Missing composer repository /app when building typo3 docker container

[claussni]

Problem

Attempt to build the TYPO3 images failed because of an error in Dockerfile-TYPO3 that was previously masked by PHP Composer behavior. The local file PHP Composer repository /app is not yet mounted when the composer require steps are started:

Step 9/11 : RUN composer require devlog/devlog:~3.0.4 &&     composer require kitodo/presentation
 ---> Running in 3d770007d9ce
                                                                    
  [RuntimeException]                                                
  The `url` supplied for the path (/app) repository does not exist

Cause

The issue seem to come up with newer Composer versions. Even if the docker-compose file includes a volumes section, those volumes are not mounted before the image build. Thus "/app" is not available in the Docker container at build time and can not serve as Composer repository until the call to COPY /app.

The only reason why this could have worked before must be different handling of missing repositories in PHP composer. There are hints to such changes in https://github.com/composer/composer/releases/tag/1.10.2 regarding symlink repositories.

Solution

The Dockerfile.TYPO3 needs to be fixed. In order to give PHP Composer access to the local repository, the COPY /app statement needs to happen before the first composer require calls.