#!/bin/bash
#
# Copyright (c) 2017-2019 Virtuozzo International GmbH, All rights reserved.
# Define PATH manually because udev nullifies it
export PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/sbin:/usr/local/bin
LOCKNAME="vz-guest-tools-lin"
LOCKFILE="9:/var/lock/$LOCKNAME.lock"
LOCKFILE_BG="8:/var/lock/$LOCKNAME-bg.lock"
function find_util() {
local util=$1
for dir in /sbin /usr/sbin /bin /usr/bin; do
[ ! -x $dir/$util ] && continue
echo $dir/$util
return
done
# Last chance: it's in PATH
echo $util
}
PID=$$
function syslogger() {
[ ! -x $LOGGER ] && return
$LOGGER -t "VZTOOLS_udev{$PID}" $*
}
function cleanup() {
if [ $1 -eq 0 -a -x $EJECT ]; then
umount $DIR 2>&1 | syslogger
if ! findmnt $DEVNAME >/dev/null 2>&1; then
# CD is not mounted elsewhere => eject the disk
# Note: If you need to always eject the disk make sure to unmount all mount
# points first: eject unmounts only the latest one and leaves the rest
# of them mounted.
$EJECT $DEVNAME 2>&1 | syslogger
[ $? -ne 0 ] && syslogger "Failed to eject $DEVNAME"
fi
else
# For debugging
umount $DIR 2>&1 | syslogger
[ $? -ne 0 ] && syslogger "Failed to umount $DEVNAME"
fi
rm -rf $DIR > /dev/null 2>&1
restore_root_options
lock_end "$LOCKFILE"
exit $1
}
function error() {
echo $*
syslogger $*
cleanup 1
}
function lock_begin() {
local LOCK_FILE=${1##*:}
local LOCK_HDL=${1%%:*}
# Open lock file for protection from simultaneous running of several instances
if ! eval "exec $LOCK_HDL>$LOCK_FILE"; then
syslogger "Failed to open lock file '$LOCK_FILE', aborting"
exit 1
fi
# Grab the lock, if not already grabbed by another instance
if ! flock -xn $LOCK_HDL; then
syslogger "Another installer instance is running, aborting"
exit 0
fi
}
function lock_end() {
local LOCK_FILE=${1##*:}
local LOCK_HDL=${1%%:*}
rm -f "$LOCK_FILE"
flock -u $LOCK_HDL
}
function ensure_rw_root() {
# In Debian/Ubuntu udev is started when root is read-only, and it remains read-only
# within the udev namespace; installer cannot change anything.
# Check if this is the case and force remount root as read-write.
IFS=',' read -a opts < <(findmnt -o OPTIONS -n /)
for opt in "${opts[@]}"; do
if [ "$opt" == "ro" ]; then
syslogger "Root is read-only, remounting as read-write"
mount -o remount,rw /
REMOUNTED=1
break
fi
done
}
function restore_root_options() {
if [ "$REMOUNTED" == "1" ]; then
syslogger "Restoring read-only root"
sync
mount -o remount,ro /
fi
}
LOGGER=`find_util logger`
EJECT=`find_util eject`
BLKID=`find_util blkid`
TOOLS_INSTALLER="install"
LABEL="vz-tools-lin"
lock_begin "$LOCKFILE"
# Restart as background process to avoid killing by udev on timeout
if [ "x$1" == "xbackground" ]; then
lock_begin "$LOCKFILE_BG"
shift
syslogger "Restarting $0 in background"
# Free the lock
lock_end "$LOCKFILE"
if which at >/dev/null 2>&1; then
syslogger "Using 'at' for background"
echo $0 "$@" | at now
elif ps aux | grep -q '\(/usr\)\?/s\?bin/crond\?'; then
syslogger "Using cron for background, may take up to 1 minute to activate the job"
ensure_rw_root
CRONFILE=$(mktemp /etc/cron.d/install-tools-XXXX)
echo "* * * * * root rm -f $CRONFILE; $0 \"$@\"" >$CRONFILE
restore_root_options
else
# Fallback: just start in background and hope for the best
syslogger "'at' not found, cron is not running, using shell '&' for background"
$0 "$@" & >/dev/null 2>&1
fi
lock_end "$LOCKFILE_BG"
exit 0
fi
ensure_rw_root
DIR=`mktemp -d /tmp/toolsXXX`
# Check that started manually or from udev
if [ "x$DEVNAME" = "x" ]; then
DEVNAME=`$BLKID -l -o device -t LABEL=$LABEL 2>/dev/null | grep -E -m 1 ".*"`
[ "x$DEVNAME" = "x" ] && error "Can't find ISO with label $LABEL"
else
# Check that udev failed
[ "x$ID_FS_LABEL" != "x$LABEL" ] && error "Incorrect tools ISO"
fi
mount -r $DEVNAME $DIR > /dev/null 2>&1 || error "Failed to mount $DEVNAME $LABEL disk"
[ ! -x $DIR/$TOOLS_INSTALLER ] && error "Incorrect tools ISO"
$DIR/$TOOLS_INSTALLER 2>&1 | syslogger
test ${PIPESTATUS[0]} -eq 0 || error "Failed to install tools"
syslogger "Virtuozzo guest tools successfully installed"
cleanup 0
Mini