pulse-server: add a pulse.cmd section

Add a new config section that can contain a set of commands to run after
starting.

There is only load-module available now but it can be used to remove the
dependency on pactl when starting the server.

src/modules/module-protocol-pulse/cmd.c

@@ -0,0 +1,136 @@
+/* PipeWire
+ *
+ * Copyright © 2022 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <spa/utils/json.h>
+
+#include <pipewire/utils.h>
+
+#include "module.h"
+#include "cmd.h"
+
+static const char WHITESPACE[] = " \t\n\r";
+
+static int do_load_module(struct impl *impl, char *args, const char *flags)
+{
+	int res, n;
+	struct module *module;
+	char *a[2] = { NULL };
+
+	n = pw_split_ip(args, WHITESPACE, 2, a);
+	if (n < 1) {
+		pw_log_info("load-module expects module name");
+		return -EINVAL;
+	}
+
+	module = module_create(impl, a[0], a[1]);
+	if (module == NULL)
+		return -errno;
+	if ((res = module_load(module)) < 0)
+		return res;
+
+	return res;
+}
+
+static int do_cmd(struct impl *impl, const char *cmd, char *args, const char *flags)
+{
+	int res = 0;
+	if (spa_streq(cmd, "load-module")) {
+		res = do_load_module(impl, args, flags);
+	} else {
+		pw_log_warn("ignoring unknown command `%s` with args `%s`",
+				cmd, args);
+	}
+	if (res < 0) {
+		if (flags && strstr(flags, "nofail")) {
+			pw_log_info("nofail command %s %s: %s",
+					cmd, args, spa_strerror(res));
+			res = 0;
+		} else {
+			pw_log_error("can't run command %s %s: %s",
+					cmd, args, spa_strerror(res));
+		}
+	}
+	return res;
+}
+
+/*
+ * pulse.cmd = [
+ *   { cmd = <command> [ args = "<arguments>" ] }
+ *   ...
+ * ]
+ */
+static int parse_cmd(void *user_data, const char *location,
+		const char *section, const char *str, size_t len)
+{
+	struct impl *impl = user_data;
+	struct spa_json it[3];
+	char key[512], *s;
+	int res = 0;
+
+	s = strndup(str, len);
+	spa_json_init(&it[0], s, len);
+	if (spa_json_enter_array(&it[0], &it[1]) < 0) {
+		pw_log_error("config file error: pulse.cmd is not an array");
+		res = -EINVAL;
+		goto exit;
+	}
+
+	while (spa_json_enter_object(&it[1], &it[2]) > 0) {
+		char *cmd = NULL, *args = NULL, *flags = NULL;
+
+		while (spa_json_get_string(&it[2], key, sizeof(key)) > 0) {
+			const char *val;
+			int len;
+
+			if ((len = spa_json_next(&it[2], &val)) <= 0)
+				break;
+
+			if (spa_streq(key, "cmd")) {
+				cmd = (char*)val;
+				spa_json_parse_stringn(val, len, cmd, len+1);
+			} else if (spa_streq(key, "args")) {
+				args = (char*)val;
+				spa_json_parse_stringn(val, len, args, len+1);
+			} else if (spa_streq(key, "flags")) {
+				if (spa_json_is_container(val, len))
+					len = spa_json_container_len(&it[2], val, len);
+				flags = (char*)val;
+				spa_json_parse_stringn(val, len, flags, len+1);
+			}
+		}
+		if (cmd != NULL)
+			res = do_cmd(impl, cmd, args, flags);
+		if (res < 0)
+			break;
+	}
+exit:
+	free(s);
+	return res;
+}
+
+int cmd_run(struct impl *impl)
+{
+	return pw_context_conf_section_for_each(impl->context, "pulse.cmd",
+				parse_cmd, impl);
+}