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.

How to Learn Nix, Part 32:Builders

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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.
My understanding so far is that helpers like fetchurl don’t “fetch” derivations. It’s essentially a hybrid of floating ca and fixed-output derivations. What we all want is REPRODUCIBILITY which means I want to specify EXACTLY what dependencies my software environment needs and I want them to deploy EXACTLY THE SAME WAY every time on every machine. It has a wide range of games from leading providers, enhanced by various casino bonuses that start with the welcome offer. The casino is constantly adding new providers to the list, ensuring that players always get the latest and greatest games.

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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.
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• Then we have runCommandCC, which puts cc in your environment.

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• It’s weird that we don’t just… it’s weird that we passAsFile and then mv.
• I recall passAsFile from part 13 – so the builder will execute with an environment variable called $buildCommand which will be the path to a temporary file.
• Nix wants to help you build your software “without side effects” – that is, without changing other things in your system that you didn’t specify.
• It works by creating a new derivation and adding symlinks to each of the paths listed.
• For regular players, it’s €5,000 per week and €20,000 per month.
• It’s neat to know it exists, but it’s not something I can really imagine myself using, so I will not bother to read through the usage in detail.

This is sometimes referred to as a PURE FUNCTIONAL approach. Nix wants to help you build your software “without side effects” – that is, without changing other things in your system that you didn’t specify. And at the time Eelco was writing his dissertation in the early 2000s there was not really a great way to ensure this. All the little packages that your code imports, plus all the little packages that THEY import, right down to things like the C compiler included with your operating system (OS)… Specifically, software dependencies. The disease is software itself.
Creating derivations. So it seems like nixpkgs.ruby should just depend on that, and that maybe fetchFromSavannah is not 100% pulling its weight here. Which is unfortunate, because I don’t think that anywhere in the preceding thousands of words of manual has this actually been spelled out. They return derivations. I’m still trying to get a handle on the term “derivation,” and I do not like the way that it’s used here.
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I don’t really understand what this comment means. But the manual has never mentioned it before. Then we have runCommandCC, which puts cc in your environment.
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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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These are good functions. So I could have used that to declaratively create my own user environment, if fate had not presented me the much simpler way. Name is the name used in the Nix store path for the created derivation. It works by creating a new derivation and adding symlinks to each of the paths listed. What’s runtimeShell?
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The manual describes support in Nixpkgs for AppImage, Docker, OCI, and Snap images. And I would bet pretty good money that no regular Nix user (as opposed to an aspiring Nixpkgs maintainer) has ever actually read this manual in such detail before. Instead, this incredibly useful thing is hidden in this weird “Special Builders” chapter of the Nixpkgs manual. I think as soon as you introduce nix-shell -p, you gotta introduce mkShell right after it.

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