%% -*- mode: Erlang; fill-column: 80; comment-column: 75; -*-
%%% Copyright 2012 Erlware, LLC. All Rights Reserved.
%%%
%%% This file is provided to you under the Apache License,
%%% Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing,
%%% software distributed under the License is distributed on an
%%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%%% KIND, either express or implied. See the License for the
%%% specific language governing permissions and limitations
%%% under the License.
%%%---------------------------------------------------------------------------
%%% @author Eric Merritt <[email protected]>
%%% @copyright (C) 2012 Erlware, LLC.
%%%
%%% @doc This provider uses the lib_dir setting of the state. It searches the
%%% Lib Dirs looking for all OTP Applications that are available. When it finds
%%% those OTP Applications it loads the information about them and adds them to
%%% the state of available apps. This implements the rcl_provider behaviour.
-module(rcl_prv_release).
-behaviour(rcl_provider).
-export([init/1,
do/1,
format_error/1]).
-include_lib("relcool/include/relcool.hrl").
%%============================================================================
%% API
%%============================================================================
-spec init(rcl_state:t()) -> {ok, rcl_state:t()}.
init(State) ->
{ok, State}.
%% @doc recursively dig down into the library directories specified in the state
%% looking for OTP Applications
-spec do(rcl_state:t()) -> {ok, rcl_state:t()} | relcool:error().
do(State) ->
DepGraph = create_dep_graph(State),
find_default_release(State, DepGraph).
-spec format_error(ErrorDetail::term()) -> iolist().
format_error(no_goals_specified) ->
"No goals specified for this release ~n";
format_error({no_release_name, Vsn}) ->
io_lib:format("A target release version was specified (~s) but no name", [Vsn]);
format_error({invalid_release_info, Info}) ->
io_lib:format("Target release information is in an invalid format ~p", [Info]);
format_error({multiple_release_names, RelA, RelB}) ->
io_lib:format("No default release name was specified and there are multiple "
"releases in the config: ~s, ~s",
[RelA, RelB]);
format_error(no_releases_in_system) ->
"No releases have been specified in the system!";
format_error({no_releases_for, RelName}) ->
io_lib:format("No releases exist in the system for ~s!", [RelName]);
format_error({release_not_found, {RelName, RelVsn}}) ->
io_lib:format("No releases exist in the system for ~p:~s!", [RelName, RelVsn]);
format_error({failed_solve, Error}) ->
io_lib:format("Failed to solve release:\n ~s",
[rcl_depsolver:format_error({error, Error})]).
%%%===================================================================
%%% Internal Functions
%%%===================================================================
-spec create_dep_graph(rcl_state:t()) -> rcl_depsolver:t().
create_dep_graph(State) ->
Apps = rcl_state:available_apps(State),
Graph0 = rcl_depsolver:new_graph(),
lists:foldl(fun(App, Graph1) ->
AppName = rcl_app_info:name(App),
AppVsn = rcl_app_info:vsn(App),
Deps = rcl_app_info:active_deps(App) ++
rcl_app_info:library_deps(App),
rcl_depsolver:add_package_version(Graph1,
AppName,
AppVsn,
Deps)
end, Graph0, Apps).
-spec find_default_release(rcl_state:t(), rcl_depsolver:t()) ->
{ok, rcl_state:t()} | relcool:error().
find_default_release(State, DepGraph) ->
case rcl_state:default_release(State) of
{undefined, undefined} ->
resolve_default_release(State, DepGraph);
{RelName, undefined} ->
resolve_default_version(State, DepGraph, RelName);
{undefined, Vsn} ->
?RCL_ERROR({no_release_name, Vsn});
{RelName, RelVsn} ->
solve_release(State, DepGraph, RelName, RelVsn)
end.
resolve_default_release(State0, DepGraph) ->
%% Here we will just get the lastest version and run that.
case lists:sort(fun release_sort/2,
ec_dictionary:to_list(rcl_state:releases(State0))) of
All = [{{RelName, RelVsn}, _} | _] ->
State1 = rcl_state:default_release(State0, RelName, RelVsn),
lists:foldl(fun({{RN, RV}, _}, {ok, State2}) ->
solve_release(State2,
DepGraph, RN, RV);
(_, E) ->
E
end, {ok, State1}, All);
[] ->
?RCL_ERROR(no_releases_in_system)
end.
resolve_default_version(State0, DepGraph, RelName) ->
%% Here we will just get the lastest version and run that.
AllReleases = ec_dictionary:to_list(rcl_state:releases(State0)),
SpecificReleases = [Rel || Rel={{PossibleRelName, _}, _} <- AllReleases,
PossibleRelName =:= RelName],
case lists:sort(fun release_sort/2, SpecificReleases) of
All = [{{RelName, RelVsn}, _} | _] ->
State1 = rcl_state:default_release(State0, RelName, RelVsn),
lists:foldl(fun({RN, RV}, {ok, State2}) ->
solve_release(State2,
DepGraph, RN, RV);
(_, E) ->
E
end, {ok, State1}, All);
[] ->
?RCL_ERROR({no_releases_for, RelName})
end.
-spec release_sort({{rcl_release:name(),rcl_release:vsn()}, term()},
{{rcl_release:name(),rcl_release:vsn()}, term()}) ->
boolean().
release_sort({{RelName, RelVsnA}, _},
{{RelName, RelVsnB}, _}) ->
ec_semver:lte(RelVsnA, RelVsnB);
release_sort({{RelNameA, RelVsnA}, _}, {{RelNameB, RelVsnB}, _}) ->
%% The release names are different. When the releases are named differently
%% we can not just take the lastest version. You *must* provide a default
%% release name at least. So we throw an error here that the top can catch
%% and return
erlang:atom_to_list(RelNameA) =< erlang:atom_to_list(RelNameB) andalso
ec_semver:lte(RelVsnA, RelVsnB).
solve_release(State0, DepGraph, RelName, RelVsn) ->
try
Release = rcl_state:get_release(State0, RelName, RelVsn),
Goals = rcl_release:goals(Release),
case Goals of
[] ->
?RCL_ERROR(no_goals_specified);
_ ->
case rcl_depsolver:solve(DepGraph, Goals) of
{ok, Pkgs} ->
set_resolved(State0, Release, Pkgs);
{error, Error} ->
?RCL_ERROR({failed_solve, Error})
end
end
catch
throw:not_found ->
?RCL_ERROR({release_not_found, RelName, RelVsn})
end.
set_resolved(State, Release0, Pkgs) ->
case rcl_release:realize(Release0, Pkgs, rcl_state:available_apps(State)) of
{ok, Release1} ->
rcl_log:info(rcl_state:log(State),
"Resolved ~p-~s~n",
[rcl_release:name(Release1),
rcl_release:vsn(Release1)]),
rcl_log:info(rcl_state:log(State),
fun() ->
rcl_release:format(1, Release1)
end),
{ok, rcl_state:update_release(State, Release1)};
{error, E} ->
?RCL_ERROR({release_error, E})
end.
%%%===================================================================
%%% Test Functions
%%%===================================================================
-ifndef(NOTEST).
-include_lib("eunit/include/eunit.hrl").
-endif.
