Poor error message when glance CLI options out of order

[rick jones]

I happened to try to download an image, and got a rather inscrutable error message:

(venv)cetest@cer405n0046:~/rjones2$ glance image-download 65b8c8d0-ac4f-4aae-9149-64aa3e31d926 --file netperf_1410_image.qcow2 --progress
object of type 'generator' has no len()

When it was suggested to me that I had the options in the wrong order I was able to get the command to succeed:

(venv)cetest@cer405n0046:~/rjones2$ glance image-download --file netperf_1410_image.qcow2 65b8c8d0-ac4f-4aae-9149-64aa3e31d926
(venv)cetest@cer405n0046:~/rjones2$ ls -l net*
-rw-rw-r-- 1 cetest cetest 1292894208 Apr 9 18:35 netperf_1410_image.qcow2

That error message from the first attempt is completely inscrutable and in no way leads someone towards their mistake. Certainly not anyone who might be classified a "civilian."

[Louis Taylor (kragniz)]

What version of glanceclient are you running? It seem like you're hitting this bug: https://bugs.launchpad.net/python-glanceclient/+bug/1384664

[rick jones (rick-jones2)]

Oops - meant to include that -

0.14.1.11

[Atul Pandey (atul-4you)]

I think this bugs talks about error message otherwise we can mark it as duplicate of https://bugs.launchpad.net/python-glanceclient/+bug/1384664

[Louis Taylor (kragniz)]

Okay, could you update python-glanceclient and confirm it's fixed in versions greater than 0.15.0?

[rick jones (rick-jones2)]

I don't have direct control over the environments, but I was able to find an environment with 0.17.0 installed. Sadly, it seems to encounter a different issue:

(venv)cetest@qa-aw1hel-node0003:~/rjones2$ glance image-download 74e4d736-afcb-46f9-8bf6-d6a33ff09e73 --file foo.qcow2 --progress
"1" is not a supported API version. Example values are "1" or "2".
(venv)cetest@qa-aw1hel-node0003:~/rjones2$ glance --version
0.17.0

which may already be logged as another ticket. As this "new" (and seemingly equally unhelpful :) ) message happens with the command that was working in the 0.14.1.11 environment I assume this is more "fundamental" and so I cannot really say if the later version addresses the bogus error message reported in this ticket.

(venv)cetest@qa-aw1hel-node0003:~/rjones2$ glance --file foo.ccow2 image-download 74e4d736-afcb-46f9-8bf6-d6a33ff09e73
"1" is not a supported API version. Example values are "1" or "2".

[Kamil Rykowski (kamil-rykowski)]

@rick: You got similar issue to the one reported here - https://bugs.launchpad.net/glance/+bug/1402632

Could you run for example the following command and check if there are no import errors:
glance --os-image-api-version 2 image-list

The bug for printing proper error message is still in progress and its driven by Stuart McLaren at https://review.openstack.org/#/c/171180/

[rick jones (rick-jones2)]

The environments around me are in a semi-constant state of flux so getting the same version of glance each time is rare.

$ glance --os-image-api-version 2 image-list
"2" is not a supported API version. Example values are "1" or "2".
$ glance --version
0.16.1

There is another which has 0.18.0:
$ glance --version
0.18.0
$ glance --os-image-api-version 2 image-list
+----+------+
| ID | Name |
+----+------+
+----+------+

a plain glance image-list in the environment with 0.18.0 showed a number of images, as did using --os-image-api-version 1.

[Ian Cordasco (icordasc)]

I believe Stuart's work has fixed this up. Closing this as fixed released. If that assessment is incorrect, feel free to comment here and we can fix that up.