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Vendor and patch Prost #1200

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Vendors https://github.com/danburkert/prost into third_party and applies a patch that will help pass handles in protobuf messages. for context, see #673.

This PR also includes a script that can be used to vendor prost and apply the patch to make it easier to maintain.

This is the first of a set of PRs that together provide the same functionality as #1108, but introduced in smaller portions.

Checklist

  • Pull request affects core Oak functionality (e.g. runtime, SDK, ABI)
    • I have written tests that cover the code changes.
    • I have checked that these tests are run by
      Cloudbuild
    • I have updated documentation accordingly.
    • I have raised an issue to
      cover any TODOs and/or unfinished work.
  • Pull request includes prototype/experimental work that is under
    construction.

wildarch added 3 commits June 26, 2020 11:20
The patch adds functionality to prost so we can pass handles in
protobufs.
Taken from https://github.com/danburkert/prost at commit
80256277997975948d257faf3f35c2890bf12787 ("prost-build: fix compilation
error when using --no-default-features").

Full repo with prost/prost-build/third_party removed.

To reproduce this commit, run `./scripts/vendor_prost.sh -c`.

Tests are passing with `PROTOC=/usr/bin/protoc cargo test`. Note the
PROTOC environment variable must be set because the bundled protobuf has
been removed.
patch file: `third_party/prost-0001-Patch-to-generate-typesafe-Sender-and-Receiver.patch`

To reproduce this commit, run `./script/vendor_prost.sh`.
@wildarch
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@daviddrysdale @tiziano88 as mentioned in #1108 (comment)

@wildarch wildarch mentioned this pull request Jun 26, 2020
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Closing this in favor of #1199.

@wildarch wildarch closed this Jun 26, 2020
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