Re: [Xen-devel] /etc/grub.d/09-xen for generating grub.cfg for hypervisor boot entries.

[Bruce Edge <bruce.edge@xxxxxxxxx>]

OK, here's the minor mod to only do this for Xen kernels as determined by DOM0=y in boot/config-*

Added header and switched from sh to bash to get param subst functionality because I'm too lazy to think about other options.

========================================= cut ================================

#!/bin/bash -e

#===============================================================================

#

#          FILE:  09_xen

# 

#         USAGE:  update-grub ... with this in /etc/grub.d

# 

#   DESCRIPTION: Generate grub2 boot stanza for Xen systems

#                               Xen boot entries are automatically added to grub.cfg

#                               The 09-... name prefix puts the Xen boot entries before 

#                               the linux kernel entries

# 

#       OPTIONS:  ---

#  REQUIREMENTS:  --- grub2, Xen hypervisor

#          BUGS:  --- probably

#         NOTES:  --- Copied from 10_linux with a few hacks to make ir work for Xen.

#                                       Incorporated suggestions to only do this for valid dom0 kernels

#        AUTHOR:  Bruce Edge (BRE), bruce.edge@xxxxxxx 

#       COMPANY:  LSI

#       VERSION:  1.0

#       CREATED:  05/19/2010 02:32:34 PM PDT

#      REVISION:  ---

#===============================================================================

prefix=/usr

exec_prefix=${prefix}

libdir=${exec_prefix}/lib

. ${libdir}/grub/update-grub_lib

if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then

  OS=GNU/Linux

else

  OS="${GRUB_DISTRIBUTOR}"

fi

# Source grub defaults

. /etc/default/grub

# loop-AES arranges things so that /dev/loop/X can be our root device, but

# the initrds that Linux uses don't like that.

case ${GRUB_DEVICE} in

  /dev/loop/*|/dev/loop[0-9])

    GRUB_DEVICE=`losetup ${GRUB_DEVICE} | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`

  ;;

esac

if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \

    || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" ; then

  LINUX_ROOT_DEVICE=${GRUB_DEVICE}

else

  LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}

fi

test_gt ()

{

  local a=`echo $1 | sed -e "s,.*/vmlinu[zx]-,,g;s/[._-]\(pre\|rc\|test\|git\|old\)/~\1/g"`

  local b=`echo $2 | sed -e "s,.*/vmlinu[zx]-,,g;s/[._-]\(pre\|rc\|test\|git\|old\)/~\1/g"`

  if [ "x$b" = "x" ] ; then

    return 0

  fi

  dpkg --compare-versions "$a" gt "$b"

  return $?

}

find_latest ()

{

  local a=""

  for i in $@ ; do

    if test_gt "$i" "$a" ; then

      a="$i"

    fi

  done

  echo "$a"

}

list=`for i in /boot/vmlinu[xz]-* /vmlinu[xz]-* ; do

        if grub_file_is_not_garbage "$i" && grep -q 'DOM0=y' ${i/vmlinu[xz]/config} ; then echo -n "$i " ; fi

      done`

while [ "x$list" != "x" ] ; do

  linux=`find_latest $list`

  echo "Found linux image: $linux" >&2

  basename=`basename $linux`

  dirname=`dirname $linux`

  rel_dirname=`make_system_path_relative_to_its_root $dirname`

  version=`echo $basename | sed -e "s,^[^0-9]*-,,g"`

  alt_version=`echo $version | sed -e "s,\.old$,,g"`

  linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"

  initrd=

  for i in "initrd.img-${version}" "initrd-${version}.img" \

           "initrd.img-${alt_version}" "initrd-${alt_version}.img"; do

    if test -e "${dirname}/${i}" ; then

      initrd="$i"

      break

    fi

  done

  if test -n "${initrd}" ; then

    echo "Found initrd image: ${dirname}/${initrd}" >&2

  else

    # "UUID=" magic is parsed by initrds.  Since there's no initrd, it can't work here.

    linux_root_device_thisversion=${GRUB_DEVICE}

  fi

  cat << EOF

  insmod lvm

  set root=(system-dom0_0)

menuentry "Xen ${OS}, linux ${version}" {

        multiboot dummy=dummy /boot/xen.gz $GRUB_CMDLINE_XEN_DEFAULT

        module ${rel_dirname}/${basename} root=${linux_root_device_thisversion} $GRUB_CMDLINE_LINUX_DEFAULT

EOF

  if test -n "${initrd}" ; then

    cat << EOF

        module ${rel_dirname}/${initrd} ${rel_dirname}/${initrd}

EOF

  fi

  cat << EOF

}

EOF

  list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr '\n' ' '`

done

========================================= cut ================================

-Bruce

On Wed, May 19, 2010 at 1:19 PM, Richie <listmail@xxxxxxxxxxxx> wrote:

Ok.  Thanks for correcting my mistake.

Jeremy Fitzhardinge wrote:

On 05/19/2010 10:47 AM, listmail wrote:
 

Yes that should do it and no corresponding boot/config-$(uname -r)
means nothing will be generated for the respective kernel.  There
could also be a check for CONFIG_XEN=y to support Xenlinux kernels. That entry should not exist in pvops .config    

Yes, it does.  CONFIG_XEN is the master switch for all Xen-related
features in a pvops kernel.  You would have to look for the absence of
CONFIG_PARAVIRT to detect a Xenlinux kernel.

   J

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