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|
%%%-------------------------------------------------------------------
%%% File : ejabberd_update.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : ejabberd code updater
%%% Created : 27 Jan 2006 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2008 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%-------------------------------------------------------------------
-module(ejabberd_update).
-author('alexey@process-one.net').
%% API
-export([update/0, update_info/0]).
-include("ejabberd.hrl").
%%====================================================================
%% API
%%====================================================================
update() ->
case update_info() of
{ok, Dir, _UpdatedBeams, _Script, LowLevelScript, _Check} ->
Eval =
release_handler_1:eval_script(
LowLevelScript, [],
[{ejabberd, "", filename:join(Dir, "..")}]),
?INFO_MSG("eval: ~p~n", [Eval]),
Eval;
{error, Reason} ->
{error, Reason}
end.
update_info() ->
Dir = filename:dirname(code:which(ejabberd)),
case file:list_dir(Dir) of
{ok, Files} ->
Beams = [list_to_atom(filename:rootname(FN)) ||
FN <- Files, lists:suffix(".beam", FN)],
UpdatedBeams =
lists:filter(
fun(Module) ->
{ok, {Module, NewVsn}} =
beam_lib:version(code:which(Module)),
case code:is_loaded(Module) of
{file, _} ->
Attrs = Module:module_info(attributes),
{value, {vsn, CurVsn}} =
lists:keysearch(vsn, 1, Attrs),
NewVsn /= CurVsn;
false ->
false
end
end, Beams),
?INFO_MSG("beam files: ~p~n", [UpdatedBeams]),
Script = make_script(UpdatedBeams),
?INFO_MSG("script: ~p~n", [Script]),
LowLevelScript = make_low_level_script(UpdatedBeams, Script),
?INFO_MSG("low level script: ~p~n", [LowLevelScript]),
Check =
release_handler_1:check_script(
LowLevelScript,
[{ejabberd, "", filename:join(Dir, "..")}]),
?INFO_MSG("check: ~p~n", [Check]),
{ok, Dir, UpdatedBeams, Script, LowLevelScript, Check};
{error, Reason} ->
{error, Reason}
end.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
%% From systools.hrl
-record(application,
{name, %% Name of the application, atom().
type = permanent, %% Application start type, atom().
vsn = "", %% Version of the application, string().
id = "", %% Id of the application, string().
description = "", %% Description of application, string().
modules = [], %% [Module | {Module,Vsn}] of modules
%% incorporated in the application,
%% Module = atom(), Vsn = string().
uses = [], %% [Application] list of applications required
%% by the application, Application = atom().
includes = [], %% [Application] list of applications included
%% by the application, Application = atom().
regs = [], %% [RegNames] a list of registered process
%% names used by the application, RegNames =
%% atom().
env = [], %% [{Key,Value}] environment variable of
%% application, Key = Value = term().
maxT = infinity, %% Max time an application may exist,
%% integer() | infinity.
maxP = infinity, %% Max number of processes in an application,
%% integer() | infinity.
mod = [], %% [] | {Mod, StartArgs}, Mod= atom(),
%% StartArgs = list().
start_phases = [], %% [] | {Phase, PhaseArgs}, Phase = atom(),
%% PhaseArgs = list().
dir = "" %% The directory where the .app file was
%% found (internal use).
}).
make_script(UpdatedBeams) ->
lists:map(
fun(Module) ->
{ok, {Module, [{attributes, NewAttrs}]}} =
beam_lib:chunks(code:which(Module), [attributes]),
CurAttrs = Module:module_info(attributes),
case lists:keysearch(update_info, 1, NewAttrs) of
{value, {_, [{update, _}]}} ->
case lists:keysearch(update_info, 1, CurAttrs) of
{value, {_, [{update, Extra}]}} ->
{update, Module, {advanced, Extra}};
false ->
{update, Module, {advanced, 0}}
end;
false ->
{load_module, Module}
end
end, UpdatedBeams).
make_low_level_script(UpdatedBeams, Script) ->
EJDApp = #application{name = ejabberd,
modules = UpdatedBeams},
{ok, LowLevelScript} =
systools_rc:translate_scripts([Script], [EJDApp], [EJDApp]),
LowLevelScript.
|
