virt-builder: Distro metadata

virt-install
↓
virt-sysprep
↓
virt-sparsify
↓
xz compress
↓
Online template repository
(http://libguestfs.org/download/builder)

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Hash: SHA1

[centos-6.6]
name=CentOS 6.6
arch=x86_64
file=CentOS-6.6-x86_64-Cloud.raw.xz
checksum[sha512]=fc403ea3555a560...
format=raw
size=6442450944
compressed_size=199265736
expand=/dev/sda3

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virt-builder can pull templates from multiple repositories.