janl commented on a change in pull request #756: Make couch_peruser a proper 
Erlang app
URL: https://github.com/apache/couchdb/pull/756#discussion_r143389419
 
 

 ##########
 File path: src/couch_peruser/src/couch_peruser.erl
 ##########
 @@ -157,50 +258,86 @@ remove_user(User, Prop, {Modified, SecProps}) ->
                    {<<"names">>, lists:delete(User, Names)})}})}
     end.
 
+-spec ensure_security(User :: binary(), UserDb :: binary(), TransformFun :: 
fun()) -> ok.
 ensure_security(User, UserDb, TransformFun) ->
-    {ok, Shards} = fabric:get_all_security(UserDb, [?ADMIN_CTX]),
-    {_ShardInfo, {SecProps}} = hd(Shards),
-    % assert that shards have the same security object
-    true = lists:all(fun ({_, {SecProps1}}) ->
-        SecProps =:= SecProps1
-    end, Shards),
-    case lists:foldl(
-           fun (Prop, SAcc) -> TransformFun(User, Prop, SAcc) end,
-           {false, SecProps},
-           [<<"admins">>, <<"members">>]) of
-    {false, _} ->
-        ok;
-    {true, SecProps1} ->
-        ok = fabric:set_security(UserDb, {SecProps1}, [?ADMIN_CTX])
+    case fabric:get_all_security(UserDb, [?ADMIN_CTX]) of
+    {error, no_majority} ->
+       % TODO: make sure this is still true: single node, ignore
+       ok;
+    {ok, Shards} ->
+        {_ShardInfo, {SecProps}} = hd(Shards),
+        % assert that shards have the same security object
+        true = lists:all(fun ({_, {SecProps1}}) ->
+            SecProps =:= SecProps1
+        end, Shards),
+        case lists:foldl(
+               fun (Prop, SAcc) -> TransformFun(User, Prop, SAcc) end,
+               {false, SecProps},
+               [<<"admins">>, <<"members">>]) of
+        {false, _} ->
+            ok;
+        {true, SecProps1} ->
+            ok = fabric:set_security(UserDb, {SecProps1}, [?ADMIN_CTX])
+        end
     end.
 
+-spec user_db_name(User :: binary()) -> binary().
 user_db_name(User) ->
     HexUser = list_to_binary(
         [string:to_lower(integer_to_list(X, 16)) || <<X>> <= User]),
     <<?USERDB_PREFIX,HexUser/binary>>.
 
+-spec exit_changes(ClusterState :: #clusterState{}) -> ok.
+exit_changes(ClusterState) ->
+    lists:foreach(fun (State) ->
+        demonitor(State#state.changes_ref, [flush]),
+        exit(State#state.changes_pid, kill)
 
 Review comment:
   I think I?d prefer to rely on couch_peruser_sup to restart us, rather than 
handling exits and re-init of changes listeners ourselves.
 
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