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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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.
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.

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

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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 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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• I don’t believe that.
• The manual hardly says anything, actually.
• On March 17 I tried to make a nix-shell for my Drinking with Datalog post.
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• So if you’re curious what it does, you need to find the documentation for the set builtin.
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• Much better documentation than the manual.

Also, it’s sort of confusing to use the term “building derivations.” I take it here to mean, like, constructing derivations. See, but the “fetchers” are also functions that help with building derivations, but you never said that. Nixpkgs provides a couple of functions that help with building derivations. Or to be persnickety about the language, they evaluate to fixed-output derivations.
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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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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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