Symfony is a PHP web application framework and a collection of reusable PHP components/libraries.

When you try to complete your task, you get this error: “[ErrorException] file_put_contents(/root/.composer/cache/repo/https—flex.symfony.com/): failed to open stream: Is a directory“.

This error is one of the most popular errors any programmer will make. So, why does it appear, and how can it be resolved? We’ll go over it with you.

Why Does The Error: [ErrorException] file_put_contents(/root/.composer/cache/repo/https—flex.symfony.com/): failed to open stream: Is a directory Occur?

You are using the composer to build a Symfony 4 application, but you encounter the following error.

[ErrorException] file_put_contents(/root/.composer/cache/repo/https---flex.symfony.com/): failed to open stream: Is a directory

In another case, the build succeeds if you run composer install one more time without interruption.

The error returns if you delete the vendor and var/cache directories from the project directory. You tried the following methods:

• trigger ‘composer clearcache’ command no success
• Delete ~/.composer directory no success
• chmod -R 777 ~/.composer no success

Some builds of the same project within different containers have been successful. My container begins with the following volumes:

• project directory
• ~/.ssh directory

Three Effective Methods For You

And, guess what, we just solved it using some methods listed below.

Method 1: Take advantage of the privilege

The error has been resolved with the most recent version of Flex. So the Flex version was just updated.

Method 2: Change to manual signing.

The error occurred when we used composer 1.10.16. We still get the error after upgrading to 1.10.22. However, if we switch to 2.1.5, the error disappears.

Method 3: Follow this command

sudo chown -R $USER ~/.composer/

Now, we believe that your issue has been tackled.

Conclusion

The solutions mentioned above are the best options for those still confused with this error: “[ErrorException] file_put_contents(/root/.composer/cache/repo/https—flex.symfony.com/): failed to open stream: Is a directory”.

If you still need support or have other questions, we have one vibrant community where all members are always willing to give you a hand.  

We wish you a more successful day with new solutions and new code.