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+%% @author Bob Ippolito <bob@mochimedia.com>
+%% @copyright 2010 Mochi Media, Inc.
+
+%% @doc Create temporary files and directories. Requires crypto to be started.
+
+-module(mochitemp).
+-export([gettempdir/0]).
+-export([mkdtemp/0, mkdtemp/3]).
+-export([rmtempdir/1]).
+%% -export([mkstemp/4]).
+-define(SAFE_CHARS, {$a, $b, $c, $d, $e, $f, $g, $h, $i, $j, $k, $l, $m,
+ $n, $o, $p, $q, $r, $s, $t, $u, $v, $w, $x, $y, $z,
+ $A, $B, $C, $D, $E, $F, $G, $H, $I, $J, $K, $L, $M,
+ $N, $O, $P, $Q, $R, $S, $T, $U, $V, $W, $X, $Y, $Z,
+ $0, $1, $2, $3, $4, $5, $6, $7, $8, $9, $_}).
+-define(TMP_MAX, 10000).
+
+-include_lib("kernel/include/file.hrl").
+
+%% TODO: An ugly wrapper over the mktemp tool with open_port and sadness?
+%% We can't implement this race-free in Erlang without the ability
+%% to issue O_CREAT|O_EXCL. I suppose we could hack something with
+%% mkdtemp, del_dir, open.
+%% mkstemp(Suffix, Prefix, Dir, Options) ->
+%% ok.
+
+rmtempdir(Dir) ->
+ case file:del_dir(Dir) of
+ {error, eexist} ->
+ ok = rmtempdirfiles(Dir),
+ ok = file:del_dir(Dir);
+ ok ->
+ ok
+ end.
+
+rmtempdirfiles(Dir) ->
+ {ok, Files} = file:list_dir(Dir),
+ ok = rmtempdirfiles(Dir, Files).
+
+rmtempdirfiles(_Dir, []) ->
+ ok;
+rmtempdirfiles(Dir, [Basename | Rest]) ->
+ Path = filename:join([Dir, Basename]),
+ case filelib:is_dir(Path) of
+ true ->
+ ok = rmtempdir(Path);
+ false ->
+ ok = file:delete(Path)
+ end,
+ rmtempdirfiles(Dir, Rest).
+
+mkdtemp() ->
+ mkdtemp("", "tmp", gettempdir()).
+
+mkdtemp(Suffix, Prefix, Dir) ->
+ mkdtemp_n(rngpath_fun(Suffix, Prefix, Dir), ?TMP_MAX).
+
+
+
+mkdtemp_n(RngPath, 1) ->
+ make_dir(RngPath());
+mkdtemp_n(RngPath, N) ->
+ try make_dir(RngPath())
+ catch throw:{error, eexist} ->
+ mkdtemp_n(RngPath, N - 1)
+ end.
+
+make_dir(Path) ->
+ case file:make_dir(Path) of
+ ok ->
+ ok;
+ E={error, eexist} ->
+ throw(E)
+ end,
+ %% Small window for a race condition here because dir is created 777
+ ok = file:write_file_info(Path, #file_info{mode=8#0700}),
+ Path.
+
+rngpath_fun(Prefix, Suffix, Dir) ->
+ fun () ->
+ filename:join([Dir, Prefix ++ rngchars(6) ++ Suffix])
+ end.
+
+rngchars(0) ->
+ "";
+rngchars(N) ->
+ [rngchar() | rngchars(N - 1)].
+
+rngchar() ->
+ rngchar(crypto:rand_uniform(0, tuple_size(?SAFE_CHARS))).
+
+rngchar(C) ->
+ element(1 + C, ?SAFE_CHARS).
+
+%% @spec gettempdir() -> string()
+%% @doc Get a usable temporary directory using the first of these that is a directory:
+%% $TMPDIR, $TMP, $TEMP, "/tmp", "/var/tmp", "/usr/tmp", ".".
+gettempdir() ->
+ gettempdir(gettempdir_checks(), fun normalize_dir/1).
+
+gettempdir_checks() ->
+ [{fun os:getenv/1, ["TMPDIR", "TMP", "TEMP"]},
+ {fun gettempdir_identity/1, ["/tmp", "/var/tmp", "/usr/tmp"]},
+ {fun gettempdir_cwd/1, [cwd]}].
+
+gettempdir_identity(L) ->
+ L.
+
+gettempdir_cwd(cwd) ->
+ {ok, L} = file:get_cwd(),
+ L.
+
+gettempdir([{_F, []} | RestF], Normalize) ->
+ gettempdir(RestF, Normalize);
+gettempdir([{F, [L | RestL]} | RestF], Normalize) ->
+ case Normalize(F(L)) of
+ false ->
+ gettempdir([{F, RestL} | RestF], Normalize);
+ Dir ->
+ Dir
+ end.
+
+normalize_dir(False) when False =:= false orelse False =:= "" ->
+ %% Erlang doesn't have an unsetenv, wtf.
+ false;
+normalize_dir(L) ->
+ Dir = filename:absname(L),
+ case filelib:is_dir(Dir) of
+ false ->
+ false;
+ true ->
+ Dir
+ end.
+
+%%
+%% Tests
+%%
+-include_lib("eunit/include/eunit.hrl").
+-ifdef(TEST).
