/usr/share/php/GuzzleHttp/Stream/NoSeekStream.php is in php-guzzle-stream 3.0.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | <?php
namespace GuzzleHttp\Stream;
/**
 * Stream decorator that prevents a stream from being seeked
 */
class NoSeekStream implements StreamInterface
{
    use StreamDecoratorTrait;
    public function seek($offset, $whence = SEEK_SET)
    {
        return false;
    }
    public function isSeekable()
    {
        return false;
    }
    public function attach($stream)
    {
        $this->stream->attach($stream);
    }
}
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