Introduce CLI

main: Parse args using getopt_long() in main().

Begin implementation of a CLI. It can be launched
using ./qswiki config --cli.

Allow connecting to another instance using "attach" command.
This uses Unix domain sockets, and in the future can be used
to drop caches, reload template, etc.

Closes: #21

qswiki.cpp

@@ -25,6 +25,7 @@ SOFTWARE.
 #include <unistd.h>
 #include <sys/types.h>
 #include <filesystem>
+#include <getopt.h>
 #include "gateway/gatewayinterface.h"
 #include "gateway/gatewayfactory.h"
 #include "handlers/handlerfactory.h"
@@ -37,6 +38,10 @@ SOFTWARE.
 #include "requestworker.h"
 #include "cache/fscache.h"
 #include "sandbox/sandboxfactory.h"
+#include "cli.h"
+#include "cliconsole.h"
+#include "cliserver.h"
+
 void sigterm_handler(int arg)
 {
 	// TODO: proper shutdown.
@@ -56,6 +61,10 @@ void setup_signal_handlers()
 	}
 }
 
+#define OPT_PRINT_VERSION 23
+
+static struct option long_options[] = {{"cli", no_argument, 0, 'c'}, {"version", no_argument, 0, OPT_PRINT_VERSION}};
+
 std::unique_ptr<ICache> createCache(const ConfigVariableResolver &resolver)
 {
 
@@ -63,13 +72,48 @@ std::unique_ptr<ICache> createCache(const ConfigVariableResolver &resolver)
 
 	return std::make_unique<FsCache>(path);
 }
+
+std::string get_version_string()
+{
+	return "master";
+}
+
 int main(int argc, char **argv)
 {
+
+	char *configfilepath = NULL;
+	int option;
+	int option_index;
+	bool cli_mode = false;
+
 	if(geteuid() == 0)
 	{
 		std::cerr << "Do not run this as root!" << std::endl;
 		return 1;
 	}
+
+	while((option = getopt_long(argc, argv, "cv", long_options, &option_index)) != -1)
+	{
+		switch(option)
+		{
+		case 'c':
+			cli_mode = true;
+			break;
+		case OPT_PRINT_VERSION:
+			std::cout << get_version_string() << std::endl;
+			exit(EXIT_SUCCESS);
+			break;
+		}
+	}
+
+	if(optind == argc)
+	{
+		std::cerr << "Missing config path" << std::endl;
+		return 1;
+	}
+
+	configfilepath = argv[optind++];
+
 	auto sandbox = createSandbox();
 	// TODO: do we want to keep it mandatory or configurable?
 	if(!sandbox->supported())
@@ -82,7 +126,7 @@ int main(int argc, char **argv)
 		std::cerr << "no path to config file provided" << std::endl;
 		return 1;
 	}
-	std::string configpath = std::filesystem::absolute(argv[1]).string();
+	std::string configpath = std::filesystem::absolute(configfilepath).string();
 	if(!sandbox->enableForInit())
 	{
 		Logger::error() << "Sandboxing for init mode could not be activated.";
@@ -113,6 +157,21 @@ int main(int argc, char **argv)
 		Logger::setStream(&logstream);
 
 		auto database = createDatabase(config);
+		std::string socketPath = config.configVarResolver.getConfig("socketpath");
+		CLIHandler cliHandler(config, *database);
+
+		if(cli_mode)
+		{
+			CLIConsole console{cliHandler, socketPath};
+			console.startInteractive();
+			return 0;
+		}
+		CLIServer cliServer{cliHandler};
+		if(!cliServer.detachServer(socketPath))
+		{
+			Logger::error() << "Error: Failed to detach unix socket server";
+			return 1;
+		}
 
 		// TODO: quite ugly, anon-handling must be rethought
 		auto userdao = database->createUserDao();