stdin

I booted the instance using this command line:

    nova boot --image ubuntu-precise-x86_64 \
      --user_data ~/tmp/userdata.sh \
      --flavor m1.small lars-ubuntu-test

And `~/tmp/userdata` contained:

    #!/bin/sh

    echo This is a test. > /var/log/userdata.log

And upon booting it worked correctly (it created
`/var/log/userdata.log`), and in `/var/log/cloud-init.log` I see:

    2013-07-31 18:43:16,046 - cloud-init[INFO]: cloud-init start-local running: Wed, 31 Jul 2013 18:43:16 +0000. up 8.18 seconds
    2013-07-31 18:43:16,701 - __init__.py[DEBUG]: searching for data source in ['DataSourceNoCloud', 'DataSourceConfigDrive', 'DataSourceOVF']
    2013-07-31 18:43:16,800 - __init__.py[DEBUG]: Did not find data source. searched classes: ['DataSourceNoCloud', 'DataSourceConfigDrive', 'DataSourceOVF']
    2013-07-31 18:43:17,049 - cloud-init[INFO]: cloud-init start running: Wed, 31 Jul 2013 18:43:17 +0000. up 9.17 seconds
    2013-07-31 18:43:17,083 - __init__.py[DEBUG]: searching for data source in ['DataSourceNoCloudNet', 'DataSourceConfigDriveNet', 'DataSourceOVFNet', 'DataSourceMAAS', 'DataSourceEc2']
    2013-07-31 18:43:17,193 - DataSourceEc2.py[DEBUG]: removed the following from metadata urls: ['http://instance-data:8773']
    2013-07-31 18:43:17,452 - DataSourceEc2.py[DEBUG]: Using metadata source: 'http://169.254.169.254'