[viraptor]

The idea of the base boxes is there, sure. But the ability to configure repositories, make base box of that, install keys, make base box of that, install required told, make base box of that, ... etc. with the mechanism for transparent reuse of the latest cached box you care about is not available on vagrant. And when you're making changes and debugging, it makes all the difference. If vagrant integrated a nice way to do that, the time saving would be amazing.

[stephenr]

You kind of can do that, but it's not a Vagrant feature, so much as a Packer feature.

Most of the Packer builders (e.g. virtualbox, parallels, VMware) support building from scratch (i.e. start with ISO install media and a blank VM disk) OR building from an existing VM.

So you could have a multi-stage Packer build pipeline that iterates step by step.

But I'm still not really sure what your workflow is. My company builds a series of Debian (and for a client, Ubuntu) base boxes. When debugging issues, 99% of time required is checking/fixing inside a running box. Once a solution is found, applying that back to the base box provisioning scripts (or preseed or even the packer config) and testing a build doesn't take that long.