Description of problem:
After a recent libvirt update, ruby code that we use to build a storage pool now fails. This worked prior to the update. Specifying the BUILD_NO_OVERWRITE or BUILD_OVERWRITE flags when building the pool do not help.

Version-Release number of selected component (if applicable):
Debian package version 1.2.16-2. Ruby bindings are at version 0.5.1-3+b2. The breakage was seen when libvirt was updated.


How reproducible:
Every time

Steps to Reproduce:
1. Using the ruby bindings, try to build a pool when the storage path already exists. 
2.
3.

Actual results:
Fails with 

Call to virStoragePoolBuild failed: failed to create directory '/home/kytv/git/tails/tmp/TailsToasterStorage': File exists (Libvirt::Error)


Expected results:
Continuing as it previously did.

Additional info:

The code we're using (which used to work) can be found at https://git-tails.immerda.ch/tails/tree/features/support/helpers/storage_helper.rb

In our codebase, I've tried using 

    pool.build(Libvirt::StoragePool::BUILD_NO_OVERWRITE)

and 

    pool.build(Libvirt::StoragePool::BUILD_OVERWRITE)

and it still fails.

Tails has a bug for this problem at https://labs.riseup.net/code/issues/9568