udebug: add new package

This will help with debugging by providing system wide access to per-process
ring buffers with debug data.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/libs/udebug/Makefile

@@ -0,0 +1,82 @@
+#
+# Copyright (C) 2023 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=udebug
+CMAKE_INSTALL:=1
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/udebug.git
+PKG_MIRROR_HASH:=3447dc6edd1b76f7ea5b9650a2aedcab69aba6048fa5ab7b1732cad592651fbc
+PKG_SOURCE_DATE:=2023-11-19
+PKG_SOURCE_VERSION:=44351435e28c6c878bf0a9054cb002704312d60e
+PKG_ABI_VERSION:=$(call abi_version_str,$(PKG_SOURCE_DATE))
+
+PKG_LICENSE:=GPL-2.0
+PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+define Package/libudebug
+  SECTION:=libs
+  CATEGORY:=Libraries
+  TITLE:=udebug client library
+  DEPENDS:=+libubox
+endef
+
+define Package/udebugd
+  SECTION:=utils
+  CATEGORY:=Utilities
+  TITLE:=OpenWrt debug service
+  DEPENDS:=+libudebug +libubus
+endef
+
+define Package/udebugd/conffiles
+/etc/config/udebug
+endef
+
+define Package/ucode-mod-udebug
+  SECTION:=utils
+  CATEGORY:=Utilities
+  TITLE:=ucode udebug module
+  DEPENDS:=+libucode +libudebug
+endef
+
+define Package/udebug-cli
+  SECTION:=utils
+  CATEGORY:=Utilities
+  TITLE:=OpenWrt debug service CLI
+  DEPENDS:=+udebugd +ucode-mod-udebug
+endef
+
+define Package/libudebug/install
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/*.so* $(1)/usr/lib
+endef
+
+define Package/ucode-mod-udebug/install
+	$(INSTALL_DIR) $(1)/usr/lib/ucode
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/ucode/*.so $(1)/usr/lib/ucode
+endef
+
+define Package/udebugd/install
+	$(INSTALL_DIR) $(1)/usr/sbin $(1)/etc/init.d $(1)/etc/config
+	$(INSTALL_BIN) ./files/udebug.config $(1)/etc/config/udebug
+	$(INSTALL_BIN) ./files/udebug.init $(1)/etc/init.d/udebug
+	$(CP) $(PKG_INSTALL_DIR)/usr/sbin/udebugd $(1)/usr/sbin
+endef
+
+define Package/udebug-cli/install
+	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/udebug-cli $(1)/usr/sbin/udebug
+endef
+
+$(eval $(call BuildPackage,libudebug))
+$(eval $(call BuildPackage,udebugd))
+$(eval $(call BuildPackage,ucode-mod-udebug))
+$(eval $(call BuildPackage,udebug-cli))

package/libs/udebug/files/udebug.config

@@ -0,0 +1,4 @@
+config service hostapd
+	option enabled 0
+config service wpa_supplicant
+	option enabled 0

package/libs/udebug/files/udebug.init

@@ -0,0 +1,55 @@
+#!/bin/sh /etc/rc.common
+# Copyright (c) 2021 OpenWrt.org
+
+START=11
+
+USE_PROCD=1
+PROG=/usr/sbin/udebugd
+
+start_service() {
+	procd_open_instance
+	procd_set_param command "$PROG"
+	procd_set_param respawn
+	procd_close_instance
+}
+
+get_vars() {
+	local cfg="$1"
+	uci show "udebug.$cfg" | while read LINE; do
+		cur="${LINE##udebug.$1.}"
+		[[ "$cur" = "$LINE" ]] && continue
+		var="${cur%%=*}"
+		[[ "$cur" = "$var" ]] && continue
+		echo "$var"
+	done
+}
+
+add_debug_service() {
+	local cfg="$1"
+
+	json_add_object "$cfg"
+	for var in $(get_vars "$cfg"); do
+		config_get val "$cfg" "$var"
+		json_add_string "$var" "$val"
+	done
+	json_close_object "$cfg"
+}
+
+reload_service() {
+	config_load udebug
+
+	json_init
+	json_add_object service
+	config_foreach add_debug_service service
+	json_close_object
+	ubus call udebug set_config "$(json_dump)"
+}
+
+service_triggers() {
+	procd_add_reload_trigger udebug
+}
+
+service_started() {
+	ubus -t 10 wait_for udebug
+	[ $? = 0 ] && reload_service
+}