DT-1035: drupal-composer/drupal-scaffold conflicts with drupal/core-composer-scaffold

[CraigGardener]

From Drupal 8.8 it is recommended to use the drupal/recommended-project composer project template as per https://www.drupal.org/docs/develop/using-composer/starting-a-site-using-drupal-composer-project-templates.

Adding BLT to this currently fails due to the conflict between drupal/core-composer-scaffold (new scaffold plugin, maintained by core team) and drupal-composer/drupal-scaffold (old scaffold plugin, not maintained by core team).

BLT should require the new drupal/core-composer-scaffold plugin instead.

[danepowell]

Not sure if this is a dupe of #3563 (comment), but I think my comment there still applies.

The problem is that BLT 11 will support both Drupal 8.7 and 8.8. Since drupal-scaffold and composer-scaffold are mutually exclusive, BLT has to choose one or the other, I don't see how to support both. I think we have to stick with Drupal scaffold until we drop support for Drupal 8.7 at its EOL (May 2020).

Do you know of any way around that?

[CraigGardener]

Would it make sense for both 11 and 12 to be considered "stable" with 11 for <8.8 and 12 for >=8.8 Or handle the requirement for a scaffold package as part of blt init scripts, similar to the recipe for drupalvm, adding the necessary package to the composer.json in the project root? Just a thought, which would allow people to use 8.8 right away

…

On Tue, 26 Nov 2019, 18:09 Dane Powell, ***@***.***> wrote: Not sure if this is a dupe of #3563 (comment) <#3563 (comment)>, but I think my comment there still applies. The problem is that BLT 11 will support both Drupal 8.7 and 8.8. Since drupal-scaffold and composer-scaffold are mutually exclusive, BLT has to choose one or the other, I don't see how to support both. I think we have to stick with Drupal scaffold until we drop support for Drupal 8.7 at its EOL (May 2020). Do you know of any way around that? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#3929?email_source=notifications&email_token=ABRBNUKOMPZJXFAHF32VYETQVVQ4TA5CNFSM4JRZYWSKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEFG6DPQ#issuecomment-558752190>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABRBNUJES2OXHR7QVEWVIWLQVVQ4TANCNFSM4JRZYWSA> .

[danepowell]

We're still considering how to handle Composer Scaffold going forward. In the meantime, there's nothing stopping you from using Drupal 8.8 today with BLT 10/11. Although Composer Scaffold is recommended, Drupal Scaffold will work just fine until Drupal 8.9. However if you already have a Drupal 8.8 project using Composer Scaffold, you are correct that you can't add BLT to it today.

[danepowell]

I think we're going to fix this in three phases:

1. In this ticket, move the drupal-scaffold dependency from BLT's composer.json to the blt-project template composer.json. This will fix the immediate issue of not being able to add BLT to an existing Drupal 8.8 project. It will also let people manage Drupal/Composer scaffold however they'd like until we can implement the next steps.
2. Switch the blt-project template composer.json to Composer Scaffold. (Use composer-scaffold to build new BLT projects #3563) Note that this will create new BLT projects using Composer Scaffold, but existing projects won't be affected. That's why we need...
3. A migration command to help people move from Drupal Scaffold to Composer Scaffold prior to its removal/full deprecation in Drupal 8.9.