NixOS is a Linux distribution that is completely and entirely reproducible. Everything you use is defined in a configuration file that is used to build your system. All the services, packages, options, partition layout, hardware, everything, is in this config file.
If you're a developer, your eyes might be sparkling right now: that's right, one config file to exactly replicate your entire development environment.
You also can never get into dependency hell. Packages all declare exactly which versions of each library they need, and these versions are all installed side by side and kept, not erased by newer versions.
NixOS sounds super cool. Has anyone tried it out on a RaspberryPi for a home server? I might try replacing Ubuntu as my home server.
It requires too much fuckery to really do it on RPi. But on x86, it's the most reliable distro I tried. You can even switch stable/unstable branches without running into issues.
What about the Pi makes it a hassle?