temporary hack to address bug with vagrant-vbguest installation on vagrant 1.7.1

gistfile1.txt

    # temporary hack to address bug with vagrant-vbguest installation
    # https://github.com/mitchellh/vagrant/issues/4962
    if awk "BEGIN {exit `vagrant -v` == "1.7.1" ? 0 : 1 }"
    then
      sudo sed -i .original 's/\*\*opts/opts/g' /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/lib/vagrant/machine.rb
    fi

Confirmed 1.7.2 does indeed fix this problem. Prior to upgrading to 1.7.2 myself, I was getting this:

~/VAGRANT/BRONZE ᐅ vagrant package --output silver.box
/opt/vagrant/embedded/gems/gems/vagrant-1.7.1/lib/vagrant/machine.rb:153:in action': wrong number of arguments (2 for 1) (ArgumentError) from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/plugins/commands/package/command.rb:83:inpackage_vm'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/plugins/commands/package/command.rb:72:in block in package_target' from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/lib/vagrant/plugin/v2/command.rb:226:inblock in with_target_vms'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/lib/vagrant/plugin/v2/command.rb:220:in each' from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/lib/vagrant/plugin/v2/command.rb:220:inwith_target_vms'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/plugins/commands/package/command.rb:70:in package_target' from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/plugins/commands/package/command.rb:44:inexecute'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/lib/vagrant/cli.rb:42:in execute' from /opt/vagrant/embedded/gems/gems/vagrant-1.7.1/lib/vagrant/environment.rb:301:incli'
from /opt/vagrant/bin/../embedded/gems/gems/vagrant-1.7.1/bin/vagrant:174:in `

'

cool, this solved the packaging problem for me, btw, how do you find this bug?
find it using --debug message? but it seems the error message is not in the debug infomation, so how do you locate this bug?