arch installation mostly works with zfsbootmgr

roles/base/tasks/archinstall/initialize_efi.yaml

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+---
+- name: Inspect EFI boot partitions
+  become: true
+  command: "blkid {{ item }}"
+  loop: "{{ base_efi_partitions | default([]) }}"
+  register: blkid
+
+- name: Format EFI partitions fat32
+  command: "mkfs.vfat -v -F 32 -n EFI {{ item.item }}"
+  loop: "{{ blkid.results | rejectattr('stdout', 'contains', 'TYPE=\"vfat\"') }}"
+  register: mkfs_vfat_efi

roles/base/tasks/archinstall/initialize_root_zvol.yaml

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+---
+- name: Check for existing zroot zfs volume
+  command: zpool list -Ho name zroot
+  register: zroot_check
+  ignore_errors: true
+
+- block:
+  - name: Initialize disk device to id table
+    set_fact:
+      partition_device_to_ids: {}
+
+  - name: Create disk device to id table
+    set_fact:
+      partition_device_to_ids: >-
+        {{
+          partition_device_to_ids
+          | combine({ item.value: (partition_device_to_ids[item.value] | default([])) + [item.key] })
+        }}
+    with_items: "{{ base_partitions_by_id | dict2items }}"
+
+  - name: Create zroot volume
+    become: true
+    command: >-
+      zpool create -f -o ashift=12
+        -o autotrim=on
+        -O devices=off
+        -O relatime=on
+        -O xattr=sa
+        -O acltype=posixacl
+        -O normalization=formD
+        -O compression=lz4
+        -O canmount=off
+        -O mountpoint=none
+        -R /mnt
+        zroot {{ mirror }} {{ base_root_partitions | map('extract', partition_device_to_ids) | flatten | list | join(' ') }}
+    vars:
+      mirror: "{{ 'mirror' if base_root_partitions | length > 1 else '' }}"
+  when: zroot_check.rc != 0
+
+- name: Create zroot/ROOT and zroot/DATA volumes
+  community.general.zfs:
+    name: "zroot/{{ item }}"
+    state: present
+  register: zfs_zroot_root_volume
+  with_items: [ROOT, DATA]
+
+- name: Create zroot/ROOT/arch
+  community.general.zfs:
+    name: zroot/ROOT/arch
+    state: present
+    extra_zfs_properties:
+      canmount: noauto
+      mountpoint: /
+  when: zfs_zroot_root_volume.changed
+
+- name: Create zroot/home
+  community.general.zfs:
+    name: zroot/DATA/home
+    state: present
+    extra_zfs_properties:
+      mountpoint: /home
+
+- name: Export zroot pool
+  command: zpool export zroot
+
+- name: Import zroot pool (-R /mnt)
+  command: zpool import -R /mnt zroot -N

roles/base/tasks/archinstall/initialize_swap.yaml

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+---
+- name: Initialize swap space
+  become: true
+  command: "blkid {{item}}"
+  loop: "{{ base_swap_partitions | default([]) }}"
+  register: blkid
+
+- name: Swap devices without swap filesystems present
+  become: true
+  command: "mkswap --verbose {{item.item}}"
+  loop: "{{ blkid.results | rejectattr('stdout', 'contains', 'TYPE=\"swap\"') }}"
+  register: mkswap

