fix shellcheck warnings in helper scripts

chrony.dhclient

@@ -3,18 +3,18 @@
 SERVERFILE=$SAVEDIR/chrony.servers.$interface
 
 chrony_config() {
-	rm -f $SERVERFILE
+	rm -f "$SERVERFILE"
 	if [ "$PEERNTP" != "no" ]; then
 		for server in $new_ntp_servers; do
-			echo "$server ${NTPSERVERARGS:-iburst}" >> $SERVERFILE
+			echo "$server ${NTPSERVERARGS:-iburst}" >> "$SERVERFILE"
 		done
 		/usr/libexec/chrony-helper update-daemon || :
 	fi
 }
 
 chrony_restore() {
-	if [ -f $SERVERFILE ]; then
+	if [ -f "$SERVERFILE" ]; then
-		rm -f $SERVERFILE
+		rm -f "$SERVERFILE"
 		/usr/libexec/chrony-helper update-daemon || :
 	fi
 }

chrony.helper

@@ -12,8 +12,8 @@ helper_dir=/var/run/chrony-helper
 added_servers_file=$helper_dir/added_servers
 
 network_sysconfig_file=/etc/sysconfig/network
-dhclient_servers_files=/var/lib/dhclient/chrony.servers.*
+dhclient_servers_files="/var/lib/dhclient/chrony.servers.*"
-dnssrv_servers_files=$helper_dir/dnssrv@*
+dnssrv_servers_files="$helper_dir/dnssrv@*"
 dnssrv_timer_prefix=chrony-dnssrv@
 
 . $network_sysconfig_file &> /dev/null
@@ -50,27 +50,30 @@ update_daemon() {
 
     all_servers=$(
         echo "$all_servers_with_args" |
-            while read server serverargs; do
+            while read -r server serverargs; do
                 echo "$server"
             done | sort -u)
     added_servers=$( (
         cat $added_servers_file 2> /dev/null
         echo "$all_servers_with_args" |
-            while read server serverargs; do
+            while read -r server serverargs; do
                 [ -z "$server" ] && continue
                 chrony_command "add server $server $serverargs" &> /dev/null &&
                     echo "$server"
             done) | sort -u)
 
     comm -23 <(echo -n "$added_servers") <(echo -n "$all_servers") |
-        while read server; do
+        while read -r server; do
             chrony_command "delete $server" &> /dev/null
         done
 
     added_servers=$(comm -12 <(echo -n "$added_servers") <(echo -n "$all_servers"))
 
-    [ -n "$added_servers" ] && echo "$added_servers" > $added_servers_file ||
+    if [ -n "$added_servers" ]; then
+        echo "$added_servers" > $added_servers_file
+    else
         rm -f $added_servers_file
+    fi
 }
 
 get_dnssrv_servers() {
@@ -81,10 +84,9 @@ get_dnssrv_servers() {
         return 1
     fi
 
-    output=$(dig "$name" srv +short +ndots=2 +search 2> /dev/null)
+    output=$(dig "$name" srv +short +ndots=2 +search 2> /dev/null) || return 0
-    [ $? -ne 0 ] && return 0
 
-    echo "$output" | while read prio weight port target; do
+    echo "$output" | while read -r _ _ port target; do
         server=${target%.}
         [ -z "$server" ] && continue
         echo "$server port $port ${NTPSERVERARGS:-iburst}"
@@ -112,13 +114,19 @@ update_dnssrv_servers() {
     check_dnssrv_name "$name" || return 1
 
     servers=$(get_dnssrv_servers "$name")
-    [ -n "$servers" ] && echo "$servers" > "$srv_file" || rm -f "$srv_file"
+    if [ -n "$servers" ]; then
+        echo "$servers" > "$srv_file"
+    else
+        rm -f "$srv_file"
+    fi
 }
 
 set_dnssrv_timer() {
     local state=$1 name=$2
     local srv_file=$helper_dir/dnssrv@$name servers
-    local timer=$dnssrv_timer_prefix$(systemd-escape "$name").timer
+    local timer
+
+    timer=$dnssrv_timer_prefix$(systemd-escape "$name").timer || return 1
 
     check_dnssrv_name "$name" || return 1
 
@@ -155,8 +163,10 @@ is_source_line() {
 }
 
 list_static_sources() {
-    while read line; do
+    while read -r line; do
-        is_source_line "$line" && echo "$line" || :
+        if is_source_line "$line"; then
+            echo "$line"
+        fi
     done < $chrony_conf
 }
 
@@ -165,11 +175,11 @@ set_static_sources() {
 
     new_config=$(
         sources=$(
-            while read line; do
+            while read -r line; do
                 is_source_line "$line" && echo "$line"
             done)
 
-        while read line; do
+        while read -r line; do
             if ! is_source_line "$line"; then
                 echo "$line"
                 continue
@@ -178,9 +188,12 @@ set_static_sources() {
             tmp_sources=$(
                 local removed=0
 
-                echo "$sources" | while read line2; do
+                echo "$sources" | while read -r line2; do
-                    [ "$removed" -ne 0 -o "$line" != "$line2" ] && \
+                    if [ "$removed" -ne 0 ] || [ "$line" != "$line2" ]; then
-                        echo "$line2" || removed=1
+                        echo "$line2"
+                    else
+                        removed=1
+                    fi
                 done)
 
             [ "$sources" == "$tmp_sources" ] && continue