Debug mode to not destroy VM on error

[staticfloat]

It would be really useful when trying to get my packer buildscripts running properly if there were an option I could set to stop packer from destroying the VM on error. I often need to inspect the current state of the VM when something goes wrong, and this is impossible when packer cleans everything up immediately.

[petehayes]

+1

[Sheshagiri]

I think this is a good option to have. But you can still use boot_wait and ssh_wait_timeout to try and debug while your build is still going on. Set these flags to higher values so that you can check for any possible errors during the build.

[mitchellh]

There is another issue tracking this actually, from a ways back. Sorry to do this but going to close this for that issue. It is an enhancement we plan on adding!

[pangratz]

For reference: #409.