rabbah commented on a change in pull request #3215: adding namePrefix config to 
ContainerArgsConfig
URL: 
https://github.com/apache/incubator-openwhisk/pull/3215#discussion_r163698889
 
 

 ##########
 File path: 
common/scala/src/main/scala/whisk/core/containerpool/ContainerFactory.scala
 ##########
 @@ -50,6 +50,15 @@ trait ContainerFactory {
   def cleanup(): Unit
 }
 
+object ContainerFactory {
+
+  /** include the instance name, if specified and strip invalid chars before 
attempting to use them in the container name */
+  def containerNamePrefix(instanceId: InstanceId): String =
+    s"wsk${instanceId.name.getOrElse("")}${instanceId.toInt}"
+      .replaceAll("[^a-zA-Z0-9_\\.\\-]", "") // based on 
https://github.com/moby/moby/issues/3138 and 
https://github.com/moby/moby/blob/master/daemon/names/names.go
 
 Review comment:
   Since there?s a replace all subsequently should we remove this and trust the 
invariant is asserted elsewhere?

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