Hey, sorry for not getting back to you quicker. The log shows that on
that particular request, the server's response doesn't include the MD5,
so I think Ian is right that this is more of a Glance problem than it is
an SDK problem. I'm going to add Glance in here so perhaps they can take
a look.
** Also affects: glance
Importance: Undecided
Status: New
** Changed in: python-openstacksdk
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1619675
Title:
Glance does not return image MD5
Status in Glance:
New
Status in OpenStack SDK:
Invalid
Bug description:
I'm trying to download an OpenStack image from glance using only the
Openstack Python SDK, but I only get this error:
Traceback (most recent call last):
File "/home/openstack/discovery/discovery.py", line 222, in <module>
main(sys.argv[1:])
File "/home/openstack/discovery/discovery.py", line 117, in main
image_service.download_image(image)
File "/usr/local/lib/python2.7/dist-packages/openstack/image/v2/_proxy.py",
line 72, in download_image
return image.download(self.session)
File "/usr/local/lib/python2.7/dist-packages/openstack/image/v2/image.py",
line 166, in download
checksum = resp.headers["Content-MD5"]
File "/usr/local/lib/python2.7/dist-packages/requests/structures.py", line
54, in __getitem__
return self._store[key.lower()][1]
KeyError: 'content-md5'
The weird part is that if I run the code using an IDE (PyCharm with
remote debug) or as a script (python script.py -i ...) I get the
error, but if I run each line using a python interpreter
(ipython/python) the error does not happen! Have no idea why.
Here is the code I'm using:
...
image_name = node.name + "_" + time.strftime("%Y-%m-%d_%H-%M-%S")
print "Getting data from", node.name
compute_service.create_server_image(node, image_name)
image = image_service.find_image(image_name)
image_service.wait_for_status(image, 'active')
fileName = "%s.img" % image.name
with open(str(fileName), 'w+') as imgFile:
imgFile.write(image.download(conn.image.session))
...
This code ends up calling the API in this file
/usr/local/lib/python2.7/dist-packages/openstack/image/v2/image.py,
with this method:
def download(self, session):
"""Download the data contained in an image"""
# TODO(briancurtin): This method should probably offload the get
# operation into another thread or something of that nature.
url = utils.urljoin(self.base_path, self.id, 'file')
resp = session.get(url, endpoint_filter=self.service)
checksum = resp.headers["Content-MD5"]
digest = hashlib.md5(resp.content).hexdigest()
if digest != checksum:
raise exceptions.InvalidResponse("checksum mismatch")
return resp.content
The resp.headers variable has no key "Content-MD5". This is the value
I found for it:
{'Date': 'Thu, 01 Sep 2016 20:17:01 GMT', 'Transfer-Encoding': 'chunked',
'Connection': 'keep-alive', 'Content-Type': 'application/octet-stream',
'X-Openstack-Request-Id': 'req-9eb16897-1398-4ab2-9cd4-45706e92819c'}
But according to the REST API documentationm the response should
return with the key Content-MD5: http://developer.openstack.org/api-
ref/image/v2/?expanded=download-binary-image-data-detail
If I just comment the MD5 check the download works fine, but this is
inside the SDK so I can't/shouldn't change it. Anyone have any
suggestion on how to achieve this using the OpenStack Python SDK? Is
this an SDK bug?
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