#!/bin/ksh
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html

################################################################################
#
#	aixlitesetup
#		- This script is used to configure the xCAT statelite support 
#			for AIX
#
###############################################################################

SL="/.statelite"
ROOTDIR="/"  
MOUNTDIR="$SL/mnt"   # where I mount all the trees.
PERSISTENT="$SL/persistent"
TMPDIR="$SL/tmpdir"
DEFAULT="/.default"

# statelite table files are in "/"
# /statelite.table, /litefile.table, /litetree.table
STATELITE="/statelite.table"
LITEFILE="/litefile.table"
LITETREE="/litetree.table"
LOG="${ROOTDIR}/${SL}/statelite.log"

ELIST=[]    # entry list, each entry will contain the type and the path

# get this node name from the /etc/niminfo file
INFO=`/usr/bin/cat /etc/niminfo | grep 'NIM_HOSTNAME'`
ME=`echo $INFO | /usr/bin/awk -F= '{print $2}' | /usr/bin/awk -F. '{print $1}'`

if [ ! -s ${STATELITE} ]; then
	echo "no ${STATELITE} file"
	echo "no ${STATELITE} file"  >>$LOG
	exit 0
fi
if [ ! -s ${LITEFILE} ]; then
	echo "no ${LITEFILE} file"
	echo "no ${LITEFILE} file"  >>$LOG
	exit 0
fi

# check the statelite.table file to see if we have
#       a persistent dir to mount.
ProcessStatelite () {

	for i in `/usr/bin/cat $STATELITE | /usr/bin/grep -v '^#' | /usr/bin/grep $ME`
	do

		SERVER=`echo $i | /usr/bin/awk -F'|' '{print $2}'`
		TOMNT=`echo $i | /usr/bin/awk -F'|' '{print $3}'`

		# /.statelite/tmpdir
		if [ ! -d ${TMPDIR} ]; then
			mkdir -m 755 -p ${TMPDIR}
		fi

		# /.statelite/persistent
		if [ ! -d ${PERSISTENT} ]; then
			mkdir -m 755 -p ${PERSISTENT}
		fi

		# mount 10.2.0.200:/nodedata /.statelite/persistent
		/usr/sbin/mount $SERVER:$TOMNT ${PERSISTENT}

		# make a node subdir
		# /.statelite/persistent/<nodename>
		if [ ! -d ${PERSISTENT}/${ME} ]; then
			mkdir -m 755 -p ${PERSISTENT}/${ME}
		fi

	done
}

# process the litefile table
ProcessLitefile () {
	let j=0
	for i in `/usr/bin/cat $LITEFILE | /usr/bin/grep $ME`
	do
		type=`echo $i | /usr/bin/awk -F'|' '{print $2}'`
		path=`echo $i | /usr/bin/awk -F'|' '{print $3}'`

		# entry list one line per element
		ELIST[$j]="$type $path";
		let j=j+1;

	done

	# number of entries(lines) in file
	num=${#ELIST[@]}

	let i=0
	while [ $i -lt $num ]; do

      	set -- ${ELIST[$i]}
       	etype=$1
       	epath=$2

		# ex. for /etc/foo the parent is /etc/
		parent="`/usr/bin/dirname $epath`/"

		let efound=0
		let ptype=0
		let ppath=0
		while [ "$parent" != "//" ]; do
			let j=0
			while [ $j -lt $num ]; do
				set -- ${ELIST[$j]}
				jtype=$1
				jpath=$2

				# see if a parent is also one of the file entries
				if [ "$parent" = "$jpath" ]; then
					efound=1
					ptype=$jtype
					ppath=$jpath
					break 2
				fi
				let j=j+1;
			done
			parent="`/usr/bin/dirname $parent`/"
		done

		if [ "$efound" = "1" ]; then
			# found a parent & child on the list

			# check options
			# can't do any child that has parent of ro
			if [ "$ptype" = "ro" ]; then
				echo "Cannot add child ($epath) when parent ($ppath) has 'ro' option." >>$LOG
				break
			fi

			# a persistent parent can't have a ro child
			if [ "$ptype" = "persistent" ]; then
				if [ "$etype" = "ro" ]; then
					echo "Cannot add child ($epath) with 'ro' option when parent ($ppath) has 'persistent' option." >>$LOG
					break
				fi
			fi

