Is there a way to add custom buf plugins to `buf_lint_test`?

[rmm-stripe]

Hello! I saw that buf supports custom plugins. I'm curious to find out if there is a way to write a custom plugin so that it can be run as a part of the buf_lint_test bazel rule. As in, I can write the plugin, include it in my config buf.yaml file and have the buf_lint_test run it.

Looking at buf_lint_test's atrributes, I was assuming that there would need to be some sort of way for me to pass a dependency on a binary that holds the logic for my custom plugin, but I don't see that reflected in any of the attributes. Wondering if there is a paved path for this already?

If this doesn't exist, would it be complicated to add?

We looked into it, and this is blocked, at the very least, because of bufbuild/buf#3786. There might still be more work needed if e.g. you want to be able to pass a Bazel target as a plugin, though, even once that is done.

[mkanat]

Hey, so that PR was actually merged, so the protoc plugin supports buf plugins now! However, it hasn't been plumbed through to the buf_lint_test rule.

The work for plugins shouldn't be very complex at all, since a plugin is just a go_binary. I already have my local buf lint using the plugin out of the bazel-bin directory; you just have to change your buf.yaml to point there or pass it in in the config json to the protoc plugin, I suppose. (That would be nice because then buf lint could still use the local bazel-bin path while the build uses the relative sandbox path.)

[srikrsna-buf]

With bufbuild/buf#3871, we can add support for these. We haven't gotten around to doing it yet. I see that you attempted to add it to rules_lint, using the plugin overrides is key, as that allows us to pass the sandbox path to the plugins.