fix socket path creation

based on this bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915834

It seems that setting the Temp file system to ro overly restricts access
to it such that other applications (like ssh), can't function properly.
That seems like a error to fix in systemd to me, but regardless we
obviously cant use TempDirectory=/path:ro if its going to impact other
applications like that.

Instead specify a specific RuntimeDirectory that systemd can clean up
for us, and modify irqbalance and irqbalance-ui to create the comms
socket there.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

irqbalance.h

@@ -158,7 +158,7 @@ extern unsigned int log_mask;
 #endif /* HAVE_LIBSYSTEMD */
 
 #define SOCKET_PATH "irqbalance"
-#define SOCKET_TMPFS "/var/run"
+#define SOCKET_TMPFS "/run/irqbalance/"
 
 #endif /* __INCLUDE_GUARD_IRQBALANCE_H_ */
 

misc/irqbalance.service

@@ -12,7 +12,7 @@ NoNewPrivileges=yes
 ReadOnlyPaths=/
 ReadWritePaths=/proc/irq
 RestrictAddressFamilies=AF_UNIX
-TemporaryFileSystem=/run:ro
+RuntimeDirectory=irqbalance/
 
 [Install]
 WantedBy=multi-user.target

ui/irqbalance-ui.h

@@ -8,7 +8,7 @@
 #include <glib-unix.h>
 
 #define SOCKET_PATH "irqbalance"
-#define SOCKET_TMPFS "/var/run"
+#define SOCKET_TMPFS "/run/irqbalance"
 
 #define STATS "stats"
 #define SET_SLEEP "settings sleep "