scripts: only overwrite source file if differs

scripts/uncrustify/uncrustify-wrapper.sh

@@ -55,17 +55,27 @@ fi
 if [ -n "$2" ]; then
 	# Do uncrustify.
 	echo "$2"
-	${UNCRUSTIFY} -q -c "$1" -f "$2" > "$2".new
+	TEMPFILE_UNCRUSTIFY=$(mktemp)
+	${UNCRUSTIFY} -q -c "$1" -f "$2" > "$TEMPFILE_UNCRUSTIFY"
 
 	if [ $? -ne 0 ]; then
 		echo "Failed to format '$2'"
 		exit 1
 	else
-		fix_indentation_char < "$2".new                \
+		TEMPFILE_AWK=$(mktemp)
+		fix_indentation_char < "$TEMPFILE_UNCRUSTIFY"  \
 		| add_newline_before_namespace_closing_bracket \
 		| fix_semicolon_indentation                    \
-		> "$2"
-	fi
+		> "$TEMPFILE_AWK"
+
+		rm "$TEMPFILE_UNCRUSTIFY"
 
-	rm "$2".new
+		# Only overwrite if there are differences.
+		diff "$2" "$TEMPFILE_AWK" 2>/dev/null
+		if [ $? -ne 0 ]; then
+			mv "$TEMPFILE_AWK" "$2"
+		else
+			rm "$TEMPFILE_AWK"
+		fi
+	fi
 fi