*> Not really Nix is not a tool, it’s a toolkit for making your own tools. Very

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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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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.
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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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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Chapter 12. Trivial Builders

Nix is a set of tools for helping you configure your software environment exactly the same way every time. On Mondays, players can grab a 20% reload bonus + 20 free spins with just a €20 deposit. The second deposit nets you a 50% bonus up to €300 + 30 free spins, this time playable on Big Bass Bonanza. 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. This is the first time it’s come up in the manual.
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• Looking through packages that use it, they all feel pretty… heavy.
• 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?
• Over round occurs when the sum of the implied probabilities for all possible event results is above 100%, whereas the vigorish is the bookmaker’s percentage profit on the total stakes made on the event.
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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 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.
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.
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New casino players are welcomed with a three-part deposit bonus, starting with a 75% match up to €200 + 50 free spins. It is not documented anywhere in the nixpkgs manual – the only occurrence of the string runtimeShell is in a couple of code examples. Nixpkgs comes with a few helper functions that allow you to fetch fixed-output derivations in a structured way.
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.
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More generically, vigorish can refer to the bookmaker/casino’s theoretical advantage from all possible wagers on any game they offer. Most nix expression writers would never need to know about this change at all, as they simply use nixpkgs fetchers, and those could implement this internally. That said, these days people are developing their software in cloud environments that need special automation, and the overall increase in sophistication of software infrastructure teams suggests that maybe Nix has brighter days ahead. 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. If you have ever tried to update Python on your Macbook, you know how easy it is to end up with a nasty dirty developer environment full of broken packages of unknown origin.
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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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