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.
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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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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.

Bug – Nix doesn’t give correct payment for Spellbound

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. This is accomplished by incentivizing their clientele to wager offsetting amounts on all potential outcomes of the event. This determination does not have to be 100% rock solid, as it only comes into play when nix expression writers make a mistake.

Chapter 11. Fetchers

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.
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?
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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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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How to Learn Nix, Part 32:Builders

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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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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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.
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• I think as soon as you introduce nix-shell -p, you gotta introduce mkShell right after it.
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• What’s runtimeShell?
• 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?
• 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.

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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.