			# ok - # put the child on into CLIST
			cnum=${#CLIST[@]}
			CLIST[$cnum]=${ELIST[$i]}

		else
			# add the parents and the entries with no parents to PLIST
			let pfound=0
			let pnum=${#PLIST[@]}
			let k=0
			while [ $k -lt $pnum ]; do			
				if [ "${PLIST[$k]}" = "${path}" ]; then
                    pfound=1
                fi
				let k=k+1
			done

			if [ "$pfound" = "0" ]; then
                # put it into PLIST
				let plnum=${#PLIST[@]}
                PLIST[$plnum]=${ELIST[$i]}
            fi
		fi

		let i=i+1;	
	done

	plistnum=${#PLIST[@]}
	n=0
	while [ $n -lt $plistnum ]; do
		set -- ${PLIST[$n]}
		FindFile ${2} ${1} 0	
		let n=n+1
	done

    plistnum=${#CLIST[@]}
	m=0
    while [ $m -lt $plistnum ]; do
        set -- ${CLIST[$m]}
        FindFile ${2} ${1} 1
		let m=m+1
    done
}

# mount the required directories from the server
MountTrees () {
	# ex. /.statelite/mnt
	if [ ! -d ${MOUNTDIR} ]; then
		/usr/bin/mkdir -m 755 -p $MOUNTDIR
	fi

	for i in `/usr/bin/cat $LITETREE | /usr/bin/grep -v '^#' | /usr/bin/grep $ME`
	do

		NODE=`echo $i | /usr/bin/awk -F'|' '{print $1}'`
		SERV=`echo $i | /usr/bin/awk -F'|' '{print $2}'`
		DIR=`echo $i | /usr/bin/awk -F'|' '{print $3}'`

		if [ ! -d ${MOUNTDIR}/${SERV}${DIR} ]; then
			# ex. /.statelite/mnt/10.2.0.200/etc/
			/usr/bin/mkdir -m 755 -p ${MOUNTDIR}/${SERV}${DIR}
		fi

		MAX=5
        TRIES=1

		# ex. 10.2.0.200:/etc/ /.statelite/mnt/10.2.0.200/etc/
        while ! /usr/sbin/mount $SERV:$DIR ${MOUNTDIR}/${SERV}${DIR} 
        do
            if [ "$TRIES" = "$MAX" ]
            then
                echo "Cannot mount $i." >/dev/console
                break
            fi
            TRIES=`expr $TRIES + 1`
            S=`expr $RANDOM % 20`
            echo "Can't mount $SERV:$MNT... Sleeping $S seconds then trying again" >>$LOG
            sleep $S
        done
	done
}

#  mount the files or directories as requested
ProcessType () {

	MOUNT=$1  	#  where this is (ex. /.statelite/mnt/10.2.0.200/etc/FScfg)
	PATH=$2	  	# file (ex. /etc/FScfg)
	TYPE=$3		# type of file (ex. rw)
    isChild=$4     # child = 1, parent = 0

    PPATH=`/usr/bin/dirname ${2}` # ex. /etc
	
	case "${3}" in 
		rw)
			# item is mounted from litetree dir or .default location ($1)
			#	onto local file

			# the local name of the file or directory
			LOCAL=`echo ${2} |  /usr/bin/sed -e 's/\/$//'`

            if [ -d ${1} ]; then
				# if it's a dir 
				if [ ! -e ${LOCAL} ]; then
					/usr/bin/mkdir -m 755 -p ${LOCAL}
				fi
            else
				# if file 
				if [ ! -e ${LOCAL} ]; then
					FDIR=`/usr/bin/dirname ${2}`
                    /usr/bin/mkdir -m 755 -p ${FDIR}
                    /usr/bin/touch ${LOCAL}
				fi
            fi

			# ex. /.statelite/mnt/<server>/etc/lppcfg
 			SOURCE=`echo ${1} |  /usr/bin/sed -e 's/\/$//'`

			# make sure we don't get duplicate mounts
			/usr/sbin/umount ${LOCAL}>>$LOG > /dev/null > /dev/null 2>&1

			echo "/usr/sbin/mount ${SOURCE} ${LOCAL}" >>$LOG
			/usr/sbin/mount ${SOURCE} ${LOCAL}>>$LOG 2>&1
			;;

        persistent)
			# the item is copied to the /.statelite/persistent subdir
			#  from wherever it is found ( $1 above )
			#	the /.statelite/persistent/blah is then mounted 
			#	over the local /blah
			# ex. /.statelite/persistent/compute02/etc
            if [ ! -d ${PERSISTENT}/${ME}${PPATH} ]; then
                /usr/bin/mkdir -m 755 -p ${PERSISTENT}/${ME}${PPATH}
                echo "mkdir -p ${PERSISTENT}/${ME}${PPATH}" >>$LOG
            fi

            # if the file doesn't exist, then copy it over to persistent
            if [ ! -e ${PERSISTENT}/${ME}${2} ]; then
                echo "cp -p -r ${1} ${PERSISTENT}/${ME}${2}" >>$LOG
                /usr/bin/cp -p -r ${1} ${PERSISTENT}/${ME}${2} 2>&1 >>$LOG
            fi

