daemon: add support for properties in the config file

Make a set-prop command to set a property from the config file
into a pw_properties. Pass this to the pw_core_new() and the
main-loop to tweak some stuff.

Move some warns to errors

src/daemon/command.c

@@ -37,16 +37,17 @@
 
 /** \cond */
 
-static struct pw_command *parse_command_help(const char *line, char **err);
-static struct pw_command *parse_command_add_spa_lib(const char *line, char **err);
-static struct pw_command *parse_command_module_load(const char *line, char **err);
-static struct pw_command *parse_command_exec(const char *line, char **err);
+static struct pw_command *parse_command_help(struct pw_properties *properties, const char *line, char **err);
+static struct pw_command *parse_command_set_prop(struct pw_properties *properties, const char *line, char **err);
+static struct pw_command *parse_command_add_spa_lib(struct pw_properties *properties, const char *line, char **err);
+static struct pw_command *parse_command_module_load(struct pw_properties *properties, const char *line, char **err);
+static struct pw_command *parse_command_exec(struct pw_properties *properties, const char *line, char **err);
 
 struct impl {
 	struct pw_command this;
 };
 
-typedef struct pw_command *(*pw_command_parse_func_t) (const char *line, char **err);
+typedef struct pw_command *(*pw_command_parse_func_t) (struct pw_properties *properties, const char *line, char **err);
 
 struct command_parse {
 	const char *name;
@@ -56,6 +57,7 @@ struct command_parse {
 
 static const struct command_parse parsers[] = {
 	{"help", "Show this help", parse_command_help},
+	{"set-prop", "Set a property", parse_command_set_prop},
 	{"add-spa-lib", "Add a library that provides a spa factory name regex", parse_command_add_spa_lib},
 	{"load-module", "Load a module", parse_command_module_load},
 	{"exec", "Execute a program", parse_command_exec},
@@ -77,7 +79,7 @@ execute_command_help(struct pw_command *command, struct pw_core *core, char **er
 	return 0;
 }
 
-static struct pw_command *parse_command_help(const char *line, char **err)
+static struct pw_command *parse_command_help(struct pw_properties *properties, const char *line, char **err)
 {
 	struct impl *impl;
 	struct pw_command *this;
@@ -97,6 +99,42 @@ no_mem:
 	return NULL;
 }
 
+static int
+execute_command_set_prop(struct pw_command *command, struct pw_core *core, char **err)
+{
+	return 0;
+}
+
+static struct pw_command *parse_command_set_prop(struct pw_properties *properties, const char *line, char **err)
+{
+	struct impl *impl;
+	struct pw_command *this;
+
+	impl = calloc(1, sizeof(struct impl));
+	if (impl == NULL)
+		goto error_alloc;
+
+	this = &impl->this;
+	this->func = execute_command_set_prop;
+	this->args = pw_split_strv(line, whitespace, 4, &this->n_args);
+
+	if (this->n_args < 3)
+		goto error_arguments;
+
+	pw_log_debug("set property: '%s' = '%s'", this->args[1], this->args[2]);
+	pw_properties_set(properties, this->args[1], this->args[2]);
+
+	return this;
+
+error_arguments:
+	asprintf(err, "%s requires <property-name> <value>", this->args[0]);
+	pw_free_strv(this->args);
+	return NULL;
+error_alloc:
+	asprintf(err, "alloc failed: %m");
+	return NULL;
+}
+
 static int
 execute_command_add_spa_lib(struct pw_command *command, struct pw_core *core, char **err)
 {
@@ -110,7 +148,7 @@ execute_command_add_spa_lib(struct pw_command *command, struct pw_core *core, ch
 	return 0;
 }
 
-static struct pw_command *parse_command_add_spa_lib(const char *line, char **err)
+static struct pw_command *parse_command_add_spa_lib(struct pw_properties *properties, const char *line, char **err)
 {
 	struct impl *impl;
 	struct pw_command *this;
@@ -150,7 +188,7 @@ execute_command_module_load(struct pw_command *command, struct pw_core *core, ch
 	return 0;
 }
 
-static struct pw_command *parse_command_module_load(const char *line, char **err)
+static struct pw_command *parse_command_module_load(struct pw_properties *properties, const char *line, char **err)
 {
 	struct impl *impl;
 	struct pw_command *this;
@@ -194,7 +232,7 @@ execute_command_exec(struct pw_command *command, struct pw_core *core, char **er
 	return 0;
 }
 
-static struct pw_command *parse_command_exec(const char *line, char **err)
+static struct pw_command *parse_command_exec(struct pw_properties *properties, const char *line, char **err)
 {
 	struct impl *impl;
 	struct pw_command *this;
@@ -250,7 +288,7 @@ void pw_command_free(struct pw_command *command)
  * \memberof pw_command
  */
 SPA_EXPORT
-struct pw_command *pw_command_parse(const char *line, char **err)
+struct pw_command *pw_command_parse(struct pw_properties *properties, const char *line, char **err)
 {
 	struct pw_command *command = NULL;
 	const struct command_parse *parse;
@@ -263,7 +301,7 @@ struct pw_command *pw_command_parse(const char *line, char **err)
 
 	for (parse = parsers; parse->name != NULL; parse++) {
 		if (strcmp(name, parse->name) == 0) {
-			command = parse->func(line, err);
+			command = parse->func(properties, line, err);
 			goto out;
 		}
 	}

