Fix lvm grub (#23)

* reinstall Grub if /boot on LVM

* changelog

changelogs/fragments/fix-lvm-grub.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - Grub needs reinstall if /boot is on LVM

roles/lvm_snapshots/tasks/revert.yml

@@ -24,6 +24,24 @@
 - name: Reboot
   ansible.builtin.reboot:
 
+- name: Check if /boot is on LVM
+  ansible.builtin.command: "grub2-probe --target=abstraction /boot"
+  changed_when: false
+  failed_when: false
+  register: boot_abstraction
+
+- name: Reinstall Grub to boot device
+  when: boot_abstraction.stdout == 'lvm'
+  block:
+  - name: Get boot device
+    ansible.builtin.shell: "lsblk -spnlo name $(grub2-probe --target=device /boot)"
+    changed_when: false
+    register: boot_dev_deps
+
+  - name: Run grub2-install
+    ansible.builtin.command: "grub2-install {{ boot_dev_deps.stdout_lines | last }}"
+    changed_when: true
+
 - name: Remove boot backup
   ansible.builtin.file:
     path: "/root/boot-backup-{{ lvm_snapshots_set_name }}.tgz"