From 396d802dc3f7e5234164671e9b0ba8ea33aaa07e Mon Sep 17 00:00:00 2001
From: Sandwich <sandwich@archworks.co>
Date: Fri, 2 Jan 2026 16:08:36 +0100
Subject: [PATCH] Enable full-disk LVM root sizing

---
 README.md                            |  1 +
 roles/partitioning/defaults/main.yml |  1 +
 roles/partitioning/tasks/main.yml    | 30 ++++++++++++++++++++++++++--
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index a4fe276..10267e8 100644
--- a/README.md
+++ b/README.md
@@ -129,6 +129,7 @@ Use these only when you need to override the default layout logic.
 | `partitioning_boot_size_mib` | `/boot` size in MiB when a separate boot is used.        | `1024`        |
 | `partitioning_separate_boot` | Force a separate `/boot` partition.                      | `true`        |
 | `partitioning_boot_fs_fstype` | Filesystem for `/boot` when separate.                   | `ext4`        |
+| `partitioning_use_full_disk` | Use remaining LVM space for the root volume.             | `true`        |
 
 To protect sensitive information, such as passwords, API keys, and other confidential variables (e.g., `hypervisor_password`), **it is recommended to use Ansible Vault**.
 
diff --git a/roles/partitioning/defaults/main.yml b/roles/partitioning/defaults/main.yml
index 6d972c3..4a313f9 100644
--- a/roles/partitioning/defaults/main.yml
+++ b/roles/partitioning/defaults/main.yml
@@ -22,6 +22,7 @@ partitioning_efi_size_mib: 512
 partitioning_efi_start_mib: 1
 partitioning_efi_end_mib: "{{ (partitioning_efi_start_mib | int) + (partitioning_efi_size_mib | int) }}"
 partitioning_boot_size_mib: 1024
+partitioning_use_full_disk: true
 partitioning_separate_boot: >-
   {{
     (partitioning_luks_enabled | bool)
diff --git a/roles/partitioning/tasks/main.yml b/roles/partitioning/tasks/main.yml
index 5609f6a..420cd38 100644
--- a/roles/partitioning/tasks/main.yml
+++ b/roles/partitioning/tasks/main.yml
@@ -278,7 +278,11 @@
               - partitioning_lvm_swap_target_gb
             ) | float
           }}
-        partitioning_lvm_root_gb: >-
+        partitioning_lvm_home_gb: >-
+          {{
+            ([([(((partitioning_vm_size_effective | float) - 20) * 0.1), 2] | max), 20] | min)
+          }}
+        partitioning_lvm_root_default_gb: >-
           {{
             [
               (
@@ -310,6 +314,28 @@
                 partitioning_lvm_swap_target_gb
               )
           }}
+        partitioning_lvm_root_full_gb: >-
+          {{
+            [
+              (
+                (partitioning_vm_size_effective | float)
+                - (partitioning_reserved_gb | float)
+                - (partitioning_lvm_swap_gb | float)
+                - (
+                    (partitioning_lvm_home_gb | float) + 5.5
+                    if cis_enabled
+                    else 0
+                  )
+              ),
+              4
+            ] | max | round(2, 'floor')
+          }}
+        partitioning_lvm_root_gb: >-
+          {{
+            partitioning_lvm_root_full_gb
+            if partitioning_use_full_disk | bool
+            else partitioning_lvm_root_default_gb
+          }}
       community.general.lvol:
         vg: sys
         lv: "{{ item.lv }}"
@@ -321,7 +347,7 @@
         - lv: swap
           size: "{{ partitioning_lvm_swap_gb | string + 'G' }}"
         - lv: home
-          size: "{{ ([([(((partitioning_vm_size_effective | float) - 20) * 0.1), 2] | max), 20] | min) | string + 'G' }}"
+          size: "{{ partitioning_lvm_home_gb | string + 'G' }}"
         - {lv: var, size: "2G"}
         - {lv: var_log, size: "2G"}
         - {lv: var_log_audit, size: "1.5G"}