[usb_moded] Make init-done state generally available

There are situations where usb-moded needs to behave in slightly different
manner depending on whether it is executed as a part of device starup
sequence or (restarted) after the device is already fully booted up.

Make the related init-done functions available to all modules within
usb-moded source tree.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

src/usb_moded-dbus.c

@@ -194,6 +194,9 @@ static DBusHandlerResult msg_handler(DBusConnection *const connection, DBusMessa
   if( type == DBUS_MESSAGE_TYPE_SIGNAL )
   {
 	if( !strcmp(interface, INIT_DONE_INTERFACE) && !strcmp(member, INIT_DONE_SIGNAL) ) {
+		/* Update the cached state value */
+		set_init_done(true);
+
 		/* Auto-disable rescue mode when bootup is finished */
 		if( rescue_mode ) {
 			rescue_mode = FALSE;
@@ -598,6 +601,9 @@ gboolean usb_moded_dbus_init_connection(void)
   /* Listen to init-done signals */
   dbus_bus_add_match(dbus_connection_sys, INIT_DONE_MATCH, 0);
 
+  /* Re-check flag file after adding signal listener */
+  probe_init_done();
+
   /* Connect D-Bus to the mainloop */
   dbus_connection_setup_with_g_main(dbus_connection_sys, NULL);
 

src/usb_moded.c

@@ -150,7 +150,6 @@ static gboolean set_disconnected_silent(gpointer data);
 static void usb_moded_init(void);
 static gboolean charging_fallback(gpointer data);
 static void usage(void);
-static bool init_done_p(void);
 
 /* ============= Implementation starts here =========================================== */
 /** set the usb connection status 
@@ -1192,13 +1191,35 @@ void delay_suspend(void)
 					 allow_suspend_cb, 0);
 }
 
+/** Path to init-done flag file */
+static const char init_done_flagfile[] = "/run/systemd/boot-status/init-done";
+
+/** cached init-done-reached state */
+static bool init_done_reached = false;
+
 /** Check if system has already been successfully booted up
  *
  * @return true if init-done has been reached, or false otherwise
  */
-static bool init_done_p(void)
+bool init_done_p(void)
+{
+	return init_done_reached;
+}
+
+/** Update cached init-done-reached state */
+void set_init_done(bool reached)
 {
-	return access("/run/systemd/boot-status/init-done", F_OK) == 0;
+	if( init_done_reached != reached ) {
+		init_done_reached = reached;
+		log_debug("init_done -> %s",
+			  init_done_reached ? "reached" : "not reached");
+	}
+}
+
+/** Check whether init-done flag file exists */
+void probe_init_done(void)
+{
+	set_init_done(access(init_done_flagfile, F_OK) == 0);
 }
 
 /** Request orderly exit from mainloop
@@ -1394,6 +1415,9 @@ int main(int argc, char* argv[])
 	g_thread_init(NULL);
 #endif
 
+	/* Check if we are in mid-bootup */
+	probe_init_done();
+
 	/* Must be the 1st libdbus call that is made */
 	dbus_threads_init_default();
 

src/usb_moded.h

@@ -25,6 +25,7 @@
 #define USB_MODED_H_
 
 #include <stdlib.h>
+#include <stdbool.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <string.h>
@@ -103,4 +104,8 @@ void usb_moded_usleep_(const char *file, int line, const char *func, useconds_t
 #define usb_moded_msleep(msec)    usb_moded_usleep_(__FILE__,__LINE__,__FUNCTION__,(msec)*1000)
 #define usb_moded_sleep(sec)      usb_moded_usleep_(__FILE__,__LINE__,__FUNCTION__,(sec)*1000000)
 
+bool init_done_p(void);
+void set_init_done(bool reached);
+void probe_init_done(void);
+
 #endif /* USB_MODED_H */