logmngr: add logrotate support

* add support for logrotate functionality to logmngr

logmngr/Config.in

@@ -17,4 +17,10 @@ config LOGMNGR_BACKEND_SYSLOG_NG
 		Enable this option to use syslog-ng for log management.
 
 endchoice
+config LOGMNGR_LOGROTATE
+	bool "Logrotate support"
+	depends on PACKAGE_logmngr
+	default y
+	help
+		It adds support for logrotate functionality.
 endif

logmngr/Makefile

@@ -3,7 +3,6 @@
 #
 
 include $(TOPDIR)/rules.mk
-include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=logmngr
 PKG_VERSION:=1.0.1
@@ -11,7 +10,7 @@ LOCAL_DEV:=0
 ifneq ($(LOCAL_DEV),1)
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://dev.iopsys.eu/system/logmngr.git
-PKG_SOURCE_VERSION:=d107b8b65dd63709c85a1b907108bb0b6a13572c
+PKG_SOURCE_VERSION:=ec10abb3cc0f3b96eb806c9c67e18d9d134287e9
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_MIRROR_HASH:=skip
 endif
@@ -25,9 +24,10 @@ include ../bbfdm/bbfdm.mk
 MAKE_PATH:=bbf_plugin
 
 define Package/logmngr
+ SECTION:=utils
  CATEGORY:=Utilities
  TITLE:=Logging Manager
- DEPENDS:=+libbbfdm-api +LOGMNGR_BACKEND_FLUENTBIT:fluent-bit
+ DEPENDS:=+libbbfdm-api +LOGMNGR_BACKEND_FLUENTBIT:fluent-bit +LOGMNGR_LOGROTATE:logrotate
  DEPENDS+=+LOGMNGR_BACKEND_SYSLOG_NG:syslog-ng
 endef
 
@@ -63,7 +63,12 @@ endif
 ifeq ($(CONFIG_LOGMNGR_BACKEND_SYSLOG_NG),y)
 	$(INSTALL_DATA) ./files/lib/logmngr/syslog-ng.sh $(1)/lib/logmngr/.
 endif
-	$(BBFDM_INSTALL_MS_DM) $(PKG_BUILD_DIR)/bbf_plugin/libsyslog.so $(1) $(PKG_NAME)
+	$(BBFDM_INSTALL_CORE_PLUGIN) $(PKG_BUILD_DIR)/bbf_plugin/libbbfsyslog.so $(1)
+ifeq ($(CONFIG_LOGMNGR_LOGROTATE),y)
+	$(INSTALL_BIN) ./files/11-logmngr_logrotate_config_generate $(1)/etc/uci-defaults/
+	$(INSTALL_DATA) ./files/lib/logmngr/logrotate.sh $(1)/lib/logmngr/.
+	$(BBFDM_INSTALL_CORE_PLUGIN) $(PKG_BUILD_DIR)/bbf_plugin/libbbflogrotate.so $(1)
+endif
 endef
 
 $(eval $(call BuildPackage,logmngr))

logmngr/files/10-logmngr_config_generate

@@ -20,3 +20,4 @@ uci set logmngr.lf1=log_file
 uci set logmngr.lf1.enable=1
 uci set logmngr.lf1.action="ac1"
 uci set logmngr.lf1.file="/var/log/messages"
+uci commit logmngr

logmngr/files/11-logmngr_logrotate_config_generate

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+if [ -s "/etc/config/logmngr" ]; then
+	if uci -q get logmngr.@log_rotate[0] >/dev/null; then
+		# return if there is any valid content
+		exit
+	fi
+	uci set logmngr.lro1=log_rotate
+	uci set logmngr.lro1.enable=1
+	uci set logmngr.lro1.file_name="/var/log/messages"
+	uci set logmngr.lro1.file_count=1
+	uci set logmngr.lro1.max_file_size=1000000
+	uci commit logmngr
+fi

logmngr/files/lib/logmngr/fluent-bit.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 . /lib/functions.sh
+. /lib/logmngr/logrotate.sh
 
 CONF_FILE=/etc/fluent-bit/fluent-bit.conf
 TMP_CONF_FILE=/tmp/fluent-bit/fluent-bit.conf
@@ -306,6 +307,10 @@ logmngr_init() {
 	handle_action_section
 	apply_config_file
 
