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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.
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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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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 am also assuming that it’s run with the same PATH that source $stdenv/setup would give you.
• 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.

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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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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• So I could have used that to declaratively create my own user environment, if fate had not presented me the much simpler way.
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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.
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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.

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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.
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 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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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.
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.