run "nova evacuate" command, 'can't be encoded'error

[YaoZheng_ZTE]

I have some trouble when run 'nova evacuate'command
details:
1.I have two hosts, host1 is controler and conpute services, host2 is only compute service
2.stop the host2's compute service
3.run 'nova evacuate'command on the host1, return error
the host1's compute log:

| created | 2014-08-17T10:41:50Z |
| fault | {"message": "<type 'NoneType'> can't be encoded", "code": 500, "details": " File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 305, in decorated_function |
| | return function(self, context, *args, **kwargs) |
| | File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 2498, in rebuild_instance |
| | image_meta = _get_image_meta(context, image_ref) |
| | File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 432, in _get_image_meta |
| | return image_service.show(context, image_id) |
| | File \"/usr/lib/python2.7/site-packages/nova/image/glance.py\", line 270, in show |
| | image = self._client.call(context, 1, 'get', image_id) |
| | File \"/usr/lib/python2.7/site-packages/nova/image/glance.py\", line 270, in show |
| | image = self._client.call(context, 1, 'get', image_id) |
| | File \"/usr/lib/python2.7/site-packages/nova/image/glance.py\", line 209, in call |
| | return getattr(client.images, method)(*args, **kwargs) |
| | File \"/usr/lib/python2.7/site-packages/glanceclient/v1/images.py\", line 114, in get |
| | % urllib.quote(str(image_id))) |
| | File \"/usr/lib/python2.7/site-packages/glanceclient/common/http.py\", line 289, in raw_request |
| | return self._http_request(url, method, **kwargs) |
| | File \"/usr/lib/python2.7/site-packages/glanceclient/common/http.py\", line 191, in _http_request |
| | kwargs['headers'] = self.encode_headers(kwargs['headers']) |
| | File \"/usr/lib/python2.7/site-packages/glanceclient/common/http.py\", line 166, in encode_headers |
| | return dict([(to_str(h), to_str(v)) for h, v in headers.iteritems()]) |
| | File \"/usr/lib/python2.7/site-packages/glanceclient/openstack/common/strutils.py\", line 137, in safe_encode |
| | raise TypeError(\"%s can't be encoded\" % type(text)) |
| | ", "created": "2014-08-17T11:22:04Z"} |
| flavor | m1.tiny (1df8ba6d-6c91-493d-9602-219b769709f8) |
| hostId | 36ca539f1fd65bfb2a3f57ad6a6471b405f7065b5ff0f23ef0aa56a6 |
| id | 5b413785-afdc-4d9e-8649-fe3596168b30 |
| image | cirros (d9af9100-8fde-463b-aa43-25c656e464b5)

[YaoZheng_ZTE (zheng-yao1)]

At present, I change the /usr/lib/python2.7/site-packages/glanceclient/openstack/common/strutils.py safe_encode function
and avoid this issue.
e.g:
def safe_encode(text, incoming=None,
                encoding='utf-8', errors='strict'):
=>
def safe_encode(text, incoming=None,
                encoding='utf-8', errors='ignore'):

"errors" from 'strict' to 'ignore'

[YaoZheng_ZTE (zheng-yao1)]

now, the "nova evacuate" command can not run, my work cannot continue.
if community is not intend fix , how can I avoid this issue?

[Mark Washenberger (markwash)]

Yao Zheng,

The previous modifications were just to redirect this bug to the correct project (python-glanceclient is the most likely culprit at this point).

It looks like somehow the _request method in glanceclient.common.http is ending up being passed a header that has None as the value. Is there any way you can reproduce this problem but edit the line right above
> headers = self.encode_headers(headers)
to print out or log the headers, and include the results here?

[Ian Cordasco (icordasc)]

This issue has been marked incomplete for over two years. Marking it as invalid since a lot of our header coercion logic has changed for the better.