This repository contains scripts used to build a customised EV3 image containing Sling and Sinter.

If you want to know exactly how the build process works, read the GitHub workflow.

In a nutshell:

• build_control_panel.sh: Cross-compiles the service_control binary to manage Source-Academy related services and settings directly from the EV3
• build_sling.sh: Cross-compiles Sling and Sinter for ARM using ev3dev's cross-compilation Docker image ev3dev/debian-stretch-cross, with some additional dependencies added in Dockerfile.sling
• build_qrcode.sh: Cross-compiles the show_qrcode binary to display the QR code of the device secret on the EV3 screen
• build_uuidtob62.sh: Cross-compiles the uuidtob62 CLI utility to represent the device secret in a more compact format
• build_image.sh: Builds the EV3 root filesystem using image/Dockerfile and image/bootstrap.sh, and then uses Brickstrap to build the final image

To run this locally:

• You must be on Linux.
• You need a static build of QEMU configured for user-mode ARM emulation. It must be registered to handle ARM ELF files using binfmt_misc.
• You need libguestfs tools.
• To satisfy the above dependencies:
  • On Ubuntu, install libguestfs-tools qemu-user-static binfmt-support.
  • On Arch, install binfmt-qemu-static qemu-user-static-bin libguestfs. (Note, the first two are AUR packages.)
• Download brickstrap.sh to the current directory.

To build the image from the source code, make sure you are the the root of the repository, then run the following commands in order:

wget https://raw.githubusercontent.com/ev3dev/brickstrap/master/src/brickstrap.sh
./build_control_panel.sh
./build_sling.sh
./build_qrcode.sh
./build_uuidtob62.sh
./build_image.sh