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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License
%% at http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is VMware, Inc.
%% Copyright (c) 2007-2012 VMware, Inc. All rights reserved.
%%
-module(rabbit_release).
-export([start/0]).
-include("rabbit.hrl").
-define(BaseApps, [rabbit]).
-define(ERROR_CODE, 1).
%% We need to calculate all the ERTS apps we need to ship with a
%% standalone rabbit. To acomplish that we need to unpack and load the plugins
%% apps that are shiped with rabbit.
%% Once we get that we generate an erlang release inside a tarball.
%% Our make file will work with that release to generate our final rabbitmq
%% package.
start() ->
%% Determine our various directories
[PluginsDistDir, UnpackedPluginDir, RabbitHome] =
init:get_plain_arguments(),
RootName = UnpackedPluginDir ++ "/rabbit",
%% extract the plugins so we can load their apps later
prepare_plugins(PluginsDistDir, UnpackedPluginDir),
%% add the plugin ebin folder to the code path.
add_plugins_to_path(UnpackedPluginDir),
PluginAppNames = [P#plugin.name ||
P <- rabbit_plugins:list(PluginsDistDir)],
%% Build the entire set of dependencies - this will load the
%% applications along the way
AllApps = case catch sets:to_list(expand_dependencies(PluginAppNames)) of
{failed_to_load_app, App, Err} ->
terminate("failed to load application ~s:~n~p",
[App, Err]);
AppList ->
AppList
end,
%% we need a list of ERTS apps we need to ship with rabbit
BaseApps = AllApps -- PluginAppNames,
AppVersions = [determine_version(App) || App <- BaseApps],
RabbitVersion = proplists:get_value(rabbit, AppVersions),
%% Build the overall release descriptor
RDesc = {release,
{"rabbit", RabbitVersion},
{erts, erlang:system_info(version)},
AppVersions},
%% Write it out to $RABBITMQ_PLUGINS_EXPAND_DIR/rabbit.rel
rabbit_file:write_file(RootName ++ ".rel", io_lib:format("~p.~n", [RDesc])),
%% Compile the script
systools:make_script(RootName),
systools:script2boot(RootName),
%% Make release tarfile
make_tar(RootName, RabbitHome),
rabbit_misc:quit(0).
make_tar(Release, RabbitHome) ->
systools:make_tar(Release,
[
{dirs, [docs, etc, include, plugins, sbin, share]},
{erts, code:root_dir()},
{outdir, RabbitHome}
]).
determine_version(App) ->
application:load(App),
{ok, Vsn} = application:get_key(App, vsn),
{App, Vsn}.
delete_recursively(Fn) ->
case rabbit_file:recursive_delete([Fn]) of
ok -> ok;
{error, {Path, E}} -> {error, {cannot_delete, Path, E}};
Error -> Error
end.
prepare_plugins(PluginsDistDir, DestDir) ->
%% Eliminate the contents of the destination directory
case delete_recursively(DestDir) of
ok -> ok;
{error, E} -> terminate("Could not delete dir ~s (~p)", [DestDir, E])
end,
case filelib:ensure_dir(DestDir ++ "/") of
ok -> ok;
{error, E2} -> terminate("Could not create dir ~s (~p)", [DestDir, E2])
end,
[prepare_plugin(Plugin, DestDir) ||
Plugin <- rabbit_plugins:list(PluginsDistDir)].
prepare_plugin(#plugin{type = ez, location = Location}, PluginDestDir) ->
zip:unzip(Location, [{cwd, PluginDestDir}]);
prepare_plugin(#plugin{type = dir, name = Name, location = Location},
PluginsDestDir) ->
rabbit_file:recursive_copy(Location,
filename:join([PluginsDestDir, Name])).
expand_dependencies(Pending) ->
expand_dependencies(sets:new(), Pending).
expand_dependencies(Current, []) ->
Current;
expand_dependencies(Current, [Next|Rest]) ->
case sets:is_element(Next, Current) of
true ->
expand_dependencies(Current, Rest);
false ->
case application:load(Next) of
ok ->
ok;
{error, {already_loaded, _}} ->
ok;
{error, Reason} ->
throw({failed_to_load_app, Next, Reason})
end,
{ok, Required} = application:get_key(Next, applications),
Unique = [A || A <- Required, not(sets:is_element(A, Current))],
expand_dependencies(sets:add_element(Next, Current), Rest ++ Unique)
end.
add_plugins_to_path(PluginDir) ->
[add_plugin_to_path(PluginName) ||
PluginName <- filelib:wildcard(PluginDir ++ "/*/ebin/*.app")].
add_plugin_to_path(PluginAppDescFn) ->
%% Add the plugin ebin directory to the load path
PluginEBinDirN = filename:dirname(PluginAppDescFn),
code:add_path(PluginEBinDirN).
terminate(Fmt, Args) ->
io:format("ERROR: " ++ Fmt ++ "~n", Args),
rabbit_misc:quit(?ERROR_CODE).
|
