This repository contains a set of different scripts and GitHub Action workflow files, that are used to build a custom Alpine Linux rootfs, used by the octo4a app.

It also builds proot, and includes it alongside the bootstrap archive. Proot is used to chroot into the rootfs on the Android device.

• scripts/alpine-make-rootfs.sh - modified version of alpine-make-rootfs, used to build a custom version of the alpine-linux bootstrap, with Octoprint and necessary dependencies contained inside. The original script was altered to support multiple architectures.

• scripts/build-talloc.sh - Statically builds the talloc allocator, using Android NDK. Talloc is a dependency of proot.

• scripts/build-proot.sh - Statically builds proot (from external/proot) using Android NDK.

• scripts/build-ioctl-hook.sh - Builds the src/ioctlHook.c, which is used to LD_PRELOAD and override a few ioctls needed by octo4a.

• scripts/run-android-bootstrap.sh - Bootstrap's entrypoint script, included as part of the built bootstrap. Executes proot with necessary binds and other parameters.

• scripts/setup-alpine-rootfs.sh - Ran during the bootstrap's build process - performs installation of OctoPrint, and setups necessary dependencies inside of the bootstrap.