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rebar_otp_app.erl
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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.com)
%%
%% Permission is hereby granted, free of charge, to any person obtaining a copy
%% of this software and associated documentation files (the "Software"), to deal
%% in the Software without restriction, including without limitation the rights
%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%% copies of the Software, and to permit persons to whom the Software is
%% furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
%% all copies or substantial portions of the Software.
%%
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
%% THE SOFTWARE.
%% -------------------------------------------------------------------
-module(rebar_otp_app).
-export([compile/2,
clean/2]).
%% for internal use only
-export([info/2]).
-include("rebar.hrl").
%% ===================================================================
%% Public API
%% ===================================================================
compile(Config, File) ->
%% If we get an .app.src file, it needs to be pre-processed and
%% written out as a ebin/*.app file. That resulting file will then
%% be validated as usual.
{Config1, AppFile} = case rebar_app_utils:is_app_src(File) of
true ->
preprocess(Config, File);
false ->
{Config, File}
end,
%% Load the app file and validate it.
case rebar_app_utils:load_app_file(Config1, AppFile) of
{ok, Config2, AppName, AppData} ->
validate_name(AppName, AppFile),
%% In general, the list of modules is an important thing to validate
%% for compliance with OTP guidelines and upgrade procedures.
%% However, some people prefer not to validate this list.
case rebar_config:get_local(Config1, validate_app_modules, true) of
true ->
Modules = proplists:get_value(modules, AppData),
{validate_modules(AppName, Modules), Config2};
false ->
{ok, Config2}
end;
{error, Reason} ->
?ABORT("Failed to load app file ~s: ~p\n", [AppFile, Reason])
end.
clean(_Config, File) ->
%% If the app file is a .app.src, delete the generated .app file
case rebar_app_utils:is_app_src(File) of
true ->
case file:delete(rebar_app_utils:app_src_to_app(File)) of
ok ->
ok;
{error, enoent} ->
%% The file not existing is OK, we can ignore the error.
ok;
Other ->
Other
end;
false ->
ok
end.
%% ===================================================================
%% Internal functions
%% ===================================================================
info(help, compile) ->
info_help("Validate .app file");
info(help, clean) ->
info_help("Delete .app file if generated from .app.src").
info_help(Description) ->
?CONSOLE(
"~s.~n"
"~n"
"Valid rebar.config options:~n"
" ~p~n",
[
Description,
{validate_app_modules, true}
]).
preprocess(Config, AppSrcFile) ->
case rebar_app_utils:load_app_file(Config, AppSrcFile) of
{ok, Config1, AppName, AppData} ->
%% Look for a configuration file with vars we want to
%% substitute. Note that we include the list of modules available in
%% ebin/ and update the app data accordingly.
AppVars = load_app_vars(Config1) ++ [{modules, ebin_modules()}],
A1 = apply_app_vars(AppVars, AppData),
%% AppSrcFile may contain instructions for generating a vsn number
{Config2, Vsn} = rebar_app_utils:app_vsn(Config1, AppSrcFile),
A2 = lists:keystore(vsn, 1, A1, {vsn, Vsn}),
%% systools:make_relup/4 fails with {missing_param, registered}
%% without a 'registered' value.
A3 = ensure_registered(A2),
%% Build the final spec as a string
Spec = io_lib:format("~p.\n", [{application, AppName, A3}]),
%% Setup file .app filename and write new contents
AppFile = rebar_app_utils:app_src_to_app(AppSrcFile),
ok = rebar_file_utils:write_file_if_contents_differ(AppFile, Spec),
%% Make certain that the ebin/ directory is available
%% on the code path
true = code:add_path(filename:absname(filename:dirname(AppFile))),
{Config2, AppFile};
{error, Reason} ->
?ABORT("Failed to read ~s for preprocessing: ~p\n",
[AppSrcFile, Reason])
end.
load_app_vars(Config) ->
case rebar_config:get_local(Config, app_vars_file, undefined) of
undefined ->
?INFO("No app_vars_file defined.\n", []),
[];
Filename ->
?INFO("Loading app vars from ~p\n", [Filename]),
{ok, Vars} = file:consult(Filename),
Vars
end.
apply_app_vars([], AppData) ->
AppData;
apply_app_vars([{Key, Value} | Rest], AppData) ->
AppData2 = lists:keystore(Key, 1, AppData, {Key, Value}),
apply_app_vars(Rest, AppData2).
validate_name(AppName, File) ->
%% Convert the .app file name to an atom -- check it against the
%% identifier within the file
ExpApp = list_to_atom(filename:basename(File, ".app")),
case ExpApp == AppName of
true ->
ok;
false ->
?ERROR("Invalid ~s: name of application (~p) "
"must match filename.\n", [File, AppName]),
?FAIL
end.
validate_modules(AppName, undefined) ->
?ERROR("Missing modules declaration in ~p.app~n", [AppName]),
?FAIL;
validate_modules(AppName, Mods) ->
%% Construct two sets -- one for the actual .beam files in ebin/
%% and one for the modules
%% listed in the .app file
EbinSet = ordsets:from_list(ebin_modules()),
ModSet = ordsets:from_list(Mods),
%% Identify .beam files listed in the .app, but not present in ebin/
case ordsets:subtract(ModSet, EbinSet) of
[] ->
ok;
MissingBeams ->
Msg1 = lists:flatten([io_lib:format("\t* ~p\n", [M]) ||
M <- MissingBeams]),
?ERROR("One or more modules listed in ~p.app are not "
"present in ebin/*.beam:\n~s", [AppName, Msg1]),
?FAIL
end,
%% Identify .beam files NOT list in the .app, but present in ebin/
case ordsets:subtract(EbinSet, ModSet) of
[] ->
ok;
MissingMods ->
Msg2 = lists:flatten([io_lib:format("\t* ~p\n", [M]) ||
M <- MissingMods]),
?ERROR("One or more .beam files exist that are not "
"listed in ~p.app:\n~s", [AppName, Msg2]),
?FAIL
end.
ebin_modules() ->
lists:sort([rebar_utils:beam_to_mod("ebin", N) ||
N <- rebar_utils:beams("ebin")]).
ensure_registered(AppData) ->
case lists:keyfind(registered, 1, AppData) of
false ->
[{registered, []} | AppData];
{registered, _} ->
%% We could further check whether the value is a list of atoms.
AppData
end.