yahoo-eng-team team mailing list archive

[Ignasi Barrera <1691356@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When using the vendor data to configure a set of cloud-init directives,
if the YAML document contains multiline strings, the rendered vendor-
data.txt file has an invalid format.

According to the OpenStack vendor data format, used in the OpenStack and
ConfigDrive data sources, the vendor data file is a JSON file that might
contain a "cloud-init" attribute that is parsed using the same handlers
as the user data:
http://cloudinit.readthedocs.io/en/latest/topics/datasources/openstack.html
#vendor-data

When that configuration is a "#cloud-config" YAML document with
multiline strings (for example a validation certificate commonly used in
the Chef module), the resulting vendor-data.txt is generated with
invalid values for all multiline string values.

The issue is probably in the "safeyaml" utility class, that uses default settings to process the YAML documents:
https://git.launchpad.net/cloud-init/tree/cloudinit/safeyaml.py?id=0.7.9

But Python does not properly handle multiline strings by default:
http://stackoverflow.com/questions/6432605/any-yaml-libraries-in-python-that-support-dumping-of-long-strings-as-block-liter

** Affects: cloud-init
     Importance: Undecided
         Status: New


** Tags: configdrive openstack vendordata

** Tags added: configdrive

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https://bugs.launchpad.net/bugs/1691356

Title:
  vendor data is not properly rendered if there are multiline strings

Status in cloud-init:
  New

Bug description:
  When using the vendor data to configure a set of cloud-init
  directives, if the YAML document contains multiline strings, the
  rendered vendor-data.txt file has an invalid format.

  According to the OpenStack vendor data format, used in the OpenStack
  and ConfigDrive data sources, the vendor data file is a JSON file that
  might contain a "cloud-init" attribute that is parsed using the same
  handlers as the user data:
  http://cloudinit.readthedocs.io/en/latest/topics/datasources/openstack.html
  #vendor-data

  When that configuration is a "#cloud-config" YAML document with
  multiline strings (for example a validation certificate commonly used
  in the Chef module), the resulting vendor-data.txt is generated with
  invalid values for all multiline string values.

  The issue is probably in the "safeyaml" utility class, that uses default settings to process the YAML documents:
  https://git.launchpad.net/cloud-init/tree/cloudinit/safeyaml.py?id=0.7.9

  But Python does not properly handle multiline strings by default:
  http://stackoverflow.com/questions/6432605/any-yaml-libraries-in-python-that-support-dumping-of-long-strings-as-block-liter

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