roles/base/tasks/archinstall/install_os.yaml

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+---
+- name: archinstall | install os | check for presence of previously pacstrapped /mnt
+  stat:
+    path: /mnt/usr/lib
+  register: existing_pacstrap
+
+- debug:
+    var: existing_pacstrap
+
+- name: archinstall | install os | pacstrap
+  shell: "pacstrap /mnt {{ packages | join(' ') }}"
+  vars:
+    packages:
+      - base
+      - base-devel
+      - efibootmgr
+      - git
+      - iwd
+      - linux-firmware
+      - linux-lts
+      - linux-lts-headers
+      - openssh
+  when: not existing_pacstrap.stat.exists
+
+- name: archinstall | install os | copy pacman mirrorlist
+  copy:
+    remote_src: true
+    src: /etc/pacman.d/mirrorlist
+    dest: /mnt/etc/pacman.d/mirrorlist
+
+- name: archinstall | install os | propagate root authorized keys
+  copy:
+    remote_src: true
+    src: /root/.ssh/authorized_keys
+    dest: /mnt/root/.ssh/authorized_keys
+
+- name: archinstall | install os | passwordless sudo for group wheel
+  copy:
+    content: "%wheel ALL=(ALL) NOPASSWD: ALL"
+    dest: /mnt/etc/sudoers.d/wheel-group-nopasswd
+
+- name: archinstall | install os | set timezone
+  file:
+    src: /usr/share/zoneinfo/US/Central
+    dest: /mnt/etc/localtime
+    state: link
+
+- name: archinstall | install os | enable en_US locales
+  command: sed -i 's/^#en_US/en_US/' /mnt/etc/locale.gen
+
+- name: archinstall | install os | generate locales
+  command: arch-chroot /mnt locale-gen
+
+- name: archinstall | install os | generate template for arch-chroot installation
+  template:
+    src: arch_chroot_install.sh
+    dest: /mnt/arch_chroot_install.sh
+    mode: "0755"
+
+- name: archinstall | install os | set hostname
+  copy:
+    dest: /mnt/etc/hostname
+    content: |
+      {{ inventory_hostname }}
+
+- name: archinstall | install os | run installation script in arch-chroot
+  command: arch-chroot /mnt /arch_chroot_install.sh
+  register: chroot
+
+- name: archinstall | install os | arch-chroot install output
+  debug:
+    msg: "{{ chroot.stdout_lines }}"
+
+- name: archinstall | install os | remove arch-chroot installation script
+  file:
+    path: /mnt/arch_chroot_install.sh
+    state: absent
+
+# TODO
+# - name: archinstall | install os | create fstab

roles/base/tasks/archinstall/mirrorlist.yaml

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+---
+- name: Select fastest Arch repository mirrors
+  command:
+    cmd: reflector --country US --latest 5 --sort rate --save /etc/pacman.d/mirrorlist

roles/base/tasks/archinstall/partition.yaml

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+---
+- name: Get details about rootfs disks
+  community.general.parted:
+    device: "{{ item }}"
+    unit: MiB
+  register: base_root_disks_info
+  loop: "{{ base_root_disks | list }}"
+
+- name: Calculate maximum usable disk space
+  ansible.builtin.set_fact:
+    base_root_usable_mib: "{{ (base_root_disks_info.results | map(attribute='disk.size') | min | int) - 1 }}"
+
+- debug: var=base_root_usable_mib
+
+- name: Calculate disk utilization percentage
+  ansible.builtin.set_fact:
+    base_root_usable_mib: "{{ base_root_usable_mib|int -  ((base_root_usable_mib|float) * (0.01 * (base_root_free_percent|float))) | round(method='floor') | int }}"
+
+- name: Calculate zfs volume size
+  set_fact:
+    base_root_zpool_mib: "{{ base_root_usable_mib|int - fixed_size_partitions|int }}"
+  vars:
+    fixed_size_partitions: "{{ base_root_swap_mib|int + base_root_efi_mib|int }}"
+#
+- name: Calculate partition layouts
+  set_fact:
+    partition_ranges: >-
+      {{
+      (partition_ranges|d([])) + [{
+        'begin': base_root_partitions[:(loop_index|int)] | map(attribute='size_mib') | map('int') | sum(),
+        'end': base_root_partitions[:(loop_index|int+1)] | map(attribute='size_mib') | map('int') | sum(),
+        }]
+      }}
+  vars:
+    loop_index: "{{ item }}"
+    base_root_partitions:
+      - name: efi
+        size_mib: "{{ base_root_efi_mib }}"
+      - name: root
+        size_mib: "{{ base_root_zpool_mib }}"
+      - name: swap
+        size_mib: "{{ base_root_swap_mib }}"
+  with_sequence: start=0 end="{{ base_root_partitions | length - 1}}"
+
+- debug:
+    var: partition_ranges
+
+- name: Initialize partition facts
+  set_fact:
+    base_efi_partitions: []
+    base_root_partitions: []
+    base_swap_partitions: []
+
+- name: Create EFI partition
+  become: true
+  vars:
+    part_index: 0
+  parted:
+    label: gpt
+    unit: MiB
+    name: EFI Boot
+    device: "{{ item.disk.dev }}"
+    number: "{{ part_index + 1 }}"
+    flags: [ boot, esp ]
+    part_start: "{{ [partition_ranges[part_index].begin, 1]|max }}MiB"
+    part_end: "{{ partition_ranges[part_index].end }}MiB"
+    state: present
+    fs_type: fat32
+  loop: "{{ base_root_disks_info.results }}"
+  register: parted_create
+
+- name: Store EFI partition details
+  set_fact:
+    base_efi_partitions: "{{ parted_create.results | map(attribute='disk.dev') | product([1]) | map('join') | list }}"
+
+- name: Create root zvol partition
+  become: true
+  vars:
+    part_index: 1
+  parted:
+    label: gpt
+    unit: MiB
+    name: ArchLinux ZFS Root
+    device: "{{ item.disk.dev }}"
+    number: "{{ part_index + 1 }}"
+    part_start: "{{ partition_ranges[part_index].begin }}MiB"
+    part_end: "{{ partition_ranges[part_index].end }}MiB"
+    state: present
+  loop: "{{ parted_create.results }}"
+  register: parted_create
+
+- name: Store root zvol partition details
+  set_fact:
+    base_root_partitions: "{{ parted_create.results | map(attribute='disk.dev') | product([2]) | map('join') | list }}"
+
+- name: Create swap partition
+  become: true
+  vars:
+    part_index: 2
+  parted:
+    label: gpt
+    unit: MiB
+    device: "{{ item.disk.dev }}"
+    number: "{{ part_index + 1 }}"
+    part_start: "{{ partition_ranges[part_index].begin }}MiB"
+    part_end: "{{ partition_ranges[part_index].end }}MiB"
+    state: present
+    fs_type: linux-swap
+  loop: "{{ parted_create.results }}"
+  register: parted_create
+  when: base_root_swap_mib is defined and base_root_swap_mib > 0
+
+- name: Store swap partition details
+  set_fact:
+    base_swap_partitions: "{{ parted_create.results | map(attribute='disk.dev') | product([3]) | map('join') | list }}"
+  when: base_root_swap_mib is defined and base_root_swap_mib > 0
+
+- name: Analyze resulting partition layouts
+  parted:
+    unit: MiB
+    device: "{{ item }}"
+  register: base_root_disks_info
+  loop: "{{ base_root_disks | list }}"
+
+- name: Collect disk device identifiers
+  shell: "for x in /dev/disk/by-id/*; do echo $x $(realpath $x); done"
+  register: disk_realpaths
+
+- name: Collect disk device identifiers into a base_partitions_by_id dictionary
+  set_fact:
+    base_partitions_by_id: >-
+      {{
+        dict(
+          disk_realpaths.stdout_lines
+          | map('split', ' ')
+          | map('list')
+        )
+      }}

