M #-: Assert that fstab config matches existing filesystems (fix)

roles/helper/fstab/tasks/main.yml

@@ -3,7 +3,7 @@
   ansible.builtin.package:
     name: "{{ (_common + _specific[ansible_os_family]) | select }}"
   vars:
-    _common: []
+    _common: [util-linux]
     _specific:
       Debian:
         - "{{ 'nfs-common' if ('nfs' in _fstypes) else None }}"
@@ -21,6 +21,30 @@
   retries: 12
   delay: 5
 
+- name: Assert that fstab config matches existing filesystems
+  ansible.builtin.shell:
+    cmd: |
+      set -o errexit
+      FAILED=false
+      {% for v in _fstab %}
+      if TYPE="$(blkid -o value -s TYPE '{{ v.src }}')"; then
+        if [[ "$TYPE" != '{{ v.fstype | d('nfs') }}' ]]; then
+          echo "Filesystem type on device '{{ v.src }}' does not match requested fstab config ('$TYPE' != '{{ v.fstype | d('nfs') }}')." >&2
+          echo 'Please consider fixing this problem manually before continuing.' >&2
+          FAILED=true
+        fi
+      fi
+      {% endfor %}
+      if [[ "$FAILED" == true ]]; then
+        exit 1
+      fi
+    executable: /bin/bash
+  when: _fstab | count > 0
+  vars:
+    _fstab: >-
+      {{ fstab | d([]) | selectattr('src', 'defined') }}
+  changed_when: false
+
 - name: Add to fstab and mount filesystems
   ansible.posix.mount:
     src: "{{ item.src }}"