status: Expose migration_seconds_left

src/status.c

@@ -33,6 +33,8 @@ struct status * status_create( struct server * serve )
 		status->migration_duration /= 1000;
 		status->migration_speed = serve->mirror->all_dirty / ( status->migration_duration + 1 );
 		status->migration_speed_limit = serve->mirror->max_bytes_per_second;
+
+		status->migration_seconds_left = server_mirror_eta( serve );
 	}
 
 	server_unlock_start_mirror( serve );
@@ -64,6 +66,7 @@ int status_write( struct status * status, int fd )
 		PRINT_UINT64( pass_clean_bytes );
 		PRINT_UINT64( migration_speed );
 		PRINT_UINT64( migration_duration );
+		PRINT_UINT64( migration_seconds_left );
 		if ( status->migration_speed_limit < UINT64_MAX ) {
 			PRINT_UINT64( migration_speed_limit );
 		};

src/status.h

@@ -46,6 +46,7 @@
  *	If the server is currently in "listen" mode, this will never be
  *	true.
  *
+ *
  * If is_migrating is true, then a number of other attributes may appear,
  * relating to the progress of the migration.
  *
@@ -69,6 +70,10 @@
  *  to send to the destination. Once all the bytes are clean, the migration is
  *  done.
  *
+ * migration_seconds_left:
+ *   Our current best estimate of how many seconds are left before the migration
+ *   migration is finished.
+ *
  */
 
 
@@ -91,6 +96,7 @@ struct status {
 	uint64_t migration_duration;
 	uint64_t migration_speed;
 	uint64_t migration_speed_limit;
+	uint64_t migration_seconds_left;
 };
 
 /** Create a status object for the given server. */