(:facterversion).match(/^1\.[56]/) and
+   File.directory?("/etc/facter/facts.d")
+    Dir.glob("/etc/facter/facts.d/*.txt") do |txt|
+        File.readlines(txt).each do |line|
+            kv = line.strip.split("=", 2)
+            continue if kv.length != 2
+            Facter.add(kv[0].to_sym) do
+                setcode do
+                    kv[1]
+                end
+            end
+        end
+    end
+end