Use a slightly uglier but more reliable way of determining GRUB_CMDLI…

…NE_LINUX_DEFAULT.

roles/grubcmdline/tasks/main.yml

@@ -15,16 +15,19 @@
   changed_when: old_cmdline != kernel_cmdline | select() | sort | list
   notify: "{{ kernel_restart_handler }}"
 
-- name: Slurp /etc/default/grub
-  ansible.builtin.slurp:
-    path: /etc/default/grub
-  register: grub_result
-  become: true
-
-- name: Set fact containing GRUB_CMDLINE_LINUX_DEFAULT
+- name: Look for the last occurance of GRUB_CMDLINE_LINUX_DEFAULT in grub config
+  # In some environments, the grub config contained multiple lines defining this
+  # value; the last one would "win", but the change in this play would be based
+  # on the first one that was found, with interesting consequences. Hence this
+  # slightly less pure but more reliable way of fetching that line.
+  ansible.builtin.shell:
+    cmd: >-
+      grep -E '^GRUB_CMDLINE_LINUX_DEFAULT' /etc/default/grub | tail -1
+  register: grub_cmdline_linux_default
+- name: Set fact containing the contents of GRUB_CMDLINE_LINUX_DEFAULT
   ansible.builtin.set_fact:
     grub_cmdline_linux_default: >-
-      {{ grub_result.content | b64decode | regex_search('^GRUB_CMDLINE_LINUX_DEFAULT.*$', multiline=True) | regex_replace('^GRUB_CMDLINE_LINUX_DEFAULT="(.*)"$', '\1') }}
+      {{ grub_cmdline_linux_default.stdout | regex_search('^GRUB_CMDLINE_LINUX_DEFAULT.*$', multiline=True) | regex_replace('^GRUB_CMDLINE_LINUX_DEFAULT="(.*)"$', '\1') }}
 - name: Display GRUB_CMDLINE_DEFAULT
   ansible.builtin.debug:
     var: grub_cmdline_linux_default