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rebar/src/rebar_utils.erl

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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% Copyright (c) 2009, 2010 Dave Smith (dizzyd@dizzyd.com)
%%
%% 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_utils).
-export([get_cwd/0,
is_arch/1,
get_arch/0,
wordsize/0,
sh/2,
sh_send/3,
find_files/2,
find_files/3,
now_str/0,
ensure_dir/1,
beam_to_mod/2,
beams/1,
erl_to_mod/1,
abort/0,
abort/2,
escript_foldl/3,
find_executable/1,
prop_check/3,
expand_code_path/0,
expand_env_variable/3,
vcs_vsn/3,
deprecated/3,
deprecated/4,
get_deprecated_global/4,
get_deprecated_global/5,
get_experimental_global/3,
get_experimental_local/3,
get_deprecated_list/4,
get_deprecated_list/5,
get_deprecated_local/4,
get_deprecated_local/5,
delayed_halt/1,
erl_opts/1,
src_dirs/1,
ebin_dir/0,
base_dir/1,
processing_base_dir/1,
processing_base_dir/2,
patch_env/2]).
%% for internal use only
-export([otp_release/0]).
-include("rebar.hrl").
%% ====================================================================
%% Public API
%% ====================================================================
get_cwd() ->
{ok, Dir} = file:get_cwd(),
Dir.
is_arch(ArchRegex) ->
case re:run(get_arch(), ArchRegex, [{capture, none}]) of
match ->
true;
nomatch ->
false
end.
get_arch() ->
Words = wordsize(),
otp_release() ++ "-"
++ erlang:system_info(system_architecture) ++ "-" ++ Words.
wordsize() ->
try erlang:system_info({wordsize, external}) of
Val ->
integer_to_list(8 * Val)
catch
error:badarg ->
integer_to_list(8 * erlang:system_info(wordsize))
end.
sh_send(Command0, String, Options0) ->
?INFO("sh_send info:\n\tcwd: ~p\n\tcmd: ~s < ~s\n",
[get_cwd(), Command0, String]),
?DEBUG("\topts: ~p\n", [Options0]),
DefaultOptions = [use_stdout, abort_on_error],
Options = [expand_sh_flag(V)
|| V <- proplists:compact(Options0 ++ DefaultOptions)],
Command = patch_on_windows(Command0, proplists:get_value(env, Options, [])),
PortSettings = proplists:get_all_values(port_settings, Options) ++
[exit_status, {line, 16384}, use_stdio, stderr_to_stdout, hide],
Port = open_port({spawn, Command}, PortSettings),
%% allow us to send some data to the shell command's STDIN
%% Erlang doesn't let us get any reply after sending an EOF, though...
Port ! {self(), {command, String}},
port_close(Port).
%%
%% Options = [Option] -- defaults to [use_stdout, abort_on_error]
%% Option = ErrorOption | OutputOption | {cd, string()} | {env, Env}
%% ErrorOption = return_on_error | abort_on_error | {abort_on_error, string()}
%% OutputOption = use_stdout | {use_stdout, bool()}
%% Env = [{string(), Val}]
%% Val = string() | false
%%
sh(Command0, Options0) ->
?INFO("sh info:\n\tcwd: ~p\n\tcmd: ~s\n", [get_cwd(), Command0]),
?DEBUG("\topts: ~p\n", [Options0]),
DefaultOptions = [use_stdout, abort_on_error],
Options = [expand_sh_flag(V)
|| V <- proplists:compact(Options0 ++ DefaultOptions)],
ErrorHandler = proplists:get_value(error_handler, Options),
OutputHandler = proplists:get_value(output_handler, Options),
Command = patch_on_windows(Command0, proplists:get_value(env, Options, [])),
PortSettings = proplists:get_all_values(port_settings, Options) ++
[exit_status, {line, 16384}, use_stdio, stderr_to_stdout, hide],
?DEBUG("Port Cmd: ~p\nPort Opts: ~p\n", [Command, PortSettings]),
Port = open_port({spawn, Command}, PortSettings),
case sh_loop(Port, OutputHandler, []) of
{ok, _Output} = Ok ->
Ok;
{error, {_Rc, _Output}=Err} ->
ErrorHandler(Command, Err)
end.
