cmdline: handle fatal errors with GError

Don't call g_error(), which will abort the process and dump core.

src/cmdline.c

@@ -38,6 +38,12 @@
 #define USER_CONFIG_FILE_LOCATION1	".mpdconf"
 #define USER_CONFIG_FILE_LOCATION2	".mpd/mpd.conf"
 
+static GQuark
+cmdline_quark(void)
+{
+	return g_quark_from_static_string("cmdline");
+}
+
 G_GNUC_NORETURN
 static void version(void)
 {
@@ -76,7 +82,9 @@ static const char *summary =
 	"Music Player Daemon - a daemon for playing music.";
 #endif
 
-void parse_cmdline(int argc, char **argv, struct options *options)
+bool
+parse_cmdline(int argc, char **argv, struct options *options,
+	      GError **error_r)
 {
 	GError *error = NULL;
 	GOptionContext *context;
@@ -133,6 +141,7 @@ void parse_cmdline(int argc, char **argv, struct options *options)
 
 	if (option_no_config) {
 		g_debug("Ignoring config, using daemon defaults\n");
+		return true;
 	} else if (argc <= 1) {
 		/* default configuration file path */
 		char *path1;
@@ -151,9 +160,16 @@ void parse_cmdline(int argc, char **argv, struct options *options)
 			config_read_file(SYSTEM_CONFIG_FILE_LOCATION);
 		g_free(path1);
 		g_free(path2);
+
+		return true;
 	} else if (argc == 2) {
 		/* specified configuration file */
 		config_read_file(argv[1]);
-	} else
+
-		g_error("too many arguments");
+		return true;
+	} else {
+		g_set_error(error_r, cmdline_quark(), 0,
+			    "too many arguments");
+		return false;
+	}
 }

src/cmdline.h

@@ -22,6 +22,8 @@
 
 #include <glib.h>
 
+#include <stdbool.h>
+
 struct options {
 	gboolean kill;
 	gboolean daemon;
@@ -29,6 +31,8 @@ struct options {
 	gboolean verbose;
 };
 
-void parse_cmdline(int argc, char **argv, struct options *options);
+bool
+parse_cmdline(int argc, char **argv, struct options *options,
+	      GError **error_r);
 
 #endif

src/main.c

@@ -295,7 +295,12 @@ int main(int argc, char *argv[])
 	tag_pool_init();
 	config_global_init();
 
-	parse_cmdline(argc, argv, &options);
+	success = parse_cmdline(argc, argv, &options, &error);
+	if (!success) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
 
 	glue_daemonize_init(&options);