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#!/usr/bin/env escript
%% vim:ft=erlang:sw=2:et:
main(["show-rel"]) ->
Rel = get_rel(),
io:format("~p.~n", [Rel]);
main(["gen-boot"]) ->
generate_rel(),
generate_boot().
get_rel() ->
ok = application:load(rabbit),
Apps0 = get_apps(rabbit),
Apps1 = lists:sort(
fun
(_, rabbitmq_prelaunch) -> false;
(rabbitmq_prelaunch, _) -> true;
(_, mnesia) -> true;
(mnesia, _) -> false;
(A, B) -> A =< B
end, Apps0),
Apps = [{App, get_vsn(App)} || App <- Apps1],
ERTSVersion = erlang:system_info(version),
RabbitVersion = get_vsn(rabbit),
{release,
{"RabbitMQ", RabbitVersion},
{erts, ERTSVersion},
Apps}.
get_apps(App) ->
ok = load_app(App),
{ok, DirectDeps} = application:get_key(App, applications),
lists:umerge(
[lists:usort(get_apps(Dep)) || Dep <- DirectDeps] ++
[lists:usort([kernel, stdlib, sasl, App, mnesia])]).
load_app(App) ->
case application:load(App) of
ok -> ok;
{error, {already_loaded, App}} -> ok
end.
generate_rel() ->
Rel = get_rel(),
io:format("~p.~n", [Rel]),
Output = io_lib:format("~p.~n", [Rel]),
ok = file:write_file("rabbit.rel", Output).
generate_boot() ->
Options = [local, {path, code:get_path()}],
ok = systools:make_script("rabbit", Options).
get_vsn(App) ->
load_app(App),
{ok, Vsn} = application:get_key(App, vsn),
Vsn.
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