Make default shell to zsh

Author: arctan95

.config/home-manager/home.nix

@@ -1,4 +1,4 @@
-{ config, userConfig, pkgs, ... }:
+{ config, userConfig, pkgs, lib, ... }:
 
 {
   home.username = builtins.getEnv "USER";
@@ -21,6 +21,23 @@
 
   home.sessionVariables = userConfig.env;
 
+  # Set zsh as default shell on activation
+  home.activation.make-zsh-default-shell = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    # if zsh is not the current shell
+      PATH="/usr/bin:/bin:$PATH"
+      ZSH_PATH="/home/${builtins.getEnv "USER"}/.nix-profile/bin/zsh"
+      if [[ $(getent passwd ${builtins.getEnv "USER"}) != *"$ZSH_PATH" ]]; then
+        echo "Setting zsh as default shell..."
+        if ! grep -q $ZSH_PATH /etc/shells; then
+          echo "Adding zsh to /etc/shells"
+          run echo "$ZSH_PATH" | sudo tee -a /etc/shells
+        fi
+        echo "Running chsh to make zsh the default shell"
+        run chsh -s $ZSH_PATH ${builtins.getEnv "USER"}
+        echo "Zsh is now set as default shell!"
+      fi
+  '';
+
   # Let Home Manager install and manage itself.
   programs.home-manager.enable = true;