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Re: update-grub & Xen boot stanza generation
From: |
Vladimir 'φ-coder/phcoder' Serbinenko |
Subject: |
Re: update-grub & Xen boot stanza generation |
Date: |
Fri, 21 May 2010 01:53:25 +0200 |
User-agent: |
Mozilla-Thunderbird 2.0.0.22 (X11/20091109) |
Bruce Edge wrote:
> 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.
>
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.
> 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), address@hidden
> <mailto:address@hidden>
> # 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
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Grub-devel mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/grub-devel
>
--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko
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Re: update-grub & Xen boot stanza generation,
Vladimir 'φ-coder/phcoder' Serbinenko <=