failed to copy volume to image

[zhangsong]

When I try to upload volume to image in horizon, an error occurred like this :

'''
2015-11-09 07:57:04.777 26189 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/cinder/cinder/image/image_utils.py", line 129, in _convert_image
2015-11-09 07:57:04.777 26189 ERROR oslo_messaging.rpc.dispatcher fsz_mb = os.stat(source).st_size / units.Mi
2015-11-09 07:57:04.777 26189 ERROR oslo_messaging.rpc.dispatcher OSError: [Errno 2] No such file or directory: 'sheepdog:10.133.17.61:7000:volume-a0a70f9b-a50e-4369-885f-c41a894c9fe5'
'''

I use sheepdog as cinder backend.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/243152

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/243152
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=53073d19217778d6af48e9eb7d8f96ca7a92b931
Submitter: Jenkins
Branch: master

commit 53073d19217778d6af48e9eb7d8f96ca7a92b931
Author: zhangsong <email address hidden>
Date: Mon Nov 9 23:00:08 2015 +0800

    Fix the bug of OSError when convert image

    When I try to convert a image use image_utils.convert_image() method,
    an error occurred like this :
    '''
    OSError: [Errno 2] No such file or directory:
    'sheepdog:10.133.17.61:7000:volume-a0a70f9b-a50e-4369-885f-c41a894c9fe5'
    '''
    The reason is that in some cluster storage systems, like
    ceph/sheepdog, QEMU can access an image directly via their private
    protocol, and there’s no need to map an image as a block device on
    the host. In this case, the qemu-img convert command may like:

        #qemu-img convert -O raw sheepdog:Ip:port:image_name temp_file
        #qemu-img convert -O raw rbd:pool_name/image_name temp_file

    The source path may be 'sheepdog:Ip:port:image_name' or
    'rbd:pool_name/image_name', it doesn't exist in OS. So, when it runs
    the os.stat(source) in image_utils.convert_image(source,dest,out_format)
    method, an OSError would be raised.

    We can use qemu_img_info method instead to resolve this problem, because
    the 'qemu-img info' command can always get the image size info which has
    support qemu-img tool. Here we capture a ValueError just in case, but it
    only need to give a warning message, because the image has been successfully
    converted.

    Change-Id: I5fd1e51840972a67053b85a76f8e001fa8148ad7
    Closes-Bug: #1514442

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/cinder 8.0.0.0b1 development milestone.