How to Learn Nix, Part 32: Builders

But I assume, based on that note, that it’s not going to work on my mac. But NixOS does not adhere to this convention, and thus packages that expect it will probably be disappointed. This is a convention that some Linuxes adhere to, and some packages expect.

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That can’t be the right way to find documentation, but it’s what I’ve always done. Searching for “set” gives thousands of results, but searching for “    set” only gives a few irrelevant results before you find the one you want. I do it by running man bash and then /    set. I honestly don’t know the right answer. So if you’re curious what it does, you need to find the documentation for the set builtin. Man bash does not document -n as a flag, because it seems -n is short for set -n before the script.

• The only other thing it says is “You can also set executable to true to make this file have the executable bit set.” So maybe this takes a map?
• Looking through packages that use it, they all feel pretty… heavy.
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• Pkgs.mkShell is a special kind of derivation that is only useful when using it combined with nix-shell.
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Nowhere in any of those chapters did the manual say something like “Hey, fetchurl returns a derivation,” which is an insight that I find very important. Pkgs.mkShell is a special kind of derivation that is only useful when using it combined with nix-shell. There’s another function called linkFarm, undocumented in the manual, which operates like symlinkJoin, but provides a different output structure. But these are not the only functions in trivial-builders.nix. These paths can be to Nix store derivations or any other subdirectory contained within.
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But the manual doesn’t say that. The manual says that it writes a text file. I don’t believe that.
But those who persevere—interesting software shops like Replit and Shopify—choose Nix for a good reason. Nixpkgs also partially solves sbom topics, enables monkey patching any linux application/kernel/ffi dependency, has the freshest collection of packages (it’s more fresh than archlinux by a major factor) whilst all being under CI/CD (shamefully rare in linux land) In the last few years, Nix has gone from a place where I was sometimes uncomfortable recommending it to people to one where I feel like it would be unstrategic not to use it where it fits.
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At this stage nix is a damn safe bet because of what it can do, the problems it solves and the size of community. Yeah nix wants to grow, and it is, largest bazaar GitHub community/repo out there right now. The Nix language server should have autocomplete, searches and interacting with the language should be easy, etc. and nearly everyone needs to hunt for packages, even if they’re not “installing” them – they might be needed for the toolchain. So can anyone send me their configuation.nix (preferably not a home-manager file and preferably for a laptop with no GPU) with a Hyprland configuation, so I can follow? Consult your local online gambling laws before you join the casino.

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This can be used to put many derivations into the same directory structure. This one feels pretty unnecessary to me, but rg tells me that it’s used a ton in the nixos/ subdirectory, and in a couple places elsewhere. It’s weird that we don’t just… it’s weird that we passAsFile and then mv. It doesn’t just disable downloading the output of this derivation – as I would have expected – but also all of its dependencies? It seems like something I should use, when writing my own derivations, when I do not actually depend on cc (which I almost always will not). I am also assuming that it’s run with the same PATH that source $stdenv/setup would give you.
This would the perfect place to explain how these fetchers work, though, so let’s see if the manual does that. I only know that fetchurl returns a derivation because I read the source of fetchurl. Now, I could update my understanding of the term derivation based on this new information, but I’m not going to. I’ve simply been busy, and finding myself less intrinsically motivated to read the Nixpkgs manual than I was when I was reading the Nix manual.
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Also, it’s sort of confusing to use the term “building derivations.” I take it here to mean, like, constructing derivations. See, but the “fetchers” are also functions that help with building derivations, but you never said that. Nixpkgs provides a couple of functions that help with building derivations. Or to be persnickety about the language, they evaluate to fixed-output derivations.
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