src/daemon/command.h

@@ -30,17 +30,26 @@
 extern "C" {
 #endif
 
+#include <pipewire/core.h>
+
+struct pw_command;
+
+typedef int (*pw_command_func_t) (struct pw_command *command, struct pw_core *core, char **err);
+
 /** \class pw_command
  *
  * A configuration command
  */
-struct pw_command;
-
-#include <pipewire/core.h>
-
+struct pw_command {
+	struct spa_list link;	/**< link in list of commands */
+	pw_command_func_t func;
+	char **args;
+	uint32_t id;		/**< id of command */
+	int n_args;
+};
 
 struct pw_command *
-pw_command_parse(const char *line, char **err);
+pw_command_parse(struct pw_properties *properties, const char *line, char **err);
 
 void
 pw_command_free(struct pw_command *command);

src/daemon/daemon-config.c

@@ -32,9 +32,9 @@
 #include <errno.h>
 
 #include <pipewire/pipewire.h>
-#include <pipewire/command.h>
 #include <pipewire/private.h>
 
+#include "daemon/command.h"
 #include "daemon/daemon-config.h"
 
 #define DEFAULT_CONFIG_FILE PIPEWIRE_CONFIG_DIR "/pipewire.conf"
@@ -45,7 +45,6 @@ parse_line(struct pw_daemon_config *config,
 {
 	struct pw_command *command = NULL;
 	char *p;
-	int ret = 0;
 	char *local_err = NULL;
 
 	/* search for comments */
@@ -55,17 +54,20 @@ parse_line(struct pw_daemon_config *config,
 	/* remove whitespaces */
 	line = pw_strip(line, "\n\r \t");
 	if (*line == '\0')	/* empty line */
-		return 0;
+		goto out;
 
-	if ((command = pw_command_parse(line, &local_err)) == NULL) {
-		asprintf(err, "%s:%u: %s", filename, lineno, local_err);
-		free(local_err);
-		ret = -EINVAL;
-	} else {
-		spa_list_append(&config->commands, &command->link);
-	}
+	if ((command = pw_command_parse(config->properties, line, &local_err)) == NULL)
+		goto error_parse;
 
-	return ret;
+	spa_list_append(&config->commands, &command->link);
+
+out:
+	return 0;
+
+error_parse:
+	asprintf(err, "%s:%u: %s", filename, lineno, local_err);
+	free(local_err);
+	return -EINVAL;
 }
 
 /**
@@ -73,14 +75,21 @@ parse_line(struct pw_daemon_config *config,
  *
  * Returns a new empty #struct pw_daemon_config.
  */
-struct pw_daemon_config *pw_daemon_config_new(void)
+struct pw_daemon_config *pw_daemon_config_new(struct pw_properties *properties)
 {
 	struct pw_daemon_config *config;
 
 	config = calloc(1, sizeof(struct pw_daemon_config));
+	if (config == NULL)
+		goto error_exit;
+
+	config->properties = properties;
 	spa_list_init(&config->commands);
 
 	return config;
+
+error_exit:
+	return NULL;
 }
 
 /**

src/daemon/daemon-config.h

@@ -34,9 +34,10 @@ extern "C" {
 
 struct pw_daemon_config {
 	struct spa_list commands;
+	struct pw_properties *properties;
 };
 
-struct pw_daemon_config * pw_daemon_config_new(void);
+struct pw_daemon_config * pw_daemon_config_new(struct pw_properties *properties);
 
 void pw_daemon_config_free(struct pw_daemon_config *config);
 

src/daemon/main.c

@@ -55,6 +55,7 @@ int main(int argc, char *argv[])
 	struct pw_core *core;
 	struct pw_main_loop *loop;
 	struct pw_daemon_config *config;
+	struct pw_properties *properties;
 	char *err = NULL;
 	static const struct option long_options[] = {
 		{"help",	0, NULL, 'h'},
@@ -88,8 +89,12 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	properties = pw_properties_new(
+                                PW_KEY_CORE_NAME, daemon_name,
+                                PW_KEY_CORE_DAEMON, "1", NULL);
+
 	/* parse configuration */
-	config = pw_daemon_config_new();
+	config = pw_daemon_config_new(properties);
 	if (pw_daemon_config_load(config, &err) < 0) {
 		pw_log_error("failed to parse config: %s", err);
 		free(err);
@@ -97,15 +102,17 @@ int main(int argc, char *argv[])
 	}
 
 
-	loop = pw_main_loop_new(NULL);
+	loop = pw_main_loop_new(pw_properties_copy(properties));
+	if (loop == NULL) {
+		pw_log_error("failed to create main-loop: %m");
+		return -1;
+	}
+
 	pw_loop_add_signal(pw_main_loop_get_loop(loop), SIGINT, do_quit, loop);
 	pw_loop_add_signal(pw_main_loop_get_loop(loop), SIGTERM, do_quit, loop);
 
 	core = pw_core_new(pw_main_loop_get_loop(loop),
-			pw_properties_new(
-				PW_KEY_CORE_NAME, daemon_name,
-				PW_KEY_CORE_DAEMON, "1", NULL),
-			0);
+			properties, 0);
 
 	if (core == NULL) {
 		pw_log_error("failed to create core: %m");

src/daemon/pipewire.conf.in

@@ -1,5 +1,7 @@
 #daemon config file for PipeWire version @VERSION@
 
+#set-prop library.name.system			support/libspa-support
+#set-prop core.data-loop.library.name.system	support/libspa-support
 
 add-spa-lib api.alsa.* alsa/libspa-alsa
 add-spa-lib api.v4l2.* v4l2/libspa-v4l2