Update spec, noconnection is also a possible error

(cherry picked from commit 36eb6ca)
(cherry picked from commit d809dff)

Author: SimonUnge

deps/rabbit/src/rabbit_db_cluster.erl

@@ -50,7 +50,7 @@ ensure_feature_flags_are_in_sync(Nodes, NodeIsVirgin) ->
       RemoteNode :: node(),
       Ret :: Ok | Error,
       Ok :: {ok, [node()]} | {ok, already_member},
-      Error :: {error, {inconsistent_cluster, string()}}.
+      Error :: {error, {inconsistent_cluster, string()} | {error, {erpc, noconnection}}}.
 
 can_join(RemoteNode) ->
     ?LOG_INFO(
@@ -82,7 +82,7 @@ can_join_using_khepri(RemoteNode) ->
       NodeType :: node_type(),
       Ret :: Ok | Error,
       Ok :: ok | {ok, already_member},
-      Error :: {error, {inconsistent_cluster, string()}}.
+      Error :: {error, {inconsistent_cluster, string()} | {error, {erpc, noconnection}}}.
 %% @doc Adds this node to a cluster using `RemoteNode' to reach it.
 
 join(ThisNode, _NodeType) when ThisNode =:= node() ->
@@ -214,7 +214,7 @@ join(RemoteNode, NodeType)
             end;
         {ok, already_member} ->
             {ok, already_member};
-        {error, {inconsistent_cluster, Msg}} = Error ->
+        {error, {inconsistent_cluster, _Msg}} = Error ->
             case rabbit_khepri:is_enabled() of
                 true  ->
                     Error;
@@ -229,7 +229,9 @@ join(RemoteNode, NodeType)
                                     [RemoteNode, node(), node(), node()]),
                     ok = rabbit_mnesia:leave_discover_cluster(RemoteNode),
                     join(RemoteNode, NodeType)
-            end
+            end;
+        {error, _} = Error ->
+            Error
     end.
 
 join_using_mnesia(ClusterNodes, NodeType) when is_list(ClusterNodes) ->

deps/rabbit/src/rabbit_mnesia.erl

@@ -155,7 +155,7 @@ init() ->
 %% we cluster to its cluster.
 
 -spec can_join_cluster(node())
-                        -> {ok, [node()]} | {ok, already_member} | {error, {inconsistent_cluster, string()}}.
+                      -> {ok, [node()]} | {ok, already_member} | {error, {inconsistent_cluster, string()} | {error, {erpc, noconnection}}}.
 
 can_join_cluster(DiscoveryNode) ->
     ensure_mnesia_dir(),