[Qemu-devel] [Bug 770173] Re: /etc/qemu-ifup is not executed

[Carlos Eduardo Moreira dos Santos]

That's not what is written in documentation. http://www.linux-
kvm.org/page/Networking) makes clear that /etc/qemu-ifup is executed by
qemu to create a tap interface. My script /etc/qemu-ifup-sudo is based
on the doc's one and my user has the ability to create tap devices using
sudo. In fact, a device is created in the first post if the script is
called manually.

If the bug is in the documentation and we must create tap devices before
calling qemu, where is the best place to discover the first non-existent
tapX device and create it?

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https://bugs.launchpad.net/bugs/770173

Title:
  /etc/qemu-ifup is not executed

Status in QEMU:
  Invalid

Bug description:
  The following does not work:
  $ qemu -m 512 -drive file=arch_min.qcow2,if=virtio,boot=on -nographic -net 
nic,model=virtio -net tap,script=/etc/qemu-ifup
  warning: could not configure /dev/net/tun: no virtual network emulation

  However, this works:
  $ /etc/qemu-ifup tap0
  $ kvm -m 512 -drive file=arch_min.qcow2,if=virtio,boot=on -nographic -net 
nic,model=virtio -net tap,ifname=tap0,script=no,downscript=no
  $ /etc/qemu-ifdown tap0

  Other info:

  - qemu 0.12.5
  - ubuntu 10.10

  $ ls -l /etc/qemu-ifup
  lrwxrwxrwx 1 root root  18 2011-03-26 15:57 /etc/qemu-ifup -> 
/usr/bin/qemu-ifup*

  $ cat /etc/qemu-ifup
  #!/bin/sh

  #switch=$(/sbin/ip route list | awk '/^default / { print $5 }')
  #/sbin/ifconfig $1 0.0.0.0 up
  #/usr/sbin/brctl addif ${switch} $1

  set -x

  switch=br0

  if [ -n "$1" ];then
    /usr/bin/sudo /etc/qemu-ifup-sudo $1 `whoami`
    exit 0
  else
    echo "Error: no interface specified"
    exit 1
  fi

  $ cat /etc/qemu-ifup-sudo
  #!/bin/sh

  set -x

  switch=br0

  /usr/sbin/tunctl -u $2 -t $1
  /usr/bin/sudo /sbin/ip link set $1 up
  sleep 0.5s
  /usr/bin/sudo /usr/sbin/brctl addif $switch $1