I have a provider for Vagrant that works fine, but following our previous discussion on VirtualBox and many tests, it appears that VirtualBox does not accept qemu-img converted vmdk files (vmdk headers issues).
Vagrant needs a vmdk disk to work.
To get a vmdk file accepted by virtualbox, we need to convert the raw image to vmdk with VBoxManager commands from VirtualBox. This means we need VirtualBox as dependency on Host (not image).
I could not find any converter doing correctly the job for virtualBox.
As I said, it is in contrib. However, when generating Vagrant images, it would make sense that user will have VirtualBox to test the image etc...
Regarding packaging of the build-debian-cloud, we could put vagrant provider as a separate package in contrib itself.
PS: vagrant provider does not install Guest Additions (as in contrib), so vagrant image has a few restrictions (shared folders...)
gpg key id: 4096R/326D8438 (keyring.debian.org)
Key fingerprint = 5FB4 6F83 D3B9 5204 6335 D26D 78DC 68DB 326D 8438