xe-guest-utilities 6.2.0-1120+dsf1-0ubuntu3 / usr / sbin / xe-update-guest-attrs

#!/bin/sh

# Copyright (C) 2009  Citrix Systems Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

# Script to write information about the guest to XenStore.
#
# Information collected (if --memory NOT passed in):
#   - Distribution name
#   - Distribution version (major and minor)
#   - Kernel version (uname)
#   - IP addresses (IPv4 & IPv6) for each Ethernet interface
#
# Additional information collected (if --memory IS passed in):
#   - memtotal
#   - memfree
#
# Memory stats are separated out because they change all the time
# and so we may not want to update them as frequently

LANG="C"
export LANG


XE_LINUX_DISTRIBUTION_CACHE=/var/cache/xe-linux-distribution
XS_CACHE=/var/cache/xenstore

IPADDR_RE="\([[:digit:]]\{1,3\}\.\)\{3\}[[:digit:]]\{1,3\}"
IPADDR6_RE="[[:xdigit:]:.]*"

export PATH=/usr/sbin:/usr/bin:/sbin:/bin
XENSTORE=${XENSTORE:-xenstore}

XENSTORE_UPDATED=0

# Force to use xenbus communication mode
export XS_OPEN_XENBUSONLY=yes

# parse command line opts

MEMORY_MODE=0 # do not update memory stats 
while [ $# -ge 1 ] ; do 
    if [ "$1" = "--memory" ] ; then
	MEMORY_MODE=1	# update only memory stats 
    fi
    shift
done

xenstore_write_cached() {
    key="$1" newval="$2"
    cache=$XS_CACHE/$key
    if [ -f $cache ] ; then
	# cache exists
	oldval=$(cat "$cache")
	if [ "$oldval" = "$newval" ] ; then
	    # value unchanged
	    return 0
	fi
    else
	# cache does not exist
	if [ -e $cache ] ; then 
	    # something (directory?) in its way
	    rm -rf $cache
	fi
    fi
    
    # try to write and update cache if successful
    if $XENSTORE-write "$key" "$newval" ; then
	mkdir -p $(dirname "$cache")
	echo -n "$newval" > "$cache"
	XENSTORE_UPDATED=1
	return 0
    fi
    return 1
}

# If we detect a domain change then delete our cache and force a refresh
domid=$(xenstore-read "domid")
cache=$XS_CACHE/unique-domain-id
newval=$(xenstore-read "/local/domain/${domid}/unique-domain-id")
if [ -e $cache ]; then
    oldval=$(cat "$cache")
    if [ "$oldval" != "$newval" ]; then
	# domain changed
	rm -rf $XS_CACHE
    fi
fi
mkdir -p $XS_CACHE
echo -n "$newval" > "$cache"

xenstore_rm_cached() {
    key="$1"
    cache=$XS_CACHE/$key
    if [ ! -e $cache ] ; then
	return 1
    fi
    # try to write and update cache if successful
    if $XENSTORE-rm "$key" ; then
	rm -rf "$cache"
	XENSTORE_UPDATED=1
	return 0
    fi
    return 1
}

xenstore_list_interfaces_cached() {
    topdir=$XS_CACHE/attr
    if [ -d $topdir ] ; then
	cd $topdir 
	for dir in * ; do 
	    [ -f $dir/ip ] && echo $dir
	done
    fi
}

if [ $MEMORY_MODE -eq 1 ] ; then
    # Update the memory information
    eval $(cat /proc/meminfo | \
	sed -n -e 's/MemTotal\: *\([0-9]*\)[^$]*/memtotal=\1/gp;' \
        -e 's/MemFree\: *\([0-9]*\)[^$]*/memfree=\1/gp;')
    
    xenstore_write_cached "data/meminfo_total" "${memtotal}"
    xenstore_write_cached "data/meminfo_free" "${memfree}"
fi



