#!/bin/sh
#
# $Header: buildtools/scripts/oraenv.sh /linux32/6 2008/11/10 23:53:34 shiremat Exp $ oraenv.sh.pp Copyr (c) 1991 Oracle
# 
# Copyright (c) 1991, 2008, Oracle and/or its affiliates.All rights reserved. 
#
# This routine is used to condition a Bourne shell user's environment
# for access to an ORACLE database.  It should be installed in
# the system local bin directory.
#
# The user will be prompted for the database SID, unless the variable
# ORAENV_ASK is set to NO, in which case the current value of ORACLE_SID
# is used.
# An asterisk '*' can be used to refer to the NULL SID.
#
# 'dbhome' is called to locate ORACLE_HOME for the SID.  If
# ORACLE_HOME cannot be located, the user will be prompted for it also.
# The following environment variables are set:
#
#       ORACLE_SID      Oracle system identifier
#       ORACLE_HOME     Top level directory of the Oracle system hierarchy
#       PATH            Old ORACLE_HOME/bin removed, new one added
#       ORACLE_BASE     Top level directory for storing data files and 
#                       diagnostic information.
#
# usage: . oraenv
#
# NOTE:		Due to constraints of the shell in regard to environment
# -----		variables, the command MUST be prefaced with ".". If it
#		is not, then no permanent change in the user's environment
#		can take place.
#
#####################################

case ${ORACLE_TRACE:-""} in

    T)  set -x ;;
esac

#
# Determine how to suppress newline with echo command.
#
N=
C=
if echo "\c" | grep c >/dev/null 2>&1; then
    N='-n'
else
    C='\c'
fi

#
# Set minimum environment variables
#

# ensure that OLDHOME is non-null
if [ ${ORACLE_HOME:-0} = 0 ]; then
    OLDHOME=$PATH
else
    OLDHOME=$ORACLE_HOME
fi
case ${ORAENV_ASK:-""} in                       #ORAENV_ASK suppresses prompt when set

    NO)	NEWSID="$ORACLE_SID" ;;
    *)	case "$ORACLE_SID" in
	    "")	ORASID=$LOGNAME ;;
	    *)	ORASID=$ORACLE_SID ;;
	esac
	echo $N "ORACLE_SID = [$ORASID] ? $C"
	read NEWSID
	case "$NEWSID" in
	    "")		ORACLE_SID="$ORASID" ;;
	    *)	        ORACLE_SID="$NEWSID" ;;		
	esac ;;
esac
export ORACLE_SID

ORAHOME=`dbhome "$ORACLE_SID"`
case $? in
    0)	ORACLE_HOME=$ORAHOME ;;
    *)	echo $N "ORACLE_HOME = [$ORAHOME] ? $C"
	read NEWHOME
	case "$NEWHOME" in
	    "")	ORACLE_HOME=$ORAHOME ;;
	    *)	ORACLE_HOME=$NEWHOME ;;
	esac ;;
esac

export ORACLE_HOME 

#
# Reset LD_LIBRARY_PATH
#
case ${LD_LIBRARY_PATH:-""} in
    *$OLDHOME/lib*)     LD_LIBRARY_PATH=`echo $LD_LIBRARY_PATH | \
                            sed "s;$OLDHOME/lib;$ORACLE_HOME/lib;g"` ;;
    *$ORACLE_HOME/lib*) ;;
    "")                 LD_LIBRARY_PATH=$ORACLE_HOME/lib ;;
    *)                  LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATH ;;
esac

export LD_LIBRARY_PATH

#
# Put new ORACLE_HOME in path and remove old one
#

case "$OLDHOME" in
    "")	OLDHOME=$PATH ;;	#This makes it so that null OLDHOME can't match
esac				#anything in next case statement

case "$PATH" in
    *$OLDHOME/bin*)	PATH=`echo $PATH | \
			    sed "s;$OLDHOME/bin;$ORACLE_HOME/bin;g"` ;;
    *$ORACLE_HOME/bin*)	;;
    *:)			PATH=${PATH}$ORACLE_HOME/bin: ;;
    "")			PATH=$ORACLE_HOME/bin ;;
    *)			PATH=$PATH:$ORACLE_HOME/bin ;;
esac

export PATH 

# Locate "osh" and exec it if found
ULIMIT=`LANG=C ulimit 2>/dev/null`

if [ $? = 0 -a "$ULIMIT" != "unlimited" ] ; then
  if [ "$ULIMIT" -lt 2113674 ] ; then

    if [ -f $ORACLE_HOME/bin/osh ] ; then
	exec $ORACLE_HOME/bin/osh
    else
	for D in `echo $PATH | tr : " "`
	do
	    if [ -f $D/osh ] ; then
		exec $D/osh
	    fi
	done
    fi

  fi

fi

# Set the value of ORACLE_BASE in the environment.  Use the orabase
# executable from the corresponding ORACLE_HOME, since the ORACLE_BASE
# of different ORACLE_HOMEs can be different.

# The return value of orabase will be determined based on the following :
#
#  1.  Value of ORACLE_BASE in the environment.
#  2.  Get the value of ORACLE_BASE from oraclehomeproperties.xml as 
#      set in the ORACLE_HOME inventory.

ORABASE_EXEC=$ORACLE_HOME/bin/orabase

if [ ${ORACLE_BASE:-"x"} != "x" ]; then
   echo "The Oracle base for ORACLE_HOME=$ORACLE_HOME is $ORACLE_BASE"
else
   if [ -w $ORACLE_HOME/inventory/ContentsXML/oraclehomeproperties.xml ]; then
     if [ -e $ORABASE_EXEC ] ; then
	if [ -x $ORABASE_EXEC ]; then
	   ORACLE_BASE=`$ORABASE_EXEC`
	   export ORACLE_BASE
	   echo "The Oracle base for ORACLE_HOME=$ORACLE_HOME is $ORACLE_BASE"
	else
	   echo "The $ORACLE_HOME/bin/orabase binary does not have execute privilege"
	   echo "for the current user, $USER.  Rerun the script after changing"
	   echo "the permission of the mentioned executable."
	fi
     else
	ORACLE_BASE=$ORACLE_HOME
	export ORACLE_BASE
	echo "The Oracle base for ORACLE_HOME=$ORACLE_HOME is $ORACLE_BASE"
     fi
   else
     echo "ORACLE_BASE environment variable is not being set since this"
     echo "information is not available for the current user ID $USER."
     echo "You can set ORACLE_BASE manually if it is required."
   fi
fi

#
# Install any "custom" code here
#