boot.yaml

variant: fcos
version: 1.4.0
storage:
  files:
    - path: /etc/coreos/installer.d/custom.yaml
      contents:
        inline: |
          dest-device: {{ install_drive }}
          ignition-file: /etc/install.ign
      mode: 0644
    - path: /etc/install.ign
      contents:
        inline: |
          {{ install_ignition }}
      mode: 0644
systemd:
  units:
    - name: coreos-installer.service
      enabled: true
      contents: |
        [Unit]
        Description=Run CoreOS Installer
        Requires=coreos-installer-pre.target
        After=coreos-installer-pre.target
        OnFailure=emergency.target
        OnFailureJobMode=replace-irreversibly

        [Service]
        Type=oneshot
        ExecStart=/usr/bin/coreos-installer install --offline -i /etc/install.ign {{ install_drive }}
        ExecStart=/usr/bin/systemctl --no-block reboot
        StandardOutput=kmsg+console
        StandardError=kmsg+console

        [Install]
        RequiredBy=default.target