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8afee98203
This does not yet follow #701, because the change to get there would be too big. The goal is to keep the table of contents meaningful at all times and the diff of each pull request manageable. The packaging tutorial is quite important, so it's not wrong to have it visible on the front page until we have enough material for a packaging section. The sharing dependencies article should really be a very brief guide, but because that would be quite a big change, it's only moved to the Guides section for now.
1.6 KiB
1.6 KiB
(direnv)=
Automatic environment activation with direnv
Instead of manually activating the environment for each project, you can reload a declarative shell every time you enter the project's directory or change the shell.nix inside it.
For example, write a shell.nix with the following contents:
let
nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-22.11";
pkgs = import nixpkgs { config = {}; overlays = []; };
in
pkgs.mkShell {
packages = with pkgs; [
hello
];
}
From the top-level directory of your project run:
$ echo "use nix" > .envrc && direnv allow
The next time you launch your terminal and enter the top-level directory of your project, direnv will automatically launch the shell defined in shell.nix
$ cd myproject
$ which hello
/nix/store/1gxz5nfzfnhyxjdyzi04r86sh61y4i00-hello-2.12.1/bin/hello
direnv will also check for changes to the shell.nix file.
Make the following addition:
let
nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-22.11";
pkgs = import nixpkgs { config = {}; overlays = []; };
in
pkgs.mkShell {
packages = with pkgs; [
hello
];
+
+ shellHook = ''
+ hello
+ '';
}
The running environment should reload itself after the first interaction (run any command or press Enter).
Hello, world!