[Bug 1620407] Re: vm startup broken when interface definition has script tag

[Matthias Ferdinand]

On Thu, Feb 02, 2017 at 05:36:33PM -0000, ChristianEhrhardt wrote:
> By parsing through changes my gut feeling expects:
> 9c17d665fdc5f "autocreate tap device for ethernet network type"

Sounds very interesting, might even remove the need for the separate
daemon we run for interface creation.

Matthias

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Title:
  vm startup broken when interface definition has script tag

Status in libvirt package in Ubuntu:
  Fix Released
Status in libvirt source package in Xenial:
  Triaged

Bug description:
  Ubuntu 16.04.1 LTS (amd64)
  libvirt-bin 1.3.1-1ubuntu10.1

  We use external scripts to setup tap interfaces, e.g.

      <interface type='ethernet'>
        <mac address='52:54:00:18:0d:a3'/>
        <script path='/etc/libvirt/14v/mf_testet.sh'/>
        <target dev='mf_testet'/>
        <model type='virtio'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
      </interface>

  Starting the VM throws an error message ("interface not found" or
  something like that).

  IIUC, the script invocation is done by qemu, so the interface
  may not yet exist when libvirt is constructing the qemu cmd args.
  Checking for that interface in advance therefore is a bug.

  Attached patch skips the check if a <script> parameter is provided.

  Regards
  Matthias Ferdinand

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