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NixOS Reproducible Builds: minimal installation ISO successfully independently rebuilt
(discourse.nixos.org)
From Wikipedia, the free encyclopedia
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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In general nix packages are not reproducible in the sense that the output will be bit-for-bit identical. When a package is built on two different machines, nix will run the same commands, with the same environment variables, using identical inputs (e.g. source tarballs). However there are various ways build systems, compilers etc can still be non-deterministic, and this effort is about fixing that.
A large amount aren't but, OTOH, a large amount also are because Nix does almost everything it can to set up an environment without easily preventable sources of non-determinism such as general filesystem access, networking or other means of communication with some uncontrolled system.
Reading this thread I am even more confused about Linux in general.
If you have questions, feel free to ask.