Add daily email for 2025-01-21

Making ddev reproducible

source/_daily_emails/2025-01-21.md

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+---
+title: Making ddev reproducible
+date: 2025-01-21
+permalink: daily/2025/01/21/ddev
+tags:
+  - software-development
+  - drupal
+  - ddev
+cta: ~
+snippet: |
+  How to use Nix to make DDEV reproducible.
+---
+
+I sometimes work on projects that already has an existing environment configuration, usually using a tool like DDEV.
+
+Similar to using Nix, DDEV makes environments more consistent by standardising versions of PHP, nodejs, etc for each project.
+
+This is great, but how do you know everyone has the same version of DDEV?
+
+Different people having different versions of DDEV could introduce its own issues and bugs, such as pulling different images with different default package versions.
+
+## Enter Nix
+
+The Nix package manager has over 100,000 packages, including DDEV.
+
+This means I can install DDEV via Nix and because of the flake.nix file, anyone using the same configuration will get the same version of DDEV.
+
+Here's a simple `flake.nix` file to install DDEV:
+
+```nix
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs =
+    { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = with pkgs; [ ddev ];
+      };
+    };
+}
+```
+
+This approach also means I can have different versions of DDEV installed at once so I can use different versions for different projects as needed.
+
+I also don't need it installed globally, so this only makes it available to the projects that need it.
+
+It's a bit meta, but it works.