Generate the protobuf files at build time (#219)

Improve the build reliability by ensuring protobuf files are
generated at build time.

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "libopencm3"]
 	path = vendor/libopencm3
 	url = https://github.com/libopencm3/libopencm3.git
+[submodule "vendor/nanopb"]
+	path = vendor/nanopb
+	url = https://github.com/nanopb/nanopb.git

Dockerfile

@@ -8,4 +8,5 @@ RUN apt-get update
 
 # install build tools and dependencies
 
-RUN apt-get install -y build-essential git python python-ecdsa gcc-arm-none-eabi
+RUN apt-get install -y build-essential git python python-ecdsa gcc-arm-none-eabi protobuf-compiler \
+	libprotobuf-dev python-protobuf python3-protobuf

build-firmware.sh

@@ -13,6 +13,8 @@ docker run -t -v $(pwd)/build:/build:z $IMAGE /bin/sh -c "\
 	git checkout $TAG && \
 	git submodule update --init && \
 	make -C vendor/libopencm3 && \
+	make -C vendor/nanopb/generator/proto && \
+	make -C firmware/protob && \
 	make && \
 	make -C firmware sign && \
 	cp firmware/trezor.bin /$BINFILE && \

firmware/protob/Makefile

@@ -1,7 +1,7 @@
 all: messages.pb.c storage.pb.c types.pb.c messages_map.h
 
 %.pb.c: %.pb %.options
-	nanopb_generator.py $< -L '#include "%s"' -T
+	../../vendor/nanopb/generator/nanopb_generator.py $< -L '#include "%s"' -T
 
 %.pb: %.proto
 	protoc -I/usr/include -I. $< -o $@

vendor/nanopb

@@ -0,0 +1 @@
+Subproject commit 54c34a9fda152937d4cd0c7fd85c067fca23af75