- add --enable-pkg-management configure switch; default=no

Conflicts:
	src/gui/Makefile.am
	src/gui/update_settings.cpp
	src/neutrino.cpp

Signed-off-by: Thilo Graf <dbt@novatux.de>

Added vanhofens flash update check.
Reason: build was broken and makes maintenance easier.

src/gui/update_check.cpp

@@ -0,0 +1,115 @@
+/*
+	update-check
+
+	Copyright (C) 2017 'vanhofen'
+	Homepage: http://www.neutrino-images.de/
+
+	License: GPL
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the Free Software
+	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <pthread.h>
+#include <unistd.h>
+
+#include <global.h>
+#include <neutrino.h>
+
+#include <system/set_threadname.h>
+#include <gui/update.h>
+
+#include "update_check.h"
+
+#define C4U_SLEEP (6 * 60 * 60) // 6 hours
+#define C4U_FLAGFILE FLAGDIR "/.update"
+
+/* ----------------------------------------------------------------- */
+
+CFlashUpdateCheck::CFlashUpdateCheck()
+{
+	c4u_thread = 0;
+}
+
+CFlashUpdateCheck::~CFlashUpdateCheck()
+{
+	stopThread();
+}
+
+CFlashUpdateCheck* CFlashUpdateCheck::getInstance()
+{
+	static CFlashUpdateCheck * c4u = NULL;
+	if (!c4u)
+		c4u = new CFlashUpdateCheck();
+
+	return c4u;
+}
+
+void CFlashUpdateCheck::startThread()
+{
+	if (!c4u_thread)
+	{
+		printf("[CFlashUpdateCheck]: starting thread\n");
+		pthread_create(&c4u_thread, NULL, c4u_proc, (void*) NULL);
+		pthread_detach(c4u_thread);
+	}
+}
+
+void CFlashUpdateCheck::stopThread()
+{
+	if (c4u_thread)
+	{
+		printf("[CFlashUpdateCheck]: stopping thread\n");
+		pthread_cancel(c4u_thread);
+	}
+	c4u_thread = 0;
+
+	if (access(C4U_FLAGFILE, F_OK) == 0)
+		unlink(C4U_FLAGFILE);
+}
+
+void* CFlashUpdateCheck::c4u_proc(void*)
+{
+	set_threadname("n:flashupdatecheck");
+
+	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, 0);
+	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);
+
+	CFlashUpdate flashupdate;
+
+	//printf("[CFlashUpdateCheck] %s: starting loop\n", __FUNCTION__);
+	while(1)
+	{
+		//printf("[CFlashUpdateCheck]: check for updates\n");
+		if (flashupdate.checkOnlineVersion())
+		{
+			//printf("[CFlashUpdateCheck]: update available\n");
+			if (FILE *f = fopen(C4U_FLAGFILE, "w"))
+				fclose(f);
+		}
+		else
+		{
+			if (access(C4U_FLAGFILE, F_OK) == 0)
+				unlink(C4U_FLAGFILE);
+		}
+
+		sleep(C4U_SLEEP);
+	}
+	return 0;
+}