libvirt-bin 1.3.1-1ubuntu10 / usr / sbin / libvirt-migrate-xend-managed-domains

#!/bin/sh
#------------------------------------------------------------------------------
# Author: Stefan Bader <stefan.bader@canonical.com>
# Copyright 2014 Canonical Ltd.
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3,
#    as published by the Free Software Foundation.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#------------------------------------------------------------------------------

# Migrate managed guests from xend into xml format managed by libvirt.

XEND_GUEST_DIR="/var/lib/xend/domains"
if [ "$(find $XEND_GUEST_DIR -name config.sxp 2>/dev/null)" = "" ]; then
	exit 0
fi

XEN_CAPS="/proc/xen/capabilities"
if [ ! -f $XEN_CAPS ] || [ "$(cat $XEN_CAPS)" != "control_d" ]; then
	cat <<-EOD >&2
	---
	--- INFO:
	---
	Old xend managed domains detected but currently not running in
	Xen dom0. Conversion aborted. You can run the conversion later
	by calling $(basename $0)
	EOD
	exit 0
fi
if [ "$(ps ax|grep xend|grep -v migrate|grep -v grep)" != "" ]; then
	cat <<-EOD >&2
	---
	--- INFO:
	---
	The old toolstack (xend/xm) seems to be running. This toolstack is
	deprecated and will be removed in Xen-4.5. Please switch to the xl
	toolstack as soon as possible. The old xend managed domains can be
	migrated to libvirt later by calling $(basename $0)".
	EOD
	exit 0
fi
#
# Can libvirt be contacted? Found that sometimes it does not yet seem to be
# up after a restart.
#
if ! virsh -c xen:/// version >/dev/null 2>&1; then
	sleep 5
	if ! virsh -c xen:/// version >/dev/null 2>&1; then
		cat <<-EOD >&2
		---
		--- WARNING
		---
		Atempted convestion of xend managed domains could not be
		done as libvirt did not seem to start correctly.
		You can manually start the migration ilater by calling
		$(basename $0).
		EOD
		exit 0
	fi
fi

if [ -f /var/lib/libvirt/xend-migration-done ]; then
	exit 0
fi

if [ $(id -u) -ne 0 ]; then
	echo "$(basename $0) must be executed by root" >&2
	exit 1
fi

GUEST_LIST="$(virsh -c xen:/// list --all|awk 'FNR>2{print $2}')"

cat <<EOD >&2
---
--- Info:
---
Trying to migrate guests that were provided through xend managed domains
before. That conversion might not be complete. Please verify the resulting
guest definitions.

EOD

for DOM_UUID in $(ls -1 "${XEND_GUEST_DIR}"); do
	CFG_FILE="${XEND_GUEST_DIR}/${DOM_UUID}/config.sxp"
	if [ ! -f "${CFG_FILE}" ]; then
		continue
	fi
	NAME=$(awk '/name_label/{print substr($2, 1, length($2)-1)}' $CFG_FILE)
	if [ "$(echo $GUEST_LIST|grep $NAME)" != "" ]; then
		echo "Domain $NAME already defined. Skipping..."
		continue
	fi

	#
	# Replace any occurrence of device_model with "qemu-xen". This
	# is more or less convenience right now as libvirt does not use
	# that information. It probably should get mapped to
	# device_model_version and then is either qemu-xen (default) or
	# qemu-xen-traditional.
	#
	awk '
		/device_model/{
			sub(/_model.*/, "_model qemu-xen)")
		}
		{
			print
		}' $CFG_FILE >/tmp/$NAME.sxpr

	virsh -c xen:/// domxml-from-native xen-sxpr /tmp/$NAME.sxpr |
	#
	# Not sure how those lines get generated, but any specific
	# vif#.# as a target device cannot be right.
	#
	# The other problem is file based virtual disks. The conversion
	# creates a driver name line that does prove fatal as it causes
	# libxl to try blktap.
	#
	awk '
		/target dev=.vif/{
			next
		}
		/driver name=.file./{
			next
		}
		{
			print
		}
	' >/tmp/$NAME.xml
	virsh -c xen:/// define /tmp/$NAME.xml
	rm /tmp/$NAME.xml /tmp/$NAME.sxpr
done >&2

touch /var/lib/libvirt/xend-migration-done


exit 0