Ability to grant role membership to existing user

[mikkoc]

Is there a way to grant role membership to an existing user that is not created by Terraform?

I cannot seem to find any.

To be clear, I'd like to run something like this:

GRANT admins TO joe;

via Terraform. But this resource: https://www.terraform.io/docs/providers/postgresql/r/postgresql_grant.html seems focused only on Databases.

The user in question is the RDS master user, which is created automatically by RDS: we cannot create it in Terraform.

Thanks

[Vince-Chenal]

Hello,
I started to write something to support this but I don't really know if I chose the good way.

Can anyone have a look at this branch I have ?
The idea is to create a new resource "grant_role".

add-grant-role-resource

It's not finished yet but I would prefer to gather opinions before continuing

[k911]

We've also encountered this issue while trying to manage RDS db via postgres provider. RDS master user is created and managed by AWS. @Vince-Chenal personally, I really like the idea.

[pacecreative]

This would be incredibly helpful as this is the only step remaining that I need to be able to implement terraform with our postgresql instance.