emulator: add docker build

Dockerfile.emulator

@@ -0,0 +1,17 @@
+# initialize from the image
+
+FROM debian:9
+
+# install build tools and dependencies
+
+RUN dpkg --add-architecture i386 && \
+    apt-get update && \
+    apt-get install -y \
+    build-essential curl unzip git python3 python3-pip gcc-arm-none-eabi libnewlib-arm-none-eabi libsdl2-dev:i386 libsdl2-image-dev:i386 gcc-multilib
+
+ENV PROTOBUF_VERSION=3.4.0
+RUN curl -LO "https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/protoc-${PROTOBUF_VERSION}-linux-x86_64.zip"
+RUN unzip "protoc-${PROTOBUF_VERSION}-linux-x86_64.zip" -d /usr
+RUN pip3 install "protobuf==${PROTOBUF_VERSION}" ecdsa
+
+RUN ln -s python3 /usr/bin/python

build-emulator.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+
+IMAGE=trezor-mcu-build-emulator
+TAG=${1:-master}
+ELFFILE=build/trezor-emulator-$TAG
+
+docker build -f Dockerfile.emulator -t $IMAGE .
+docker run -t -v $(pwd)/build:/build:z $IMAGE /bin/sh -c "\
+	git clone https://github.com/trezor/trezor-mcu && \
+	cd trezor-mcu && \
+	git checkout $TAG && \
+	git submodule update --init && \
+	make -C vendor/libopencm3 && \
+	make -C vendor/nanopb/generator/proto && \
+	make -C firmware/protob && \
+	EMULATOR=1 make && \
+	EMULATOR=1 make -C emulator && \
+	EMULATOR=1 make -C firmware && \
+	cp firmware/trezor.elf /$ELFFILE"