---
- name: prepare environment
  hosts: localhost
  tasks:
  - name: cache apk tools
    get_url:
      url: "{{ apk_tools_url }}"
      dest: /cache/apk.static
      checksum: "{{ apk_tools_checksum }}"

- name: configure alpine
  hosts: all
  gather_facts: false
  vars:
    chroot_directory: /mnt
    root_device_path: "/dev/sda"
  tasks:
  - name: deploy apk-tools to rescue system
    copy:
      src: /cache/apk.static
      dest: apk
      mode: ug=rwx,o=r

  - name: "zap all partitions on {{ root_device_path }} and create GPT table"
    shell: "sgdisk --zap-all {{ root_device_path }}"

  - name: "create boot partition {{ root_device_path }}-boot"
    shell: "sgdisk -g -n1:0:{{ boot_size }} -t1:8300 -c1:boot -A1:set:2 {{ root_device_path }}"

  - name: "create root partition {{ root_device_path }}-root"
    shell: "sgdisk -g -n2:0:{{ root_size }} -t2:8300 -c2:root {{ root_device_path }}"

  - name: mount-drives
    shell: |
      umount -R /mnt

      mkfs.ext4      -q -L root /dev/disk/by-partlabel/root
      mkfs.ext4 -m 0 -q -L boot /dev/disk/by-partlabel/boot
      mount /dev/disk/by-partlabel/root {{ chroot_directory }}
      mkdir -p {{ chroot_directory }}/boot
      mount /dev/disk/by-partlabel/boot {{ chroot_directory }}/boot

  - name: register uuid of boot disk
    shell: |
      blkid /dev/disk/by-partlabel/boot | grep -o '\bUUID="[^"]*"' | sed 's/"//g'
    register: boot_uuid

  - name: register uuid of root disk
    shell: |
      blkid /dev/disk/by-partlabel/root | grep -o '\bUUID="[^"]*"' | sed 's/"//g'
    register: root_uuid

  - name: initialize alpine-base in directory
    shell: >-
      ./apk -X {{ alpine_repositories[0].url }}
      -u
      --allow-untrusted
      --root /{{ chroot_directory }}
      --initdb
      add alpine-base

  - name: prepare chroot
    shell: |
      mount --bind /dev  {{ chroot_directory }}/dev
      mount --bind /proc {{ chroot_directory }}/proc
      mount --bind /sys  {{ chroot_directory }}/sys

  - name: copy resolv conf from the rescue system to the server
    copy:
      content: |
        {% for nameserver in nameservers %}
        nameserver {{ nameserver }}
        {% endfor %}
      dest: "{{ chroot_directory }}/etc/resolv.conf"

  - name: setup networking
    copy:
      content: |
        auto lo
        iface lo inet loopback
        {% for dif in dhcp_interfaces %}
        auto {{ dif }}
        iface {{ dif }} inet dhcp
        iface {{ dif }} inet6 auto
        {% endfor %}
      dest: "{{ chroot_directory }}/etc/network/interfaces"

  - name: write out hostname file
    copy:
      dest: "{{ chroot_directory }}/etc/hostname"
      content: "{{ hostname }}"

  - name: overwrite hosts file
    copy:
      dest: "{{ chroot_directory }}/etc/hosts"
      content: |
        127.0.0.1 {{ hostname }} localhost localhost.localdomain
        ::1       {{ hostname }} localhost localhost.localdomain
        ::1       {{ hostname }} localhost ipv6-localhost ipv6-loopback
        fe00::0   ipv6-localnet
        ff00::0   ipv6-mcastprefix
        ff02::1   ipv6-allnodes
        ff02::2   ipv6-allrouters
        ff02::3   ipv6-allhosts

  - name: install custom repository keys
    copy:
      dest: "{{ chroot_directory }}/etc/apk/keys/{{ item.name }}"
      content: "{{ item.public_key }}"
    loop: "{{ alpine_repository_keys }}"

  - name: define alpine repositories
    copy:
      dest: "{{ chroot_directory }}/etc/apk/repositories"
      content: |
        {% for repository in alpine_repositories %}
        {% if repository.tag | d(false) %}@{{ repository.tag }} {% endif %}{{ repository.url }}
        {% endfor %}

  - name: install requisite packages
    shell: |
      chroot {{ chroot_directory }} apk add --no-cache {{ item.key }}{{ item.value }}
    loop: "{{ packages | dict2items }}"

  - name: configure services
    shell: |
      chroot {{ chroot_directory }} rc-update add {{ item.key }} {{ item.value }}
    loop: "{{ services | dict2items }}"

  - name: enable cloud-init
    shell: |
      chroot {{ chroot_directory }} setup-cloud-init
    when: packages["cloud-init"] is defined

  - name: configure fstab
    copy:
      dest: "{{ chroot_directory }}/etc/fstab"
      content: |
        {{ root_uuid.stdout | trim }}  /      ext4  defaults,noatime   0 0
        {{ boot_uuid.stdout | trim }}  /boot  ext4  defaults           0 2

  - name: configure sysctl
    copy:
      dest: "{{ chroot_directory }}/etc/sysctl.conf"
      content: |
        {% for setting in sysctl | dict2items %}
        {{ setting.key }} = {{ setting.value }}
        {% endfor %}

  - name: configure kernel modules
    copy:
      dest: "{{ chroot_directory }}/etc/modules"
      content: |
        {% for module in kernel_modules %}
        {{ module }}
        {% endfor %}

  - name: configure extlinux
    copy:
      dest: "{{ chroot_directory }}/etc/update-extlinux.conf"
      content: |
        overwrite=1
        vesa_menu=0
        default_kernel_opts="{{ default_kernel_opts | join(" ") }}"
        modules={{ extlinux_modules | join(",") }}
        root={{ root_uuid.stdout | trim }}
        verbose=0
        hidden=1
        timeout=1
        default=lts
        serial_port=
        serial_baud=115200
        xen_opts=dom0_mem=384M
        password=''

  - name: configure mkinitfs
    copy:
      dest: "{{ chroot_directory }}/etc/mkinitfs/mkinitfs.conf"
      content: |
        features="{{ kernel_features | join(" ") }}"

  - name: install boot
    shell: |
      chroot {{ chroot_directory }} update-extlinux
      chroot {{ chroot_directory }} extlinux -i /boot
      chroot {{ chroot_directory }} dd bs=440 conv=notrunc count=1 if=/usr/share/syslinux/gptmbr.bin of={{ root_device_path }}

  - name: execute arbitrary commands
    shell: |
      chroot {{ chroot_directory }} sh <<CHROOT_COMMAND_HD
      {{ item }}
      CHROOT_COMMAND_HD
    loop: "{{ chroot_commands }}"