#!/bin/bash

set -e

. /usr/share/debconf/confmodule

# If we have no versions, we do not need to worry about obsolete ones
if ! [ -d /usr/lib/postgresql ] || \
    [ ! -e /usr/share/postgresql-common/supported-versions ]; then
    db_stop
    exit 0
fi

# at some points we obsolete major versions within unstable; force the
# obsoletion notifications when upgrading over those
if dpkg --compare-versions "$2" lt-nl 71 2>/dev/null; then
    db_fset postgresql-common/obsolete-major seen false
fi

# determine versions
for v in `ls /usr/lib/postgresql/`; do
    # Ignore old libraries, etc.
    if [ -x /usr/lib/postgresql/$v/bin/psql ]; then
        AVAILABLE="$AVAILABLE $v"
    fi
done

SUPPORTED=`sh /usr/share/postgresql-common/supported-versions`
LATEST=`echo "$SUPPORTED" | sort -g | tail -1`

db_fget postgresql-common/obsolete-major seen || true

if [ "$RET" != "true" ]; then
    for v in $AVAILABLE; do
        unset sup
        for s in $SUPPORTED; do 
            if [ "$v" = "$s" ] || [[ "$v" > "$LATEST" ]]; then
                sup=1
                break
            fi
        done
        if [ "$sup" ]; then
            continue
        fi

        if dpkg -s "postgresql-client-$v" 2>/dev/null | grep -q ^Version: ; then
            db_fset postgresql-common/obsolete-major seen false
            db_subst postgresql-common/obsolete-major old $v
            db_subst postgresql-common/obsolete-major latest $LATEST
            db_input high postgresql-common/obsolete-major || true
            db_go || true
        fi
    done
fi

db_stop