+	if [ -f /lib/logmngr/logrotate.sh ]; then
+		logrotate_init
+	fi
+
 	procd_open_instance logmngr
 	procd_set_param command $PROG -c $CONF_FILE
 	procd_set_param file $CONF_FILE

logmngr/files/lib/logmngr/logrotate.sh

@@ -0,0 +1,96 @@
+#!/bin/sh
+
+. /lib/functions.sh
+
+LOGROTATE_FILE=/etc/logrotate.conf
+LOGROTATE_TMP_FILE=/tmp/logrotate/logrotate.conf
+
+create_logrotate_file() {
+	mkdir -p /tmp/logrotate
+	rm -f ${LOGROTATE_TMP_FILE}
+	touch ${LOGROTATE_FILE}
+}
+
+
+handle_logrotate() {
+	local section="$1"
+
+	local enabled
+	config_get enabled $section enable
+	if [ "$enabled" == "0" ]; then
+		return
+	fi
+
+	local file_name
+	config_get file_name $section file_name
+	if [ -z "$file_name" ]; then
+		# no file to rotate, return
+		return
+	fi
+
+	echo -e "$file_name {" >> ${LOGROTATE_TMP_FILE}
+	echo -e "\tcreate" >> ${LOGROTATE_TMP_FILE}
+	echo -e "\tmissingok" >> ${LOGROTATE_TMP_FILE}
+	echo -e "\tnotifempty" >> ${LOGROTATE_TMP_FILE}
+
+	local file_count
+	config_get file_count $section file_count
+	if [ -n "$file_count" ]; then
+		echo -e "\trotate $file_count" >> ${LOGROTATE_TMP_FILE}
+	fi
+
+	local max_file_size
+	config_get max_file_size $section max_file_size
+	if [ -n "$max_file_size" ]; then
+		echo -e "\tmaxsize $max_file_size" >> ${LOGROTATE_TMP_FILE}
+	fi
+
+	local duration
+	config_get duration $section duration
+	if [ -n "$duration" ]; then
+		echo -e "\tminutes $duration" >> ${LOGROTATE_TMP_FILE}
+	fi
+
+	local retention
+	config_get retention $section retention
+	if [ -n "$retention" ]; then
+		echo -e "\tmaxage $retention" >> ${LOGROTATE_TMP_FILE}
+	fi
+
+	local compression
+	config_get compression $section compression
+	if [ -n "$compression" ]; then
+		echo -e "\tcompress" >> ${LOGROTATE_TMP_FILE}
+		echo -e "\tcompresscmd $compression" >> ${LOGROTATE_TMP_FILE}
+	fi
+
+	echo -e "\tpostrotate" >> ${LOGROTATE_TMP_FILE}
+	echo -e "\t\tservice logmngr restart" >> ${LOGROTATE_TMP_FILE}
+	echo -e "\t\tsleep 1" >> ${LOGROTATE_TMP_FILE}
+	echo -e "\tendscript" >> ${LOGROTATE_TMP_FILE}
+	echo -e "}" >> ${LOGROTATE_TMP_FILE} # close the logfile section
+}
+
+apply_logrotate_file() {
+	cp ${LOGROTATE_TMP_FILE} ${LOGROTATE_FILE}
+}
+
+config_cron_job() {
+	# taking the liberty to configure the cron job hourly, that is, at the end
+	# of each hour, check if logrotation is needed. The logrotate daemon, when
+	# triggered hourly, will still honour the configure log rotation duration,
+	# the only slight different being that if the minutes for log rotation
+	# are configured in such a way that it falls within the hour, then the
+	# log rotation will be done at the completion of hour and not before. I do
+	# not think this is a drawback in the interest of keeping things simple.
+	sed -i '/logrotate/d' /etc/crontabs/root
+	echo "0 * * * * logrotate ${LOGROTATE_FILE}" >> /etc/crontabs/root
+	/etc/init.d/cron restart
+}
+
+logrotate_init() {
+	create_logrotate_file
+	config_foreach handle_logrotate log_rotate
+	apply_logrotate_file
+	config_cron_job
+}

logmngr/files/lib/logmngr/syslog-ng.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 . /lib/functions.sh
+. /lib/logmngr/logrotate.sh
 
 CONF_FILE=/etc/syslog-ng.conf
 TMP_CONF_FILE=/tmp/syslog-ng/syslog-ng.conf
@@ -334,6 +335,10 @@ logmngr_init() {
 	handle_action_section
 	apply_config_file
 
+	if [ -f /lib/logmngr/logrotate.sh ]; then
+		logrotate_init
+	fi
+
 	procd_open_instance logmngr
 	procd_set_param command $PROG reload
 	procd_close_instance