cmd/looper: added build & run utilities including .service file for robust execution

cmd/looper/Makefile

@@ -1,52 +1,84 @@
-# Install rc.local file
+# Install files and directories required by NetSender clients (such as gpio-netsender, rv, etc.)
+# and create a dhcpcd.enter-hook for setting the MAC address.
+# MA and DK can be optionally passed to Make, e.g, for a hard (first-time) installation:
+# 	sudo MA=mac DK=dk install_hard
+# NB: The default (soft) install does not override conf files.
 USER := $(shell whoami)
 PATH := /usr/local/go/bin:$(PATH)
+ifeq ($(MA),)
+	MA := "00:E0:4C:00:00:01"
+endif
+ifeq ($(DK),)
+	DK := 0
+endif
 
-.SILENT:copy_files
+.SILENT:make_dirs
+.SILENT:soft_copy_files
 .SILENT:hard_copy_files
-.SILENT:build
+.SILENT:set_mac
+.SILENT:syncreboot
 .SILENT:clean
 
-install: as_root copy_files build
+install: as_root make_dirs soft_copy_files
 	@echo "Install complete"
 
-install_hard: as_root hard_copy_files build
-	@echo "Install complete"
+install_hard: as_root make_dirs hard_copy_files set_mac syncreboot
+	@echo "Hard install complete"
 
 as_root:
 ifneq ($(USER),root)
 	$(error Must run as superuser!)
 endif
 
-copy_files:
-	if [ -f /etc/rc.local ] ; then \
-		echo "/etc/rc.local left unmodified" ; \
-	else \
-		cp rc.local /etc; \
+make_dirs:
+	if [ ! -d /var/netsender ] ; then \
+		mkdir /var/netsender; \
+		chmod guo+rwx /var/netsender; \
 	fi
+	if [ ! -d /var/log/netsender ] ; then \
+		mkdir /var/log/netsender; \
+		chmod guo+rwx /var/log/netsender; \
+	fi
+
+soft_copy_files:
+	if [ -f /etc/systemd/system/looper.service ] ; then \
+		echo "/etc/systemd/system/looper.service left unmodified" ; \
+	else \
+		cp looper.service /etc/systemd/system; \
+	fi
+	systemctl enable looper.service
+	chmod +x pi_run.sh
 	if [ -f /etc/netsender.conf ] ; then \
 		echo "/etc/netsender.conf left unmodified" ; \
 	else \
-		cp netsender.conf /etc; \
+		printf "ma $(MA)\ndk $(DK)\n" > /etc/netsender.conf; \
+		chown pi /etc/netsender.conf; \
 	fi
 
 hard_copy_files:
-	if [ -f /etc/rc.local ] ; then \
-		echo "Backed up rc.local to /etc/rc.local.bak" ; \
-		cp /etc/rc.local /etc/rc.local.bak ; \
+	if [ -f /etc/systemd/system/looper.service ] ; then \
+		echo "/etc/systemd/system/looper.service overwritten" ; \
 	fi
-	cp -f rc.local /etc
+	cp -f looper.service /etc/systemd/system
+	systemctl enable looper.service
+	chmod +x pi_run.sh
 	if [ -f /etc/netsender.conf ] ; then \
-		echo "Backed up netsender.conf to /etc/netsender.conf.bak" ; \
+		echo "Backed up netsender.conf to /etc/netsender.conf.bak"; \
 		cp /etc/netsender.conf /etc/netsender.conf.bak ; \
 	fi
-	cp -f netsender.conf /etc
+	printf "ma $(MA)\ndk $(DK)\n" > /etc/netsender.conf
+	chown pi /etc/netsender.conf
 
-build:
-	if grep -q 'Raspberry Pi 3' '/proc/device-tree/model'; then \
-		echo "Compiling for Raspberry pi 3";\
-		go build -tags pi3;\
-	else \
-		echo "Compiling for Raspberry pi 0";\
-		go build -tags pi0;\
-	fi
+set_mac:
+	printf "ip link set eth0 address $(MA)\n" > /etc/dhcpcd.enter-hook
+	chmod guo+x /etc/dhcpcd.enter-hook
+
+syncreboot:
+	cd ../../utils/cmd/syncreboot; make; make install
+
+clean: as_root
+	rm -rf /var/netsender
+	rm -rf /var/log/netsender
+	rm -rf /etc/systemd/system/looper.service
+	rm -rf /etc/netsender.conf
+	@echo "Clean complete"

cmd/looper/looper.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=looper is a utility to robustly loop a sound file from a raspberry pi.
+
+[Service]
+Type=simple
+ExecStart=/home/pi/go/src/bitbucket.org/ausocean/av/cmd/looper/pi_run.sh
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target

cmd/looper/pi_run.sh

@@ -0,0 +1,49 @@
+#!/bin/sh -e
+# This script launches looper on a pi, intended to run at boot time.
+
+LOOPER_PATH=/home/pi/go/src/bitbucket.org/ausocean/av/cmd/looper
+
+echo Set kernel parameters:
+# kernel settings to improve performance on Raspberry Pi
+# tell Linux to fork optimistically
+sudo sysctl -w vm.overcommit_memory=1
+# minimize swapping, without disabling it completely
+sudo sysctl -w vm.swappiness=1
+
+# the following required directories _should_ already exist
+if [ ! -d /var/log/netsender ]; then
+  sudo mkdir /var/log/netsender
+  chmod guo+rwx /var/log/netsender
+fi
+if [ ! -d /var/netsender ]; then
+  sudo mkdir /var/netsender
+  chmod guo+rwx /var/netsender
+fi
+
+# show IP addresses
+echo Our IP addresses:
+sudo ip addr show | grep inet
+
+# Start gpio stuff.
+sudo systemctl start pigpiod
+
+
+# capture stdout and stderr to a secondary log file (just in case)
+exec 2> /var/log/netsender/stream.log
+exec 1>&2
+
+# set env, working dir and run looper as pi user
+HOME=/home/pi
+GOPATH=$HOME/go
+LOOPER_PATH=$GOPATH/src/bitbucket.org/ausocean/av/cmd/looper
+PATH=$PATH:/usr/local/go/bin:$LOOPER_PATH
+cd $LOOPER_PATH
+sudo HOME=$HOME GOPATH=$GOPATH PATH=$PATH ./looper
+if [ $? -eq 0 ]
+then
+  echo "Successfully exited looper"
+  exit 0
+else
+  echo "looper exited with code: $?" >&2
+  exit 1
+fi