Add the ability to specify the version and tool from `buildtools`.

cgrindel commented 2 years ago

Related to #5.

Introduced buildtools_asset and buildtools_assets to aid in the definition of the tools that should be made available.
Added an assets argument to buildifier_prebuilt_register_toolchains so that a list of assets (tool, platform, arch, version) can be specified.
Moved the workspace dependency function to deps.bzl. Moved the http_file declarations to buildifier_prebuilt_register_toolchains.
Separated the toolchain by tool and placed them under Bazel packages with their respective name.
Added the specify_assets example to demonstrate the use of buildtools_assets. Added integration tests to exercise the example workspace.

cgrindel commented 2 years ago

@keith I am not sure if you have had a chance to review this PR, yet. I have a follow-on PR that adds a utility to generate a buildtools_assets declaration for the latest buildtools release or, if a release tag is specified, it will produce it for the specified release.

cgrindel commented 2 years ago

The asset declaration generation PR is ready. If you would like to see it while reviewing this PR, here is a link.

cgrindel commented 2 years ago

@keith I made some updates based upon your comments. I added a new issue (#9) to track an issue with buildozer usage. Let me know your thoughts.

keith / buildifier-prebuilt

Add the ability to specify the version and tool from `buildtools`. #7