[Bug 1545302] [NEW] wpa-roam broken by fix for ifupdown #1337873

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Sebastien Bacher (seb128):

The following versions of ifupdown introduced a recursion check using "IFUPDOWN_<interface>" environment variables along with a new locking mechanism for ifup (see #1337873):
0.7.47.2ubuntu4.2 (in Trusty)
0.7.54ubuntu1.1 (in Wily)
0.7.54ubuntu2 (in Xenial)

This recursion check breaks the wpa-roam feature of wpasupplicant,
preventing it from loading the logical interface specified by id_str
after associating with an AP.  Specifically, after upgrading to one of
the above ifupdown versions, the '/sbin/ifup -v --force
"$WPA_IFACE=$WPA_LOGICAL_IFACE"' command run by wpa_action in
functions.sh fails with an "ifup: recursion detected for parent
interface wlan0 in post-up phase" error.

To fix the issue, functions.sh needs to run `unset "IFDOWN_$WPA_IFACE"`
before calling /sbin/ifup to prevent ifup from detecting the recursion.
The attached patch implements this change.

** Affects: wpa (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: patch
-- 
wpa-roam broken by fix for ifupdown #1337873
https://bugs.launchpad.net/bugs/1545302
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