#!/bin/ksh
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
#(C)IBM Corp
################################################################
# Usage:
#		xcatchroot -h 
#		xcatchroot [-v] -i osimage  cmd_string
#
#
# WARNING:
#			Be very careful when using this script!!!  Make sure you are 
#			very clear about exactly what you are changing and what effect
#			it will have.
#
#			As a precaution it is advisable to make a copy of the original 
#			spot in case your changes wind up corrupting the image.
#
# Note:
#        	There is a fix for the AIX bosboot command that is needed for
#			this script to work properly if your command involves modifying
#			the ODM.  The AIX APAR information is not available at this time.
#
#			However, it is very easy to check for and/or make the required
#			modification.
#
#			In the bosboot code, there is a check for the creation of a boot
#			image; if the image creation is anything other than disk, the 
#			odm values are not picked up. You will have to confirm that
#			the bosboot command in your spot has the check removed.
#
#           Edit the bosboot command contained in the spot (save a backup). 
#			(ex. "vi <path_to_spotName>/usr/sbin/bosboot"). Search for
#			"zap it as". The next line checks to see if the
#			device prefix is "hdisk".  Comment out the line and the
#			corresponding "fi" which ends the "if" statement.  Now this
#			code will always execute. Save changes.
#
# Note:  	Always run the NIM check operation after you are done updating 
#			your spot.
#
#        		nim -Fo check spotName
#
######################################################################

# make sure we only run on AIX for now
OSNAME=$(uname -s)
if [[ $OSNAME != "AIX" ]] ; then
	echo "This command is currently only supported on AIX."
	exit 0
fi

# include common NIM shell defines/functions
NIM="/usr/sbin/nim"
NIMPATH=/usr/lpp/bos.sysmgt/nim
NIM_METHODS="${NIMPATH}/methods"
. ${NIM_METHODS}/c_sh_lib
M_CHATTR="${NIM_METHODS}/m_chattr"

#---------------------------- local defines     --------------------------------
server=""
spot=""
lpp_source=""
spotObj=""
lppObj=""

#---------------------------- module globals    --------------------------------
REQUIRED_ATTRS=""
OPTIONAL_ATTRS=""
location=""
osimage=""
cmd_string=""
verbose=0

usage="Usage:\n\txcatchroot -h\n\txcatchroot [-V] -i osimage  cmd_string"

# signal processing
trap cleanup 0
trap err_signal 1 2 11 15

# NIM initialization
nim_init

# initialize local variables
typeset z=""

# set parameters from command line
while getopts :i:vVh z
do
	case ${z} in

		h)			echo $usage
					exit 0 
					;;

		i)			# xCAT osimage name
					osimage=${OPTARG}
					;;

		v)          # NIM verbose mode (undocumented option for debugging)
                    set -x
                    for i in $(typeset +f)
                    do
                        typeset -ft $i
                    done
                    ;;

		V)			# xCAT verbose
					verbose=1
					;;

		\?)			# unknown option
					echo "Unknown options."
					echo $usage
					exit 1
					;;
	esac
done

shift `expr $OPTIND - 1`
cmd_string=$1

# check for cmd string
if [[ $cmd_string = "" ]] ; then
	echo "ERROR: A command strng is required."
	echo "xcatchroot: ERROR: A command strng is required." | logger -t xcat
	echo $usage
	exit 1
fi

# chk for osimage ??
if [[ $osimage = "" ]] ; then
	echo "ERROR: An xCAT osimage name is required."
	echo "xcatchroot: ERROR: An xCAT osimage name is required." | logger -t xcat
	echo $usage
	exit 1
fi

# get the spot and lpp_source name from the osimage def
if [ $verbose -eq 1 ]
then
	echo "Running command: '/opt/xcat/bin/lsdef -t osimage -o $osimage -i spot | grep spot | cut -f2 -d ='\n"
fi

spot=`/opt/xcat/bin/lsdef -t osimage -o $osimage -i spot | grep spot | cut -f2 -d = `

if [[ $spot = "" ]] ; then
	echo "ERROR: Could not get spot name from xCAT osimage definition."
	echo "xcatchroot: ERROR: Could not get spot name from xCAT osimage definition." | logger -t xcat
	exit 1
fi

if [ $verbose -eq 1 ]
then
    echo "Running command: '/opt/xcat/bin/lsdef -t osimage -o $osimage -i lpp_source | grep lpp_source | cut -f2 -d ='\n"
fi
lpp_source=`/opt/xcat/bin/lsdef -t osimage -o $osimage -i lpp_source | grep lpp_source | cut -f2 -d = `

