net-nut: Add UPS notifications via sendmail

Add option to send email notification via sendmail
(or replacement).

Signed-off-by: Daniel Dickinson <lede@cshore.thecshore.com>

net/nut/files/nut-sendmail-notify

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+/usr/sbin/sendmail root <<EOF
+From: root
+To: root
+Subject: UPS $NOTIFYTYPE Notification
+
+$1
+.
+EOF

net/nut/files/nut-sendmail-notify.default

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+. /lib/functions.sh
+
+REMOVEDEFAULTNOTIFY=0
+SKIPADDSYSLOG=0
+SKIPADDEXEC=0
+
+upsmon() {
+	local cfg="$1"
+	local val
+
+	config_get val "$cfg" defaultnotify
+	if [ -n "$val" ]; then
+		if echo "$val" |grep -q "IGNORE"; then
+			REMOVEDEFAULTNOTIFY=1
+		else
+			SKIPADDSYSLOG=1
+			if echo "$val" |grep -q "EXEC"; then
+				SKIPADDEXEC=1
+			fi
+		fi
+	fi
+}
+
+config_load nut_monitor
+config_foreach upsmon upsmon
+
+uci set nut_monitor.@upsmon[-1]=upsmon
+uci set nut_monitor.@upsmon[-1].notifycmd=/usr/bin/nut-sendmail-notify
+
+if [ "$REMOVEDEFAULTNOTIFY" = "1" ]; then
+	uci delete nut_monitor.@upsmon[-1].defaultnotify || true
+fi
+
+if [ "$SKIPADDEXEC" != "1" ]; then
+	uci add_list nut_monitor.@upsmon[-1].defaultnotify="EXEC"
+fi
+
+if [ "$SKIPADDSYSLOG" != "1" ]; then
+	uci add_list nut_monitor.@upsmon[-1].defaultnotify="SYSLOG"
+fi
+
+uci commit nut_monitor