[Bug 45443] New: Tests fail on recent Linux: tubes/accept-*-stream-tube.py

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https://bugs.freedesktop.org/show_bug.cgi?id=45443

             Bug #: 45443
           Summary: Tests fail on recent Linux:
                    tubes/accept-*-stream-tube.py
    Classification: Unclassified
           Product: Telepathy
           Version: git master
          Platform: Other
        OS/Version: All
            Status: ASSIGNED
          Severity: normal
          Priority: medium
         Component: gabble
        AssignedTo: simon.mcvittie at collabora.co.uk
        ReportedBy: simon.mcvittie at collabora.co.uk
         QAContact: telepathy-bugs at lists.freedesktop.org


Recent Linux has this commit:

commit 16e5726269611b71c930054ffe9b858c1cea88eb
Author: Eric Dumazet <eric.dumazet at gmail.com>
Date:   2011-09-19 05:52:27 +0000

    af_unix: dont send SCM_CREDENTIALS by default

    Since commit 7361c36c5224 (af_unix: Allow credentials to work across
    user and pid namespaces) af_unix performance dropped a lot.
...
    This patch includes SCM_CREDENTIALS information in a af_unix message/skb
    only if requested by the sender, [man 7 unix for details how to include
    ancillary data using sendmsg() system call]

    Note: This might break buggy applications that expected SCM_CREDENTIAL
    from an unaware write() system call, and receiver not using SO_PASSCRED
    socket option.

    If SOCK_PASSCRED is set on source or destination socket, we still
    include credentials for mere write() syscalls.

so we need to do at least one of these:

* teach the Python (Twisted) code to send ancillary data
  (probably somewhat difficult)

* have Gabble enable SO_PASSCRED before telling the Tubes client
  about the socket, instead of enabling it just in time for the relevant
  read, and keep it enabled until the creds have been passed

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