Support --defaults-group-suffix option in all starting scripts

Resolves: #1485777

mariadb.spec

@@ -1448,6 +1448,8 @@ fi
 * Mon Aug 28 2017 Honza Horak <hhorak@redhat.com> - 3:10.2.8-2
 - Fix paths in galera_recovery and galera_new_cluster
   Resolves: #1403416
+- Support --defaults-group-suffix properly in systemd unit file
+  Resolves: #1485777
 
 * Sun Aug 20 2017 Honza Horak <hhorak@redhat.com> - 3:10.2.8-1
 - Rebase to 10.2.8

mysql-scripts-common.sh

@@ -18,13 +18,23 @@ get_mysql_option(){
 	sections="$1"
 	option_name="$2"
 	default_value="$3"
-	result=`@bindir@/my_print_defaults $sections | sed -n "s/^--${option_name}=//p" | tail -n 1`
+	result=`@bindir@/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, scrits 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 mysqld_safe will default to
 # The option values are generally defined on three important places
 # on the default installation:

mysql@.service.in

@@ -40,13 +40,13 @@ Type=notify
 User=mysql
 Group=mysql
 
-ExecStartPre=@libexecdir@/mysql-check-socket
-ExecStartPre=@libexecdir@/mysql-prepare-db-dir %n
+ExecStartPre=@libexecdir@/mysql-check-socket --defaults-group-suffix=.%I
+ExecStartPre=@libexecdir@/mysql-prepare-db-dir --defaults-group-suffix=.%I %n
 # MYSQLD_OPTS here is for users to set in /etc/systemd/system/@DAEMON_NAME@@.service.d/MY_SPECIAL.conf
 # Note: we set --basedir to prevent probes that might trigger SELinux alarms,
 # per bug #547485
 ExecStart=@libexecdir@/mysqld --defaults-group-suffix=.%I --basedir=@prefix@ $MYSQLD_OPTS $_WSREP_NEW_CLUSTER
-ExecStartPost=@libexecdir@/mysql-check-upgrade
+ExecStartPost=@libexecdir@/mysql-check-upgrade --defaults-group-suffix=.%I
 
 # Setting this to true can break replication and the Type=notify settings
 # See also bind-address mysqld option.