this post was submitted on 18 Feb 2024
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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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By not being a universal packaging format. It uses your system libraries, which completely eliminates the main reason devs are pushing for things like Flatpak, Snap, or Appimage.
It doesn't use the system libraries, unless the system in question is NixOS. It still provides its own dependencies. Arguably in a more elegant and less wasteful manner, but they are still distinct from the ones used by the rest of the system.
EDIT: typo
To be more clear, it uses a weird combination of your system libraries, installing its own libraries into your system on its own without informing your primary package manager, and using some specific library versions separate from your system libraries for some apps.
If you want to call that more "elegant" than other solutions... Well, I can't tell you how to feel about something. It still doesn't actually solve the problem that universal package formats are trying to solve unless the package dev explicitly requires so many specific library versions that the whole thing just ends up being an AppImage with extra steps though.
The packager always should "explicitly require" what are the dependencies in a Nix package... it's not like it's a choice, if there are missing dependencies then that'd be a bug.
If the package is not declaring its dependencies properly then it might not run properly in NixOS, since there are no "system libraries" in that OS other than the ones that were installed from Nix packages.
And one of its advantages over AppImages is that instead of bundling everything together causing redundancies and inefficient use of resources, you actually have shared libraries with Nix (not the system ones, but Nix dependencies). If you have multiple AppImages that bundle the same libraries you can end up having the exact same version of the library installed multiple times (or loaded in memory, when running). Appimages do not scale, you would be wasting a lot of resources if you were to make heavy use of them, whereas with Nix you can run an entire OS built with Nix packages.