correct determination of a host's container images

render/host.go

@@ -35,25 +35,31 @@ var HostRenderer = MakeReduce(
 // If this function is given a node without a hostname
 // (including other pseudo nodes), it will drop the node.
 //
-// Otherwise, this function will produce a node with the correct ID
+// Otherwise, this function will produce nodes with the correct ID
 // format for a host, but without any Major or Minor labels.  It does
 // not have enough info to do that, and the resulting graph must be
 // merged with a host graph to get that info.
 func MapX2Host(n report.Node, _ report.Networks) report.Nodes {
-	// Don't propagate all pseudo nodes - we do this in MapEndpoint2Host
+	// Don't propagate pseudo nodes - we do this in MapEndpoint2Host
 	if n.Topology == Pseudo {
 		return report.Nodes{}
 	}
-	hostNodeID, timestamp, ok := n.Latest.LookupEntry(report.HostNodeID)
+
+	hostIDs, ok := n.Parents.Lookup(report.Host)
 	if !ok {
 		return report.Nodes{}
 	}
-	id := report.MakeHostNodeID(report.ExtractHostID(n))
-	result := NewDerivedNode(id, n).WithTopology(report.Host)
-	result.Latest = result.Latest.Set(report.HostNodeID, timestamp, hostNodeID)
-	result.Counters = result.Counters.Add(n.Topology, 1)
-	result.Children = report.MakeNodeSet(n)
-	return report.Nodes{id: result}
+
+	result := report.Nodes{}
+	children := report.MakeNodeSet(n)
+	for _, id := range hostIDs {
+		node := NewDerivedNode(id, n).WithTopology(report.Host)
+		node.Counters = node.Counters.Add(n.Topology, 1)
+		node.Children = children
+		result[id] = node
+	}
+
+	return result
 }
 
 // MapEndpoint2Host takes nodes from the endpoint topology and produces