roll: pw_toolchain, pw_toolchain: pw_env_setup: Suppress error message when running outside git repo

When doing pw_env_setup from a directory that is not a git repo, the
cipd wrapper would log a 'fatal error' but continue on when determining
which useragent to send with request. Suppress it the same way we
suppress the other git call in this file. Write stderr to /dev/null.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/217216
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
pw_toolchain, pw_toolchain Rolled-Commits: 144113cb55fa118..81b9531df0d3fcb
Roller-URL: https://ci.chromium.org/b/8744490778677189681
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I27a32e97d1ba9812ae3f048ec06066355720c840
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/217491
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
1 file changed
tree: 216d3f0a824b08e6e33b67b6b953539a6ef6c52c
  1. .github/
  2. src/
  3. targets/
  4. tools/
  5. .bazelignore
  6. .bazelrc
  7. .bazelversion
  8. .gitignore
  9. BUILD.bazel
  10. echo.bzl
  11. LICENSE
  12. pigweed.json
  13. README.md
  14. requirements.in
  15. requirements_lock.txt
  16. WORKSPACE
README.md

Pigweed: minimal Bazel example

This repository contains a minimal example of a Bazel-based Pigweed project. It's an echo application for the STM32F429 Discovery Board.

Cloning

git clone --recursive https://pigweed.googlesource.com/pigweed/quickstart/bazel

If you already cloned but forgot to include --recursive, run git submodule update --init to pull all submodules.

TODO: b/300695111 - Don't require submodules for this example.

Building

We‘ll assume you already have Bazel on your system. If you don’t, the recommended way to get it is through Bazelisk.

To build the entire project (including building the application for both the host and the STM32 Discovery Board), run

bazel build //...

To run the application locally on your machine, run,

bazel run //src:echo

Flashing

To flash the firmware to a STM32F429 Discovery Board connected to your machine, run,

bazel run //tools:flash

Note that you don't need to build the firmware first: Bazel knows that the firmware images are needed to flash the board, and will build them for you. And if you edit the source of the firmware or any of its dependencies, it will get rebuilt when you flash.

Communicating

Run,

bazel run //tools:miniterm -- /dev/ttyACM0 --filter=debug

to communicate with the board. When you transmit a character, you should get the same character back!