update-grub ignores non-xen kernels if the system is a domU

Binary package hint: grub

update-grub ignores non-xen kernels if the system is a domU and provides no mechanism to override/force otherwise. This behaviour was introduced in 0.97-22 in response to Debian bug #404536 (update-grub should put xen kernels in menu.lst when run in a domU). Unfortunately, this is not desirable if you're building images for non-xen systems on a xen instance as menu.lst will not contain any kernels and the image will not boot.

in_domU=
if [ -e /proc/xen/capabilities ] && ! grep -q "control_d" /proc/xen/capabilities; then
 in_domU=1
fi

sortedKernels=""
for kern in $(/bin/ls -1vr /boot | grep -v "dpkg-*" | grep "^vmlinuz-") ; do
 if `echo "$xenKernels" | grep -q "$kern "` || `echo "$kern" | grep -q "xen"`; then
  is_xen=1
 else
  is_xen=
 fi

 if [ ! "$in_domU" ] && [ "$is_xen" ]; then
   # skip xen kernels
          continue
        elif [ "$in_domU" ] && ! [ "$is_xen" ]; then
   # skip non-xen kernels
   continue
        fi