This repository is to act as an example for erroneous Drupal 8 core patching with cweagans/composer-patches and composer, and nothing more.
Branch: example-with-error
This branch contains a completely fresh Acquia BLT project setup after running the standard composer create-project command:
composer create-project --no-interaction acquia/blt-project my-project
You will note that there is absolutely no modifications to the standard composer.json outside of any common changes.
A complete codebase has been pushed to the branch example-with-error-built through the use of git add --all --force.
Observe that under the docroot/core directory that a subdirectory named b (link) exists, as well as an additional core (link) directory.
Branch: example-without-error
This branch contains a few minor modifications to the project's root composer.json file in which it makes use of the revised cweagans/composer-patches project and additional Composer plugin named composer-patches-drupal-patching.
A completely built codebase, similar to that of the example-with-error-built is available named example-without-error-built. This was similarly created through the use of git add --all --force upon executing a composer install with the modified composer.json.
Observe that under the docroot/core directory no longer contains the additional or new subdirectories b or core and that patches have in fact been applied to Drupal core where they previously were not.