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.
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.
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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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- 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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- It is not documented anywhere in the nixpkgs manual – the only occurrence of the string runtimeShell is in a couple of code examples.
- It’s essentially a hybrid of floating ca and fixed-output derivations.
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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 nix bet 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.
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.
But the manual doesn’t say that. The manual says that it writes a text file. I don’t believe that.
- 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.
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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.
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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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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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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.