Cannot change permissions of folders within vagrant home folder

The format for shared folders changes across different versions of Vagrant. See Fabio’s answer https://serverfault.com/questions/398414/vagrant-set-default-share-permissions

Vagrant version 1.3.1 and earlier

config.vm.share_folder "v-data", "/export", "/export",
:owner => 'vagrant',
:group => 'httpd',
:extra => 'dmode=775,fmode=775'

Vagrant version 1.3.1, 1.3.2

In Vagrant 1.3.1 and later, the extra option has been replaced with mount_options that expects an array.

config.vm.share_folder "v-data", "/export", "/export",
:owner => 'vagrant',
:group => 'httpd',
:mount_options => ['dmode=775', 'fmode=775']

Vagrant version >=1.3.3

In vagrant 1.3.3 it appears config.vm.share_folder has been replaced with config.vm.synced_folder.

config.vm.synced_folder "v-data", "/export", "/export",
:owner => 'vagrant',
:group => 'httpd',
:mount_options => ['dmode=775', 'fmode=775']