find_files(Dir, Regex) ->
find_files(Dir, Regex, true).
find_files(Dir, Regex, Recursive) ->
filelib:fold_files(Dir, Regex, Recursive,
fun(F, Acc) -> [F | Acc] end, []).
now_str() ->
{{Year, Month, Day}, {Hour, Minute, Second}} = calendar:local_time(),
lists:flatten(io_lib:format("~4b/~2..0b/~2..0b ~2..0b:~2..0b:~2..0b",
[Year, Month, Day, Hour, Minute, Second])).
%% TODO: filelib:ensure_dir/1 corrected in R13B04. Remove when we drop
%% support for OTP releases older than R13B04.
ensure_dir(Path) ->
case filelib:ensure_dir(Path) of
ok ->
ok;
{error,eexist} ->
ok;
Error ->
Error
end.
-spec abort() -> no_return().
abort() ->
throw(rebar_abort).
-spec abort(string(), [term()]) -> no_return().
abort(String, Args) ->
?ERROR(String, Args),
abort().
%% TODO: Rename emulate_escript_foldl to escript_foldl and remove
%% this function when the time is right. escript:foldl/3 was an
%% undocumented exported fun and has been removed in R14.
escript_foldl(Fun, Acc, File) ->
{module, zip} = code:ensure_loaded(zip),
case erlang:function_exported(zip, foldl, 3) of
true ->
emulate_escript_foldl(Fun, Acc, File);
false ->
escript:foldl(Fun, Acc, File)
end.
find_executable(Name) ->
case os:find_executable(Name) of
false -> false;
Path ->
"\"" ++ filename:nativename(Path) ++ "\""
end.
%% Helper function for checking values and aborting when needed
prop_check(true, _, _) -> true;
prop_check(false, Msg, Args) -> ?ABORT(Msg, Args).
%% Convert all the entries in the code path to absolute paths.
expand_code_path() ->
CodePath = lists:foldl(fun(Path, Acc) ->
[filename:absname(Path) | Acc]
end, [], code:get_path()),
code:set_path(lists:reverse(CodePath)).
%%
%% Given env. variable FOO we want to expand all references to
%% it in InStr. References can have two forms: $FOO and ${FOO}
%% The end of form $FOO is delimited with whitespace or eol
%%
expand_env_variable(InStr, VarName, RawVarValue) ->
case string:chr(InStr, $$) of
0 ->
%% No variables to expand
InStr;
_ ->
ReOpts = [global, unicode, {return, list}],
VarValue = re:replace(RawVarValue, "\\\\", "\\\\\\\\", ReOpts),
%% Use a regex to match/replace:
%% Given variable "FOO": match $FOO\s | $FOOeol | ${FOO}
RegEx = io_lib:format("\\\$(~s(\\s|$)|{~s})", [VarName, VarName]),
re:replace(InStr, RegEx, [VarValue, "\\2"], ReOpts)
end.
vcs_vsn(Config, Vsn, Dir) ->
Key = {Vsn, Dir},
Cache = rebar_config:get_xconf(Config, vsn_cache),
case dict:find(Key, Cache) of
error ->
VsnString = vcs_vsn_1(Vsn, Dir),
Cache1 = dict:store(Key, VsnString, Cache),
Config1 = rebar_config:set_xconf(Config, vsn_cache, Cache1),
{Config1, VsnString};
{ok, VsnString} ->
{Config, VsnString}
end.
get_deprecated_global(Config, OldOpt, NewOpt, When) ->
get_deprecated_global(Config, OldOpt, NewOpt, undefined, When).
get_deprecated_global(Config, OldOpt, NewOpt, Default, When) ->
get_deprecated_3(fun rebar_config:get_global/3,
Config, OldOpt, NewOpt, Default, When).
get_experimental_global(Config, Opt, Default) ->
get_experimental_3(fun rebar_config:get_global/3, Config, Opt, Default).
