Linux: Use config file for gateway settings (#1061)

- The following settings can be use on the config file:
  - verbose=[debug,info,notice,warn,err] - Logging verbosity.
  - log_file[0|1] - Enable logging to a file.
  - log_filepath=(FILE) - Log file path.
  - log_pipe=[0|1] - Enable logging to a named pipe(aka fifo).
    Use this option to view your gateway's log messages from the
    log_pipe_file (defined below).
    To do so, run the following command on another terminal:
    - $ cat "log_pipe_file"
  - log_pipe_file=(FILE)
  - syslog=[0|1] - Enable logging to syslog.
  - eeprom_file=[/etc/mysensors.eeprom]
  - eeprom_size=[1024]
- Change some mysgw parameters:
  - Added:
    - -q, --quiet:  for quiet mode, disable log messages written to the
    terminal.
  - Removed:
    - -d, --debug: removed, log messages are now enabled by default.
  - Replaced:
    - -b, --background: replaced by --daemon
- isatty() is no longer used, log messages by default are printed to
  stderr unless the gateway is started with --quiet (#1022)
- MY_LINUX_CONFIG_FILE: no longer holds the path to the eeprom file,
  but to the configuration file

MyConfig.h

@@ -1873,7 +1873,7 @@
  * @note For now the configuration file is only used to store the emulated eeprom state.
  */
 #ifndef MY_LINUX_CONFIG_FILE
-#define MY_LINUX_CONFIG_FILE "/etc/mysensors.dat"
+#define MY_LINUX_CONFIG_FILE "/etc/mysensors.conf"
 #endif
 /** @}*/ // End of LinuxSettingGrpPub group
 /** @}*/ // End of PlatformSettingGrpPub group

configure

@@ -37,7 +37,7 @@ Installation options:
 
 MySensors options:
     --my-debug=[enable|disable] Enables or disables MySensors core debugging. [enable]
-    --my-config-file=<FILE>     Config file path. [/etc/mysensors.dat]
+    --my-config-file=<FILE>     Config file path. [/etc/mysensors.conf]
     --my-gateway=[none|ethernet|serial|mqtt]
                                 Set the protocol used to communicate with the controller. [ethernet]
     --my-node-id=<ID>           Disable gateway feature and run as a node with the specified id.

drivers/Linux/SoftEeprom.cpp

@@ -6,7 +6,7 @@
  * network topology allowing messages to be routed to nodes.
  *
  * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
- * Copyright (C) 2013-2017 Sensnology AB
+ * Copyright (C) 2013-2018 Sensnology AB
  * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
  *
  * Documentation: http://www.mysensors.org
@@ -26,14 +26,36 @@
 #include "log.h"
 #include "SoftEeprom.h"
 
-SoftEeprom::SoftEeprom(const char *fileName, size_t length)
+SoftEeprom::SoftEeprom() : _length(0), _fileName(NULL), _values(NULL)
+{
+}
+
+SoftEeprom::SoftEeprom(const SoftEeprom& other)
+{
+	_fileName = strdup(other._fileName);
+
+	_length = other._length;
+	_values = new uint8_t[_length];
+	for (size_t i = 0; i < _length; ++i) {
+		_values[i] = other._values[i];
+	}
+}
+
+SoftEeprom::~SoftEeprom()
+{
+	destroy();
+}
+
+int SoftEeprom::init(const char *fileName, size_t length)
 {
 	struct stat fileInfo;
 
+	destroy();
+
 	_fileName = strdup(fileName);
 	if (_fileName == NULL) {
 		logError("Error: %s\n", strerror(errno));
-		exit(1);
+		return -1;
 	}
 