# e.g.
# $ ip addr show
# 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue 
#     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
#     inet 127.0.0.1/8 scope host lo
#     inet6 ::1/128 scope host 
#        valid_lft forever preferred_lft forever
# 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
#     link/ether 00:13:20:95:e8:74 brd ff:ff:ff:ff:ff:ff
#     inet 172.31.0.57/20 brd 172.31.15.255 scope global eth0
#     inet6 fe80::213:20ff:fe95:e874/64 scope link 
#        valid_lft forever preferred_lft forever
# 3: sit0: <NOARP> mtu 1480 qdisc noop 
#     link/sit 0.0.0.0 brd 0.0.0.0

#eval $(ip addr show | \
#       sed -n -e 's/^[[:digit:]]*: \([a-z0-9]*\): .*/ifs="\$ifs \1"; current="\1"; /gp;' \
#	      -e 's/^[[:space:]]\{4\}inet \('${IPADDR_RE}'\)\/.*/eval inet_\${current}="\1"; /gp;')

# e.g.
# eth0      Link encap:Ethernet  HWaddr 00:13:20:95:E8:74  
#           inet addr:172.31.0.57  Bcast:172.31.15.255  Mask:255.255.240.0
#           inet6 addr: fe80::213:20ff:fe95:e874/64 Scope:Link
#           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
#           RX packets:98001128 errors:0 dropped:0 overruns:0 frame:0
#           TX packets:87728920 errors:0 dropped:0 overruns:0 carrier:0
#           collisions:0 txqueuelen:1000 
#           RX bytes:35864034092 (33.4 GiB)  TX bytes:27544025180 (25.6 GiB)
#           Interrupt:177 
# 
# lo        Link encap:Local Loopback  
#           inet addr:127.0.0.1  Mask:255.0.0.0
#           inet6 addr: ::1/128 Scope:Host
#           UP LOOPBACK RUNNING  MTU:16436  Metric:1
#           RX packets:32928 errors:0 dropped:0 overruns:0 frame:0
#           TX packets:32928 errors:0 dropped:0 overruns:0 carrier:0
#           collisions:0 txqueuelen:0 
#           RX bytes:3604609 (3.4 MiB)  TX bytes:3604609 (3.4 MiB)

ifs=`/sbin/ifconfig | sed -n -e 's/^\([a-z0-9]\+\).*/name \1/p' \
    -e 's/.*inet addr:\('$IPADDR_RE'\) .*/ipv4 \1/p' \
    -e 's+.*inet6 addr: \('$IPADDR6_RE'\)/.*+ipv6 \1+p' | \
while read tag value; do
    case "${tag}" in
        name)
	    case "${value}" in
	        eth*)
		    if="${value}"
		    xenstore_rm_cached "attr/${if}"
                    echo "${if}"
		    ind=0;;
		*)
		    unset if;;
	    esac;;
	ipv4)
            [ -n "${if}" ] && xenstore_write_cached "attr/${if}/ip" "${value}";;
	ipv6)
            if [ -n "${if}" ]; then
		xenstore_write_cached "attr/${if}/ipv6/${ind}/addr" "${value}"
		ind=$((ind+1))
	    fi;;
    esac
done`

# remove any interfaces that have been unplugged or downed
for at in $(xenstore_list_interfaces_cached) ; do
    for if in $ifs ; do
	[ "${if}" = "${at}" ] && continue 2
    done
    xenstore_rm_cached "attr/${at}"
done

# distro
if [ -f ${XE_LINUX_DISTRIBUTION_CACHE} ] ; then
    . ${XE_LINUX_DISTRIBUTION_CACHE}
    for key in os_name os_majorver os_minorver os_uname os_distro ; do
	new=$(eval echo \${${key}})
	[ -n "${new}" ] && xenstore_write_cached "data/${key}" "${new}"
    done
fi

# whether I support ballooning or not
xenstore_write_cached "control/feature-balloon" "1"

# build time addons
xenstore_write_cached "attr/PVAddons/MajorVersion" "6"
xenstore_write_cached "attr/PVAddons/MinorVersion" "2"
xenstore_write_cached "attr/PVAddons/MicroVersion" "0" 
xenstore_write_cached "attr/PVAddons/BuildVersion" "70442"
xenstore_write_cached "attr/PVAddons/Installed" "1" 

# update xenstore if necessary
if [ $XENSTORE_UPDATED -eq 1 ] ; then
    xenstore_write_cached "data/updated" "$(date)"
fi