|  | @@ -22,9 +22,24 @@ cd $(dirname $0)/../../..
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				|  |  |  
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				|  |  |  source tools/internal_ci/helper_scripts/prepare_build_linux_rc
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				|  |  |  
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				|  |  | -# Update submodule and commit it so changes are passed to Docker
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				|  |  | +# Update submodule to be tested at HEAD
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				|  |  |  (cd third_party/$RUN_TESTS_FLAGS && git fetch --all && git checkout origin/master)
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				|  |  |  tools/buildgen/generate_projects.sh
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				|  |  | +
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				|  |  | +if [ "$RUN_TESTS_FLAGS" == "protobuf" ]
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				|  |  | +then
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				|  |  | +  # Upgrade bazel.
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				|  |  | +  # make_grpcio_tools.py requires bazel >=0.13.1 to run (Kokoro workers only have bazel 0.9)
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				|  |  | +  curl -fSsL -O https://github.com/bazelbuild/bazel/releases/download/0.13.1/bazel-0.13.1-installer-linux-x86_64.sh
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				|  |  | +  chmod +x ./bazel-0.13.1-installer-linux-x86_64.sh
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				|  |  | +  ./bazel-0.13.1-installer-linux-x86_64.sh --user
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				|  |  | +  rm -f ./bazel-0.13.1-installer-linux-x86_64.sh
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				|  |  | +  export PATH="$PATH:$HOME/bin"
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				|  |  | +
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				|  |  | +  tools/distrib/python/make_grpcio_tools.py
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				|  |  | +fi
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				|  |  | +
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				|  |  | +# commit so that changes are passed to Docker
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				|  |  |  git -c user.name='foo' -c user.email='foo@google.com' commit -a -m 'Update submodule'
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				|  |  |  
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				|  |  |  tools/run_tests/run_tests_matrix.py -f linux --inner_jobs 4 -j 4 --internal_ci --build_only
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