Resolve std.file.FileException when checking logfile path

* Resolve std.file.FileException@std/file.d(2954): /var/log/onedrive/: Permission denied when there is no permission to create the directory on application startup

src/log.d

@@ -7,13 +7,32 @@ import std.algorithm : splitter;
 
 // shared string variable for username
 string username;
+string logFilePath;
 static this() {
 	username = getUserName();
+	logFilePath = "/var/log/onedrive/";
 }
 
 // enable verbose logging
 bool verbose;
 
+void init()
+{
+	if (!exists(logFilePath)){
+		// logfile path does not exist
+		try {
+			mkdirRecurse(logFilePath);
+		} 
+		catch (std.file.FileException e) {
+			// we got an error ..
+			writeln("\nUnable to create /var/log/onedrive/ ");
+			writeln("Please manually create /var/log/onedrive/ and set appropriate permissions to allow write access");
+			writeln("The client activity log will be located in the users home directory\n");
+		}
+	}
+
+}
+
 void log(T...)(T args)
 {
 	writeln(args);
@@ -46,7 +65,7 @@ void error(T...)(T args)
 private void logfileWriteLine(T...)(T args)
 {
 	// Write to log file
-	string logFileName = "/var/log/onedrive/" ~ .username ~ ".onedrive.log";
+	string logFileName = .logFilePath ~ .username ~ ".onedrive.log";
 	auto currentTime = Clock.currTime();
 	auto timeString = currentTime.toString();
 	File logFile;

src/main.d

@@ -6,7 +6,7 @@ static import log;
 
 int main(string[] args)
 {
-	// Determine the user home directory. 
+	// Determine the users configuration directory. 
 	// Need to avoid using ~ here as expandTilde() below does not interpret correctly when running under init.d scripts
 	string configPath = environment.get("XDG_CONFIG_HOME");
 	if (configPath == ""){
@@ -35,8 +35,10 @@ int main(string[] args)
 	bool printVersion;
 	
 	// Additional options added to support MyNAS Storage Appliance
-	// debug the HTTP(S) operations if required
+	// Debug the HTTPS submit operations if required
 	bool debugHttp;
+	// Debug the HTTPS response operations if required
+	bool debugHttpSubmit;
 	// This allows for selective directory syncing instead of everything under ~/OneDrive/
 	string singleDirectory;
 	// Create a single root directory on OneDrive
@@ -102,8 +104,7 @@ int main(string[] args)
 	}
 
 	// Configure Logging
-	string logFilePath = "/var/log/onedrive/";
-	if (!exists(logFilePath)) mkdirRecurse(logFilePath);
+	log.init();
 
 	// load configuration
 	log.vlog("Loading config ...");
@@ -139,6 +140,8 @@ int main(string[] args)
 		log.error("No network connection");
 		return EXIT_FAILURE;
 	}
+	
+	// Initialize OneDrive, check for authorization
 	auto onedrive = new OneDriveApi(cfg, debugHttp);
 	onedrive.printAccessToken = printAccessToken;
 	if (!onedrive.init()) {
@@ -150,10 +153,17 @@ int main(string[] args)
 
 	// if --synchronize or --monitor not passed in, exit & display help
 	auto performSyncOK = false;
+	
 	if (synchronize || monitor) {
 		performSyncOK = true;
 	}
 	
+	// create-directory, remove-directory, source-directory, destination-directory 
+	// are activities that dont perform a sync no error message for these items either
+	if (((createDirectory != "") || (removeDirectory != "")) || ((sourceDirectory != "") && (destinationDirectory != "")) ) {
+		performSyncOK = true;
+	}
+	
 	if (!performSyncOK) {
 		writeln("\n--synchronize or --monitor missing from your command options or use --help for further assistance\n");
 		writeln("No OneDrive sync will be performed without either of these two arguments being present\n");
@@ -171,11 +181,13 @@ int main(string[] args)
 	if (!exists(syncDir)) mkdirRecurse(syncDir);
 	chdir(syncDir);
 	
-	// Initialise the sync engine
-	log.log("Initializing the Synchronization Engine ...");
+	// Configure selective sync by parsing and getting a regex for skip_file config component
 	auto selectiveSync = new SelectiveSync();
 	selectiveSync.load(cfg.syncListFilePath);
 	selectiveSync.setMask(cfg.getValue("skip_file"));
+	
+	// Initialise the sync engine
+	log.log("Initializing the Synchronization Engine ...");
 	auto sync = new SyncEngine(cfg, onedrive, itemdb, selectiveSync);
 	sync.init();