write_files errors out on non ascii content

[Tite]

When trying to add content in the write_files an error is thrown:

2015-08-23 10:37:54,678 - util.py[WARNING]: Running write_files (<module 'cloudinit.config.cc_write_files' from '/usr/lib/python2.7/site-packages/cloudinit/config/cc_write_files.pyc'>) failed

The cloud-config file is attached.

When searching for the root cause, found to be an error raised in line 95 of cloudinit/config/cc_write_files.py
"""
def extract_contents(contents, extraction_types):
    result = str(contents)
    for t in extraction_types:
"""

The conversion from unicode to string throws an exception. I tested this by using a plain script:
"""
#!/bin/python

import yaml
f=open("/etc/salt-cloud/cloud.deploy.d/userdata_strbug.txt","r")
conf = yaml.load(f)

print "Testing write_files bug ... "
for c in conf['write_files']:
  print "Content to string: ",str(c['content'])
"""

With this output:
"""
Testing write_files bug ...
Content to string:
Traceback (most recent call last):
  File "utils/misc/test-yaml-bug.py", line 9, in <module>
    print "Content to string: ",str(c['content'])
UnicodeEncodeError: 'ascii' codec can't encode character u'\xf3' in position 1087: ordinal not in range(128)
"""

Line 40 of the configuration file, is the offending one, it's a comment.

[Scott Moser (smoser)]

This is fixed in trunk in revno 1199 (fixed with the fix for bug 1565638)

[Scott Moser (smoser)]

This is fixed in cloud-init 0.7.7

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/2574