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Description of problem:
When specifying repositories to enable, but none to disable, a 'NoneType' python exception is thrown causing cloud-init to fail.

I've submitted this PR upstream as a fix:
https://github.com/cloud-init/cloud-init/pull/9

Version-Release number of selected component (if applicable):
cloud-init 0.7.9


How reproducible:
Always


Steps to Reproduce:
1. Create a cloud-init user-data with the following rh_subscription module options

  rh_subscription:
    username: <username>
    password: <password>
    add-pool: [ <pool-id> ]
    enable-repo: [ 'rhel-7-server-extras-rpms' ]

2. Attempt to create a machine using cloud-init.

Actual results:
A 'NoneType' python exception is thrown when attempting to iterate on the disable-repo array (called "drepos" in the code), since the disable-repo option wasn't specified in the cloud-init user-data.

Expected results:
disable-repo is ignored and cloud-init rh_subscription module runs successfully.

Additional info:
A workaround is to add an empty array for the disable-repos options.

Upstream for cloud-init is at https://launchpad.net/cloud-init

I'm not sure if anybody is monitoring the github mirror. You'll probably want to open an issue and submit the patch there.

Thanks Ryan! I've submitted the PR to launchpad:

https://code.launchpad.net/~dmulford/cloud-init/+git/cloud-init/+merge/332030

Thanks. I will keep an eye on it and pull it in here once it is accepted.

I had to resubmit the upstream PR as requested by Scott Moser.

Here is the new URL:
https://code.launchpad.net/~dmulford/cloud-init/+git/cloud-init/+merge/333293

Thanks for the heads-up. I will keep an eye on that.

Hi Ryan,
I have added a comment on the PR.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0806