#!/bin/sh

## # Once off change for u4 FKU SUNWcsr. Needed to work around a deficiency in pkg
## # level script templates causing them not to populate prototype file for undo pkg
## # correctly across object type/class changes.
## #
## # See full comments in checkinstall.
PATCH=/usr/bin/patch
SED="/usr/bin/sed"
CP="/usr/bin/cp"
MV="/usr/bin/mv"

OLD_PATCH_SEPARATOR="___Old_File_Diff_Separator_aBcDeFgHiJkLmN___OjK___5924894_6548915___"
PATCH_SAVE_SUFFIX="pre${ACTIVE_PATCH}"

get_orig()
{
    cat $1 | \
	$SED -ne "1,/${OLD_PATCH_SEPARATOR}/{/${OLD_PATCH_SEPARATOR}/d;p;}"
}

get_diff()
{
    cat $1 | \
	$SED -ne "/${OLD_PATCH_SEPARATOR}/,\${/${OLD_PATCH_SEPARATOR}/d;p;}"
}


[ "$BASEDIR" = "/" ] || BASEDIR=$BASEDIR/

while read src dst ; do

    # File etc/inet/ipnodes was replaced by a symlink on patch installation.
    # Restore the original etc/inet/ipnodes file on backout. The cp/mv combination
    # achieves replacement of the symlink, instead of clobbering the symlink target.
    # All other files of class preserve are a noop.
    
    if [ "`echo $dst | $SED \"s|^$BASEDIR||\"`" = "etc/inet/ipnodes" ] ; then 
	$CP -p $src $dst.$$135642
	$MV -f $dst.$$135642 $dst
	continue
    fi

    realdst="`echo $dst| /bin/sed -e 's/\.old_and_patch$//'`"
    if [ "$realdst" != "$dst" ]; then
	cp "${src}" "${dst}"
	if [ -f "${realdst}" ] ; then
	    get_diff $src | $PATCH -o /dev/null -R $realdst >/dev/null 2>&1
	    if [ "$?" = "0" ] ; then
		get_diff $src | $PATCH -R $realdst >/dev/null 2>&1
	    else
		get_orig $src > "$realdst.${PATCH_SAVE_SUFFIX}"
		if [ -f "${realdst}.rej" ] ; then
		    rm -f "${realdst}.rej"
		fi
	    fi
	else
	    get_orig $src > $realdst
	fi
    fi
done 
## # Fix section end.

exit 0