x/build: automate testing "toolstash -cmp" with trybots #10418
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x/build issues (builders, bots, dashboards)
FeatureRequest
Issues asking for a new feature that does not need a proposal.
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For cleanup CLs like https://go-review.googlesource.com/#/c/8762, it would be nice if the trybots could take care of building a toolchain at HEAD, toolstash saving it, rebuilding at HEAD+CL, and then running an appropriate "toolstash -cmp" build.
Using toolstash/buildall, this only needs to be run once on a fast/cheap trybot type (e.g., linux/amd64) to avoid wasting more expensive trybot resources (e.g., OS X and/or ARM).
Obviously this would only be on an opt-in basis. Perhaps just a new dedicated trybot type that doesn't run by default, is configured with a different testing script than running all.bash, and is selected via whatever +trybot mechanism is implemented.
Maybe too niche a use case, but some rationale:
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