refactor(global_defaults): split system.yml into composable normalization stages

roles/global_defaults/tasks/_normalize_disks.yml

@@ -0,0 +1,100 @@
+---
+- name: Normalize system disks input
+  vars:
+    system_disks: "{{ system_cfg.disks | default([]) }}"
+    system_disk_letter_map: "abcdefghijklmnopqrstuvwxyz"
+    system_disk_device_prefix: >-
+      {{
+        {'libvirt': '/dev/vd', 'xen': '/dev/xvd', 'proxmox': '/dev/sd', 'vmware': '/dev/sd'}.get(hypervisor_type, '')
+        if system_cfg.type == 'virtual'
+        else ''
+      }}
+  block:
+    - name: Validate system disks structure
+      ansible.builtin.assert:
+        that:
+          - system_disks is sequence
+          - (system_disks | length) <= 26
+        fail_msg: "system.disks must be a list with at most 26 entries."
+        quiet: true
+
+    - name: Validate system disk entries
+      ansible.builtin.assert:
+        that:
+          - item is mapping
+          - item.mount is not defined or item.mount is mapping
+        fail_msg: "Each disk entry must be a dictionary, and disk.mount (if set) must be a dictionary."
+        quiet: true
+      loop: "{{ system_disks }}"
+      loop_control:
+        label: "{{ item | to_json }}"
+
+    - name: Initialize normalized disk list
+      ansible.builtin.set_fact:
+        system_disks_cfg: []
+
+    - name: Build normalized system disk configuration
+      vars:
+        disk_idx: "{{ ansible_loop.index0 }}"
+        disk_letter: "{{ system_disk_letter_map[disk_idx] }}"
+        disk_cfg_base: "{{ system_disk_defaults | combine(item, recursive=True) }}"
+        disk_mount: "{{ system_disk_defaults.mount | combine((disk_cfg_base.mount | default({})), recursive=True) }}"
+        disk_mount_path: "{{ (disk_mount.path | default('') | string) | trim }}"
+        disk_mount_fstype: >-
+          {{
+            disk_mount.fstype
+            if (disk_mount.fstype | default('') | string | length) > 0
+            else ('ext4' if disk_mount_path | length > 0 else '')
+          }}
+        disk_device: >-
+          {{
+            disk_cfg_base.device
+            if (disk_cfg_base.device | string | length) > 0
+            else (
+              (system_disk_device_prefix ~ disk_letter)
+              if system_cfg.type == 'virtual'
+              else ''
+            )
+          }}
+        disk_partition: >-
+          {{
+            disk_device ~ ('p1' if (disk_device | regex_search('\\d$')) else '1')
+            if disk_device | length > 0
+            else ''
+          }}
+      ansible.builtin.set_fact:
+        system_disks_cfg: >-
+          {{
+            system_disks_cfg + [
+              disk_cfg_base
+              | combine(
+                  {
+                    'device': disk_device,
+                    'mount': {
+                      'path': disk_mount_path,
+                      'fstype': disk_mount_fstype,
+                      'label': disk_mount.label | default('') | string,
+                      'opts': disk_mount.opts | default('defaults') | string
+                    },
+                    'partition': disk_partition
+                  },
+                  recursive=True
+                )
+            ]
+          }}
+      loop: "{{ system_disks }}"
+      loop_control:
+        loop_var: item
+        extended: true
+        label: "{{ item | to_json }}"
+
+    - name: Update system configuration with normalized disks
+      ansible.builtin.set_fact:
+        system_cfg: "{{ system_cfg | combine({'disks': system_disks_cfg}, recursive=True) }}"
+
+    - name: Set install_drive from primary disk
+      when:
+        - system_disks_cfg | length > 0
+        - system_disks_cfg[0].device | string | length > 0
+      ansible.builtin.set_fact:
+        install_drive: "{{ system_disks_cfg[0].device }}"