chore(build): fix rebar dependency and add a script to ensure integrity

apps/emqx_sasl/rebar.config

@@ -1,5 +1,5 @@
 {deps,
- [{pbkdf2, {git, "https://github.com/emqx/erlang-pbkdf2.git", {branch, "2.0.3"}}}
+ [{pbkdf2, {git, "https://github.com/emqx/erlang-pbkdf2.git", {branch, "2.0.4"}}}
  ]}.
 
 {edoc_opts, [{preprocess, true}]}.

apps/emqx_telemetry/rebar.config

@@ -1,14 +1 @@
-{edoc_opts, [{preprocess, true}]}.
-{erl_opts, [warn_unused_vars,
-            warn_shadow_vars,
-            warn_unused_import,
-            warn_obsolete_guard,
-            debug_info,
-            {parse_transform}]}.
-
-{xref_checks, [undefined_function_calls, undefined_functions,
-               locals_not_used, deprecated_function_calls,
-               warnings_as_errors, deprecated_functions]}.
-{cover_enabled, true}.
-{cover_opts, [verbose]}.
-{cover_export_enabled, true}.
+{deps, []}.

scripts/check-deps-integrity.escript

@@ -0,0 +1,63 @@
+#!/usr/bin/env escript
+
+%% NOTE: this script should be executed at project root.
+
+-mode(compile).
+
+main([]) ->
+    AppsDir = case filelib:is_file("EMQX_ENTERPRISE") of
+                  true -> "lib-ee";
+                  false -> "lib-ce"
+              end,
+    true = filelib:is_dir(AppsDir),
+    Files = ["rebar.config"] ++
+            apps_rebar_config("apps") ++
+            apps_rebar_config(AppsDir),
+    Deps = collect_deps(Files, #{}),
+    case count_bad_deps(Deps) of
+        0 ->
+            io:format("OK~n");
+        N ->
+            io:format(standard_error, "~p dependency discrepancies", [N]),
+            halt(1)
+    end.
+
+apps_rebar_config(Dir) ->
+    filelib:wildcard(filename:join([Dir, "*", "rebar.config"])).
+
+%% collect a kv-list of {DepName, [{DepReference, RebarConfigFile}]}
+%% the value part should have unique DepReference
+collect_deps([], Acc) -> maps:to_list(Acc);
+collect_deps([File | Files], Acc) ->
+    Deps =
+        try
+            {ok, Config} = file:consult(File),
+            {deps, Deps0} = lists:keyfind(deps, 1, Config),
+            Deps0
+        catch
+            C : E : St ->
+                erlang:raise(C, {E, {failed_to_find_deps_in_rebar_config, File}}, St)
+        end,
+    collect_deps(Files, do_collect_deps(Deps, File, Acc)).
+
+do_collect_deps([], _File, Acc) -> Acc;
+do_collect_deps([{Name, Ref} | Deps], File, Acc) ->
+    Refs = maps:get(Name, Acc, []),
+    do_collect_deps(Deps, File, Acc#{Name => [{Ref, File} | Refs]}).
+
+count_bad_deps([]) -> 0;
+count_bad_deps([{Name, Refs0} | Rest]) ->
+    Refs = lists:keysort(1, Refs0),
+    case is_unique_ref(Refs) of
+        true ->
+            count_bad_deps(Rest);
+        false ->
+            io:format(standard_error, "~p:~n~p~n", [Name, Refs]),
+            1 + count_bad_deps(Rest)
+    end.
+
+is_unique_ref([_]) -> true;
+is_unique_ref([{Ref, _File1}, {Ref, File2} | Rest]) ->
+    is_unique_ref([{Ref, File2} | Rest]);
+is_unique_ref(_) ->
+    false.