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[libvirt] RFC: Enable Libvirt to handle OVA installation

This is a proposal to enhance Libvirt library to handle OVA package installation.
OVA is one of the widely accepted and consortium defined/maintained format for
Virtual Machine distros. Technically it is a tar file with three main components:
1. VMX descriptor (XML file defining virtual machine specifics such as: virtual hardware etc.
2. VMDKs in a compressed format.
3. Manifest file.

1. Expose a public API method to allow an application to invoke OVA installation with
   a file pointer to OVA file. 
2. OVA util file:
   This file understands the OVA formats and rips out the given package to extract specific information:
   2.1. int get_vmx(char *vmx):
        method can return VMX descriptor associated with a given OVA file.
   2.2. int get_vmdks(struct ova_type *ova):
        method that seek the OVA file and populate ova_type struct which may look like;
  typedef struct disk_list_tag {
   char *file_name;
   off_t file_size;
   off_t file_offset;
   struct disk_list_tag *next;
        typedef struct ova_type {
   int num_vmdks;
   ova_list *head;
2. Hypervisor specific changes:
   It can be done in more than one way:
   2.1: Enhance hypervisor driver function to implement hypervisor specific routines to
        perform OVA installations.
   2.2.: Append a new driver to handle OVA installation such as virOvaDriver, main routines can be:
         open() : parse OVA using util functions.
   list_disk(): may display disk names

   (Please suggest if there can be more routines to this driver, it can be enhanced later as well).
  It is possible to design this driver to handle OVA parsing as well, but I think keeping it in
  'util' may make that code available for all hypervisors given OVA format does not change per

  I'm inclined more towards 2.2 design as it is more generic and provides room for furture extensions.
Looking forward for comments/suggestions.

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