%% -*- erlang-indent-level: 4; indent-tabs-mode: nil; fill-column: 80 -*-
%%% 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_rel_discovery).
-export([do/3,
format_error/1]).
-include_lib("relcool/include/relcool.hrl").
%%============================================================================
%% API
%%============================================================================
%% @doc recursively dig down into the library directories specified in the state
%% looking for OTP Applications
-spec do(rcl_state:t(), [filename:name()], [rcl_app_info:t()]) ->
{ok, [rcl_release:t()]} | relcool:error().
do(State, LibDirs, AppMeta) ->
rcl_log:info(rcl_state:log(State),
fun() ->
["Resolving available releases from directories:\n",
[[rcl_util:indent(1), LibDir, "\n"] || LibDir <- LibDirs]]
end),
resolve_rel_metadata(State, LibDirs, AppMeta).
-spec format_error([ErrorDetail::term()]) -> iolist().
format_error(ErrorDetails)
when erlang:is_list(ErrorDetails) ->
[[format_detail(ErrorDetail), "\n"] || ErrorDetail <- ErrorDetails].
%%%===================================================================
%%% Internal Functions
%%%===================================================================
resolve_rel_metadata(State, LibDirs, AppMeta) ->
ReleaseMeta0 = lists:flatten(rcl_dscv_util:do(fun(LibDir, FileType) ->
discover_dir(LibDir,
AppMeta,
FileType)
end, LibDirs)),
Errors = [case El of
{error, Ret} -> Ret;
_ -> El
end
|| El <- ReleaseMeta0,
case El of
{error, _} ->
true;
_ ->
false
end],
case Errors of
[] ->
rcl_log:debug(rcl_state:log(State),
fun() ->
["Resolved the following OTP Releases from the system: \n",
[[rcl_release:format(1, Rel), "\n"] || Rel <- ReleaseMeta0]]
end),
{ok, ReleaseMeta0};
_ ->
?RCL_ERROR(Errors)
end.
-spec format_detail(ErrorDetail::term()) -> iolist().
format_detail({accessing, File, eaccess}) ->
io_lib:format("permission denied accessing file ~s", [File]);
format_detail({accessing, File, Type}) ->
io_lib:format("error (~p) accessing file ~s", [Type, File]).
-spec discover_dir(file:name(), [rcl_app_info:t()], directory | file) ->
{ok, rcl_release:t()}
| {error, Reason::term()}
| {noresult, false}.
discover_dir(_File, _AppMeta, directory) ->
{noresult, true};
discover_dir(File, AppMeta, file) ->
is_valid_release(File, AppMeta).
-spec is_valid_release(file:name(),
[rcl_app_info:t()]) ->
{ok, rcl_release:t()}
| {error, Reason::term()}
| {noresult, false}.
is_valid_release(File, AppMeta) ->
case lists:suffix(".rel", File) of
true ->
resolve_release(File, AppMeta);
false ->
{noresult, false}
end.
resolve_release(RelFile, AppMeta) ->
case file:consult(RelFile) of
{ok, [{release, {RelName, RelVsn},
{erts, ErtsVsn},
Apps}]} ->
build_release(RelName, RelVsn, ErtsVsn, Apps, AppMeta);
{ok, InvalidRelease} ->
?RCL_ERROR({invalid_release_information, InvalidRelease});
{error, Reason} ->
?RCL_ERROR({unable_to_read, RelFile, Reason})
end.
build_release(RelName, RelVsn, ErtsVsn, Apps, AppMeta) ->
Release = rcl_release:erts(rcl_release:new(RelName, RelVsn),
ErtsVsn),
resolve_apps(Apps, AppMeta, Release, []).
resolve_apps([], _AppMeta, Release, Acc) ->
{ok, rcl_release:application_details(Release, Acc)};
resolve_apps([AppInfo | Apps], AppMeta, Release, Acc) ->
AppName = erlang:element(1, AppInfo),
AppVsn = ec_semver:parse(erlang:element(2, AppInfo)),
case find_app(AppName, AppVsn, AppMeta) of
Error = {error, _} ->
Error;
ResolvedApp ->
resolve_apps(Apps, AppMeta, Release, [ResolvedApp | Acc])
end.
find_app(AppName, AppVsn, AppMeta) ->
case ec_lists:find(fun(App) ->
NAppName = rcl_app_info:name(App),
NAppVsn = rcl_app_info:vsn(App),
AppName == NAppName andalso
AppVsn == NAppVsn
end, AppMeta) of
{ok, Head} ->
Head;
error ->
?RCL_ERROR({could_not_find, {AppName, AppVsn}})
end.
