How to Learn Nix, Part 32: Builders

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.

Chapter 12. Trivial Builders

  • And I don’t know how to write a shell.nix equivalent of nix-shell -p souffle, so I just run that command every time and feel weird about it.
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  • I don’t really understand what this comment means.
  • Specifically, software dependencies.

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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I don’t recall mkDerivation treating buildCommand as some special argument. 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. For example it will remove comments or other unstable parts that are sometimes added by version control systems and can change over time.
All those things your code needs to run are dependencies and collectively they are known as your software environment. The biggest reason Nix is still a niche technology, rather than the One True Way that we manage our software packages, is that most professional software engineers who take one look at Nix say “Dear God, no. For regular players, it’s €5,000 per week and €20,000 per month.
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.
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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.
This one isn’t documented in the manual, but it seems pretty useful. Much better documentation than the manual. 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? The manual hardly says anything, actually.
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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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.

  • I asked ChatGPT to give me an analogy comparing Nix and Docker, and it said if your software is a sandwich, Nix is like a recipe and Docker is like a lunchbox.
  • And at the time Eelco was writing his dissertation in the early 2000s there was not really a great way to ensure this.
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  • Plus, stacking Docker images on top of each other quickly leads to duplicated packages, whereas Nix hashes references to everything in the environment to avoid duplication.
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Bypass store object reuse when FODs change source description #7999

It will in fact fail to instantiate when invoked with nix-build. I wanted to write a shell.nix file, and that’s how I did it. On March 17 I tried to make a nix-shell for my Drinking with Datalog post. But I haven’t been writing a blog post every time I did anything with Nix – although I do mean to. 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. Looking through packages that use it, they all feel pretty… heavy.

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Similarly, it’s important to modify the various prefetching commands to produce the relevant nix database associations, so that the fetchers they are meant to be compatible with will reuse the prefetched objects without complaint. If this field is not specified, then no entry is produced in the nix database, nor are the existing ones checked, just like the current behavior. Nix can throw away the result of the FOD, and reuse the existing store path, but only after running it to verify that it does produce an output with the same hash as what is already present. Bring it with you on a plane sometime. I asked ChatGPT to give me an analogy comparing Nix and Docker, and it said if your software is a sandwich, Nix is like a recipe and Docker is like a lunchbox.
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.
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.
But the manual doesn’t say that. The manual says that it writes a text file. I don’t believe that.

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