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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.

• It will in fact fail to instantiate when invoked with nix-build.
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• Which is unfortunate, because I don’t think that anywhere in the preceding thousands of words of manual has this actually been spelled out.
• Instead, this incredibly useful thing is hidden in this weird “Special Builders” chapter of the Nixpkgs manual.
• 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.
• Creating derivations.
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Chapter 12. Trivial Builders

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.
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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Chapter 11. Fetchers

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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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But the manual doesn’t say that. The manual says that it writes a text file. I don’t believe that.
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Bug – Nix doesn’t give correct payment for Spellbound

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.
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At this stage nix is a damn safe bet because of what it can do, the problems it solves and the size of community. Yeah nix wants to grow, and it is, largest bazaar GitHub community/repo out there right now. The Nix language server should have autocomplete, searches and interacting with the language should be easy, etc. and nearly everyone needs to hunt for packages, even if they’re not “installing” them – they might be needed for the toolchain. 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? Consult your local online gambling laws before you join the casino.

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• The manual says that it writes a text file.
• 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.
• 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.
• Yeah nix wants to grow, and it is, largest bazaar GitHub community/repo out there right now.
• 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.”
• It’s important enough information that it should be in the Nix manual, not buried in the Nixpkgs manual.

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.
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.

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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.
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.
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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.