Previously this is a task that I've just taken on using my own knowledge
of how these parts fit together, but that's not at all a sustainable
situation, and so here I've just documented the steps I've followed in for
previous Unicode version upgrades, and thus which I'd expect to follow
for future Unicode version upgrades too.
I hope this is also a somewhat-interesting overview of how Terraform makes
use of Unicode, even for folks who are just working on the other relevant
features of Terraform and not specifically trying to change Terraform's
Unicode support.
Since I'm the primary maintainer of two of the dependencies involved in
this it seems likely that following this process will still involve me
in _some_ capacity, but hopefully only necessarily in the form of
reviewing PRs and cutting new releases of those libraries.
This is an initial partial description of the plugin protocol focused
mainly on explaining the purpose of the .proto files. In subsequent
updates we will also document the negotiation protocol, etc.
For this first pass the goal was just to publish some information that was
already available in an internal design document so that it's visible to
SDK implementers. It is focused on the .proto versioning strategy because
that was the main topic of the internal design documentation this was
based on.
For a while now we've been gathering some codebase-level docs that felt
out-of-place on the main Terraform website (since they are about the
implementation, not usage) but we had no existing suitable place to put
them.
In order to make this information more available (and, hopefully, more
likely to stay up-to-date as we change things), here we'll establish the
"docs" directory as a place to keep documentation aimed at those who are
working on code changes to the Terraform Core codebase.
User-oriented docs should never appear in this directory. The Terraform
website is always the better place for those. The set of docs here is
rudimentary to start and we'll see if it makes sense to expand and
reorganize it over time based on the experience with having these initial
docs available.
