Add USB passthrough

conf/virtualbox_mapping.yml

 integer:
     memory: memory
     cpus: cpus
+other:
+    vb_customize: customize

modules/preprocessing.py

@@ -72,6 +72,14 @@ def _delete_dummy_router(definitions):
             return
 
 
+def _add_usb_passthrough(definitions):
+    """Add usb passthrough to devices"""
+    for host in definitions["hosts"]:
+        if "extra" in host and host["extra"]:
+            if "usb_passthrough" in host["extra"]:
+                host["vb_customize"] = '["modifyvm", :id, "--usb", "on"]'
+
+
 def _find_windows_boxes(definitions):
     """Find and return list of host names with windows boxes."""
     windows_hosts = []
@@ -147,3 +155,9 @@ def preprocess(definitions, flags):
     except Exception:
         cleanup_and_exit("Preprocessing not successful: "
                          "Could not add flavors.")
+
+    try:
+        _add_usb_passthrough(definitions)
+    except Exception:
+        cleanup_and_exit("Preprocessing not successful: "
+                         "Could not add USB passthrough.")

modules/vagrant_generator.py

@@ -24,7 +24,8 @@ def _create_simple_attribute(key, value, attribute_type):
 
 def _create_complex_attribute(key, value):
     """Create complex vagrant attributes that are not string, int or bool."""
-    separators = {VAGRANT_MAPPING["other"]["synced_folder"]: ""}
+    separators = {VAGRANT_MAPPING["other"]["synced_folder"]: "",
+                  VIRTUALBOX_MAPPING["other"]["vb_customize"]: ""}
 
     attribute = dict()
     attribute["type"] = "other"
@@ -85,6 +86,10 @@ def _create_commands(device_attributes):
             vagrant_attribute = VIRTUALBOX_MAPPING["integer"][attribute]
             vb_commands.append(_create_simple_attribute(vagrant_attribute,
                                                         value, "integer"))
+        elif attribute in VIRTUALBOX_MAPPING["other"]:
+            vagrant_attribute = VIRTUALBOX_MAPPING["other"][attribute]
+            vb_commands.append(_create_complex_attribute(vagrant_attribute,
+                                                         value))
 
     if vb_commands:
         virtual_box_command = dict()

templates/vagrantfile

@@ -162,6 +162,8 @@ end
     {{ dictionary(item, namespace) -}}
 {% elif item.type == "groups" %}
     {{ groups(item, namespace) -}}
+{% elif item.type == "other" %}
+    {{ other(item, namespace) -}}
 {% endif %}
 {% endfor %}
     end