get_experimental_local(Config, Opt, Default) ->
get_experimental_3(fun rebar_config:get_local/3, Config, Opt, Default).
get_deprecated_list(Config, OldOpt, NewOpt, When) ->
get_deprecated_list(Config, OldOpt, NewOpt, undefined, When).
get_deprecated_list(Config, OldOpt, NewOpt, Default, When) ->
get_deprecated_3(fun rebar_config:get_list/3,
Config, OldOpt, NewOpt, Default, When).
get_deprecated_local(Config, OldOpt, NewOpt, When) ->
get_deprecated_local(Config, OldOpt, NewOpt, undefined, When).
get_deprecated_local(Config, OldOpt, NewOpt, Default, When) ->
get_deprecated_3(fun rebar_config:get_local/3,
Config, OldOpt, NewOpt, Default, When).
deprecated(Old, New, Opts, When) when is_list(Opts) ->
case lists:member(Old, Opts) of
true ->
deprecated(Old, New, When);
false ->
ok
end;
deprecated(Old, New, Config, When) ->
case rebar_config:get(Config, Old, undefined) of
undefined ->
ok;
_ ->
deprecated(Old, New, When)
end.
deprecated(Old, New, When) ->
io:format(
<<"WARNING: deprecated ~p option used~n"
"Option '~p' has been deprecated~n"
"in favor of '~p'.~n"
"'~p' will be removed ~s.~n~n">>,
[Old, Old, New, Old, When]).
-spec delayed_halt(integer()) -> no_return().
delayed_halt(Code) ->
%% Work around buffer flushing issue in erlang:halt if OTP older
%% than R15B01.
%% TODO: remove workaround once we require R15B01 or newer
%% R15B01 introduced erlang:halt/2
case erlang:is_builtin(erlang, halt, 2) of
true ->
halt(Code);
false ->
case os:type() of
{win32, nt} ->
timer:sleep(100),
halt(Code);
_ ->
halt(Code),
%% workaround to delay exit until all output is written
receive after infinity -> ok end
end
end.
%% @doc Return list of erl_opts
-spec erl_opts(rebar_config:config()) -> list().
erl_opts(Config) ->
RawErlOpts = filter_defines(rebar_config:get(Config, erl_opts, []), []),
Defines = [{d, list_to_atom(D)} ||
D <- rebar_config:get_xconf(Config, defines, [])],
Opts = Defines ++ RawErlOpts,
case proplists:is_defined(no_debug_info, Opts) of
true ->
[O || O <- Opts, O =/= no_debug_info];
false ->
[debug_info|Opts]
end.
-spec src_dirs([string()]) -> [file:filename(), ...].
src_dirs([]) ->
["src"];
src_dirs(SrcDirs) ->
SrcDirs.
ebin_dir() ->
filename:join(get_cwd(), "ebin").
base_dir(Config) ->
rebar_config:get_xconf(Config, base_dir).
processing_base_dir(Config) ->
Cwd = rebar_utils:get_cwd(),
processing_base_dir(Config, Cwd).
processing_base_dir(Config, Dir) ->
AbsDir = filename:absname(Dir),
AbsDir =:= base_dir(Config).
%% @doc Returns the list of environment variables including 'REBAR' which
%% points to the rebar executable used to execute the currently running
%% command. The environment is not modified if rebar was invoked
%% programmatically.
-spec patch_env(rebar_config:config(), [{string(), string()}])
-> [{string(), string()}].
patch_env(Config, []) ->
%% If we reached an empty list, the env did not contain the REBAR variable.
case rebar_config:get_xconf(Config, escript, "") of
"" -> % rebar was invoked programmatically
[];
Path ->
[{"REBAR", Path}]
end;
patch_env(_Config, [{"REBAR", _} | _]=All) ->
All;
patch_env(Config, [E | Rest]) ->
[E | patch_env(Config, Rest)].
%% ====================================================================
%% Internal functions
%% ====================================================================
otp_release() ->
otp_release1(erlang:system_info(otp_release)).
