Enable symlink to external sources (or document how to configure)

[elmar-hinz]

Hello, I don't the if there is a technical solution for this.

A) Docker-Boilerplate installs composer typo3/cms-base-distribution.
B) The core development uses composer typo3/cms.

The setups of both composers are different. It requires to different projects:

# The server for FE and BE (docker)
OpenSource/TYPO3.Server/
  app/web
  app/vendor/typo3/cms
  app/composer.json

# The sources to develop and test (not docker)
OpenSource/TYPO3.Source/
  composer.json

I would like to symlink the sources into the server as app/vendor/typo3/cms. When creating a symlink the web server breaks. It is outside of apache document root and outside of the mounted docker directories.

When I place the directory instead of symlinking the web server works, but I get issues with the nesting of two composer projects.

I report this, because I think it is a typical use case to link sources into the server, either for reasons of core development or to test different versions of the core.