Bypass store object reuse when FODs change source description Issue #7999 NixOS nix

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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.

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• It will in fact fail to instantiate when invoked with nix-build.
• 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.

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.
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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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.
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.
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.
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.

Bypass store object reuse when FODs change source description #7999

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.
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.

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

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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.
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 nix bet the executable bit set.” So maybe this takes a map? The manual hardly says anything, actually.

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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.
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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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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