OLED Monitor: use venv and leverage start script in systemd service (#347)

* Add start script for oled monitor

* systemd service definition for oled monitor

* Remove superfluous file

* Bump library versions to avoid erroring out

* Revert mistaken changes

* Revert mistaken changes

src/oled_monitor/monitor_rascsi.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Monitor RaSCSI service
+After=network.target rascsi.service
+
+[Service]
+Type=simple
+Restart=always
+ExecStart=/home/pi/RASCSI/src/oled_monitor/start.sh
+StandardOutput=syslog
+StandardError=syslog
+SyslogIdentifier=RASCSIMON
+
+[Install]
+WantedBy=multi-user.target

src/oled_monitor/requirements.txt

@@ -1,15 +1,15 @@
-Adafruit-Blinka==6.3.2
-adafruit-circuitpython-busdevice==5.0.6
-adafruit-circuitpython-framebuf==1.4.6
-adafruit-circuitpython-ssd1306==2.11.1
-Adafruit-PlatformDetect==3.2.0
-Adafruit-PureIO==1.1.8
-Pillow==8.3.2
+Adafruit-Blinka==6.15.0
+adafruit-circuitpython-busdevice==5.1.0
+adafruit-circuitpython-framebuf==1.4.7
+adafruit-circuitpython-ssd1306==2.12.2
+Adafruit-PlatformDetect==3.13.0
+Adafruit-PureIO==1.1.9
+Pillow==8.4.0
 pkg-resources==0.0.0
-pyftdi==0.52.9
+pyftdi==0.53.3
 pyserial==3.5
-pyusb==1.1.1
-rpi-ws281x==4.2.5
+pyusb==1.2.1
+rpi-ws281x==4.3.0
 RPi.GPIO==0.7.0
 sysv-ipc==1.1.0
 protobuf==3.17.3

src/oled_monitor/start.sh

@@ -2,7 +2,7 @@
 set -e
 # set -x # Uncomment to Debug
 
-cd $(dirname $0)
+cd "$(dirname "$0")"
 # verify packages installed
 ERROR=0
 if ! command -v dpkg -l i2c-tools &> /dev/null ; then
@@ -31,7 +31,6 @@ if ! dpkg -l libpng-dev &> /dev/null; then
     echo "Run 'sudo apt install libpng-dev' to fix."
     ERROR=1
 fi
-# Dep to build Pollow
 if ! python3 -m venv --help &> /dev/null ; then
     echo "venv could not be found"
     echo "Run 'sudo apt install python3-venv' to fix."
@@ -53,6 +52,7 @@ if ! test -e venv; then
   echo "Activating venv"
   source venv/bin/activate
   echo "Installing requirements.txt"
+  pip install wheel
   pip install -r requirements.txt
   git rev-parse HEAD > current
 fi
@@ -65,8 +65,6 @@ if ! test -e current; then
 else
   if [ "$(cat current)" != "$(git rev-parse HEAD)" ]; then
       echo "New version detected, updating requirements.txt"
-      echo " This may take some time..."
-      pip install wheel
       pip install -r requirements.txt
       git rev-parse HEAD > current
   fi