Fix lockfile generation for shadowed resolves #21642
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for example, `black` exposes the resolve "black" so that `pants export --resolve=black` works. But if `[black].install_from_resolve` is set to "my_resolve", we shouldn't expose the resolve "black"
the request is selected twice, but they're identical because they select by name. We can just use a set to deduplicate them
A resolve name could be provided by both users and tools, so it was possible to have the same requested name twice. This fixes that by deduplicating them in the request.
lilatomic
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category:bugfix
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When a user resolve shadows a tool resolve,
pants generate-lockfileswill generate the lockfile twice.This is because only the
--requestarg is deduplicated. Without one specified, all known resolves are added to a non-deduplicated collection. The resolves are added separately for each backend andExportableTool. This can introduce duplicates into this list. And, although the shadowing is correct, the resolve is exported twice. For example, the tool Black and a user resolve named "black" will both use the same resolve name, resulting in a list of resolves to export likeRequestedPythonUserResolveNames(['black', 'python-default', 'coverage-py', 'pytest', 'ipython', 'black']).This MR makes 3 adjustments to this process:
RequestedUserResolveNamesis now aDeduplicatedCollection. This mitigates the most proximate issue of specifying the same resolve.GeneratePythonLockfile. This may already be covered by 1, but can't hurt[black].install_from_resolve="linters", its default resolve "black" will not be exposed.Note that in the case of shadowing without
install_from_resolve, although the shadowed resolve is not surfaced (for export), Pants will still correctly use the default lockfile.closes #21625