%% If OTP <= R16, otp_release is already what we want.
otp_release1([$R,N|_]=Rel) when is_integer(N) ->
Rel;
%% If OTP >= 17.x, erlang:system_info(otp_release) returns just the
%% major version number, we have to read the full version from
%% a file. See http://www.erlang.org/doc/system_principles/versions.html
otp_release1(Rel) ->
File = filename:join([code:root_dir(), "releases", Rel, "OTP_VERSION"]),
{ok, Vsn} = file:read_file(File),
%% NOTE: It's fine to rely on the binary module here because we
%% can be sure that it's available when the otp_release string
%% does not begin with $R.
%% Return as list without the "\n".
binary:bin_to_list(Vsn, {0, byte_size(Vsn) - 1}).
get_deprecated_3(Get, Config, OldOpt, NewOpt, Default, When) ->
case Get(Config, NewOpt, Default) of
Default ->
case Get(Config, OldOpt, Default) of
Default ->
Default;
Old ->
deprecated(OldOpt, NewOpt, When),
Old
end;
New ->
New
end.
get_experimental_3(Get, Config, Opt, Default) ->
Val = Get(Config, Opt, Default),
case Val of
Default ->
Default;
Val ->
?CONSOLE("NOTICE: Using experimental option '~p'~n", [Opt]),
Val
end.
%% We do the shell variable substitution ourselves on Windows and hope that the
%% command doesn't use any other shell magic.
patch_on_windows(Cmd, Env) ->
case os:type() of
{win32,nt} ->
Cmd1 = "cmd /q /c "
++ lists:foldl(fun({Key, Value}, Acc) ->
expand_env_variable(Acc, Key, Value)
end, Cmd, Env),
%% Remove left-over vars
re:replace(Cmd1, "\\\$\\w+|\\\${\\w+}", "",
[global, {return, list}]);
_ ->
Cmd
end.
expand_sh_flag(return_on_error) ->
{error_handler,
fun(_Command, Err) ->
{error, Err}
end};
expand_sh_flag({abort_on_error, Message}) ->
{error_handler,
log_msg_and_abort(Message)};
expand_sh_flag(abort_on_error) ->
{error_handler,
fun log_and_abort/2};
expand_sh_flag(use_stdout) ->
{output_handler,
fun(Line, Acc) ->
?CONSOLE("~s", [Line]),
[Line | Acc]
end};
expand_sh_flag({use_stdout, false}) ->
{output_handler,
fun(Line, Acc) ->
[Line | Acc]
end};
expand_sh_flag({cd, _CdArg} = Cd) ->
{port_settings, Cd};
expand_sh_flag({env, _EnvArg} = Env) ->
{port_settings, Env}.
-type err_handler() :: fun((string(), {integer(), string()}) -> no_return()).
-spec log_msg_and_abort(string()) -> err_handler().
log_msg_and_abort(Message) ->
fun(_Command, {_Rc, _Output}) ->
?ABORT(Message, [])
end.
-spec log_and_abort(string(), {integer(), string()}) -> no_return().
log_and_abort(Command, {Rc, Output}) ->
?ABORT("sh(~s)~n"
"failed with return code ~w and the following output:~n"
"~s~n", [Command, Rc, Output]).
sh_loop(Port, Fun, Acc) ->
receive
{Port, {data, {eol, Line}}} ->
sh_loop(Port, Fun, Fun(Line ++ "\n", Acc));
{Port, {data, {noeol, Line}}} ->
sh_loop(Port, Fun, Fun(Line, Acc));
{Port, {exit_status, 0}} ->
{ok, lists:flatten(lists:reverse(Acc))};
{Port, {exit_status, Rc}} ->
{error, {Rc, lists:flatten(lists:reverse(Acc))}}
end.
beam_to_mod(Dir, Filename) ->
[Dir | Rest] = filename:split(Filename),
list_to_atom(filename:basename(string:join(Rest, "."), ".beam")).
erl_to_mod(Filename) ->
list_to_atom(filename:rootname(filename:basename(Filename))).
