[FR] Allow `--tool` to overwrite? OR option to disable all plugins loaded by entry-points?

[abravalheri]

I run into a situation that I wanted to test local schemas changes in setuptools and see if they work first before cutting new releases to validate-pyproject.

So my strategy was to have local .spec.json files and load them with --tool ...=file://....
However I run into a problem:

[ERROR] SchemaWithDuplicatedId: All schemas used in the validator MUST define a unique toplevel `"$id"`

This happens because the plugin is loaded from an entry-point and from tool.

So I thought about to alternatives not mutually exclusive:

1. Allow --tool to always overwrite whatever plugin is loaded from entry-points (I believe this is done in Allow overwrite when schemas refer to the same tool #175).
2. Add an option to the CLI to disable all plugins loaded from entry-points¹

Footnotes

1. This might also be useful for improving reproducibility. But it becomes more complicated to handle if we also allow "extra" (non-tool, "side-car") plugins to be loaded from entry-points, in the sense that we would have a bunch of open questions... ↩