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Proper use of --platforms for 'bazel run' and --run_under #21805

Answered by katre
moroten asked this question in Q&A
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bazel run is currently not working well with platforms.

I agree that the right approach would be for run to ignore the target platform (or ensure it matches the host) and use --host_platform, since it's implicitly running on the bazel host. We haven't ever prioritized doing anything special here because the default is that --platforms defaults to --host_platform, so it's mostly there. (But I'd be happy to review a PR!)

The intersection of bazel run, --platforms, and --run_under is much more confusing and needs more thought though, but my first instinct is:

  1. The actual thing that runs is whatever --run_under points to (@rules_oci//:push in your example), and that's running on the host plat…

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@gregestren
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