###
### some global variables etc
###
dbc_go(){
    local need_admin_pw dumpfile nowtime rmscript rmsql purgescript purgesql tsubstfile

    . /usr/share/dbconfig-common/dpkg/common
    _dbc_debug "(prerm) dbc_go() $@"

    ## With dbconfig-no-thanks installed we don't need to do anything.
    if dbc_no_thanks ; then
        return 0
    fi

    dbc_config "$@" || return $?

    ###
    ### get all the settings we need
    ###
    dbc_read_package_config || return $?
    # and re-run config for db-specific settings
    dbc_set_dbtype_defaults $dbc_dbtype || return $?

    if echo "$dbc_authenticated_dbtypes" | grep -q "$dbc_dbtype"; then
        if [ "$dbc_dbtype" = "pgsql" ] && \
               [ "$dbc_authmethod_admin" = "ident" ];
        then
            need_admin_pw=""
        else
            need_admin_pw="yup"
            # Note: dpkg/config has the same code
            if [ $dbc_dbtype = mysql ] && _dbc_mysql_get_debian_sys_maint ; then
                db_set $dbc_package/$dbc_dbtype/admin-user "$dbc_dbadmin"
                db_fset $dbc_package/$dbc_dbtype/admin-user seen true
                db_set $dbc_package/$dbc_dbtype/admin-pass "$dbc_dbadmpass"
                db_fset $dbc_package/$dbc_dbtype/admin-pass seen true
            fi
        fi
    else
        need_admin_pw=""
    fi

    if [ "$dbc_command" = "remove" ] && [ ! "$dbc_frontend" ]; then
        ###
        ### if they didn't want our help installing,  we should assume
        ### they don't want our help removing either
        ###
        if [ "$dbc_install" != "true" ]; then return 0; fi

        ###
        ### ask the admin if we should help with removal
        ### but only if they didn't see the question before
        ### or if we are here after an error
        ###
        if [ "$dbc_remove" ]; then
            db_set $dbc_package/dbconfig-remove "$dbc_remove"
        fi
        db_input $dbc_prio_high $dbc_package/dbconfig-remove || true
        db_go || true
        db_get $dbc_package/dbconfig-remove && dbc_remove="$RET"

        if [ "$dbc_remove" != "true" ]; then
            return 0;
        fi

        ###
        ###	package removal hooks
        ###
        rmscript=/usr/share/dbconfig-common/scripts/$dbc_package/remove/$dbc_dbtype
        rmsql=/usr/share/dbconfig-common/data/$dbc_package/remove/$dbc_dbtype
        # run the script if it exists
        if [ -f "$rmscript" ]; then
            # get the admin user password
            if [ "$need_admin_pw" ]; then
                dbc_get_admin_pass || return $?
            fi
            dbc_logpart "running maintainer removal script hook... "
            if ! sh -c "$rmscript \"$@\""; then
                dbc_error="$rmscript existed with non-zero status"
                dbc_remove_error "running maintainer removal hook" || return $?
                [ "$dbc_tried_again" ] && return 0
            fi
            dbc_logline "done"
        fi
        # run the sql if it exists
        if [ -f "$rmsql" ]; then
            # get the admin user password
            if [ "$need_admin_pw" ]; then
                dbc_get_admin_pass || return $?
            fi
            dbc_logpart "running maintainer removal sql hook... "
            if [ ! "$dbc_sql_substitutions" ]; then
                $dbc_sqlfile_cmd $rmsql || \
                    dbc_remove_error "running maintainer removal sql hook" || \
                    return $?
                [ "$dbc_tried_again" ] && return 0
            else
                tsubstfile=$(dbc_mktemp)
                /usr/sbin/dbconfig-generate-include -f template -o template_infile=$rmsql $dbc_packageconfig > $tsubstfile
                $dbc_sqlfile_cmd $tsubstfile || \
                    dbc_remove_error "running maintainer removal sql hook" || \
                    return $?
                rm -f $tsubstfile
                [ "$dbc_tried_again" ] && return 0
            fi
            dbc_logline "done"
        fi

        ###
        ### ask the admin if the database should be purged
        ### but only if they didn't see the question before
        ### or if we are here after an error
        ###
        db_input $dbc_prio_high $dbc_package/purge || true
        db_go || true
        db_get $dbc_package/purge
        dbc_purge="$RET"

        if [ "$dbc_purge" = "true" ]; then
            # get the admin user password
            if [ "$need_admin_pw" ]; then
                dbc_get_admin_pass || return $?
            fi

            # dump the database into a temporary file
            # Note: nearly equal logic exists in postinst; probably
            # should stay in sync
            nowtime=$(date +%Y-%m-%d-%H.%M)
            if [ ! $(dirname /var/tmp/$dbc_package) = /var/tmp ]; then
                mkdir -p $(dirname /var/tmp/$dbc_package)
            fi
            dumpfile=$(mktemp /var/tmp/$dbc_package.$dbc_dbname.$nowtime.$dbc_dbtype.XXXXXX)
            if [ ! -f $dumpfile ]; then
                dbc_remove_error "creating temporary file for database dump" || \
                    return $?
                [ "$dbc_tried_again" ] && return 0
            fi
            dbc_logline "dbconfig-common: dumping $dbc_dbtype database $dbc_dbname to $dumpfile"
            $dbc_dump_cmd $dumpfile || dbc_remove_error "dumping database" || \
                return $?
            [ "$dbc_tried_again" ] && return 0
            dbc_logline "dbconfig-common: dropping $dbc_dbtype database $dbc_dbname"
            $dbc_dropdb_cmd || dbc_remove_error "dropping database" || return $?
            [ "$dbc_tried_again" ] && return 0

            dbc_logline "dbconfig-common: revoking privileges for user $dbc_dbuser on $dbc_dbname"
            $dbc_dropuser_cmd
        fi
    fi
}