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#set -x
# checkinstall script to validate backing out a patch.
# directory format option.
#
#       @(#)patch_checkinstall 1.2 95/10/10 SMI
#
# Copyright (c) 1995 by Sun Microsystems, Inc.
# All rights reserved
#

PATH=/usr/sadm/bin:$PATH

LATER_MSG="PaTcH_MsG 6 ERROR: A later version of this patch is applied."
NOPATCH_MSG="PaTcH_MsG 2 ERROR: Patch number $ACTIVE_PATCH is not installed"
NEW_LIST=""

# Get OLDLIST
. $1

#
# Confirm that the patch that got us here is the latest one installed on
# the system and remove it from PATCHLIST.
#
Is_Inst=0
Skip=0
active_base=`echo $ACTIVE_PATCH | nawk '
        { print substr($0, 1, match($0, "-")-1) } '`
active_inst=`echo $ACTIVE_PATCH | nawk '
        { print substr($0, match($0, "-")+1) } '`
for patchappl in ${OLDLIST}; do
        appl_base=`echo $patchappl | nawk '
                { print substr($0, 1, match($0, "-")-1) } '`
        if [ $appl_base = $active_base ]; then
                appl_inst=`echo $patchappl | nawk '
                        { print substr($0, match($0, "-")+1) } '`
                result=`expr $appl_inst \> $active_inst`
                if [ $result -eq 1 ]; then
                        puttext "$LATER_MSG"
                        exit 3
                elif [ $appl_inst = $active_inst ]; then
                        Is_Inst=1
                        Skip=1
                fi
        fi
        if [ $Skip = 1 ]; then
                Skip=0
        else
                NEW_LIST="${NEW_LIST} $patchappl"
        fi
done

if [ $Is_Inst = 0 ]; then
        puttext "$NOPATCH_MSG"
        exit 3
fi

#
# OK, all's well. Now condition the key variables.
#
echo "PATCHLIST=${NEW_LIST}" >> $1
echo "SUNW_PATCHID=" >> $1
echo "PATCH_INFO_$ACTIVE_PATCH=backed out" >> $1

# Get the current PATCH_OBSOLETES and condition it
Old_Obsoletes=$PATCH_OBSOLETES

echo $ACTIVE_OBSOLETES | sed 'y/\ /\n/' | \
nawk -v PatchObsList="$Old_Obsoletes" '
        BEGIN {
                printf("PATCH_OBSOLETES=");
                PatchCount=split(PatchObsList, PatchObsComp, " ");

                for(PatchIndex in PatchObsComp) {
                        Atisat=match(PatchObsComp[PatchIndex], "@");
                        PatchObs[PatchIndex]=substr(PatchObsComp[PatchIndex], 0, Atisat-1);
                        PatchObsCnt[PatchIndex]=substr(PatchObsComp[PatchIndex], Atisat+1);
                }
        }
        {
                for(PatchIndex in PatchObs) {
                        if (PatchObs[PatchIndex] == $0) {
                                PatchObsCnt[PatchIndex]=PatchObsCnt[PatchIndex]-1;
                        }
                }
                next;
        }
        END {
                for(PatchIndex in PatchObs) {
                        if ( PatchObsCnt[PatchIndex] > 0 ) {
                                printf("%s@%d ", PatchObs[PatchIndex], PatchObsCnt[PatchIndex]);
                        }
                }
                printf("\n");
        } ' >> $1

        # remove the used parameters
        echo "ACTIVE_OBSOLETES=" >> $1
        echo "SUNW_OBSOLETES=" >> $1

exit 0