tools/distrib/check_nanopb_output.sh

#!/bin/bash
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set -ex

readonly NANOPB_TMP_OUTPUT="$(mktemp -d)"
readonly PROTOBUF_INSTALL_PREFIX="$(mktemp -d)"

# install protoc version 3
pushd third_party/protobuf
./autogen.sh
./configure --prefix="$PROTOBUF_INSTALL_PREFIX"
make -j 8
make install
#ldconfig
popd

readonly PROTOC_BIN_PATH="$PROTOBUF_INSTALL_PREFIX/bin"
if [ ! -x "$PROTOBUF_INSTALL_PREFIX/bin/protoc" ]; then
  echo "Error: protoc not found in temp install dir '$PROTOBUF_INSTALL_PREFIX'"
  exit 1
fi

# stack up and change to nanopb's proto generator directory
pushd third_party/nanopb/generator/proto
export PATH="$PROTOC_BIN_PATH:$PATH"
make -j 8
# back to the root directory
popd

#
# Checks for load_balancer.proto
#
readonly LOAD_BALANCER_GRPC_OUTPUT_PATH='src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1'
# nanopb-compile the proto to a temp location
./tools/codegen/core/gen_nano_proto.sh \
  src/proto/grpc/lb/v1/load_balancer.proto \
  "$NANOPB_TMP_OUTPUT" \
  "$LOAD_BALANCER_GRPC_OUTPUT_PATH"

# compare outputs to checked compiled code
if ! diff -r $NANOPB_TMP_OUTPUT src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1; then
  echo "Outputs differ: $NANOPB_TMP_OUTPUT vs $LOAD_BALANCER_GRPC_OUTPUT_PATH"
  exit 2
fi