There's a bug in certain hypervisor versions where it drops the first
parameter. This is the accepted workaround, pass a dummy param as the first
entry.
-Bruce
On Thu, May 20, 2010 at 4:45 PM, Seth Goldberg <seth.goldb...@oracle.com>wrote:
>
> What is this 'dummy=dummy' on the multiboot line?
>
> --S
>
>
> Quoting Bruce Edge, who wrote the following on Thu, 20 May 2010:
>
> Hi
>> Apologies in advance if this is already in the works.
>>
>> I wanted to provide an etc/grub.d rule for generating boot stanzas for Xen
>> based systems such that it would end up in the upstream grub release.
>> If this conforms to the appropriate conventions, could someone possibly
>> add
>> it ?
>>
>> It's basically a copy of etc/grub.d/10_linux and adds checks for dom0
>> capable kernels. I picked "09_" as I assumed that one would want to
>> default
>> to the Xen boot entry, but that may be a matter of some debate.
>>
>> Thanks
>>
>> -Bruce
>>
>>
>> #!/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.e...@lsi.com
>> # 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
>>
>>
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