Remove non-existing nodes from repositories

config/config.go

@@ -304,10 +304,19 @@ func Load(rd io.Reader, myID protocol.NodeID) (Configuration, error) {
 		}
 	}
 
+	// Build a list of available nodes
+	existingNodes := make(map[protocol.NodeID]bool)
+	existingNodes[myID] = true
+	for _, node := range cfg.Nodes {
+		existingNodes[node.NodeID] = true
+	}
+
 	// Ensure this node is present in all relevant places
+	// Ensure that any loose nodes are not present in the wrong places
 	cfg.Nodes = ensureNodePresent(cfg.Nodes, myID)
 	for i := range cfg.Repositories {
 		cfg.Repositories[i].Nodes = ensureNodePresent(cfg.Repositories[i].Nodes, myID)
+		cfg.Repositories[i].Nodes = ensureExistingNodes(cfg.Repositories[i].Nodes, existingNodes)
 	}
 
 	// An empty address list is equivalent to a single "dynamic" entry
@@ -392,3 +401,20 @@ func ensureNodePresent(nodes []NodeConfiguration, myID protocol.NodeID) []NodeCo
 
 	return nodes
 }
+
+func ensureExistingNodes(nodes []NodeConfiguration, existingNodes map[protocol.NodeID]bool) []NodeConfiguration {
+	i := 0
+	for _, node := range nodes {
+		if _, ok := existingNodes[node.NodeID]; !ok {
+			last := len(nodes) - 1
+			nodes[i] = nodes[last]
+			nodes = nodes[:last]
+		} else {
+			i++
+		}
+	}
+
+	sort.Sort(NodeConfigurationList(nodes))
+
+	return nodes
+}

config/config_test.go

@@ -70,6 +70,7 @@ func TestNodeConfig(t *testing.T) {
 <configuration version="2">
     <repository id="test" directory="~/Sync" ro="true">
         <node id="AIR6LPZ7K4PTTUXQSMUUCPQ5YWOEDFIIQJUG7772YQXXR5YD6AWQ"/>
+        <node id="C4YBIESWDUAIGU62GOSRXCRAAJDWVE3TKCPMURZE2LH5QHAF576A"/>
         <node id="P56IOI7MZJNU2IQGDREYDM2MGTMGL3BXNPQ6W5BTBBZ4TJXZWICQ"/>
     </repository>
     <node id="AIR6LPZ7K4PTTUXQSMUUCPQ5YWOEDFIIQJUG7772YQXXR5YD6AWQ" name="node one">