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pages/Tech/NixOS/Recover from `nixos-rebuild test` without a reboot.md

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+created:: 2024-01-26T15:43:17 (UTC -05:00)
+tags:: nixos
+source:: https://serverfault.com/questions/890886/recover-from-nixos-rebuild-test-without-a-reboot
+author:: aij
+20311 silver badge77 bronze badges
+
+- Recover from `nixos-rebuild test` without a reboot - Server Fault
+    
+    > ## Excerpt
+    > Is there a way to revert to the previous (or at least "current") configuration after nixos-rebuild test without rebooting?
+    
+    Per the nixos-rebuild manual:
+    
+     test
+         Build and activate the new
+    
+    ---
+    ```
+    # List previous generations
+    sudo nix-env --list-generations -p /nix/var/nix/profiles/system
+    
+    # Live switch to any generation
+    sudo nix-env --switch-generation 12345 -p /nix/var/nix/profiles/system
+    sudo /nix/var/nix/profiles/system/bin/switch-to-configuration switch
+    ```
+    
+    Source: [https://github.com/NixOS/nixpkgs/issues/24374](https://github.com/NixOS/nixpkgs/issues/24374)