#!/bin/sh

#***************************************************************************
# $Copyright: Copyright (c) 2022 Veritas Technologies LLC. All rights reserved $
#***************************************************************************

#
# The following variable is changed by the Makefile to a valid value.
#

MACHINE=rs6000_61

# Intentionally set TMPDIR to /tmp.
TMPDIR=/tmp
BP_BIN=/usr/openv/netbackup/bin
DB_EXT=/usr/openv/netbackup/ext/db_ext
Q1="Please specify the DB2 instance home path name:"

USAGE ()
{
	echo ""
	echo "USAGE:"
	echo "	$0"
	exit 22
}

trap trapped 1 2 3 15

trapped ()
{
	rm -f ${Q1_ANSW} ${Q1_ANSW}.error
	exit 1
}

#
#  This function takes a string as input and echos it out
#  as a question with a prompt for an answer.  Any answer
#  not beginning with y or Y is considered a no.
#

confirm ()
{
	echo "${1} (y/n) [n] "
	read ans
	case "${ans}" in
		Y*|y*)
			echo
			return 1
			;;
		*)
			echo
			return 0
			;;
	esac
}

#
#  Make sure this is being run from root.
#

ISROOT=`id | egrep "^uid=0\("`
if [ "${ISROOT}" = "" ] ; then
	echo ""
	echo "$0 must be run while logged in as root."
	echo ""
	exit 1
fi

is_64_bit=0
if [ $# -ne 0 ] ; then
	USAGE
fi

Q1_ANSW=${TMPDIR}/DB2_Q1.$$
rm -f ${Q1_ANSW}

REAL_BIN_NAME=db2uext2

if [ "${MACHINE}" = "linuxR_x86_3.10.0" -o \
     "${MACHINE}" = "linuxS_x86_4.4.73" -o "${MACHINE}" = "rs6000_61" -o \
     "${MACHINE}" = "solaris10" ] ; then
	DB2_64_BIN=db2uext2.64
else
	DB2_64_BIN=db2uext2
fi

if [ ! -f ${BP_BIN}/${DB2_64_BIN} ] ; then
	echo ""
	echo "ERROR: ${BP_BIN}/${DB2_64_BIN} was not found."
	echo "ERROR: The DB2 agent software has not been installed."
	echo ""
	trapped
fi

done=0
echo ""
DB2_INST=""
while [ ${done} -ne 1 ] ; do
	echo ${Q1}
	read DB2_INST

	if [ ! -d "${DB2_INST}" ] ; then
		echo ""
		echo "Directory \"${DB2_INST}\" does not exist."
		echo "If this DB2 installation is part of a cluster and"
		echo "this node is inactive, this message may safely be"
		echo "ignored.  Otherwise, check to see if DB2 has been"
		echo "installed in \"${DB2_INST}\"."
		echo ""
		if confirm "Do you want to exit this script?"
		then
			:
		else
			trapped
		fi
	else
		echo ${DB2_INST} >> ${Q1_ANSW}
		echo ""
		if confirm "Do you have other DB2 instances?"
		then
			done=1
		fi
	fi
done

#
#  Protect the value of INST with double quotes in case there is
#  a blank in the directory name.
#

while read INST
do
	if [ ! -d "${INST}"/sqllib -o ! -d "${INST}"/sqllib/adm ] ; then
		echo ""
		echo "INSTALLATION WARNING:"
		echo "Directory ${INST}/sqllib or ${INST}/sqllib/adm does not exist."
		echo "If this DB2 installation is part of a cluster and"
		echo "this node is inactive, this warning may safely be"
		echo "ignored.  Otherwise, check to see if DB2 has been"
		echo "installed in ${INST}."
		echo ""
	else

		#
		#  Do some extra checks for the 32bit/64bit scenario.
		#  Only 64bit is supported for DB2.
		#

		if [ "${MACHINE}" = "rs6000_61" ] ; then
			/usr/bin/ls -l /unix | grep unix_64 > /dev/null 2>&1
			if [ $? -eq 0 ] ; then
				is_64_bit=1
			fi
			cut_string="-f2"
		elif [ "${MACHINE}" = "solaris10" -o \
		       "${MACHINE}" = "solaris_x86_10_64" ] ; then
			os_bits=`isainfo -nv`
			echo ${os_bits} | grep "64\-bit" > /dev/null 2>&1
			if [ $? -eq 0 ] ; then
				is_64_bit=1
			fi
			cut_string="-f1,2"
                elif [ "${MACHINE}" = "linuxR_x86_3.10.0" -o \
		       "${MACHINE}" = "linuxS_x86_4.4.73" ] ; then
			os_bits=`uname -p`
			if [ "${os_bits}" = "x86_64" ] ; then
				is_64_bit=1
			fi
			cut_string="-f3"
		fi

