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diff --git a/mariadb-scripts-common.sh b/mariadb-scripts-common.sh
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+#!/bin/sh
+
+# Some useful functions used in other MariaDB helper scripts
+# This scripts defines variables datadir, errlogfile, socketfile
+
+export LC_ALL=C
+
+# extract value of a MariaDB option from config files
+# Usage: get_mysql_option VARNAME DEFAULT SECTION [ SECTION, ... ]
+# result is returned in $result
+# We use my_print_defaults which prints all options from multiple files,
+# with the more specific ones later; hence take the last match.
+get_mysql_option(){
+	if [ $# -ne 3 ] ; then
+		echo "get_mysql_option requires 3 arguments: section option default_value"
+		return
+	fi
+	sections="$1"
+	option_name="$2"
+	default_value="$3"
+	result=`/usr/bin/my_print_defaults $my_print_defaults_extra_args $sections | sed -n "s/^--${option_name}=//p" | tail -n 1`
+	if [ -z "$result" ]; then
+	    # not found, use default
+	    result="${default_value}"
+	fi
+}
+
+# For the case of running more instances via systemd, scripts that source
+# this file can get --default-group-suffix or similar option as the first
+# argument. The utility my_print_defaults needs to use it as well, so the
+# scripts sourcing this file work with the same options as the daemon.
+my_print_defaults_extra_args=''
+while echo "$1" | grep -q '^--defaults' ; do
+	my_print_defaults_extra_args="${my_print_defaults_extra_args} $1"
+	shift
+done
+
+# Defaults here had better match what mariadbd-safe will default to
+# The option values are generally defined on three important places
+# on the default installation:
+#  1) default values are hardcoded in the code of mariadbd daemon or
+#     mariadbd-safe script
+#  2) configurable values are defined in /etc/my.cnf
+#  3) default values for helper scripts are specified bellow
+# So, in case values are defined in my.cnf, we need to get that value.
+# In case they are not defined in my.cnf, we need to get the same value
+# in the daemon, as in the helper scripts. Thus, default values here
+# must correspond with values defined in mariadbd-safe script and source
+# code itself.
+
+server_sections="mysqld_safe mysqld server mysqld-10.5 mariadb mariadb-10.5 mariadbd mariadbd-10.5 client-server galera"
+
+get_mysql_option "$server_sections" datadir "/var/lib/mysql"
+datadir="$result"
+
+# if there is log_error in the my.cnf, my_print_defaults still
+# returns log-error
+# log-error might be defined in mysqld_safe and mysqld sections,
+# the former has bigger priority
+get_mysql_option "$server_sections" log-error "$datadir/`uname -n`.err"
+errlogfile="$result"
+
+get_mysql_option "$server_sections" socket "/var/lib/mysql/mysql.sock"
+socketfile="$result"
+
+get_mysql_option "$server_sections" pid-file "$datadir/`uname -n`.pid"
+pidfile="$result"
+