update

roles/nix/tasks/main.yml

@@ -1,4 +1,5 @@
 
+---
 - name: Get nix version
   shell: |
     . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
@@ -8,7 +9,7 @@
   register: nix_version_output
 - name: Set nix version name
   set_fact:
-    nix_version_on_system: "{{ nix_version_output.stdout_lines[0] | cut -d' ' -f3 }}"
+    nix_version_on_system: "{{ (nix_version_output.stdout_lines[0] | split(' '))[2] }}"
   when: nix_version_output.rc == 0
 - name: Download and run installer
   block: