Add ubuntu_drivers config module

The ubuntu_drivers config module enables usage of the 'ubuntu-drivers'
command. At this point it only serves as a way of installing NVIDIA
drivers for general purpose graphics processing unit (GPGPU)
functionality.

Also, a small usability improvement to get_cfg_by_path to allow it to
take a string for the key path
  "toplevel/second/mykey"
in addition to the original:
  ("toplevel", "second", "mykey")

1 files changed, 15 insertions, 0 deletions

diff --git a/cloudinit/util.py b/cloudinit/util.py
index a192091f..385f231c 100644
--- a/cloudinit/util.py
+++ b/cloudinit/util.py
@@ -703,6 +703,21 @@ def get_cfg_option_list(yobj, key, default=None):
 # get a cfg entry by its path array
 # for f['a']['b']: get_cfg_by_path(mycfg,('a','b'))
 def get_cfg_by_path(yobj, keyp, default=None):
+    """Return the value of the item at path C{keyp} in C{yobj}.
+
+    example:
+      get_cfg_by_path({'a': {'b': {'num': 4}}}, 'a/b/num') == 4
+      get_cfg_by_path({'a': {'b': {'num': 4}}}, 'c/d') == None
+
+    @param yobj: A dictionary.
+    @param keyp: A path inside yobj.  it can be a '/' delimited string,
+                 or an iterable.
+    @param default: The default to return if the path does not exist.
+    @return: The value of the item at keyp."
+        is not found."""
+
+    if isinstance(keyp, six.string_types):
+        keyp = keyp.split("/")
     cur = yobj
     for tok in keyp:
         if tok not in cur: