this post was submitted on 16 Oct 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It all began with Nix software build system and package manager; they needee a way to build, compile software in a reproducible way. That is, if it builds on my machine, it should build on yours too given some constraints. Then they build a whole package repository for such sofware or package definitions, Nixpkgs, that can be build or retrieved using Nix package manager. Nixpkgs grew to be a repository for enabling runnig an GNU Linux OS on it: NixOS. It is declarative in the sense you write what it should contain like packages and behaves like system services. For example, see https://git.sr.ht/~misterio/nix-config.
Atomic in the sense that when you want to change system's configuration or state, everything should suceed in that update, otherwise fails; it is everything or nothing. This enables storing previous and current system revisions, so can rollback to previous state.
Nix plus things like flakes, nix shell, enables a build inviroment akin to containers, but much better, correct, and flexible.
Haskell is just an ecossytem Nixpkgs support.
Basically all that. The unfinished part IMO is mostly for use in developer use cases, and that some ecosystems like JVM are not as well supported.
Can run yes, given that you have to spend some time learning Nix and NixOS specifics. I do that myself.
You either package the software if it is easy to do so—take a look a at nix-init which eases the process—or use Flatpack, containers, steam-run...
I like that, I'd describe the documentation as a POC. It fits.