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%%% Mock a package resource and create an app magically for each URL submitted.
-module(mock_pkg_resource).
-export([mock/0, mock/1, unmock/0]).
-define(MOD, rebar_pkg_resource).
%%%%%%%%%%%%%%%%%
%%% Interface %%%
%%%%%%%%%%%%%%%%%
%% @doc same as `mock([])'.
mock() -> mock([]).
%% @doc Mocks a fake version of the git resource fetcher that creates
%% empty applications magically, rather than trying to download them.
%% Specific config options are explained in each of the private functions.
-spec mock(Opts) -> ok when
Opts :: [Option],
Option :: {update, [App]}
| {default_vsn, Vsn}
| {override_vsn, [{App, Vsn}]}
| {not_in_index, [{App, Vsn}]}
| {pkgdeps, [{{App,Vsn}, [Dep]}]},
App :: string(),
Dep :: {App, string(), {pkg, App, Vsn}},
Vsn :: string().
mock(Opts) ->
meck:new(?MOD, [no_link]),
mock_lock(Opts),
mock_update(Opts),
mock_vsn(Opts),
mock_download(Opts),
mock_pkg_index(Opts),
ok.
unmock() ->
meck:unload(?MOD),
meck:unload(rebar_packages).
%%%%%%%%%%%%%%%
%%% Private %%%
%%%%%%%%%%%%%%%
%% @doc creates values for a lock file.
mock_lock(_) ->
meck:expect(?MOD, lock, fun(_AppDir, Source) -> Source end).
%% @doc The config passed to the `mock/2' function can specify which apps
%% should be updated on a per-name basis: `{update, ["App1", "App3"]}'.
mock_update(Opts) ->
ToUpdate = proplists:get_value(upgrade, Opts, []),
meck:expect(
?MOD, needs_update,
fun(_Dir, {pkg, App, _Vsn}) ->
lists:member(binary_to_list(App), ToUpdate)
end).
%% @doc Replicated an unsupported call.
mock_vsn(_Opts) ->
meck:expect(
?MOD, make_vsn,
fun(_Dir) ->
{error, "Replacing version of type pkg not supported."}
end).
%% @doc For each app to download, create a dummy app on disk instead.
%% The configuration for this one (passed in from `mock/1') includes:
%%
%% - Specify a version with `{pkg, _, Vsn}'
%% - Dependencies for each application must be passed of the form:
%% `{pkgdeps, [{"app1", [{app2, ".*", {pkg, ...}}]}]}' -- basically
%% the `pkgdeps' option takes a key/value list of terms to output directly
%% into a `rebar.config' file to describe dependencies.
mock_download(Opts) ->
Deps = proplists:get_value(pkgdeps, Opts, []),
meck:expect(
?MOD, download,
fun (Dir, {pkg, AppBin, Vsn}, _) ->
App = binary_to_list(AppBin),
filelib:ensure_dir(Dir),
AppDeps = proplists:get_value({App,Vsn}, Deps, []),
{ok, AppInfo} = rebar_test_utils:create_empty_app(
Dir, App, Vsn,
[element(1,D) || D <- AppDeps]
),
rebar_test_utils:create_config(Dir, [{deps, AppDeps}]),
Tarball = filename:join([Dir, App++"-"++binary_to_list(Vsn)++".tar"]),
Contents = filename:join([Dir, "contents.tar.gz"]),
Files = all_files(rebar_app_info:dir(AppInfo)),
ok = erl_tar:create(Contents,
archive_names(Dir, App, Vsn, Files),
[compressed]),
ok = erl_tar:create(Tarball,
[{"contents.tar.gz", Contents}],
[]),
[file:delete(F) || F <- Files],
{tarball, Tarball}
end).
%% @doc On top of the pkg resource mocking, we need to mock the package
%% index.
%%
%% A special option, `{not_in_index, [App]}' lets the index leave out
%% specific applications otherwise listed.
mock_pkg_index(Opts) ->
Deps = proplists:get_value(pkgdeps, Opts, []),
Skip = proplists:get_value(not_in_index, Opts, []),
%% Dict: {App, Vsn}: [{<<"link">>, <<>>}, {<<"deps">>, []}]
%% Digraph: all apps and deps in the index
Dict = find_parts(Deps, Skip),
GraphParts = to_graph_parts(Dict),
Digraph = rebar_digraph:restore_graph(GraphParts),
meck:new(rebar_packages, [passthrough, no_link]),
meck:expect(rebar_packages, get_packages,
fun(_State) -> {Dict, Digraph} end).
%%%%%%%%%%%%%%%
%%% Helpers %%%
%%%%%%%%%%%%%%%
all_files(Dir) ->
filelib:wildcard(filename:join([Dir, "**"])).
archive_names(Dir, App, Vsn, Files) ->
[{(F -- Dir) -- "/", F} || F <- Files].
find_parts(Apps, Skip) -> find_parts(Apps, Skip, dict:new()).
find_parts([], _, Acc) -> Acc;
find_parts([{AppName, Deps}|Rest], Skip, Acc) ->
case lists:member(AppName, Skip) orelse dict:is_key(AppName,Acc) of
true -> find_parts(Rest, Skip, Acc);
false ->
AccNew = dict:store(AppName,
[{<<"deps">>,Deps}, {<<"link">>,<<"undef">>}],
Acc),
find_parts(Rest, Skip, AccNew)
end.
to_graph_parts(Dict) ->
LastUpdated = now(),
dict:fold(fun(K,V,{Ks,Vs}) ->
{_,Deps} = lists:keyfind(<<"deps">>, 1, V),
{[{K,LastUpdated}|Ks],
[{K,{list_to_binary(atom_to_list(DK)), list_to_binary(DV)}}
|| {DK,DV} <- Deps] ++ Vs}
end, {[],[]}, Dict).
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