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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% Copyright (c) 2011 Trifork
%%
%% 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_prv_shell).
-author("Kresten Krab Thorup <krab@trifork.com>").
-behaviour(provider).
-export([init/1,
do/1,
format_error/1]).
-include("rebar.hrl").
-define(PROVIDER, shell).
-define(DEPS, [compile]).
%% ===================================================================
%% Public API
%% ===================================================================
-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
init(State) ->
State1 = rebar_state:add_provider(State, providers:create([{name, ?PROVIDER},
{module, ?MODULE},
{bare, false},
{deps, ?DEPS},
{example, "rebar3 shell"},
{short_desc, "Run shell with project apps and deps in path."},
{desc, info()},
{opts, [{config, undefined, "config", string, "Path to the config file to use. Defaults to the sys_config defined for relx, if present."}]}])),
{ok, State1}.
-spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
do(Config) ->
shell(Config),
{ok, Config}.
-spec format_error(any()) -> iolist().
format_error(Reason) ->
io_lib:format("~p", [Reason]).
%% NOTE:
%% this is an attempt to replicate `erl -pa ./ebin -pa deps/*/ebin`. it is
%% mostly successful but does stop and then restart the user io system to get
%% around issues with rebar being an escript and starting in `noshell` mode.
%% it also lacks the ctrl-c interrupt handler that `erl` features. ctrl-c will
%% immediately kill the script. ctrl-g, however, works fine
shell(State) ->
%% scan all processes for any with references to the old user and save them to
%% update later
NeedsUpdate = [Pid || Pid <- erlang:processes(),
proplists:get_value(group_leader, erlang:process_info(Pid)) == whereis(user)
],
%% terminate the current user
ok = supervisor:terminate_child(kernel_sup, user),
%% start a new shell (this also starts a new user under the correct group)
_ = user_drv:start(),
%% wait until user_drv and user have been registered (max 3 seconds)
ok = wait_until_user_started(3000),
%% set any process that had a reference to the old user's group leader to the
%% new user process
_ = [erlang:group_leader(whereis(user), Pid) || Pid <- NeedsUpdate],
%% enable error_logger's tty output
ok = error_logger:swap_handler(tty),
%% disable the simple error_logger (which may have been added multiple
%% times). removes at most the error_logger added by init and the
%% error_logger added by the tty handler
ok = remove_error_handler(3),
%% Add deps to path
code:add_pathsa(rebar_state:code_paths(State, all_deps)),
%% add project app test paths
ok = add_test_paths(State),
%% try to read in sys.config file
ok = reread_config(State),
%% this call never returns (until user quits shell)
timer:sleep(infinity).
info() ->
"Start a shell with project and deps preloaded similar to~n'erl -pa ebin -pa deps/*/ebin'.~n".
remove_error_handler(0) ->
?WARN("Unable to remove simple error_logger handler", []);
remove_error_handler(N) ->
case gen_event:delete_handler(error_logger, error_logger, []) of
{error, module_not_found} -> ok;
{error_logger, _} -> remove_error_handler(N-1)
end.
%% Timeout is a period to wait before giving up
wait_until_user_started(0) ->
?ABORT("Timeout exceeded waiting for `user` to register itself", []),
erlang:error(timeout);
wait_until_user_started(Timeout) ->
case whereis(user) of
%% if user is not yet registered wait a tenth of a second and try again
undefined -> timer:sleep(100), wait_until_user_started(Timeout - 100);
_ -> ok
end.
add_test_paths(State) ->
lists:foreach(fun(App) ->
AppDir = rebar_app_info:out_dir(App),
%% ignore errors resulting from non-existent directories
_ = code:add_path(filename:join([AppDir, "test"]))
end, rebar_state:project_apps(State)),
_ = code:add_path(filename:join([rebar_dir:base_dir(State), "test"])),
ok.
reread_config(State) ->
case find_config(State) of
no_config ->
ok;
{ok, ConfigList} ->
lists:foreach(fun ({Application, Items}) ->
lists:foreach(fun ({Key, Val}) ->
application:set_env(Application, Key, Val)
end,
Items)
end,
ConfigList);
{error, Error} ->
?ABORT("Error while attempting to read configuration file: ~p", [Error])
end.
% First try the --config flag, then try the relx sys_config
-spec find_config(rebar_state:t()) -> {ok, [tuple()]}|no_config|{error, tuple()}.
find_config(State) ->
case find_config_option(State) of
no_config ->
find_config_relx(State);
Result ->
Result
end.
-spec find_config_option(rebar_state:t()) -> {ok, [tuple()]}|no_config|{error, tuple()}.
find_config_option(State) ->
{Opts, _} = rebar_state:command_parsed_args(State),
case proplists:get_value(config, Opts) of
undefined ->
no_config;
Filename ->
consult_config(State, Filename)
end.
-spec find_config_relx(rebar_state:t()) -> {ok, [tuple()]}|no_config|{error, tuple()}.
find_config_relx(State) ->
case proplists:get_value(sys_config, rebar_state:get(State, relx, [])) of
undefined ->
no_config;
Filename ->
consult_config(State, Filename)
end.
-spec consult_config(rebar_state:t(), string()) -> {ok, [tuple()]}|{error, tuple()}.
consult_config(State, Filename) ->
Fullpath = filename:join(rebar_dir:root_dir(State), Filename),
?DEBUG("Loading configuration from ~p", [Fullpath]),
case file:consult(Fullpath) of
{ok, [Config]} ->
{ok, Config};
{ok, []} ->
{ok, []};
{error, Error} ->
{error, {Error, Fullpath}}
end.
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