Comment 3 for bug 1340776

Reviewed: https://review.openstack.org/119381
Committed: https://git.openstack.org/cgit/openstack/tripleo-image-elements/commit/?id=e20862dfed707a1b534e6cd953a673eff7ffa4b4
Submitter: Jenkins
Branch: master

commit e20862dfed707a1b534e6cd953a673eff7ffa4b4
Author: Eamonn O'Toole <email address hidden>
Date: Fri Sep 5 15:07:18 2014 +0100

    Fix swift object-server cffi version mismatch bug

    This patch is to fix a recent issue that we saw with Swift in
    the overcloud. The basic problem is a version mismatch between
    the version of cffi installed in the Swift venv and the version
    of cffi for which the python xattr module in the Swift venv
    has pre-built support. The version of xattr installed has
    pre-built support for cffi 0.8.2, whereas cffi 0.8.6 is installed.
    Because of this, at swift-object start-up the cffi 0.8.6 module
    attempts to build the appropriate C file in the python xattr
    directory and fails because it doesn't have write permission
    on the python xattr directory. The reason is that the Swift venv
    is installed by root, whereas Swift is run as the "swift" user.

    To fix this we've added a new module 76-swift-cffi which is run at
    install time and executes a simple python command:

    from xattr import getxattr, setxattr

    in the Swift venv. This forces a build of the correct cffi library
    in the xattr module.

    Change-Id: Ied7cbd1db2bf5a0638324dcb8ac7135d03ed9aad
    Closes-Bug: #1340776