Compiling OpenAuto to fix the touch screen

After a recent update to Android Google Play Services, the touch screen in Crankshaft stopped working. It seems that the problem is related to the use of the Protocol Buffers library, which has become stricter in this latest version of Play Services and apparently had not been implemented rigorously in OpenAuto.

This is the issue in Crankshaft where the topic is discussed.

The solution is to compile a fork of OpenAuto that one of the users prepared. Below is the step-by-step process to perform the build. The starting point is an installation of the latest version of Crankshaft available at the time of writing this (the NG Alpha-5 2019-06-08).

Enable DEV mode (needed at least so the system is mounted in read/write mode) by mounting the SD card on your computer and changing the DEV_MODE parameter to 1 (DEV_MODE=1) in the /boot/crankshaft/crankshaft_env.sh file. (source)
Mount the microSD, boot the system, find out its IP address (using Fing for example), and connect over SSH (user: pi; pwd: raspberry).

Update the package library and install some required packages:

$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get install -y libboost-all-dev libusb-1.0.0-dev cmake libprotobuf-dev protobuf-c-compiler protobuf-compiler librtaudio-dev

Download the development branch of abraha2d's aasdk fork:

$ cd ~
$ git clone -b development https://github.com/abraha2d/aasdk.git

(OPTIONAL) At the time of writing this guide I built commit 361380e7d74ddeaf17afd8cd89882001bb62c77e. If newer commits cause problems, check out the following revision:
```
$ cd aasdk
$ git checkout 361380e7d74ddeaf17afd8cd89882001bb62c77e
```

Build aasdk:

$ cd ~
$ mkdir aasdk_build
$ cd aasdk_build
$ cmake -DCMAKE_BUILD_TYPE=Release ../aasdk
$ make

Install some packages required to compile ilclient:

$ sudo apt-get install -y libraspberrypi-doc libraspberrypi-dev
$ cd /opt/vc/src/hello_pi/libs/ilclient
$ make

Download the crankshaft-ng branch of abraha2d's openauto fork:

$ cd ~
$ git clone -b crankshaft-ng https://github.com/abraha2d/openauto.git

(OPTIONAL) At the time of writing this guide I built commit d56417bfd6b2af9beacb104f8659aea8bff94a72. If newer commits cause problems, check out the following revision:
```
$ cd openauto
$ git checkout d56417bfd6b2af9beacb104f8659aea8bff94a72
```

Build openauto:

$ cd ~
$ mkdir openauto_build
$ cd openauto_build
$ sudo apt-get install -y libtag1-dev libblkid-dev
$ cmake -DCMAKE_BUILD_TYPE=Release -DRPI3_BUILD=TRUE -DAASDK_INCLUDE_DIRS="/home/pi/aasdk/include" -DAASDK_LIBRARIES="/home/pi/aasdk/lib/libaasdk.so" -DAASDK_PROTO_INCLUDE_DIRS="/home/pi/aasdk_build" -DAASDK_PROTO_LIBRARIES="/home/pi/aasdk/lib/libaasdk_proto.so" ../openauto
$ make

Replace the Crankshaft distribution binary with the compiled one:

$ sudo cp /home/pi/openauto/bin/autoapp /usr/local/bin/autoapp

Disable the DEV mode from step 1 and boot normally.