php - Error : "Unable to open image" only in docker container

I have a problem with my symfony application running in docker container.

I have this class :

use Imagine\Gd\Imagine;
use Imagine\Image\Box;

class ImageOptimizer
{
    private $imagine;

    public function __construct()
    {
        $this->imagine = new Imagine();
    }

    public function resize(string $filename, int $maxWidth, int $maxHeight): void
    {
        list($iwidth, $iheight) = getimagesize($filename);
        $ratio = $iwidth / $iheight;
        if ($maxWidth / $maxHeight > $ratio) {
            $maxWidth = $maxHeight * $ratio;
        } else {
            $maxHeight = $maxWidth / $ratio;
        }

        $photo = $this->imagine->open($filename);
        $photo->resize(new Box($maxWidth, $maxHeight))->save($filename);
    }
}

Copy code

And I get this error :

Imagine\Exception\RuntimeException:
Unable to open image /code/public/uploads/thumbs/5edfa023852b3_image04625777-6124eee4b5d20.jpeg

  at vendor/imagine/imagine/src/Gd/Imagine.php:95
  at Imagine\Gd\Imagine->open('/code/public/uploads/thumbs/5edfa023852b3_image04625777-6124eee4b5d20.jpeg')
     (src/Service/ImageOptimizer.php:33)
  at App\Service\ImageOptimizer->resize('/code/public/uploads/thumbs/5edfa023852b3_image04625777-6124eee4b5d20.jpeg', 203.0513176144244, 244)
     (src/Service/FileUploader.php:67)
  at App\Service\FileUploader->resizeImages('5edfa023852b3_image04625777-6124eee4b5d20.jpeg')
     (src/Service/FileUploader.php:59)
  at App\Service\FileUploader->upload(object(UploadedFile))
     (src/Controller/Admin/NewsController.php:86)
  at App\Controller\Admin\NewsController->editAction(object(Request), 1)
     (vendor/symfony/http-kernel/HttpKernel.php:158)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
     (vendor/symfony/http-kernel/HttpKernel.php:80)
  at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
     (vendor/symfony/http-kernel/Kernel.php:201)
  at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
     (public/index.php:25)               
Copy code

The same code works in a non-dockerized environnement with the same php version and the same picture !

If I debug the "open" function step by step, I find this :

// file : /code/vendor/imagine/imagine/src/File/Loader.php
    protected function readLocalFile()
    {
        $this->checkLocalFile();
        $data = @file_get_contents($this->path);
        if ($data === false) {
            throw new InvalidArgumentException(sprintf('Failed to read from file %s.', $this->path));
        }

        return $data;
    }
Copy code

The $data variable contain the binary of the image file, and if I compare the binary from the non dockerized environment, they are different... The $data value from the docker seems to be badly encoded.

There is my docker files :

docker-compose.yml

version: "2"
services:
    web:
        image: nginx:latest
        ports:
            - "80:80"
        volumes:
            - ./code:/code
            - ./default.conf:/etc/nginx/conf.d/default.conf
        links:
            - php
    php:
        build: ./conf
        volumes:
            - ./code:/code
    (...)
Copy code

conf/Dockerfile

FROM php:7-fpm

RUN apt update \
    && apt install -y libzip-dev libpng-dev libicu-dev

RUN docker-php-ext-install pdo pdo_mysql zip gd intl

Copy code

And my symfony version is 4.4.26 and the imagine version is 1.2.4.

Didn't find the answer?

Our community is visited by hundreds of web development professionals every day. Ask your question and get a quick answer for free.