The rbe_ubuntu2004 directory contains the autogenerated toolchain configuration for linux RBE. Run generate_linux_rbe_configs.sh to regenerate.
The rbe_windows_bazel_6.3.2_vs2019 directory contains the autogenerated toolchain configuration for windows RBE. The configuration was generated by the rbe_configs_gen tool (just as the linux RBE config), but since it's a windows configuration, it needs to be run on a windows machine.
In order to regenerate:
grpc repository in a kokoro debug windows VM (see internal documentation for how to create one)generate_windows_rbe_configs.sh to regenerate the configs locally on the VM.gcloud compute scp command)Note that the bazel version denotes the bazel version that was used to generate the toolchain configuration. The configuration can be use with different bazel versions (as long as it works).
Also see go/rbe-windows-user-guide
The dockerfile/rbe_windows2019 directory contains the dockerfile to rebuild the docker image we use on RBE windows workers. See go/rbe-windows-user-guide.
Note that for linux, we use a docker image under tools/dockerfile (since for Linux RBE docker image is simply of the testing docker images we maintain)
On a kokoro debug windows VM, run the following:
docker build -t us-docker.pkg.dev/grpc-testing/testing-images-public/rbe_windows2019 third_party/toolchains/dockerfile/rbe_windows2019gcloud auth configure-docker us-docker.pkg.devdocker push us-docker.pkg.dev/grpc-testing/testing-images-public/rbe_windows2019generate_windows_rbe_configs.sh with the newly built & pushed image's SHA256 digest.