roll: pigweed pw_protobuf: Support directly specifying options file locations

Replace the existing import-prefix arg to pwpb protoc plugin with an
option to directly specify the location of any .options files to load
from.

The import-prefix option was added to try and find options files whose
proto paths had been modified via the import_prefix bazel attr. This
worked fine as long as you were careful to place your options files in a
place where the existing search paths could find them.

We've found it's easy to break this arrangement if the real path of the
.options file isn't prefixed by the virtual import path of the proto.

This could be fixed by a further complicated dance of constructing
search paths that the plugin will then further mangle to check if the
options file exists.

This CL instead directly specifies the location of any options files for
the pwpb plugin, while leaving in place the existing search path logic
required for nanopb options files.

Original-Bug: https://pwbug.dev/253068333
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/240833
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: 6efc99b3ee854dd54a0b1465d9014c54e01b21b9

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 4321a46654fae2..6efc99b3ee854d
Roller-URL: https://ci.chromium.org/b/8734531451229149041
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I30dd33dd6d0f7d667b29568f4ce18f2d7d0ab858
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/241043
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
1 file changed
tree: 98637023c00143827ec65fb93de9374384bb45c7
  1. .github/
  2. .vscode/
  3. apps/
  4. modules/
  5. system/
  6. targets/
  7. tools/
  8. .bazelignore
  9. .bazelrc
  10. .bazelversion
  11. .buildifier.json
  12. .clang-format
  13. .clangd.shared
  14. .gitignore
  15. .pw_console.yaml
  16. AUTHORS
  17. BUILD.bazel
  18. CONTRIBUTING.md
  19. LICENSE
  20. MODULE.bazel
  21. OWNERS
  22. pigweed.json
  23. README.md
README.md

Pigweed: minimal Bazel example

This repository contains a minimal example of a Bazel-based Pigweed project. It is a LED-blinking service (featuring RPC control!) for the Raspberry Pi Pico. It can also be run on any computer using the included simulator.

Getting the code

git clone https://pigweed.googlesource.com/pigweed/quickstart/bazel pw_bazel_quickstart
cd pw_bazel_quickstart

Dependencies

The only dependency that must be installed is Bazelisk.

Bazelisk is a launcher for the Bazel build system that allows for easy management of multiple Bazel versions.

Instructions for installing Bazelisk can be found here.

Running on the simulator

To run the simulator, type: bazelisk run //apps/blinky:simulator_blinky Then, in a new console, connect to the simulator using: bazelisk run //apps/blinky:simulator_console

Running on hardware

To start, connect a Raspberry Pi Pico, Pico 2, or debug probe via USB.

To run on the Raspberry Pi Pico, type: bazelisk run //apps/blinky:flash_rp2040 Then, in a new console, connect to the device using: bazelisk run //apps/blinky:rp2040_console

Controlling the LED

Once connected with a console, RPCs can be sent to control the LED. Try running:

device.set_led(True)
device.set_led(False)
device.toggle_led()
device.blink(blink_count=3)

Running unit tests on the host device

bazelisk test //... will run the unit tests defined in this project, such as the ones in modules/blinky/blinky_test.cc.

Running unit tests on hardware

bazelisk run @pigweed//targets/rp2040/py:unit_test_server in one console followed by bazelisk test //... --config=rp2040 will also allow running the unit tests on-device.

Next steps

Try poking around the codebase for inspiration about how Pigweed projects can be organized. Most of the relevant code in this quickstart (including RPC definitions) is inside modules/blinky, with some client-side Python code in tools/console.py.