[Pkg-libvirt-maintainers] Bug#721412: libvirt-bin: wrong path to xen pygrub in xml config file, paravirtualized guest failed to start

[Desgranges Arnaud]

Package: libvirt-bin
Version: 0.9.12-11+deb7u1
Severity: normal

Dear Maintainer,
*** Please consider answering these questions, where appropriate ***

   * What led up to the situation?

   When i create a xen paravirtualized guest it failed to start with this error :
Erreur lors du démarrage du domaine: POST operation failed: xend_post: error from xen daemon: (xend.err "Bootloader isn't executable")

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 66, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1114, in startup
    self._backend.create()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 620, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: POST operation failed: xend_post: error from xen daemon: (xend.err "Bootloader isn't executable")

I search on google and find this bug on opensuse mailing list : 
http://lists.opensuse.org/opensuse-bugs/2013-01/msg00761.html

so i dump my xml config file :

virsh # dumpxml internet
<domain type='xen' id='17'>
  <name>internet</name>
  <uuid>3fff84b4-4a5c-bebc-7184-b12f00762e56</uuid>
  <memory unit='KiB'>786432</memory>
  <currentMemory unit='KiB'>786432</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <bootloader>/usr/lib/xen-default/bin/pygrub</bootloader>
  <os>
    <type>linux</type>
  </os>
  <clock offset='utc' adjustment='reset'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/lib/xen-4.1/bin/qemu-dm</emulator>
    <disk type='block' device='disk'>
      <driver name='phy'/>
      <source dev='/dev/vg/Xen_internet'/>
      <target dev='xvda' bus='xen'/>
    </disk>
    <interface type='bridge'>
      <mac address='00:16:3e:56:4f:76'/>
      <source bridge='xenbr0'/>
      <script path='/etc/xen/scripts/vif-bridge'/>
      <target dev='vif17.0'/>
    </interface>
    <console type='pty' tty='/dev/pts/2'>
      <source path='/dev/pts/2'/>
      <target type='xen' port='0'/>
    </console>
    <input type='mouse' bus='xen'/>
    <graphics type='vnc' port='5900' autoport='yes' keymap='fr'/>
  </devices>
</domain>

virsh #

i saw that the path to pygrub is wrong : /usr/lib/xen-default/bin/pygrub instead of /usr/lib/xen-4.1/bin/pygrub
that causes the vm to not start.

As a more generic workaround i create a symlink like this : 

ln -s /usr/lib/xen-4.1/ /usr/lib/xen-default

Now i can start paravirtualized guest successfuly :)

It would be great if it can be corrected. Thanks in advance ;)

   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   * What was the outcome of this action?
   * What outcome did you expect instead?

*** End of the template - remove these lines ***


-- System Information:
Debian Release: 7.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.10.9-8-atom (SMP w/1 CPU core)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages libvirt-bin depends on:
ii  adduser             3.113+nmu3
ii  gettext-base        0.18.1.1-9
ii  libavahi-client3    0.6.31-2
ii  libavahi-common3    0.6.31-2
ii  libblkid1           2.20.1-5.3
ii  libc6               2.13-38
ii  libcap-ng0          0.6.6-2
ii  libdbus-1-3         1.6.8-1+deb7u1
ii  libdevmapper1.02.1  2:1.02.74-7
ii  libgcrypt11         1.5.0-5+deb7u1
ii  libgnutls26         2.12.20-7
ii  libnetcf1           0.1.9-2
ii  libnl1              1.1-7
ii  libnuma1            2.0.8~rc4-1
ii  libparted0debian1   2.3-12
ii  libpcap0.8          1.3.0-1
ii  libpciaccess0       0.13.1-2
ii  libreadline6        6.2+dfsg-0.1
ii  libsasl2-2          2.1.25.dfsg1-6+deb7u1
ii  libudev0            175-7.2
ii  libvirt0            0.9.12-11+deb7u1
ii  libxenstore3.0      4.1.4-3+deb7u1
ii  libxml2             2.8.0+dfsg1-7+nmu1
ii  libyajl2            2.0.4-2
ii  logrotate           3.8.1-4

Versions of packages libvirt-bin recommends:
ii  bridge-utils    1.5-6
ii  dmidecode       2.11-9
ii  dnsmasq-base    2.62-3+deb7u1
ii  ebtables        2.0.10.4-1
ii  gawk            1:4.0.1+dfsg-2.1
ii  iproute         20120521-3+b3
ii  iptables        1.4.14-3.1
ii  libxml2-utils   2.8.0+dfsg1-7+nmu1
ii  netcat-openbsd  1.105-7
ii  parted          2.3-12
ii  qemu-kvm        1.1.2+dfsg-6

Versions of packages libvirt-bin suggests:
pn  policykit-1  <none>
ii  radvd        1:1.8.5-1

-- no debconf information