input_plugin: method init() returns errors with GError

Not used by any plugin currently, but this eliminates the g_error()
call in input_plugin_config(), so it's worth it.

4 files changed, 45 insertions, 10 deletions

diff --git a/src/input/curl_input_plugin.c b/src/input/curl_input_plugin.c
index 49defc7fe..69b19c371 100644
--- a/src/input/curl_input_plugin.c
+++ b/src/input/curl_input_plugin.c
@@ -104,7 +104,8 @@ static const char *proxy, *proxy_user, *proxy_password;
 static unsigned proxy_port;
 
 static bool
-input_curl_init(const struct config_param *param)
+input_curl_init(const struct config_param *param,
+		G_GNUC_UNUSED GError **error_r)
 {
 	CURLcode code = curl_global_init(CURL_GLOBAL_ALL);
 	if (code != CURLE_OK) {
diff --git a/src/input_init.c b/src/input_init.c
index 5f45de5c7..c4d015594 100644
--- a/src/input_init.c
+++ b/src/input_init.c
@@ -22,9 +22,16 @@
 #include "input_plugin.h"
 #include "input_registry.h"
 #include "conf.h"
+#include "glib_compat.h"
 
 #include <string.h>
 
+static inline GQuark
+input_quark(void)
+{
+	return g_quark_from_static_string("input");
+}
+
 /**
  * Find the "input" configuration block for the specified plugin.
  *
@@ -32,16 +39,19 @@
  * @return the configuration block, or NULL if none was configured
  */
 static const struct config_param *
-input_plugin_config(const char *plugin_name)
+input_plugin_config(const char *plugin_name, GError **error_r)
 {
 	const struct config_param *param = NULL;
 
 	while ((param = config_get_next_param(CONF_INPUT, param)) != NULL) {
 		const char *name =
 			config_get_block_string(param, "plugin", NULL);
-		if (name == NULL)
-			g_error("input configuration without 'plugin' name in line %d",
-				param->line);
+		if (name == NULL) {
+			g_set_error(error_r, input_quark(), 0,
+				    "input configuration without 'plugin' name in line %d",
+				    param->line);
+			return NULL;
+		}
 
 		if (strcmp(name, plugin_name) == 0)
 			return param;
@@ -50,20 +60,35 @@ input_plugin_config(const char *plugin_name)
 	return NULL;
 }
 
-void input_stream_global_init(void)
+bool
+input_stream_global_init(GError **error_r)
 {
+	GError *error = NULL;
+
 	for (unsigned i = 0; input_plugins[i] != NULL; ++i) {
 		const struct input_plugin *plugin = input_plugins[i];
 		const struct config_param *param =
-			input_plugin_config(plugin->name);
+			input_plugin_config(plugin->name, &error);
+		if (param == NULL && error != NULL) {
+			g_propagate_error(error_r, error);
+			return false;
+		}
 
 		if (!config_get_block_bool(param, "enabled", true))
 			/* the plugin is disabled in mpd.conf */
 			continue;
 
-		if (plugin->init == NULL || plugin->init(param))
+		if (plugin->init == NULL || plugin->init(param, &error))
 			input_plugins_enabled[i] = true;
+		else {
+			g_propagate_prefixed_error(error_r, error,
+						   "Failed to initialize input plugin '%s': ",
+						   plugin->name);
+			return false;
+		}
 	}
+
+	return true;
 }
 
 void input_stream_global_finish(void)
diff --git a/src/input_init.h b/src/input_init.h
index 6266a84fb..8416de59e 100644
--- a/src/input_init.h
+++ b/src/input_init.h
@@ -22,10 +22,17 @@
 
 #include "check.h"
 
+#include <glib.h>
+#include <stdbool.h>
+
 /**
  * Initializes this library and all input_stream implementations.
+ *
+ * @param error_r location to store the error occuring, or NULL to
+ * ignore errors
  */
-void input_stream_global_init(void);
+bool
+input_stream_global_init(GError **error_r);
 
 /**
  * Deinitializes this library and all input_stream implementations.
diff --git a/src/input_plugin.h b/src/input_plugin.h
index f38174d42..b0ba37959 100644
--- a/src/input_plugin.h
+++ b/src/input_plugin.h
@@ -35,10 +35,12 @@ struct input_plugin {
 	/**
 	 * Global initialization.  This method is called when MPD starts.
 	 *
+	 * @param error_r location to store the error occuring, or
+	 * NULL to ignore errors
 	 * @return true on success, false if the plugin should be
 	 * disabled
 	 */
-	bool (*init)(const struct config_param *param);
+	bool (*init)(const struct config_param *param, GError **error_r);
 
 	/**
 	 * Global deinitialization.  Called once before MPD shuts