trezor-firmware/tools/build_protobuf

#!/bin/bash
CURDIR=$(pwd)
mkdir -p $CURDIR/pb2/
touch $CURDIR/pb2/__init__.py

mkdir -p ../src/trezor/messages

INDEX=../src/trezor/messages/wire_types.py
rm -f $INDEX
echo '# Automatically generated by pb2py' >> $INDEX
echo 'from micropython import const' >> $INDEX
echo '' >> $INDEX

for i in types messages storage ; do
    # Compile .proto files to python2 modules using google protobuf library
    cd $CURDIR/../../trezor-common/protob
    protoc --python_out=$CURDIR/pb2/ -I/usr/include -I. $i.proto
done

# hack to make output python 3 compatible
sed -i 's/^import types_pb2/from . import types_pb2/g' $CURDIR/pb2/messages_pb2.py
sed -i 's/^import types_pb2/from . import types_pb2/g' $CURDIR/pb2/storage_pb2.py

for i in types messages storage ; do
    # Convert google protobuf library to trezor's internal format
    cd $CURDIR
    ./pb2py -m -p $CURDIR -i $INDEX $i ../src/trezor/messages/
done

rm -rf $CURDIR/pb2/