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%% Copyright (c) 2010-2011, Michael Santos <michael.santos@gmail.com>
%% All rights reserved.
%%
%% Redistribution and use in source and binary forms, with or without
%% modification, are permitted provided that the following conditions
%% are met:
%%
%% Redistributions of source code must retain the above copyright
%% notice, this list of conditions and the following disclaimer.
%%
%% Redistributions in binary form must reproduce the above copyright
%% notice, this list of conditions and the following disclaimer in the
%% documentation and/or other materials provided with the distribution.
%%
%% Neither the name of the author nor the names of its contributors
%% may be used to endorse or promote products derived from this software
%% without specific prior written permission.
%%
%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
%% "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
%% LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
%% FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
%% COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
%% INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
%% BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
%% LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
%% CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
%% LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
%% ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
%% POSSIBILITY OF SUCH DAMAGE.
%% Atomically create a temporary file.
%%
%% This module just creates a directory, put whatever temp files
%% you need inside the directory.
%%
-module(procket_mktmp).
-export([dirname/0,name/1,template/2,make_dir/1,close/1]).
-include_lib("kernel/include/file.hrl").
-define(TEMPLATE, "erlang-XXXXXXXXXXXX").
-define(S_IRWXU, 8#00400 bor 8#00200 bor 8#00100).
-define(ALPHANUM, "0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz").
dirname() ->
TMP = case os:getenv("TMPDIR") of
false -> "/tmp";
Dir -> Dir
end,
name(TMP ++ "/" ++ ?TEMPLATE).
name(Template) ->
template(Template, ?ALPHANUM).
template(Name, Chars) ->
crypto:start(),
template(lists:reverse(Name), [], Chars).
template([$X|Rest], Acc, Chars) ->
template(Rest,
[lists:nth(crypto:rand_uniform(1, length(Chars)+1), Chars)|Acc],
Chars);
template(Name, Rand, _) when length(Rand) >= 6 ->
lists:reverse(Name) ++ Rand.
make_dir(Path) ->
case file:make_dir(Path) of
ok ->
file:write_file_info(Path, #file_info{mode = ?S_IRWXU});
Error ->
Error
end.
close(Path) ->
file:del_dir(Path).
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