+pushenv(L) ->
+ [{K, os:getenv(K)} || K <- L].
+popenv(L) ->
+ F = fun ({K, false}) ->
+ %% Erlang doesn't have an unsetenv, wtf.
+ os:putenv(K, "");
+ ({K, V}) ->
+ os:putenv(K, V)
+ end,
+ lists:foreach(F, L).
+
+gettempdir_fallback_test() ->
+ ?assertEqual(
+ "/",
+ gettempdir([{fun gettempdir_identity/1, ["/--not-here--/"]},
+ {fun gettempdir_identity/1, ["/"]}],
+ fun normalize_dir/1)),
+ ?assertEqual(
+ "/",
+ %% simulate a true os:getenv unset env
+ gettempdir([{fun gettempdir_identity/1, [false]},
+ {fun gettempdir_identity/1, ["/"]}],
+ fun normalize_dir/1)),
+ ok.
+
+gettempdir_identity_test() ->
+ ?assertEqual(
+ "/",
+ gettempdir([{fun gettempdir_identity/1, ["/"]}], fun normalize_dir/1)),
+ ok.
+
+gettempdir_cwd_test() ->
+ {ok, Cwd} = file:get_cwd(),
+ ?assertEqual(
+ normalize_dir(Cwd),
+ gettempdir([{fun gettempdir_cwd/1, [cwd]}], fun normalize_dir/1)),
+ ok.
+
+rngchars_test() ->
+ crypto:start(),
+ ?assertEqual(
+ "",
+ rngchars(0)),
+ ?assertEqual(
+ 10,
+ length(rngchars(10))),
+ ok.
+
+rngchar_test() ->
+ ?assertEqual(
+ $a,
+ rngchar(0)),
+ ?assertEqual(
+ $A,
+ rngchar(26)),
+ ?assertEqual(
+ $_,
+ rngchar(62)),
+ ok.
+
+mkdtemp_n_failonce_test() ->
+ crypto:start(),
+ D = mkdtemp(),
+ Path = filename:join([D, "testdir"]),
+ %% Toggle the existence of a dir so that it fails
+ %% the first time and succeeds the second.
+ F = fun () ->
+ case filelib:is_dir(Path) of
+ true ->
+ file:del_dir(Path);
+ false ->
+ file:make_dir(Path)
+ end,
+ Path
+ end,
+ try
+ %% Fails the first time
+ ?assertThrow(
+ {error, eexist},
+ mkdtemp_n(F, 1)),
+ %% Reset state
+ file:del_dir(Path),
+ %% Succeeds the second time
+ ?assertEqual(
+ Path,
+ mkdtemp_n(F, 2))
+ after rmtempdir(D)
+ end,
+ ok.
+
+mkdtemp_n_fail_test() ->
+ {ok, Cwd} = file:get_cwd(),
+ ?assertThrow(
+ {error, eexist},
+ mkdtemp_n(fun () -> Cwd end, 1)),
+ ?assertThrow(
+ {error, eexist},
+ mkdtemp_n(fun () -> Cwd end, 2)),
+ ok.
+
+make_dir_fail_test() ->
+ {ok, Cwd} = file:get_cwd(),
+ ?assertThrow(
+ {error, eexist},
+ make_dir(Cwd)),
+ ok.
+
+mkdtemp_test() ->
+ crypto:start(),
+ D = mkdtemp(),
+ ?assertEqual(
+ true,
+ filelib:is_dir(D)),
+ ?assertEqual(
+ ok,
+ file:del_dir(D)),
+ ok.
+
+rmtempdir_test() ->
+ crypto:start(),
+ D1 = mkdtemp(),
+ ?assertEqual(
+ true,
+ filelib:is_dir(D1)),
+ ?assertEqual(
+ ok,
+ rmtempdir(D1)),
+ D2 = mkdtemp(),
+ ?assertEqual(
+ true,
+ filelib:is_dir(D2)),
+ ok = file:write_file(filename:join([D2, "foo"]), <<"bytes">>),
+ D3 = mkdtemp("suffix", "prefix", D2),
+ ?assertEqual(
+ true,
+ filelib:is_dir(D3)),
+ ok = file:write_file(filename:join([D3, "foo"]), <<"bytes">>),
+ ?assertEqual(
+ ok,
+ rmtempdir(D2)),
+ ?assertEqual(
+ {error, enoent},
+ file:consult(D3)),
+ ?assertEqual(
+ {error, enoent},
+ file:consult(D2)),
+ ok.
+
+gettempdir_env_test() ->
+ Env = pushenv(["TMPDIR", "TEMP", "TMP"]),
+ FalseEnv = [{"TMPDIR", false}, {"TEMP", false}, {"TMP", false}],
+ try
+ popenv(FalseEnv),
+ popenv([{"TMPDIR", "/"}]),
+ ?assertEqual(
+ "/",
+ os:getenv("TMPDIR")),
+ ?assertEqual(
+ "/",
+ gettempdir()),
+ {ok, Cwd} = file:get_cwd(),
+ popenv(FalseEnv),
+ popenv([{"TMP", Cwd}]),
+ ?assertEqual(
+ normalize_dir(Cwd),
+ gettempdir())
+ after popenv(Env)
+ end,
+ ok.
+
+-endif.
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