DataSourceConfigDrive: consider CD rom as valid config-drive source.

previously, there was an attempt in the config drive source to limit
the source device to a "full block device" rather than a partition.

This was done by a simplistic approach of checking that the last 
character of the name was not a number.  That was filtering out
CD-rom devices (sr0).

Now, we have a bit more sophisticated approach to that same problem.
We filter out block devices that have a 'partition' entry in
/sys/class/block/DEVICE_NAME/partition .

LP: #1100545

1 files changed, 7 insertions, 0 deletions

diff --git a/cloudinit/util.py b/cloudinit/util.py
index ab918433..c0ea8d91 100644
--- a/cloudinit/util.py
+++ b/cloudinit/util.py
@@ -1553,3 +1553,10 @@ def keyval_str_to_dict(kvstring):
             val = True
         ret[key] = val
     return ret
+
+
+def is_partition(device):
+    if device.startswith("/dev/"):
+        device = device[5:]
+
+    return os.path.isfile("/sys/class/block/%s/partition" % device)