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Why I Left NixOS for Ubuntu
(fd93.me)
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this post was submitted on 02 May 2024
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NixOS is a reproducible OS. I wouldn't call it immutable.
It's not really fully reproducible either.
Isn't it fully reproducible with flakes?
Nope, nix doesn't ensure or require that the builds are deterministic. It's not any better in that regard than other package managers.
Pin package version and --pure?
That should already allow it to be ahead of other PMs.
A package is reproducible if you use the same inputs, run the build, and get the same outputs.
The issue is that the build can produce different outputs given the same inputs. So you need to modify the build or patch the outputs. This is something that is being worked on by most distributions: https://reproducible-builds.org/who/projects/
NixOS is not special in that regard nor are all NixOS packages reproducible.