mariadb: Use double quotes where possible

Just to make sure, add double quotes around strings and various
variables. In some cases it could prevent some issues, in other cases it
is just a good practice.

Signed-off-by: Michal Hrusecky <michal.hrusecky@turris.com>

utils/mariadb/files/mysqld.init

@@ -9,12 +9,12 @@ NAME=mysqld
 LOGGER="/usr/bin/logger -p user.err -s -t $NAME --"
 [ -x "$LOGGER" ] || LOGGER="echo"
 
-MYSQLADMIN=/usr/bin/mysqladmin
-MYSQLD=/usr/bin/$NAME
-MYSQLDSAFE=/usr/bin/mysqld_safe
+MYSQLADMIN="/usr/bin/mysqladmin"
+MYSQLD="/usr/bin/$NAME"
+MYSQLDSAFE="/usr/bin/mysqld_safe"
 
 # mysqladmin likes to read /root/.my.cnf which could cause issues.
-export HOME=/etc/mysql
+export HOME="/etc/mysql"
 
 # Safeguard (relative paths, core dumps...)
 cd /
@@ -41,8 +41,8 @@ mysqld_status() {
 	fi
 
 	ps_alive=0
-	pidfile=$(mysqld_get_param pid-file)
-	if [ -f "$pidfile" ] && kill -0 $(cat "$pidfile") >/dev/null 2>&1; then
+	pidfile="$(mysqld_get_param pid-file)"
+	if [ -f "$pidfile" ] && kill -0 "$(cat "$pidfile")" >/dev/null 2>&1; then
 		ps_alive=1
 	fi
 
@@ -63,85 +63,85 @@ start() {
 
 	hint="please fix your server configuration in /etc/mysql/"
 
-	for i in $MYSQLD $MYSQLADMIN $MYSQLDSAFE; do
-		if [ ! -x $i ]; then
-			$LOGGER $i is missing
+	for i in "$MYSQLD" "$MYSQLADMIN" "$MYSQLDSAFE"; do
+		if [ ! -x "$i" ]; then
+			$LOGGER "$i is missing"
 			exit 1
 		fi
 	done
 
-	if [ ! -r $conf ]; then
-		$LOGGER $conf cannot be read
+	if [ ! -r "$conf" ]; then
+		$LOGGER "$conf cannot be read"
 		exit 1
 	fi
 
-	config_load $NAME
+	config_load "$NAME"
 
 	config_get_bool enabled general enabled 0
-	if [ $enabled -eq 0 ]; then
-		$LOGGER service not enabled in /etc/config/$NAME
+	if [ "$enabled" -eq 0 ]; then
+		$LOGGER "service not enabled in /etc/config/$NAME"
 		exit 1
 	fi
 
 	config_get options general options
 
-	datadir=$(mysqld_get_param datadir)
-	tmpdir=$(mysqld_get_param tmpdir)
+	datadir="$(mysqld_get_param datadir)"
+	tmpdir="$(mysqld_get_param tmpdir)"
 
 	if [ -z "$datadir" ]; then
-		$LOGGER datadir is not set
-		$LOGGER $hint
+		$LOGGER "datadir is not set"
+		$LOGGER "$hint"
 		exit 1
 	fi
 
 	if [ -z "$tmpdir" ]; then
-		$LOGGER tmpdir is not set
-		$LOGGER $hint
+		$LOGGER "tmpdir is not set"
+		$LOGGER "$hint"
 		exit 1
 	fi
 
 	if [ ! -f "$datadir/mysql/tables_priv.MAD" ]; then
 		args="--force"
-		basedir=$(mysqld_get_param basedir)
+		basedir="$(mysqld_get_param basedir)"
 		[ -n "$basedir" ] && args="$args --basedir=$basedir"
 
-		$LOGGER Cannot detect privileges table. You might need to run
-		$LOGGER \'mysql_install_db "$args"\'
-		$LOGGER to initialize the system tables.
+		$LOGGER "Cannot detect privileges table. You might need to run"
+		$LOGGER "'mysql_install_db \"$args\"'"
+		$LOGGER "to initialize the system tables."
 		exit 1
 	fi
 
 	# Start daemon
 	if mysqld_status check_alive; then
-		$LOGGER already running
+		$LOGGER "server is already running"
 	else
-		for i in $logdir $rundir; do
+		for i in "$logdir" "$rundir"; do
 			opts="-m 0750"
-			if ! [ -e $i ]; then
+			if ! [ -e "$i" ]; then
 				# $rundir needs to be accessible for
 				# clients
-				if [ $i = $rundir ]; then
+				if [ "$i" = "$rundir" ]; then
 					opts=
 				fi
-				mkdir -p $opts $i
-				[ -d $i ] && chown mariadb:mariadb $i
+				mkdir -p $opts "$i"
+				[ -d "$i" ] && chown mariadb:mariadb "$i"
 			fi
 		done
 
-		$MYSQLDSAFE $options >/dev/null 2>&1 &
+		"$MYSQLDSAFE" $options >/dev/null 2>&1 &
 	fi
 }
 
 stop() {
 	if ! mysqld_status check_dead; then
-		$MYSQLADMIN shutdown
+		"$MYSQLADMIN" shutdown
 	fi
 }
 
 reload() {
 	if mysqld_status check_alive; then
-		$MYSQLADMIN reload
+		"$MYSQLADMIN" reload
 	else
-		$LOGGER not running
+		$LOGGER "server is not running"
 	fi
 }