beams(Dir) ->
filelib:fold_files(Dir, ".*\.beam\$", true,
fun(F, Acc) -> [F | Acc] end, []).
emulate_escript_foldl(Fun, Acc, File) ->
case escript:extract(File, [compile_source]) of
{ok, [_Shebang, _Comment, _EmuArgs, Body]} ->
case Body of
{source, BeamCode} ->
GetInfo = fun() -> file:read_file_info(File) end,
GetBin = fun() -> BeamCode end,
{ok, Fun(".", GetInfo, GetBin, Acc)};
{beam, BeamCode} ->
GetInfo = fun() -> file:read_file_info(File) end,
GetBin = fun() -> BeamCode end,
{ok, Fun(".", GetInfo, GetBin, Acc)};
{archive, ArchiveBin} ->
zip:foldl(Fun, Acc, {File, ArchiveBin})
end;
{error, _} = Error ->
Error
end.
vcs_vsn_1(Vcs, Dir) ->
case vcs_vsn_cmd(Vcs) of
{plain, VsnString} ->
VsnString;
{cmd, CmdString} ->
vcs_vsn_invoke(CmdString, Dir);
unknown ->
?ABORT("vcs_vsn: Unknown vsn format: ~p\n", [Vcs]);
Cmd ->
%% If there is a valid VCS directory in the application directory,
%% use that version info
Extension = lists:concat([".", Vcs]),
case filelib:is_dir(filename:join(Dir, Extension)) of
true ->
?DEBUG("vcs_vsn: Primary vcs used for ~s\n", [Dir]),
vcs_vsn_invoke(Cmd, Dir);
false ->
%% No VCS directory found for the app. Depending on source
%% tree structure, there may be one higher up, but that can
%% yield unexpected results when used with deps. So, we
%% fallback to searching for a priv/vsn.Vcs file.
VsnFile = filename:join([Dir, "priv", "vsn" ++ Extension]),
case file:read_file(VsnFile) of
{ok, VsnBin} ->
?DEBUG("vcs_vsn: Read ~s from priv/vsn.~p\n",
[VsnBin, Vcs]),
string:strip(binary_to_list(VsnBin), right, $\n);
{error, enoent} ->
?DEBUG("vcs_vsn: Fallback to vcs for ~s\n", [Dir]),
vcs_vsn_invoke(Cmd, Dir)
end
end
end.
vcs_vsn_cmd(git) -> "git describe --always --tags";
vcs_vsn_cmd(p4) -> "echo #head";
vcs_vsn_cmd(hg) -> "hg identify -i";
vcs_vsn_cmd(bzr) -> "bzr revno";
vcs_vsn_cmd(svn) -> "svnversion";
vcs_vsn_cmd(fossil) -> "fossil info";
vcs_vsn_cmd({cmd, _Cmd}=Custom) -> Custom;
vcs_vsn_cmd(Version) when is_list(Version) -> {plain, Version};
vcs_vsn_cmd(_) -> unknown.
vcs_vsn_invoke(Cmd, Dir) ->
{ok, VsnString} = rebar_utils:sh(Cmd, [{cd, Dir}, {use_stdout, false}]),
string:strip(VsnString, right, $\n).
%%
%% Filter a list of erl_opts platform_define options such that only
%% those which match the provided architecture regex are returned.
%%
filter_defines([], Acc) ->
lists:reverse(Acc);
filter_defines([{platform_define, ArchRegex, Key} | Rest], Acc) ->
case rebar_utils:is_arch(ArchRegex) of
true ->
filter_defines(Rest, [{d, Key} | Acc]);
false ->
filter_defines(Rest, Acc)
end;
filter_defines([{platform_define, ArchRegex, Key, Value} | Rest], Acc) ->
case rebar_utils:is_arch(ArchRegex) of
true ->
filter_defines(Rest, [{d, Key, Value} | Acc]);
false ->
filter_defines(Rest, Acc)
end;
filter_defines([Opt | Rest], Acc) ->
filter_defines(Rest, [Opt | Acc]).
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