WIP; Khepri metadata store - phase 1

Author: dumbbell

deps/rabbit/Makefile

@@ -138,7 +138,7 @@ APPS_DIR := $(CURDIR)/apps
 LOCAL_DEPS = sasl rabbitmq_prelaunch os_mon inets compiler public_key crypto ssl syntax_tools xmerl
 
 BUILD_DEPS = rabbitmq_cli
-DEPS = ranch rabbit_common ra sysmon_handler stdout_formatter recon redbug observer_cli osiris amqp10_common syslog systemd seshat
+DEPS = ranch rabbit_common ra sysmon_handler stdout_formatter recon redbug observer_cli osiris amqp10_common syslog systemd seshat khepri
 TEST_DEPS = rabbitmq_ct_helpers rabbitmq_ct_client_helpers amqp_client meck proper
 
 PLT_APPS += mnesia
@@ -147,6 +147,7 @@ dep_syslog = git https://github.com/schlagert/syslog 4.0.0
 dep_osiris = git https://github.com/rabbitmq/osiris main
 dep_systemd = hex 0.6.1
 dep_seshat = git https://github.com/rabbitmq/seshat main
+dep_khepri = git https://github.com/rabbitmq/khepri.git c587fabdab933e1e5f560ddd19bff7acfcecaa88
 
 define usage_xml_to_erl
 $(subst __,_,$(patsubst $(DOCS_DIR)/rabbitmq%.1.xml, src/rabbit_%_usage.erl, $(subst -,_,$(1))))

deps/rabbit/include/internal_user.hrl

@@ -0,0 +1,13 @@
+%% This Source Code Form is subject to the terms of the Mozilla Public
+%% License, v. 2.0. If a copy of the MPL was not distributed with this
+%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
+%%
+%% Copyright (c) 2021 VMware, Inc. or its affiliates.  All rights reserved.
+%%
+
+-define(is_internal_user(V),
+        (?is_internal_user_v2(V) orelse
+         ?is_internal_user_v1(V))).
+
+-define(is_internal_user_v1(V), is_record(V, internal_user, 5)).
+-define(is_internal_user_v2(V), is_record(V, internal_user, 6)).

deps/rabbit/src/rabbit.erl

@@ -366,6 +366,10 @@ run_prelaunch_second_phase() ->
 
     ok = rabbit_ra_systems:setup(Context),
 
+    %% Khepri requires the "coordination" Ra system to be started by the
+    %% previous call, but will ensure it runs anyway.
+    ok = rabbit_khepri:setup(Context),
+
     ?LOG_DEBUG(""),
     ?LOG_DEBUG("== Prelaunch DONE =="),