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.
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.
How to Learn Nix, Part 32:Builders
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- These are good functions.
- But it seems that Nixpkgs has quite a lot of functions if you are inclined to use them.
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.
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.
Vigorish
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.
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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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Chapter 12. Trivial Builders
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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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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I don’t really understand what this nix bet comment means. But the manual has never mentioned it before. Then we have runCommandCC, which puts cc in your environment.
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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.
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A Dockerfile says “run this command and then that command, in that order, to build the environment.” A Nix configuration says “Here is what the environment is supposed to look like, go make it so.” If you want to prickle the hackles on a Nix devotee, say “Why don’t you just use Docker? Docker is the insufficient cure to the software dependency disease. A tricky part is that people might refer to all of these things, or some of them, or just one at a time, as “Nix”. Again, all it means is that what you put in (the description of what your environment should look like) is exactly what you get out.
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This post is part of the series How to Learn Nix, a rambling diary in which I work my way through the Nix manual in excrutiating detail. For comparison, for over round calculation only the upper part of the equation is used, leading to slightly higher percentage results than the vigorish calculation. No consistent definition of the percentage a bettor pays due to vigorish can be made without first defining the bettor’s behavior under juiced odds and assuming a win-percentage for the bettor. This direct betting approach implies that both parties accept the counterparty risk, acknowledging the possibility that the losing party may not honor the payment upon the event’s conclusion, a risk typically mitigated by a bookmaker through the payment of vigorish. It is simplest to assume that vigorish is factored in proportionally to the true odds, although this need not be the case.
