How to declare multiple drush.services.yml files in one composer.json

[mstenta]

Existing document

https://www.drush.org/latest/commands/#specifying-the-services-file

What are you attempting to do

In some cases, a single project with a single composer.json file may have multiple sub-modules, each providing their own Drush commands and drush.services.yml files. How should this be handled in the project's root composer.json file?

Two scenarios where this happens:

1. Modules that have sub-modules.
2. Distributions that include modules.

Specifically, I am curious how to solve this for (2) in the farmOS distribution, where we have two different modules that provide Drush commands:

• https://github.com/farmOS/farmOS/blob/2.x/modules/core/migrate/drush.services.yml
• https://github.com/farmOS/farmOS/blob/2.x/modules/core/update/drush.services.yml

And here is the distro's composer.json: https://github.com/farmOS/farmOS/blob/2.x/composer.json

In what way is the existing documentation unclear or incomplete

It is unclear how to handle the above situation.

What should the documentation say instead?

TBD (and happy to open a PR once I understand!)

[weitzman]

The expectation is that you have a composer.json in each directory (migrate and update). Its OK if the composer.json has nothing in it except for the drush line.

[mstenta]

Ah thanks @weitzman! I'll give that a try and contribute some language back to the docs if it seems like it would be helpful to others.

[mstenta]

Confirmed that adding minimal composer.json files to the sub-module directories works!

Here is a PR that adds a bit of language to the docs to describe this: #5312