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rfc: Minor revision to "Miscellaneous Configuration Settings in Modules"

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While drafting this RFC originally I had intended to carve out an exception
of ignoring required_version arguments in .tf files while continuing to
support them in .tofu files, but apparently I lost that detail during some
copyediting and so the current draft implies that OpenTofu would continue
to use required_version in .tf files unless there's an OpenTofu-specific
declaration that takes precedence.

This update aims to clarify the proposal's handling of modules that are
written only for Terraform without using any OpenTofu-specific mechanisms:
in that case, we must just make a best effort to load the module in
OpenTofu and let it fail with a more specific error if the module happens
to be using language features that OpenTofu does not support, so that
loading can succeed when the module is only using the subset of features
that are cross-compatible between both systems.

Signed-off-by: Martin Atkins <mart@degeneration.co.uk>
This commit is contained in:
Martin Atkins 2025-10-21 16:44:47 -07:00
parent 31d7bddbc2
commit bc0faecff8
1 changed files with 7 additions and 3 deletions
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rfc/20250730-module-misc-settings.md
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@ -117,13 +117,17 @@ recommend that authors create both a `.tf` file and a `.tofu` file of the
same basename, and place the Terraform version constraint in the `.tf` file
and the OpenTofu constraint in the `.tofu` file.
This document does not propose to change anything about that behavior, so
that all existing uses of that pattern will retain their current meaning.
As part of implementing this proposal, we would _slightly_ change the existing
behavior so that OpenTofu will always completely ignore `required_providers`
settings in `.tf` and `.tf.json` files, assuming that they are intended for
Terraform. OpenTofu will continue to honor `required_providers` arguments
in `.tofu` and `.tofu.json` files, so existing modules already using that
pattern will retain their current meaning.
Module authors that wish to support OpenTofu versions prior to the introduction
of the `language` block type should continue following the existing pattern.
Authors should adopt a `language` block and nested `compatible_with` block
only once the minimum required OpenTofu version is one that supports that
only once the minimum required OpenTofu version is one that supports the new
syntax.
Authors of broadly-shared modules might prefer to delay adopting the new syntax