Comment 2 for bug 1885003

Reviewed: https://review.opendev.org/739403
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=72510f9ce90970e75a95492c7647fd63ac2636dc
Submitter: Zuul
Branch: stable/ussuri

commit 72510f9ce90970e75a95492c7647fd63ac2636dc
Author: Abhishek Kekane <email address hidden>
Date: Wed Jun 24 19:44:54 2020 +0000

    Fix: Interrupted copy-image leaking data on subsequent operation

    If copying existing image in other stores fails while staging the data to
    staging directory due to power, network or any other reason. Then
    subsequent try may lead to data leaks in stores.

    To fix this, added check of the actual image size with the size
    of image file present in the staging area. If it does not match
    then delete the image file from staging area so that the entire
    image will be staged again.

    Change-Id: I44bfefb6eee421e18e5e95a0dafaef0ea4e170da
    Closes-Bug: #1885003
    (cherry picked from commit 22d8f1fcbf4325d79ac18adfe87198c785f1df52)