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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% -------------------------------------------------------------------
-module(rebar_fetch).
-export([lock_source/2,
download_source/2,
needs_update/2]).
-include("rebar.hrl").
%% map short versions of resources to module names
-define(RESOURCES, [{git, rebar_git_resource}, {pkg, rebar_pkg_resource}]).
-spec lock_source(file:filename_all(), rebar_resource:resource()) ->
rebar_resource:resource() | {error, string()}.
lock_source(AppDir, Source) ->
case get_resource_type(Source) of
{error, _}=Error ->
Error;
Module ->
Module:lock(AppDir, Source)
end.
-spec download_source(file:filename_all(), rebar_resource:resource()) -> true | {error, any()}.
download_source(AppDir, Source) ->
case get_resource_type(Source) of
{error, _}=Error ->
Error;
Module ->
TmpDir = ec_file:insecure_mkdtemp(),
AppDir1 = ec_cnv:to_list(AppDir),
ec_file:mkdir_p(AppDir1),
case Module:download(TmpDir, Source) of
{ok, _} ->
code:del_path(filename:absname(filename:join(AppDir1, "ebin"))),
ec_file:remove(filename:absname(AppDir1), [recursive]),
ok = ec_file:copy(TmpDir, filename:absname(AppDir1), [recursive]),
true;
{tarball, File} ->
ok = erl_tar:extract(File, [{cwd, TmpDir}
,compressed]),
BaseName = filename:basename(AppDir1),
[FromDir] = filelib:wildcard(filename:join(TmpDir, BaseName++"-*")),
code:del_path(filename:absname(filename:join(AppDir1, "ebin"))),
ec_file:remove(filename:absname(AppDir1), [recursive]),
ok = ec_file:copy(FromDir, filename:absname(AppDir1), [recursive]),
true
end
end.
-spec needs_update(file:filename_all(), rebar_resource:resource()) -> boolean() | {error, string()}.
needs_update(AppDir, Source) ->
case get_resource_type(Source) of
{error, _}=Error ->
Error;
Module ->
Module:needs_update(AppDir, Source)
end.
get_resource_type({Type, Location, _}) ->
find_resource_module(Type, Location);
get_resource_type({Type, _, _, Location}) ->
find_resource_module(Type, Location);
get_resource_type(_) ->
rebar_pkg_resource.
find_resource_module(Type, Location) ->
case lists:keyfind(Type, 1, ?RESOURCES) of
false ->
case code:which(Type) of
non_existing ->
{error, io_lib:format("Cannot handle dependency ~s.~n"
" No module for resource type ~p", [Location, Type])};
_ ->
Type
end;
{Type, Module} ->
Module
end.
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