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[Console] don't check tty on stdin, it breaks with "data lost during stream conversion" #36696

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merged 1 commit into from May 5, 2020
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[Console] don't check tty on stdin, it breaks with "data lost during stream conversion" #36696

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8 changes: 3 additions & 5 deletions src/Symfony/Component/Console/Helper/QuestionHelper.php
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Expand Up @@ -462,10 +462,6 @@ private function validateAttempts(callable $interviewer, OutputInterface $output
$error = null;
$attempts = $question->getMaxAttempts();

if (null === $attempts && !$this->isTty()) {
$attempts = 1;
}

while (null === $attempts || $attempts--) {
if (null !== $error) {
$this->writeError($output, $error);
Expand All @@ -477,6 +473,8 @@ private function validateAttempts(callable $interviewer, OutputInterface $output
throw $e;
} catch (\Exception $error) {
}

$attempts = $attempts ?? -(int) $this->isTty();
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Was the motivation to move this inside a loop because isTty() result may change between iterations? I wonder how can that happen

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echo "$several_answers" | the-command breaks in real life, with stream_isatty() emitting PHP warnings "data lost during stream conversion".

Moving after reading the response means we never hit this line when correct responses are provided. Which is the case in the described situation (programmatic filling of answers.)

}

throw $error;
Expand Down Expand Up @@ -517,7 +515,7 @@ private function isTty(): bool
return stream_isatty($inputStream);
}

if (!\function_exists('posix_isatty')) {
if (\function_exists('posix_isatty')) {
return posix_isatty($inputStream);
}

Expand Down