erlang: Add parameter for Erlang Solutions repositories

erlang/manifests/init.pp

@@ -1,6 +1,24 @@
 # Install erlang.
 #
-class erlang {
+# === Parameters
+#
+# $erlang_solutions:
+#   Use Erlang Solutions repositories. Defaults to false.
+#
+class erlang(
+  $erlang_solutions=false,
+) {
+
+  if $erlang_solutions == true {
+    case $::operatingsystem {
+      'centos': {
+        require yum::repo::erlang_solutions
+      }
+      default: {
+        fail("Erlang Solutions not supported on ${::operatingsystem}.")
+      }
+    }
+  }
 
   case $::operatingsystem {
     'centos','redhat','fedora': {