fix: make Ansible reruns faster and idempotent

ansible/roles/common/tasks/main.yml

@@ -45,9 +45,16 @@
     state: present
     lock_timeout: 600
 
+- name: Check active swap
+  command: swapon --noheadings
+  register: active_swap
+  changed_when: false
+  failed_when: false
+
 - name: Disable swap
   command: swapoff -a
   changed_when: true
+  when: active_swap.stdout | trim | length > 0
 
 - name: Remove swap from fstab
   lineinfile:
@@ -100,9 +107,17 @@
   failed_when: false
   when: tailscale_auth_key | length > 0
 
+- name: Parse tailscale connection state
+  set_fact:
+    tailscale_backend_state: "{{ (tailscale_status.stdout | from_json).BackendState | default('') }}"
+  when:
+    - tailscale_auth_key | length > 0
+    - tailscale_status.rc == 0
+    - tailscale_status.stdout | length > 0
+
 - name: Connect node to tailnet
   command: tailscale up --authkey {{ tailscale_auth_key }} --hostname {{ inventory_hostname }} --ssh={{ tailscale_ssh | ternary('true', 'false') }} --accept-routes={{ tailscale_accept_routes | ternary('true', 'false') }}
   when:
     - tailscale_auth_key | length > 0
-    - tailscale_status.rc != 0 or '"BackendState":"Running"' not in tailscale_status.stdout
+    - tailscale_status.rc != 0 or (tailscale_backend_state | default('')) != 'Running'
   changed_when: true