FILE *fp;
	char buffer[256];
	char source_ok[] = "Reading package lists...";
	
	if(0 > system("mv -f /etc/apt/sources.list /etc/apt/sources.list.upgrade"))
		printf("cldUp backup old source list error!\n");
	
	fp=fopen("/etc/apt/sources.list","w+");
	if(0 == fp)
		goto update_done;
	fprintf(fp,"deb http://%s/apt %s %s", source_addr, source_dir, source_ver);
	printf("\ndeb http://%s/apt %s %s\n", source_addr, source_dir, source_ver);
	fclose(fp);
	fp=popen("apt-get update 2>&1","r");
	while(!feof(fp)){
		if(0 == fgets(buffer,sizeof(buffer),fp))
			break;
		printf("%s",buffer);
                fflush(stdout);
		if(strstr(buffer,"Failed")){
			trace_log(buffer);
                        printf("scan failed and exit\n");
		        goto update_done;
		}
	if(strstr(buffer,source_ok)){
			trace_log(buffer);
                        
                        printf("scan sourceok  and exit\n");
			break;
		}
	}
	pclose(fp);

	fp=popen("apt-get -y --force-yes install ssh 2>&1","r");
	while(!feof(fp)){
		if(0 == fgets(buffer,sizeof(buffer),fp))
			break;

		printf("%s",buffer);
                if(strstr(buffer,"1 upgraded")){
                //save the upgrade info 
                b_upgrade_success = true;
		trace_log(buffer);
         
              }
        }
	pclose(fp);
        if(b_upgrade_success)
        {
               b_upgrade_success = 0;
               
        }
update_done:

	if(0 > system("mv -f /etc/apt/sources.list.upgrade /etc/apt/sources.list"))
		printf("restore source list error!\n");