Determine root filesistem device and partition before running growpart (#8024)

roles/kubernetes/preinstall/tasks/0120-growpart-azure-centos-7.yml

@@ -7,8 +7,17 @@
     name: cloud-utils-growpart
     state: present
 
+- name: Search root filesystem device
+  vars:
+    query: "[?mount=='/'].device"
+    _root_device: "{{ ansible_mounts|json_query(query) }}"
+  set_fact:
+    device: "{{ _root_device | first | regex_replace('([^0-9]+)[0-9]+', '\\1') }}"
+    partition: "{{ _root_device | first | regex_replace('[^0-9]+([0-9]+)', '\\1') }}"
+    root_device: "{{ _root_device }}"
+
 - name: check if growpart needs to be run
-  command: growpart -N /dev/sda 1
+  command: growpart -N {{ device }} {{ partition }}
   failed_when: False
   changed_when: "'NOCHANGE:' not in growpart_needed.stdout"
   register: growpart_needed
@@ -16,16 +25,16 @@
     LC_ALL: C
 
 - name: check fs type
-  command: file -Ls /dev/sda1
+  command: file -Ls {{ root_device }}
   changed_when: False
   register: fs_type
 
 - name: run growpart  # noqa 503
-  command: growpart /dev/sda 1
+  command: growpart {{ device }} {{ partition }}
   when: growpart_needed.changed
   environment:
     LC_ALL: C
 
 - name: run xfs_growfs  # noqa 503
-  command: xfs_growfs /dev/sda1
+  command: xfs_growfs {{ root_device }}
   when: growpart_needed.changed and 'XFS' in fs_type.stdout