Package downloads consistently failing on El Capitan

[rypit]

After taking a look at boxen/puppet-virtualbox#35, it seems like people are starting to lean on puppet-brewcask since cask has a large community and generally keeps things up to date.

However, after adding the project to our "our-boxen", I get the following errors every time I try to include a package with brewcask as the provider:

my_project.pp

# ...
package {"vagrant": provider => "brew cask"}

$ boxen my_project

# ...
Debug: Prefetching brewcask resources for package
Debug: Executing 'brew cask install vagrant'
Error: Execution of 'brew cask install vagrant' returned 1: ==> Downloading https://releases.hashicorp.com/vagrant/1.7.4/vagrant_1.7.4.dmg
Error: Download failed on Cask 'vagrant' with message: Download failed: https://releases.hashicorp.com/vagrant/1.7.4/vagrant_1.7.4.dmg
Error: /Stage[main]/Projects::My_project/Package[vagrant]/ensure: change from absent to present failed: Execution of 'brew cask install vagrant' returned 1: ==> Downloading https://releases.hashicorp.com/vagrant/1.7.4/vagrant_1.7.4.dmg
Error: Download failed on Cask 'vagrant' with message: Download failed: https://releases.hashicorp.com/vagrant/1.7.4/vagrant_1.7.4.dmg

This is on OS X 10.11 (15A284), with Xcode 7.1 Version 7.1.1 (7B1005).

The same command when run from the terminal executes successfully.

Any help is much appreciated.

[rypit]

Solved via @n0ts's suggestion here: #22 (comment)

  sudoers { 'installer':
    users    => $::boxen_user,
    hosts    => 'ALL',
    commands => [
      '(ALL) SETENV:NOPASSWD: /usr/sbin/installer',
    ],
    type     => 'user_spec',
  }

  package { 'virtualbox':
    provider => 'brewcask',
    require  => Sudoers['installer'],
  }

  package { "vagrant":
    provider => "brewcask",
  }

Note: I also am now running the following boxen module versions:

github "brewcask",    "0.0.6"
github "homebrew",    "2.0.0"