[FIX] point_of_sale: Stop led_status.sh on update

The fact that led_status.sh was still running when performing the
`git reset --hard` made it impossible to remount the filesystem in RO
mode, due to a `mount point is busy` error.

Instead of starting the led_status_sh script from rc.local, we make it
a service so it can be easily restarted when an update is performed.

closes odoo/odoo#54339

Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>

addons/point_of_sale/tools/posbox/configuration/posbox_update.sh

@@ -2,6 +2,8 @@
 
 sudo mount -o remount,rw /
 
+sudo service led-status stop
+
 cd /home/pi/odoo
 localbranch=$(git symbolic-ref -q --short HEAD)
 localremote=$(git config branch.$localbranch.remote)
@@ -25,4 +27,7 @@ done
 
 sudo mount -o remount,ro /
 sudo mount -o remount,rw /root_bypass_ramdisks/etc/cups
+
+sudo service led-status start
+
 (sleep 5 && sudo service odoo restart) &

addons/point_of_sale/tools/posbox/overwrite_after_init/etc/rc.local

@@ -20,7 +20,6 @@ fi
 mkdir -p /var/run/odoo
 chown pi:pi /var/run/odoo
 
-/home/pi/odoo/addons/point_of_sale/tools/posbox/configuration/led_status.sh &
 /home/pi/odoo/addons/point_of_sale/tools/posbox/configuration/wireless_ap.sh &
 
 exit 0

addons/point_of_sale/tools/posbox/overwrite_before_init/etc/init_posbox_image.sh

@@ -145,6 +145,7 @@ update-rc.d -f dnsmasq remove
 update-rc.d timesyncd defaults
 
 systemctl enable ramdisks.service
+systemctl enable led-status.service
 systemctl disable dphys-swapfile.service
 systemctl enable ssh
 systemctl set-default graphical.target

addons/point_of_sale/tools/posbox/overwrite_before_init/etc/systemd/system/led-status.service

+[Unit]
+Description=Led Status
+After=sysinit.target local-fs.target
+
+[Service]
+Type=simple
+ExecStart=/home/pi/odoo/addons/point_of_sale/tools/posbox/configuration/led_status.sh
+
+[Install]
+WantedBy=basic.target