Quick and dirty OpenStack image creation

images-hack.yml

---
# Images are defined in group_vars/all/glance-images.yml.
# imagespec is used for individual images, e.g. "-e imagespec=centos-6,centos-7".
- name: Add images to OpenStack
  hosts: localhost
  # This environment block shouldn't be needed, but it doesn't work otherwise!
  environment:
    LIBGUESTFS_BACKEND: direct
  vars:
    workdir: /mnt/scratch # Directory where the images are temporarily stored
    is_public: true # If you want to upload a private image, add "-e is_public=false"
    image_owner: cloudy-admins
    image_name_postfix: ""
    hyper: "{{ kvm_server }}" # Infranode where images are customized.
  tasks:
    - name: Download new images
      get_url:
        url: "{{ item.value.url_prefix }}{{ item.value.filename }}"
        dest: "{{ workdir }}/{{ item.value.filename }}"
        mode: 0660
      with_dict: "{{glance_images}}"
      when: imagespec is undefined or "{{item.key}}" in imagespec

    - name: Customize images if needed
      include: hooks/glance-image-customize.yml
      with_dict: "{{ glance_images }}"
      when:
        - item.value.modify_hook is defined
        - imagespec is undefined or "{{item.key}}" in imagespec

    - name: Convert qcow2 images to raw format
      command: "qemu-img convert -f qcow2 -O raw {{ workdir }}/{{ item.value.filename }} {{ workdir }}/{{ item.value.filename }}.raw"
      with_dict: "{{ glance_images }}"
      when: imagespec is undefined or "{{ item.key }}" in imagespec

    - name: Upload images to Glance
      os_image:
        name: "{{ item.key }}{{ image_name_postfix }}"
        filename: "{{ workdir }}/{{ item.value.filename }}.raw"
        is_public: "{{ is_public }}"
        disk_format: raw
        owner: "{{ image_owner }}"
        properties:
          hw_scsi_model: virtio-scsi
          hw_disk_bus: scsi
      with_dict: "{{ glance_images }}"
      when: imagespec is undefined or "{{ item.key }}" in imagespec

    - name: Delete local qcow2 images
      file:
        path: "{{ workdir }}/{{ item.value.filename }}"
        state: absent
      with_dict: "{{ glance_images }}"
      when: imagespec is undefined or "{{ item.key }}" in imagespec

    - name: Delete local raw images
      file:
        path: "{{ workdir }}/{{ item.value.filename }}.raw"
        state: absent
      with_dict: "{{ glance_images }}"
      when: imagespec is undefined or "{{ item.key }}" in imagespec

Obviously you guys need to build images in some cases, and our approach is totally dependant on the upstream images (and they are far from perfect), but never the less it's turned out to be a pretty good solution and saved me a lot of time!
I take the philosophy that we can fix bad/broken images as needed with ansible, virt-customize or guestfish. See the related hacks in a-r-provision-vm (our fork) https://github.com/SoneraCloud/ansible-role-provision-vm/blob/master/tasks/image-guest.yml#L66-L87