this post was submitted on 13 Jan 2025
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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 can be made to be by pinning various things which are not by default.
What things?
At the surface, you can pin the commit you pull packages from, but if you want to go deeper, you can essentially define your own channel and dependent binaries, allowing you to store every aspect of how a generation is built.
Yes, or use flakes which gives you a lockfile pinning everything. But this is related to reproducibility, not immutability.
If you control everything in the build it is, and every generation is immutable.
Isn't immutability related to the root filesystem being read-only? I can write on my root filesystem, even if it's mostly links to the store I can replace those links.
I guess that's true, tbh the reproducibility aspect is really what I like about nix, and I guess I'm confusing a bit here. I guess I'm saying nix gives a good compromise with immutable generations and high repro, but you've convinced me it's not immutable per-se.
Well in the end I think I'm needlessly nitpicking. It doesn't matter if it's strictly immutable or not. What matter is that it has the good parts of reproducibility, immutability and declarativity.