*> Not really Nix is not a tool, it’s a toolkit for making your own tools. Very

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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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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• 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?
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• Looking through packages that use it, they all feel pretty… heavy.

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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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.
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. 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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• Seems like functions to create Snapcraft… snaps.
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• I do it by running man bash and then /    set.
• I only know that fetchurl returns a derivation because I read the source of fetchurl.
• See, but the “fetchers” are also functions that help with building derivations, but you never said that.

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.
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.
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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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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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.
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.
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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