# confirm & set spot path for chroot global vars
if ${LSNIM} $spot >/dev/null ; then

	if [[ $verbose -eq 1 ]]; then
    	echo "Running command: ${LSNIM} -a server $spot | ${AWK} '/server/ {print $3}'\n"
	fi
	server=`${LSNIM} -a server $spot | ${AWK} '/server/ {print $3}'`

	if [[ $server = "master" ]] ; then

		spotObj="$spot"
		# chroot uses location var
		if [ $verbose -eq 1 ]
		then
			echo "Running command: ${LSNIM} -a location $spotObj | ${AWK} '/location/ {print $3}'\n"
		fi
		location=`${LSNIM} -a location $spotObj | ${AWK} '/location/ {print $3}'` 

	else
		echo "ERROR: Cannot use chroot with remote resources $spot." 
		echo "xcatchroot: ERROR: Cannot use chroot with remote resources $spot." | logger -t xcat
		exit 1
	fi
fi

# confirm & set lpp_source path for chroot global vars
if ${LSNIM} $lpp_source >/dev/null ; then

	if [ $verbose -eq 1 ]
	then
		echo "Running command: ${LSNIM} -a server $lpp_source | ${AWK} '/server/ {print $3}'\n"
	fi
	server=`${LSNIM} -a server $lpp_source | ${AWK} '/server/ {print $3}'`

	if [[ $server = "master" ]] ; then

		lppObj="$lpp_source"
		# chroot uses lpp_source var
		if [ $verbose -eq 1 ]
		then
			echo "Running command: ${LSNIM} -a location $lppObj | ${AWK} '/location/ {print $3}'\n"
		fi

		lpp_source=`${LSNIM} -a location $lppObj | ${AWK} '/location/ {print $3}'`
	else
		echo "ERROR: Cannot use chroot with remote resource $lpp_source."
        echo "xcatchroot: ERROR: Cannot use chroot with remote resource $lpp_source." | logger -t xcat
        exit 1
	fi
fi

# last sanity check before chroot session is attempted
if [[ ! -d $location ]] ; then
	echo "ERROR: Unable to proceed. Check resource name(s) also verify path location(s)."
	echo "xcatchroot: ERROR: Unable to proceed. Check resource name(s) also verify path location(s)." | logger -t xcat
	exit 1
else

	# create a temporary script containing the $cmd_string
    # put it in the spot location
	if [ $verbose -eq 1 ]
	then
		echo "Running command: echo '#!/bin/ksh\n$cmd_string' > $location/xcatchrootscript\n"
	fi

    `echo "#!/bin/ksh\n$cmd_string" > $location/xcatchrootscript`
	`chmod 777 $location/xcatchrootscript`

	# setup chroot environment
	setup_chroot_env
	${SET_CHROOT_LIBPATH}
	
	# mount the lpp_source
	if [[ -d $lpp_source ]] ; then
		if [ $verbose -eq 1 ]
		then
			echo "Running command: 'mount ${lpp_source} ${new_root}/lpp_source'\n"
		fi
		nim_mount ${lpp_source} ${new_root}/lpp_source
	fi

	# add session id to spot comment field
	# on a graceful exit, we'll update this to show completion timestamp
	if tty -s
	then
		$NIM -o change -a comments="chroot session $$ is enabled on `tty`" $spotObj
	fi
	
	# sensitive process : place "unavailable" state on spot & lpp_source
	${M_CHATTR} -a Rstate=unavailable $spotObj
	if [[ -d $lpp_source ]] ; then
		${M_CHATTR} -a Rstate=unavailable $lppObj
	fi

	# run the temp script using chroot
	if [ $verbose -eq 1 ]
    then
		echo "Running command: ${chroot} /usr/xcatchrootscript\n"
	fi
	${chroot} /usr/xcatchrootscript

	# sensitive process has completed
	${M_CHATTR} -a Rstate=available $spotObj
	if [[ -d $lpp_source ]] ; then
		${M_CHATTR} -a Rstate=available $lppObj
	fi

	# update spot comment field
	$NIM -o change -a comments="chroot session $$ has ended" $spotObj

fi

# remove the tmp script
if [ $verbose -eq 1 ]
then
	echo "Running command: 'rm $location/xcatchrootscript'\n"
fi
`rm $location/xcatchrootscript`

# echo "\nNote: Be sure to perform the NIM check operation after completing NIM spot\nupdates. (ex. 'nim -o check <spot_name>')"

# all done
exit 0
