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.
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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.
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.
How to Learn Nix, Part 32:Builders
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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- 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.
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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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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.
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 nix bet over time.
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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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- But these are not the only functions in trivial-builders.nix.
- Bring it with you on a plane sometime.
- Docker is the insufficient cure to the software dependency disease.
- 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)…
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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.
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.
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.
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.
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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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.