OpenTofu support

[skyzyx]

OpenTofu support

[xescugc]

The plans are to move to OpenTF as Hashicorp is still keeping the new license.

The use this lib has of Terraform is really unconventional, we are importing it as a lib, which is against the Hashicorp recommendations and to further it more they moved all the code to internal/ so no one can actually do what we are doing.

For this reason we have a fork of Terraform with the changes we need for it to be able to be imported, the changes are automated in a script:

• Change the registered RPC: https://github.com/cycloidio/terracognita/blob/master/scripts/terraform-provider-update/update.sh#L20 so we can import Terraform and the SDK
• Move everything out of internal/ hashicorp/terraform#28723: https://github.com/cycloidio/terracognita/blob/master/scripts/terraform-provider-update/update.sh#L25

I guess we'll have to do the same with OpenTF.

So to answer the questions:

If there is a bug in OpenTF that does not exist in Terraform (or vice-versa), will bug reports (as they pertain to this project) be treated equally on both platforms?

Yes, we'll support OpenTF as we will also use it

Will testing be performed with code targeting both platforms?

Would be nice to add but it'll not be that easy as it requires changes to the codebase to run it in different libraries, as we do not run TF as a binary but import it as a lib.

For OpenTF's potential future "superset" functionality, will that be treated as a first-class citizen? (Most members of the Terraform ecosystem are planning to take this on a case-by-case basis, which is perfectly reasonable.)

We'll handle it case by case.

We also have other projects that are importing Terraform that we'll move to OpenTF eventually:

• InfraMap: https://github.com/cycloidio/inframap
• TerraCost: https://github.com/cycloidio/terracost
• tf-config: https://github.com/cycloidio/tf-config which is basically a set of helpers removed from TF. It's a lib used internally at Cycloid product.