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Step: ansible
-----------------------------------------------------------------------------

Run Ansible using a provided playbook, to configure the image. vmdb2
sets up Ansible so that it treats the image as the host being
configured (via the `chroot` connecion). The image MUST have Python
installed (version 2 or 3 depending on Ansible version).

Step keys:

* `ansible` — REQUIRED; value is the tag of the root filesystem.

* `playbook` — REQUIRED; value is the filename of the Ansible
  playbook, relative to the .vmdb file.

Example (in the .vmdb file):

    - apt: install
      tag: root
      packages: [python]

    - ansible: root
      playbook: foo.yml

Example (`foo.yml`):

    - hosts: image
      tasks:

        - name: "set /etc/hostname"
          shell: |
            echo "{{ hostname }}" > /etc/hostname

        - name: "unset root password"
          shell: |
            sed -i '/^root:[^:]*:/s//root::/' /etc/passwd

        - name: "configure networking"
          copy:
            content: |
              auto eth0
              iface eth0 inet dhcp
              iface eth0 inet6 auto
            dest: /etc/network/interfaces.d/wired

      vars:
        hostname: discworld