command for debugging and log packer build in windows

Question

I want to log in a file my verbose debugging packer build ubuntu-14.04-amd64.json which don't want to install few tool in my script.

What is the exact command for run a build with debugging and logging in a file the build packer ?

I also run PACKER_LOG=1 packer build -debug ubuntu-14.04-amd64.json or try to export variable shell but not run

Answer 1

(UNIX)

$ export PACKER_LOG_PATH="/var/log/packer.log"
$ export PACKER_LOG=10
$ packer build -debug ubuntu_64.json

(WINDOWS)

$ set PACKER_LOG=10
$ set PACKER_LOG_PATH=c:\temp\packer log
$ packer build -debug ubuntu_64.json

Now You have a file which contain all messages appear in console during the process of building.