diff options
Diffstat (limited to 'nova/virt/libvirt/driver.py')
| -rw-r--r-- | nova/virt/libvirt/driver.py | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py index 5d1caf34f6..da98829453 100644 --- a/nova/virt/libvirt/driver.py +++ b/nova/virt/libvirt/driver.py @@ -2880,7 +2880,16 @@ class LibvirtDriver(driver.ComputeDriver): # If the rebased image is going to have a backing file then # explicitly set the backing file format to avoid any security # concerns related to file format auto detection. - backing_file = rebase_base + if os.path.isabs(rebase_base): + backing_file = rebase_base + else: + # this is a probably a volume snapshot case where the + # rebase_base is relative. See bug + # https://bugs.launchpad.net/nova/+bug/1885528 + backing_file_name = os.path.basename(rebase_base) + volume_path = os.path.dirname(source_path) + backing_file = os.path.join(volume_path, backing_file_name) + b_file_fmt = images.qemu_img_info(backing_file).file_format qemu_img_extra_arg = ['-F', b_file_fmt] |