Pulling Linux up by its bootstraps

The live-bootstrap project, initiated in 2020 by Samuel Tyler, aims to automate the complete bootstrapping of a modern Linux system without relying on an existing kernel. In 2023, the Guix project reduced its binary bootstrap seed to 357 bytes, while live-bootstrap has eliminated the need for an existing kernel entirely. The project utilizes a minimal kernel called Builder-Hex0, which is small enough to be manually verified and runs shell scripts to guide the bootstrapping process. The automation allows for testing as new software is integrated. The bootstrapping process involves cloning the project's Git repository or downloading a release tarball, followed by using a tool called rootfs.py to manage the build in various environments. The process builds older versions of software, ultimately leading to the construction of a minimal Linux user space with modern tools. The significance of bootstrappable builds lies in enhancing user confidence in binary packages and ensuring the longevity of software ecosystems by providing a self-contained method to build software from a small seed. This approach addresses concerns about trusting software compilers and contributes to the reproducibility of builds, making it less likely for malicious backdoors to persist unnoticed.

- The live-bootstrap project automates the bootstrapping of Linux without needing an existing kernel.

- Builder-Hex0 is a minimal kernel that facilitates the initial bootstrapping process.

- The project enhances confidence in binary packages and addresses software longevity.

- Bootstrappable builds help mitigate risks associated with trusting software compilers.

- The process involves building older software versions to create a modern Linux user space.