Updates to allow Bigboot to decrement from the default target size, down to a minimum threshold of 1GB

tasks/capture_lv_device_details.yml

@@ -42,15 +42,25 @@
     bigboot_lv_info: "{{ ansible_facts.mounts \
       | selectattr('device', 'equalto', bigboot_adjacent_lvm_device) | first }}"
 
-- name: Assert that there is space on the logical volume for shrinkage
-  ansible.builtin.assert:
-    that: bigboot_lv_info.size_available > bigboot_expansion_diff | int
-    fail_msg: There is not enough space available for LV shrinking.
+# - name: Assert that there is space on the logical volume for shrinkage
+#   ansible.builtin.assert:
+#     that: bigboot_lv_info.size_available > bigboot_expansion_diff | int
+#     fail_msg: There is not enough space available for LV shrinking.
+
+- name: Check for available space and fallback if needed
+  ansible.builtin.import_tasks: check_space_fallback.yml
 
 - name: Capture shrink size for logical volume
   ansible.builtin.set_fact:
     bigboot_lv_shrink_size: "{{ bigboot_lv_info.size_total - bigboot_expansion_diff | int }}"
 
+- name: Debug bigboot_lv_shrink_size
+  ansible.builtin.debug:
+    msg: "{{ bigboot_lv_shrink_size | int | human_readable(unit='M') }}"
+
+- name: Kill the play
+  ansible.builtin.meta: end_host
+
 - name: Capture logical volume name
   ansible.builtin.shell:
     cmd: |

tasks/check_space_fallback.yml

@@ -0,0 +1,26 @@
+---
+- name: Fail if /boot can't expand to at least 1GB
+  ansible.builtin.assert:
+    that: bigboot_size_target | human_to_bytes > 1073741824
+    fail_msg: "{{ bigboot_size_target | int | human_readable(unit='M') }} is less than the minimum of 1GB for /boot"
+
+- name: Verify available space and re-check if needed
+  block:
+    - name: Assert that there is space on the logical volume for shrinkage
+      ansible.builtin.assert:
+        that: bigboot_lv_info['size_available'] > bigboot_expansion_diff | int
+        fail_msg: There is not enough space available for LV shrinking.
+
+  rescue:
+    - name: Decrement size target by .25G
+      ansible.builtin.set_fact:
+        bigboot_size_target: "{{ bigboot_size_target | human_to_bytes - 262144000 }}"
+
+    - name: Update required expansion space
+      ansible.builtin.set_fact:
+        bigboot_expansion_diff:
+          "{{ bigboot_size_target | human_to_bytes - bigboot_boot_partsize | human_to_bytes }}"
+
+    - name: Re-check disk space - RESCUE
+      ansible.builtin.include_tasks: check_space_fallback.yml
+