[Bug 1492420] [NEW] ConfigDrive datasource fails when metadata files is null

[Ben Howard]

Public bug reported:

On Ubuntu 12.04, cloud-init fails to provision when ConfigDrive data has
a null value for "files":


Sep  4 18:46:28 utl-precise-0904-88f2e9 [CLOUDINIT] __init__.py[WARNING]: get_data of DataSourceConfigDriveNet raised Failed to read file []: list indices must be integers, not str
Sep  4 18:46:28 utl-precise-0904-88f2e9 [CLOUDINIT] util.py[DEBUG]: Traceback (most recent call last):#012  File "/usr/lib/python2.7/dist-packages/cloudinit/__init__.py", line 215, in get_data_source#012    if s.get_data():#012  File "/usr/lib/python2.7/dist-packages/cloudinit/DataSourceConfigDrive.py", line 138, in get_data#012    results = read_config_drive_dir(self.seed_dir)#012  File "/usr/lib/python2.7/dist-packages/cloudinit/DataSourceConfigDrive.py", line 321, in read_config_drive_dir#012    data = finder(source_dir)#012  File "/usr/lib/python2.7/dist-packages/cloudinit/DataSourceConfigDrive.py", line 392, in read_config_drive_dir_v2#012    raise BrokenConfigDriveDir("Failed to read file %s: %s" % (item, exc))#012BrokenConfigDriveDir: Failed to read file []: list indices must be integers, not str
Sep  4 18:46:28 utl-precise-0904-88f2e9 [CLOUDINIT] __init__.py[DEBUG]: Did not find data source. searched classes: ['DataSourceConfigDriveNet']
root at utl-precise-0904-88f2e9:/# 


meta_data.json:
{
    "domain": "foobar.com", 
    "files": [
        []
    ], 
    "hostname": "utl-precise-0904-88f2e9", 
    "meta": {
        "dsmode": "net"
    }, 
    "name": "utl-precise-0904-88f2e9", 
    "network_config": {
        "content_path": "/content/interfaces"
    }, 
    "public_keys": {
        "177313": "<REDACTED FOR READABILITY>"
    }, 
    "uuid": "9ba148b1-74d2-7f3f-2e8d-68746513d09f"
}

** Affects: cloud-init (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1492420

Title:
  ConfigDrive datasource fails when metadata files is null

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