====== PyGrub – warning: grub-probe can’t find drive for /dev/xvda1 ======

==== Проблема ====

В Debian 6 Squeeze в Xen VPS не обновляется ядро.

Текст ошибки при ''apt-get upgrade''

<code>
Setting up linux-image-2.6.32-5-686-bigmem (2.6.32-48squeeze6) ...
Running depmod.
Running update-initramfs.
update-initramfs: Generating /boot/initrd.img-2.6.32-5-686-bigmem
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.32-5-686-bigmem /boot/vmlinuz-2.6.32-5-686-bigmem
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 2.6.32-5-686-bigmem /boot/vmlinuz-2.6.32-5-686-bigmem
Searching for GRUB installation directory ... found: /boot/grub
warning: grub-probe can't find drive for /dev/xvda1.
grub-probe: error: cannot find a GRUB drive for /dev/xvda1.  Check your device.map.
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-2.6.32-5-686-bigmem.postinst line 799, <STDIN> line 2.
dpkg: error processing linux-image-2.6.32-5-686-bigmem (--configure):
 subprocess installed post-installation script returned error exit status 2

---CUT---

Errors were encountered while processing:
 linux-image-2.6.32-5-686-bigmem
E: Sub-process /usr/bin/dpkg returned an error code (1)
</code>

==== Решение ====

Создаём блочное устройство

<code>
# echo '(hd0) /dev/xvda' > /boot/grub/device.map
# mknod /dev/xvda b 202 0
</code>

Редактируем файл ''/usr/sbin/update-grub''\\

Меняем код

<code>
find_device ()
{
if ! test -e ${device_map} ; then
echo quit | grub --batch --no-floppy --device-map=${device_map} > /dev/null
fi
grub-probe --device-map=${device_map} -t device $1 2> /dev/null
}
</code>

на

<code>
find_device ()
{
if ! test -e ${device_map} ; then
echo quit | grub --batch --no-floppy --device-map=${device_map} > /dev/null
fi
#grub-probe --device-map=${device_map} -t device $1 2> /dev/null
echo /dev/xvda
}
</code>

Обновляем grub

<code>
# update-grub 0

Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... Generating /boot/grub/default file and setting the default boot entry to 0
Searching for GRUB installation directory ... found: /boot/grub
Testing for an existing GRUB menu.lst file ... 


Generating /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-2.6.32-5-686-bigmem
Updating /boot/grub/menu.lst ... done
</code>

Исправляем ''menu.lst''

<code>
# sed -i "s/xvda/xvda1/g" /boot/grub/menu.lst
</code>

После чего ''apt-get upgrade'' успешно выполняется

<code>
# apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
Setting up linux-image-2.6.32-5-686-bigmem (2.6.32-48squeeze6) ...
Running depmod.
Running update-initramfs.
update-initramfs: Generating /boot/initrd.img-2.6.32-5-686-bigmem
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.32-5-686-bigmem /boot/vmlinuz-2.6.32-5-686-bigmem
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 2.6.32-5-686-bigmem /boot/vmlinuz-2.6.32-5-686-bigmem
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-2.6.32-5-686-bigmem
Updating /boot/grub/menu.lst ... done
</code>

==== Ссылки ====

  * http://www.sysadmintalk.net/forums/thread-1211.html
  * http://www.adminsehow.com/2011/09/xen-pygrub-warning-grub-probe-cant-find-drive-for-devxvda1/