            LOCAL=`echo ${2} |  /usr/bin/sed -e 's/\/$//'`
            SOURCE=`echo ${PERSISTENT}/${ME}${2}`

			if [ ! -e ${LOCAL} ]; then

                if [ -d ${SOURCE} ]; then
                    # need to create local dir
                    echo "mkdir -m 755 -p ${LOCAL}" >>$LOG
                    /usr/bin/mkdir -m 755 -p ${LOCAL}

                else
                    # need to create local file
					FDIR=`/usr/bin/dirname ${2}`
					if [ ! -d ${FDIR} ]; then
                    	/usr/bin/mkdir -m 755 -p ${FDIR}
					fi
                    /usr/bin/touch ${LOCAL}

                fi
            fi
	
			# ex. mount  /.statelite/persistent/<nodename>/blah /blah
			# note: the dir from the statelite table is mounted over
			#	/.statelite/persistent

			# make sure we don't get duplicate mounts
			/usr/sbin/umount ${LOCAL}>>$LOG > /dev/null 2>&1

            echo "/usr/sbin/mount ${SOURCE} ${LOCAL}" >>$LOG
            /usr/sbin/mount ${SOURCE} ${LOCAL}>>$LOG 2>&1
            ;;

		ro)
			# mounted file or dir is overmounted over local version
			# $1 - mounted file or directory or default(?)
			# $2 - file or dir name

			# ex. /etc/lppcfg
			LOCAL=`echo ${2} |  /usr/bin/sed -e 's/\/$//'`

			# ex. /.statelite/mnt/<server>/etc/lppcfg
			SOURCE=`echo ${1} |  /usr/bin/sed -e 's/\/$//'`

			if [ ! -e ${LOCAL} ]; then

				if [ -d ${SOURCE} ]; then
					# need to create local dir
					echo "mkdir  -m 755 -p ${LOCAL}" >>$LOG
            		/usr/bin/mkdir -m 755 -p ${LOCAL}
				else			
					# need to create local file
					GDIR=`/usr/bin/dirname ${2}`
                    if [ ! -d ${GDIR} ]; then
                        /usr/bin/mkdir -m 755 -p ${GDIR}
                    fi
					/usr/bin/touch ${LOCAL}
				fi
			fi
			# make sure we don't get duplicate mounts
			/usr/sbin/umount ${LOCAL}>>$LOG > /dev/null 2>&1

			echo "/usr/sbin/mount -o ro ${SOURCE} ${LOCAL}" >>$LOG 2>&1
			# ex. mount -o ro /.statelite/mnt/<server>/etc/lppcfg /etc/lppcfg
			/usr/sbin/mount -o ro ${SOURCE} ${LOCAL}>>$LOG 2>&1
			;;
		*)
			;;
	esac
}

# find a source for the file or directory
FindFile () {
	# $1 = Pathname to locate
	# $2 = Type of file
    # $3 = 0 or 1: 0 means parent, 1 means child
	path=$1
	type=$2
    isChild=$3
	FOUND=0

	# this assumes the dir are already in priority order in the 
	#	/litetree.table file
	for i in `/usr/bin/cat $LITETREE | /usr/bin/grep -v '^#' | /usr/bin/grep $ME`
    do
		SERVER=`echo $i | /usr/bin/awk -F'|' '{print $2}'`
		DIR=`echo $i | /usr/bin/awk -F'|' '{print $3}'`
		SRC=`echo ${MOUNTDIR}/${SERVER}${DIR}${path} |  /usr/bin/sed -e 's/\/\//\//'`

		# ex. SRC =  /.statelite/mnt/10.2.0.200/etc/FScfg
        # or  /.statelite/mnt/10.2.0.200/root/ssh/
		if [ -e ${SRC} ]; then
			# ok - we found a src for the file or dir
			PATHEND=${#path}
            CHAREND=`echo ${path} | /usr/bin/cut -c${PATHEND}`
            if [ "${CHAREND}" != '/' ] && [ -d ${SRC} ]; then
                FOUND=0
                continue
            fi

            if [ "${CHAREND}" = "/" ] && [ -f ${SRC} ]; then
                FOUND=0
                continue
            fi

            FOUND=1
            ProcessType ${SRC} ${path} ${type} ${isChild}
            break
		fi	
	done

	# couldn't find SRC so use the value in /.default
	# Default behavior is to get from the image
	if [ "$FOUND" = "0"  ]; then
		if [ -e "${DEFAULT}${path}" ]; then
			ProcessType ${DEFAULT}${path} ${path} ${type} ${isChild}
		else
			echo "Could not find ${path}" >>$LOG
		fi
	fi
}

###########################################################################
# Start / MAIN / main
###########################################################################

# mount the persistent dir - if provided
ProcessStatelite
 
# mount all the dirs from the litetree table. 
MountTrees

# process the litefile table
ProcessLitefile

exit 0