feat(configuration): generic FDE with systemd-cryptenroll, clevis fallback, and configurable initramfs

roles/configuration/tasks/encryption/initramfs_detect.yml

@@ -0,0 +1,98 @@
+---
+# Resolve initramfs generator and TPM2 unlock method.
+# Sets _initramfs_generator and _tpm2_method facts.
+#
+# Generator detection: derived from the platform's initramfs_cmd
+#   (dracut → dracut, mkinitcpio → mkinitcpio, else → initramfs-tools)
+# TPM2 method: systemd-cryptenroll when generator supports tpm2-device,
+#   clevis fallback otherwise. Non-native dracut installed automatically.
+
+- name: Resolve initramfs generator
+  vars:
+    _user_generator: "{{ system_cfg.features.initramfs.generator | default('') }}"
+    _native_generator: >-
+      {{
+        'dracut' if _configuration_platform.initramfs_cmd is search('dracut')
+        else ('mkinitcpio' if _configuration_platform.initramfs_cmd is search('mkinitcpio')
+        else 'initramfs-tools')
+      }}
+  ansible.builtin.set_fact:
+    _initramfs_generator: >-
+      {{ _user_generator if _user_generator | length > 0 else _native_generator }}
+    _initramfs_native_generator: "{{ _native_generator }}"
+
+# --- Install non-native dracut if overridden or needed ---
+- name: Install dracut in chroot when not native
+  when:
+    - _initramfs_generator == 'dracut'
+    - _initramfs_native_generator != 'dracut'
+  ansible.builtin.shell: >-
+    {{ chroot_command }} sh -c '
+      command -v apt >/dev/null 2>&1 && apt install -y dracut ||
+      command -v pacman >/dev/null 2>&1 && pacman -S --noconfirm dracut ||
+      command -v dnf >/dev/null 2>&1 && dnf install -y dracut
+    '
+  register: _dracut_install_result
+  changed_when: _dracut_install_result.rc == 0
+  failed_when: false
+
+- name: Override initramfs command to dracut
+  when:
+    - _initramfs_generator == 'dracut'
+    - _initramfs_native_generator != 'dracut'
+  vars:
+    # Generate dracut initramfs with output name matching what GRUB expects:
+    #   mkinitcpio native: /boot/initramfs-linux.img (Arch convention)
+    #   initramfs-tools native: /boot/initrd.img-<kver> (Debian convention)
+    _dracut_cmd: >-
+      {{
+        'bash -c "for kver in /lib/modules/*/; do kver=$(basename $kver); dracut --force /boot/initramfs-linux.img $kver; done"'
+        if _initramfs_native_generator == 'mkinitcpio'
+        else 'bash -c "for kver in /lib/modules/*/; do kver=$(basename $kver); dracut --force /boot/initrd.img-$kver $kver; done"'
+      }}
+  ansible.builtin.set_fact:
+    _configuration_platform: >-
+      {{ _configuration_platform | combine({'initramfs_cmd': _dracut_cmd}) }}
+
+# --- TPM2 method detection ---
+- name: Probe dracut for TPM2 module support
+  when:
+    - configuration_luks_auto_method == 'tpm2'
+    - _initramfs_generator != 'mkinitcpio'
+  ansible.builtin.command: "{{ chroot_command }} dracut --list-modules"
+  register: _dracut_modules_check
+  changed_when: false
+  failed_when: false
+
+- name: Resolve TPM2 unlock method
+  when: configuration_luks_auto_method == 'tpm2'
+  vars:
+    # mkinitcpio sd-encrypt supports tpm2-device natively
+    # dracut with tpm2-tss module supports tpm2-device natively
+    # everything else needs clevis
+    _supports_tpm2_native: >-
+      {{
+        _initramfs_generator == 'mkinitcpio'
+        or ('tpm2-tss' in (_dracut_modules_check.stdout | default('')))
+      }}
+  ansible.builtin.set_fact:
+    _tpm2_method: "{{ 'systemd-cryptenroll' if _supports_tpm2_native | bool else 'clevis' }}"
+
+# --- Auto-upgrade to dracut when tpm2-tss available but generator isn't dracut ---
+- name: Switch to dracut for TPM2 support
+  when:
+    - configuration_luks_auto_method == 'tpm2'
+    - _tpm2_method == 'systemd-cryptenroll'
+    - _initramfs_generator not in ['dracut', 'mkinitcpio']
+  vars:
+    _dracut_cmd: >-
+      bash -c "for kver in /lib/modules/*/; do kver=$(basename $kver); dracut --force /boot/initrd.img-$kver $kver; done"
+  ansible.builtin.set_fact:
+    _initramfs_generator: dracut
+    _configuration_platform: >-
+      {{ _configuration_platform | combine({'initramfs_cmd': _dracut_cmd}) }}
+
+- name: Report TPM2 configuration
+  when: configuration_luks_auto_method == 'tpm2'
+  ansible.builtin.debug:
+    msg: "TPM2 unlock: {{ _tpm2_method | default('none') }} | initramfs: {{ _initramfs_generator }}"