Cinderlib does not support Cinder drivers that make use of the privsep
library.
Originally privsep had a limitation that would serialize all requests,
so slow operations would create a bottleneck, thus cinderlib decided not
to use privsep and call the commands directly.
Since privsep no longer serializes requests we stop going around privsep
and use it.
Cinderlib is a library that works when run in a virtual environment, so
we must maintain backward compatibiliy and still support it, which is
problematic, because with Cinder's rootwrap+privsep we require
/etc/cinder/rootwrap.conf and /etc/cinder/rootwrap.d to exist, but under
a virtual env these are installed in the virtualenv's etc
directory instead. For example: .tox/py37/etc/cinder/rootwrap.conf
This configuration file is modified to point to the right filters
directory and add the virtual env's bin directory to exec_dirs.
We also take into account if we have installed cinder as editable in our
virtual environment, because in that case files are not installed, and
we will copy them from the source's directory into the virtual
environment so we can freely modify them.
Depends-On: https://review.opendev.org/737312
Closes-Bug: #1883720
Change-Id: I7963fbfbb0a683e3efcc5949f80b96e5daaa18f1
cf638c41f6