[Proposal] Global default exec_groups

[Susan Steinman]

I've added a new proposal for exposing default exec_groups representing the most common platform constraints. We're planning on exposing default exec_groups internally, and were wondering whether this feature should also exist in Bazel.

Please take a look: https://github.com/bazelbuild/proposals/blob/main/designs/2022-07-07_global_exec_groups.md

Thanks,

Susan

[Ivo Ristovski List]

A stupid question. Why don’t we add exec_compatible_with to ctx.actions.run? The user could specify platform constraint directly there. There would be no need for global ones and functions running an action would not need to update rule definition, leading to better architecture of the rules. 

Is there a caveat and something needs to happen with all global definitions before the rule is processed?

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Ivo List |

Software Engineer |

il...@google.com |

[John Cater]

Adding the exec constraints at the action level is too late: the execution platform is determined during toolchain resolution, _before_ the rule implementation is invoked. The exec constraints are used to inform toolchain resolution about what sort of execution platforms are acceptable.

By the time the rule implementation is invoked, Bazel needs to have already decided on things like available toolchain implementations and what the execution platform is (for each exec group).

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[Tony Aiuto]

Was there any closure on this?

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[Susan Steinman]

Working plan is to go ahead with the design.