		if [ ${is_64_bit} -eq 1 ] ; then
			if [ "${MACHINE}" = "linuxR_x86_3.10.0" -o \
			     "${MACHINE}" = "linuxS_x86_4.4.73" ] ; then
				we_64_type=64
			else
				we_64_type=`file ${BP_BIN}/${DB2_64_BIN} | cut ${cut_string} -d" " | cut -f2 -d":"`
			fi
			if [ ! -f "${INST}"/sqllib/bin/db2 ] ; then
				echo ""
				echo "INSTALLATION WARNING:"
				echo "File ${INST}/sqllib/bin/db2 does not exist."
				echo "Cannot determine its binary type.  Assuming it"
				echo "is the same as ${BP_BIN}/${DB2_64_BIN}."
				they_type="${we_64_type}"
			else
				if [ "${MACHINE}" = "linuxR_x86_3.10.0" -o \
				     "${MACHINE}" = "linuxS_x86_4.4.73" ] ; then
					they_type=`file ${INST}/sqllib/bin/db2 | cut ${cut_string} -d" " | cut -f1 -d"-"`
				else
					they_type=`file ${INST}/sqllib/bin/db2 | cut ${cut_string} -d" " | cut -f2 -d":"`
				fi
			fi
			if [ "${we_64_type}" = "${they_type}" ] ; then
				which_bin=${DB2_64_BIN}
			else
				echo ""
				echo "INSTALLATION ERROR:"
				echo "The file type for ${INST}/sqllib/bin/db2 does not"
				echo "match ${BP_BIN}/${DB2_64_BIN}."
				echo ""
				trapped
			fi
		else
			#  The machines that never had two versions of db2 (HP Itanium
			#  etc) will have DB2_64_BIN set to db2uext2.  Display an
			#  error if not on one of those platforms and is_64_bit is not
			#  set.
			
			if [ "${DB2_64_BIN}" != "db2uext2" ] ; then
				echo ""
				echo "INSTALLATION ERROR:"
				echo "NetBackup for DB2 is not supported on 32 bit machines."
				echo ""
				trapped
			else
				which_bin=${DB2_64_BIN}
			fi
		fi

		if ls -ld "${INST}"/sqllib/adm/${REAL_BIN_NAME} 2>/dev/null | grep "^l" > /dev/null
		then
			rm -f "${INST}"/sqllib/adm/${REAL_BIN_NAME}
		elif [ -f "${INST}"/sqllib/adm/${REAL_BIN_NAME} ] ; then
			rm -f "${INST}"/sqllib/adm/${REAL_BIN_NAME}.org
			mv "${INST}"/sqllib/adm/${REAL_BIN_NAME} "${INST}"/sqllib/adm/${REAL_BIN_NAME}.org
		fi

		echo ""
		echo "Linking ${INST}/sqllib/adm/${REAL_BIN_NAME} to ${BP_BIN}/${which_bin}."
		/bin/ln -s ${BP_BIN}/${which_bin} "${INST}"/sqllib/adm/${REAL_BIN_NAME}

		if [ ! -f "${INST}"/db2.conf ] ; then
			echo ""
			echo "Copying ${DB_EXT}/db2/scripts/db2.conf to ${INST}/db2.conf."
			/bin/cp ${DB_EXT}/db2/scripts/db2.conf "${INST}"/db2.conf
		fi
		/bin/chmod 666 "${INST}"/db2.conf
	fi
done < ${Q1_ANSW}

#
#  Hitting trapped in the previous while doesn't actually exit this script
#  on some platforms so check here if last command executed was ok.  If I
#  hit the trap in the while, I'll trap again and properly exit with a 1.
#

if [ $? -eq 0 -a ! -f ${Q1_ANSW}.error ] ; then

	#
	# Try to clean up an old directory and file.
	#

	if [ -d /usr/openv/netbackup/dbext/comm ] ; then
		rmdir /usr/openv/netbackup/dbext/comm > /dev/null 2>&1
	fi
	rm -f ${BP_BIN}/install_db2

	rm -f ${Q1_ANSW}

	exit 0
else
	trapped
fi