I did it multiple times in past in a few companies where I worked on various Linux based network security appliances. Using standard Linux distros on them is pr

I did it multiple times in past in a few companies where I worked on various Linux based network security appliances. Using standard Linux distros on them is problematic for various reasons. So I developed my own build system, which probably looked somewhat like Nix for building the distribution and managing updates. LFS was great place to start with