 	_length = length;
@@ -44,53 +66,48 @@ SoftEeprom::SoftEeprom(const char *fileName, size_t length)
 
 	if (stat(_fileName, &fileInfo) != 0) {
 		//File does not exist.  Create it.
-		logInfo("Config file %s does not exist, creating new config file.\n", _fileName);
+		logInfo("EEPROM file %s does not exist, creating new file.\n", _fileName);
 		std::ofstream myFile(_fileName, std::ios::out | std::ios::binary);
 		if (!myFile) {
 			logError("Unable to create config file %s.\n", _fileName);
-			exit(1);
+			return -1;
 		}
 		myFile.write((const char*)_values, _length);
 		myFile.close();
 	} else if (fileInfo.st_size < 0 || (size_t)fileInfo.st_size != _length) {
-		logError("Config file %s is not the correct size of %zu.  Please remove the file and a new one will be created.\n",
+		logError("EEPROM file %s is not the correct size of %zu.  Please remove the file and a new one will be created.\n",
 		         _fileName, _length);
-		exit(1);
+		return -1;
 	} else {
 		//Read config into local memory.
 		std::ifstream myFile(_fileName, std::ios::in | std::ios::binary);
 		if (!myFile) {
-			logError("Unable to open config to file %s for reading.\n", _fileName);
-			exit(1);
+			logError("Unable to open EEPROM file %s for reading.\n", _fileName);
+			return -1;
 		}
 		myFile.read((char*)_values, _length);
 		myFile.close();
 	}
-}
-
-SoftEeprom::SoftEeprom(const SoftEeprom& other)
-{
-	_fileName = strdup(other._fileName);
 
-	_length = other._length;
-	_values = new uint8_t[_length];
-	for (size_t i = 0; i < _length; ++i) {
-		_values[i] = other._values[i];
-	}
+	return 0;
 }
 
-SoftEeprom::~SoftEeprom()
+void SoftEeprom::destroy()
 {
-	delete[] _values;
-	free(_fileName);
+	if (_values) {
+		delete[] _values;
+	}
+	if (_fileName) {
+		free(_fileName);
+	}
 }
 
 void SoftEeprom::readBlock(void* buf, void* addr, size_t length)
 {
 	static bool config_to_mem = false;
 	unsigned long int offs = reinterpret_cast<unsigned long int>(addr);
 
-	if (!config_to_mem) {
+	if (!config_to_mem && length) {
 		//Read config into local memory.
 		std::ifstream myFile(_fileName, std::ios::in | std::ios::binary);
 		if (!myFile) {
@@ -144,6 +161,9 @@ void SoftEeprom::writeByte(int addr, uint8_t value)
 SoftEeprom& SoftEeprom::operator=(const SoftEeprom& other)
 {
 	if (this != &other) {
+		delete[] _values;
+		free(_fileName);
+
 		_fileName = strdup(other._fileName);
 
 		_length = other._length;

drivers/Linux/SoftEeprom.h

@@ -6,7 +6,7 @@
  * network topology allowing messages to be routed to nodes.
  *
  * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
- * Copyright (C) 2013-2017 Sensnology AB
+ * Copyright (C) 2013-2018 Sensnology AB
  * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
  *
  * Documentation: http://www.mysensors.org
@@ -37,7 +37,7 @@ class SoftEeprom
 	/**
 	 * @brief SoftEeprom constructor.
 	 */
-	SoftEeprom(const char *fileName, size_t length);
+	SoftEeprom();
 	/**
 	 * @brief SoftEeprom copy constructor.
 	 */
@@ -46,6 +46,19 @@ class SoftEeprom
 	 * @brief SoftEeprom destructor.
 	 */
 	~SoftEeprom();
+	/**
+	 * @brief Initializes the eeprom class.
+	 *
+	 * @param fileName filepath where the data is saved.
+	 * @param length eeprom size in bytes.
+	 * @return 0 if SUCCESS or -1 if FAILURE.
+	 */
+	int init(const char *fileName, size_t length);
+	/**
+	 * @brief Clear all allocated memory variables.
+	 *
+	 */
+	void destroy();
 	/**
 	 * @brief Read a block of bytes from eeprom.
 	 *