roles/base/tasks/archinstall/postinstall_snapshot.yaml

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+- name: archinstall | re-create post-installation snapshot of zroot/ROOT/arch
+  community.general.zfs:
+    name: zroot/ROOT/arch@post-installation
+    state: "{{ item }}"
+  with_items: [absent, present]
+
+- name: archinstall | re-create post-installation snapshot of zroot/DATA/home
+  community.general.zfs:
+    name: zroot/DATA/home@post-installation
+    state: "{{ item }}"
+  with_items: [absent, present]

roles/base/tasks/archinstall/prepare_chroot.yaml

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+---
+- name: Mount arch zroot
+  command: zfs mount zroot/ROOT/arch
+
+- name: Mount all other zroot mountpoints
+  command: zfs mount -a
+
+- name: Create zroot destination directories
+  ansible.builtin.file:
+    path: "/mnt{{ item }}"
+    state: directory
+  loop:
+    - /etc/zfs
+    - /boot/efi
+
+- name: Mount EFI
+  ansible.posix.mount:
+    path: /mnt/boot/efi
+    src: "{{ base_efi_partitions | first }}"
+    fstype: vfat
+    state: mounted
+
+- name: zfs | set zroot bootfs to arch
+  command: zpool set bootfs=zroot/ROOT/arch zroot
+
+- name: zfs | set cachefile
+  command: zpool set cachefile=/etc/zfs/zpool.cache zroot
+
+- name: zfs | copy cache file to chroot
+  command: cp /etc/zfs/zpool.cache /mnt/etc/zfs

roles/base/tasks/main.yaml

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+---
+- block:
+  # - import_tasks: archinstall/mirrorlist.yaml
+  - import_tasks: archinstall/partition.yaml
+  - import_tasks: archinstall/initialize_root_zvol.yaml
+  - import_tasks: archinstall/initialize_swap.yaml
+  - import_tasks: archinstall/initialize_efi.yaml
+  - import_tasks: archinstall/prepare_chroot.yaml
+  - import_tasks: archinstall/install_os.yaml
+  - import_tasks: archinstall/postinstall_snapshot.yaml
+  when: base_root_disks is defined and ansible_hostname == 'archiso'
+