From patchwork Mon Jul 10 10:34:15 2017
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Subject: [RFC] fff-autorestart: Add autorestart package
From: Adrian Schmutzler <freifunk@adrianschmutzler.de>
X-Patchwork-Id: 378
Message-Id: <1499682855-1709-1-git-send-email-freifunk@adrianschmutzler.de>
To: franken-dev@freifunk.net
Cc: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Date: Mon, 10 Jul 2017 12:34:15 +0200

This package implements an auto-restart if the router has not
been able to connect to a gateway for more than 30 minutes. If
there had been an error or crash causing the interruption, it
may be resolved by the restart while no harm is done. Setting
/tmp/gatewayoff to '0' disables the whole process.

After the second restart, the delay is raised so the third and
subsequent restarts are limited to one per day.

This is an alternative to my earlier RFC, limiting the number
of restarts per time, but therefore introducing a small file
on the non-volatile memory. Again, any comments,
suggestions and so forth are welcome!

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
---
 src/packages/fff/fff-autorestart/Makefile          | 40 ++++++++++++++++
 .../files/usr/lib/micron.d/fff-autorestart         |  1 +
 .../fff-autorestart/files/usr/sbin/offlinerestart  | 53 ++++++++++++++++++++++
 src/packages/fff/fff/Makefile                      |  1 +
 4 files changed, 95 insertions(+)
 create mode 100755 src/packages/fff/fff-autorestart/Makefile
 create mode 100644 src/packages/fff/fff-autorestart/files/usr/lib/micron.d/fff-autorestart
 create mode 100755 src/packages/fff/fff-autorestart/files/usr/sbin/offlinerestart

diff --git a/src/packages/fff/fff-autorestart/Makefile b/src/packages/fff/fff-autorestart/Makefile
new file mode 100755
index 0000000..b48542a
--- /dev/null
+++ b/src/packages/fff/fff-autorestart/Makefile
@@ -0,0 +1,40 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=fff-autorestart
+PKG_VERSION:=1
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/fff-autorestart
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/fff-autorestart
+    SECTION:=base
+    CATEGORY:=Freifunk
+    TITLE:= Freifunk-Franken Auto-Restart
+    URL:=http://www.freifunk-franken.de
+    DEPENDS:=+micrond
+endef
+
+define Package/fff-autorestart/description
+    This restarts the router if no connection
+	to gateways is available
+endef
+
+define Build/Prepare
+	echo "all: " > $(PKG_BUILD_DIR)/Makefile
+endef
+
+define Build/Configure
+	# nothing
+endef
+
+define Build/Compile
+	# nothing
+endef
+
+define Package/fff-autorestart/install
+    $(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,fff-autorestart))
diff --git a/src/packages/fff/fff-autorestart/files/usr/lib/micron.d/fff-autorestart b/src/packages/fff/fff-autorestart/files/usr/lib/micron.d/fff-autorestart
new file mode 100644
index 0000000..885b50a
--- /dev/null
+++ b/src/packages/fff/fff-autorestart/files/usr/lib/micron.d/fff-autorestart
@@ -0,0 +1 @@
+*/5 * * * * /usr/sbin/offlinerestart
diff --git a/src/packages/fff/fff-autorestart/files/usr/sbin/offlinerestart b/src/packages/fff/fff-autorestart/files/usr/sbin/offlinerestart
new file mode 100755
index 0000000..ef6527a
--- /dev/null
+++ b/src/packages/fff/fff-autorestart/files/usr/sbin/offlinerestart
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+UPPER_LIMIT='50' # Above this limit the gateway will be considered online
+LOWER_LIMIT='20' # Below this limit the gateway will be considered offline
+# In-between these two values the state is not changed
+
+NOW=$(date +%s)
+
+if [ -s /tmp/gatewayoff ] && grep -q '0' /tmp/gatewayoff ; then
+    exit 0
+fi
+
+GATEWAY_TQ=$(batctl gwl | grep "^=>" | awk -F'[()]' '{print $2}'| tr -d " ") # Grep the connection quality of the gateway which is currently used
+if [ ! "$GATEWAY_TQ" ]; # If there is no gateway there will be errors in the following if clauses
+then
+	GATEWAY_TQ=0 # Just an easy way to get an valid value if there is no gateway
+fi
+if [ $GATEWAY_TQ -gt $UPPER_LIMIT ];
+then
+	echo "Gateway TQ is $GATEWAY_TQ - Node is online"
+	if [ -s /tmp/gatewayoff ] ; then 
+		rm -f /tmp/gatewayoff
+	fi
+	if [ -s /etc/autorestartcount ] ; then 
+		rm -f /etc/autorestartcount
+	fi
+fi
+if [ $GATEWAY_TQ -lt $LOWER_LIMIT ];
+then
+	echo "Gateway TQ is $GATEWAY_TQ - Node is considered offline"
+	if [ ! -s /tmp/gatewayoff ] ; then 
+		echo "$NOW" > /tmp/gatewayoff
+	fi
+	OFFLINESINCE=$(($(date +%s)-1800)) # Restart after 30 minutes
+	OFFLINEDAY=$(($(date +%s)-86400)) # Restart after 30 minutes
+	if [ "$(cat /tmp/gatewayoff)" -lt "$OFFLINESINCE" ] ; then
+		if [ -s /etc/autorestartcount ] ; then # Auto-restart has already taken place
+		    restartcount="$(cat /etc/autorestartcount)"
+			if [ "$restartcount" -lt 2 ] || [ "$(cat /tmp/gatewayoff)" -lt "$OFFLINEDAY" ] ; then
+				# 1st and 2nd restart after 30 minutes, 3rd+ restart after one day
+				echo $((restartcount + 1)) > /etc/autorestartcount
+				reboot && exit
+			fi
+		else
+			echo "1" > /etc/autorestartcount
+			reboot && exit
+		fi
+	fi
+fi
+if [ $GATEWAY_TQ -ge $LOWER_LIMIT ] && [ $GATEWAY_TQ -le $UPPER_LIMIT ]; # This is just to get a clean run if we are in-between the grace periode
+then
+	echo "Gateway TQ is $GATEWAY_TQ - Do nothing"
+fi
diff --git a/src/packages/fff/fff/Makefile b/src/packages/fff/fff/Makefile
index b039c2d..21ed827 100644
--- a/src/packages/fff/fff/Makefile
+++ b/src/packages/fff/fff/Makefile
@@ -18,6 +18,7 @@ define Package/fff-base
              +ip6tables \
              +odhcp6c \
              +micrond \
+			 +fff-autorestart \
              +fff-nodewatcher \
              +fff-web \
              +fff-uradvd \