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update nix.md

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tezlm 2024-08-18 03:34:42 -07:00
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commit 25055b1fcc
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@ -156,10 +156,13 @@ derivation {
system = builtins.currentSystem; system = builtins.currentSystem;
} }
``` ```
<div class="eval">= derivation «/nix/store/ha5hof1nput-foobar.drv»</div> <div class="eval">= derivation «/nix/store/119h84n7a58069l5zi0rgs7q06rhrlh3-foobar.drv»</div>
To build this, use `:b (copy-pasted code)` in the repl. It should print This code outputs a hash-based path to a derivation, nix's version of a
a path to the build outputs. build script. Derivations *derive* build outputs from build inputs. To
build the derivation, use `:b (copy-pasted code)` in the repl. It should
print a path to the build outputs. If you `cat` the output, you should
get back "Hello, derivation!".
[NixOS/nixpkgs](https://github.com/NixOS/nixpkgs) is a combination package [NixOS/nixpkgs](https://github.com/NixOS/nixpkgs) is a combination package
repository and standard library, containing thousands of derivations and repository and standard library, containing thousands of derivations and
@ -178,24 +181,24 @@ will *always* produce the same outputs. If it works on one nix user's
machine, it will work every nix user's machine. If a build fails, it machine, it will work every nix user's machine. If a build fails, it
fails for everyone. fails for everyone.
Flakes work by taking in an explicit set of inputs along with the build Nix flakes are a new tool that makes the inputs explicit as well, instead
steps. Anything that isn't explicitly defined as an input, whether of only the build steps. Anything that isn't explicitly defined as an
it's binaries, paths, or environment variables, is not given to the input, whether it's binaries, paths, or environment variables, is not
derivation's builder. given to the derivation's builder. Here's an example flake:
Here's an example flake:
```nix ```nix
{ {
description = "any useful description here"; description = "any useful description here";
inputs = { inputs = {
# this is a flake identifier # Inputs take in flake references
# https://nix.dev/manual/nix/2.18/command-ref/new-cli/nix3-flake#flake-references
nixpkgs.url = "github:NixOS/nixpkgs"; nixpkgs.url = "github:NixOS/nixpkgs";
}; };
outputs = { self, nixpkgs }: { outputs = { self, nixpkgs }: {
packages.x86_64-linux.default = inputs.nixpkgs.legacyPackages.x86_64-linux.hello; # reuse an existing derivation for simplicity
packages.x86_64-linux.default = nixpkgs.legacyPackages.x86_64-linux.hello;
}; };
} }
``` ```
@ -222,8 +225,14 @@ another flake:
packages.x86_64-linux.default = pkgs.stdenv.mkDerivation { packages.x86_64-linux.default = pkgs.stdenv.mkDerivation {
name = "hello"; name = "hello";
src = self; src = self;
buildPhase = "echo '#!/bin/sh\necho hello world' > bin; chmod +x bin"; buildPhase = ''
installPhase = "mkdir -p $out/bin; mv bin $out/bin/hello"; echo '#!/bin/sh\necho hello world' > bin
chmod +x bin
'';
installPhase = ''
mkdir -p $out/bin
mv bin $out/bin/hello
'';
}; };
}; };
} }