symfony - Docker, TravisCI, PHP file uploads and intermittent permissions error on /tmp -


i have intermittent file upload error, occurring in travis:

warning: file_put_contents(/tmp/customerdownload_1502892540/image.png): failed open stream: permission denied (500 internal server error)

this symfony 2.8 project running on php 7.1 docker container. there's behat scenario test file uploading administrators , downloading users. method creating file follows:

/**  * @param string $filecontents  * @param media $file  * @return file  */ private function createlocaltemporaryfile(string $filecontents, media $file): file {     $tmpdir = '/tmp/customerdownload_' . time();     if (!file_exists($tmpdir)) {         mkdir($tmpdir);     }     $tmpfilepath = $tmpdir . '/' . $file->getname();     file_put_contents($tmpfilepath, base64_decode($filecontents));     $tmpfile = new file(realpath($tmpfilepath));      return $tmpfile; }

it fails 20% of time significant amount. never locally or in production. i've tried setting permissions on /tmp include www-data user:group has no effect. i'm confused why wouldn't able put contents file in directory had created in first place.

can suggest why might happening, or how ensure doesn't?

i believe sort of race condition , file naming issue. i'm using same file tests , perhaps tests running fast enough it's trying write on file , and cannot. updated method following , far in 12 tests, hasn't failed.

/**  * @param string $filecontents  * @param media $file  * @return file  */ private function createlocaltemporaryfile(string $filecontents, media $file): file {     $tmpdir = '/tmp/' . uniqid('customerdownload_', true);     mkdir($tmpdir);     $tmpfilepath = $tmpdir . '/' . $file->getname();     file_put_contents($tmpfilepath, base64_decode($filecontents));     $tmpfile = new file(realpath($tmpfilepath));      return $tmpfile; }

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