[Bug 950409] Re: ifup fails but returns 0

[RazorX]

Okay... Well, I think it should be noted that this causes Xen to not
properly setup the bridge.  So out of the box Xen will be broken when
going to bridge route.  I guess I'll bring it up with the Xen project
and see if maybe they want to do things a bit differently.

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https://bugs.launchpad.net/bugs/950409

Title:
  ifup fails but returns 0

Status in “ifupdown” package in Ubuntu:
  Won't Fix

Bug description:
  This is from the packaged xen script 'network-bridge'.

  do_ifup() {
      #if [ $1 != "${netdev}" ] || ! ifup $1 ; then
          if [ -n "$addr_pfx" ] ; then
              # use the info from get_ip_info()
              ip addr flush $1
              ip addr add ${addr_pfx} dev $1
          fi
          ip link set dev $1 up
          [ -n "$gateway" ] && ip route add default via ${gateway}
      #fi
  }

  I needed to comment out the encasing 'if' because ifup exits 0 even
  though it fails.  It throws a RETLINK error due to an ip existing on
  the interface, but $? = 0.  This causes the rest to fail and the
  bridge is not properly established.

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