-Bruce
On Mon, May 24, 2010 at 9:45 AM, Isaac Dupree <
m...@isaac.cedarswampstudios.org> wrote:
> On 05/24/10 00:48, Joey Korkames wrote:
>
>> This is aready worked on but the problem is that it generates too much
>>>> entries. If you have 5 different versions of hypervisor and 10
>>>> different
>>>> kernels you have 100 entries.
>>>>
>>>>
>>>> What if I add a max_entries option. Say, don't generate more than 4
>>>> stanzas total. Although I suppose then I need to go through and pick
>>>> the most recent kernel and hypervisor versions.
>>>>
>>>> It feels like a kludgy solution
>>>
>>
> It seems like the non-kludgy setup (while avoiding quadratic menu sizes)
> would be one in which, in one menu you pick which Xen hypervisor, and in the
> next menu you pick which Xen kernel. Is that feasible to implement? useful?
>
> -Isaac
>
>
The script below contains the fixes mentioned in the thread so far.
It only generates menu entries using the one xen.gz hypervisor to eliminate
the geometric entry number problem. The most recently installed hypervisor
overwrites this symlink with one pointing to itself. The result is that you
will only have entries for one hypervisor * the number of dom0 capable
kernels.
I made one more change such that if GRUB_CMDLINE_XEN_DEFAULT is not in
/etc/default/grub, then it will ignore xen completely and not generate any
additional boot entries. This should make it undetectable by anyone not
explicitly wanting Xen boot entries.
Feel free to strip the header, reformat, whatever.
-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`
grub -q GRUB_CMDLINE_XEN_DEFAULT || list=""
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 /boot/xen.gz dummy=dummy $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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