Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

executable file 248 lines (215 sloc) 6.248 kb
#!/bin/bash
#
# Copyright (c) Citrix Systems 2008. All rights reserved.
#
# Script which lets you edit the grub.conf in a Linux guest virtual disk.
if [ ! -e @INVENTORY@ ]; then
echo Must run on a XenServer host.
exit 1
fi
. @INVENTORY@
XE="@BINDIR@/xe"
device_number=
grub_conf=
default_file_list="/boot/grub/menu.lst /grub/menu.lst /boot/grub/grub.cfg /grub/grub.cfg"
function usage {
echo "Usage: $0 [-u <VM UUID>] [-n <VM name>]"
echo " [-p <partition number>] [-f <filename>]"
echo
echo " -u: UUID of the VM boot disk you wish to edit"
echo " -n: Name label of the VM boot disk you wish to edit"
echo " -p: Partition number to mount (default: none)"
echo " -f: Location of bootloader config file to edit"
echo " (defaults: ${default_file_list})"
echo
echo "Either -u or -n must be supplied to specify the VM to edit"
echo "Set the EDITOR environment variable if desired (default: nano)"
exit 1
}
while getopts "hu:n:p:f:" opt ; do
case $opt in
h) usage ;;
u) vm_uuid=${OPTARG} ;;
n) vm_name="${OPTARG}" ;;
p) device_number=${OPTARG} ;;
f) default_file_list="${OPTARG}" ;;
*) echo "Invalid option"; usage ;;
esac
done
# determine a VM UUID
IFS=,
if [ "${vm_name}" != "" ]; then
vm_uuids=$(${XE} vm-list name-label="${vm_name}" params=uuid --minimal)
num_vm_uuids=0
for vm in ${vm_uuids}; do
num_vm_uuids=$(( ${num_vm_uuids} + 1 ))
done
if [ ${num_vm_uuids} -eq 0 ]; then
echo Unable to find VMs matching name-label: ${vm_name}
exit 1
elif [ ${num_vm_uuids} -gt 1 ]; then
echo Found multiple VMs with name-label: ${vm_name}
echo ${vm_uuids}
echo Please specify one of the UUIDs using the -u option
exit 1
fi
vm_uuid=${vm_uuids}
fi
# verify that the VM UUID is valid
if [ "${vm_uuid}" = "" ]; then usage; fi
checkuuid=$(${XE} vm-list uuid="${vm_uuid}" params=uuid --minimal)
if [ "${checkuuid}" = "" ]; then
echo Specified VM UUID "${vm_uuid}" does not exist.
exit 1
fi
# select nano as the default editor
if [ "${EDITOR}" = "" ]; then
EDITOR=nano
fi
mnt=
function cleanup {
if [ ! -z "${mnt}" ]; then
umount ${mnt} >/dev/null 2>&1
rmdir ${mnt}
fi
if [ ! -z "${vbd_uuid}" ]; then
echo -n "Unplugging VBD: "
${XE} vbd-unplug uuid=${vbd_uuid} timeout=20
# poll for the device to go away if we know its name
if [ "${device}" != "" ]; then
device_gone=0
for ((i=0; i<10; i++)); do
echo -n "."
if [ ! -b ${device} ]; then
echo " done"
device_gone=1
break
fi
sleep 1
done
if [ ${device_gone} -eq 0 ]; then
echo " failed"
echo Please destroy VBD ${vbd_uuid} manually.
else
${XE} vbd-destroy uuid=${vbd_uuid}
fi
fi
fi
}
# Find the bootable VBD for the VM
IFS=","
bootable_vbds=$(${XE} vbd-list vm-uuid=${vm_uuid} bootable=true params=uuid --minimal)
num_bootable_vbds=0
for vbd in ${bootable_vbds}; do
num_bootable_vbds=$(( ${num_bootable_vbds} + 1 ))
done
if [ ${num_bootable_vbds} -eq 0 ]; then
echo Unable to find a bootable disk for VM.
echo There are no VBDs marked with bootable=true.
exit 1
elif [ ${num_bootable_vbds} -gt 1 ]; then
echo Found ${num_bootable_vbds} for VM, but only 1 is allowed.
echo Please remove the bootable=true flag from some VBDs to fix this.
exit 1
fi
# we now know that there is only one bootable VBD, so use that
vbd_uuid=${bootable_vbds}
vdi_uuid=$(${XE} vbd-param-get uuid=${vbd_uuid} param-name=vdi-uuid)
if [ "${vdi_uuid}" = "" ]; then
echo Unable to determine VDI associated with VBD ${vbd_uuid}
exit 1
fi
# check that the VDI is not currently in use
vbd_uuids=$(${XE} vbd-list vdi-uuid=${vdi_uuid} params=uuid --minimal)
if [ $? -ne 0 ]; then
echo Error in vbd-list call
exit 1
fi
for vbd in ${vbd_uuids}; do
attached=$(${XE} vbd-list params=currently-attached uuid=${vbd} --minimal)
case ${attached} in
true)
vm_uuid=$(${XE} vbd-list params=vm-uuid uuid=${vbd} --minimal)
echo The VDI is currently in use by VBD:
echo ${vbd}
echo The associated VM is:
echo ${vm_uuid}
echo
${XE} vm-list uuid=${vm_uuid}
echo Please shut down any running VMs which are currently using the disk.
exit 1
;;
false)
;;
*)
echo Internal error: unknown currently-attached result: ${attached}
;;
esac
done
echo -n "Creating dom0 VBD: "
vbd_uuid=$(${XE} vbd-create vm-uuid=${CONTROL_DOMAIN_UUID} vdi-uuid=${vdi_uuid} device=autodetect)
echo ${vbd_uuid}
if [ $? -ne 0 -o -z "${vbd_uuid}" ]; then
echo error creating VBD for dom0 block attach
cleanup
exit 1
fi
echo -n "Plugging VBD: "
${XE} vbd-plug uuid=${vbd_uuid}
echo ${device}
device=/dev/$(${XE} vbd-param-get uuid=${vbd_uuid} param-name=device)
if [ ! -b ${device} ]; then
echo ${device}: not a block special
cleanup
exit 1
fi
echo -n "Waiting for ${device}${device_number}: "
found_device=0
for ((i=0; i<5; i++)); do
echo -n '.'
if [ -b ${device}${device_number} ]; then
found_device=1
echo ' done'
break
fi
sleep 1
done
if [ ${found_device} -eq 0 ]; then
echo Device ${device}${device_number} not found.
echo You must specify the correct partition number with -p
cleanup
exit 1
fi
echo -n "Mounting filesystem: "
mnt=/var/run/fix-grub-${vdi_uuid}
mkdir -p ${mnt}
mount ${device}${device_number} ${mnt} > /dev/null 2>&1
if [ $? -ne 0 ]; then
echo " failed"
echo Partitions in the VDI are:
echo
ls -la ${device}*
echo
echo You can use the -p option to specify a partition number to mount.
cleanup
exit 1
fi
echo " done"
IFS=" "
if [ "${grub_conf}" = "" ]; then
for f in ${default_file_list}; do
if [ -e "${mnt}${f}" ]; then
grub_conf="${f}"
break;
fi
done
fi
if [ "${grub_conf}" = "" ]; then
echo Unable to find a valid bootloader config file in:
echo " ${default_file_list}"
echo Please specify one with the -f option
cleanup
exit 1
fi
${EDITOR} ${mnt}${grub_conf}
cleanup
Jump to Line
Something went wrong with that request. Please try again.