python script not executed automatically

aldebaranhg · February 7, 2021 at 6:28 PM

I installed libreelec using image

Thesystem boots automatically into KODI.

if i login over ssh with MobaXterm 20.6 i see:

LibreELEC (official): 9.2.6 (RPi4.arm)

LibreELEC:~ #

So I would like to control my ambilight at the same time via hyperion.ng

In order to shutdown the Raspi automatically when switching off power

I use the hardware extension "StromPi3".

Therefore a python script ("powershutdown_serialless.py)must be

executed when starting up the Raspi.

In the forum I found the post by "jakob" from June 13, 2020 and then made all

the settings :

- install "Raspberry Pi Tools" add-on

- create the folder /storage/.kodi/userdata/scripts

- insert lines in my powershutdown_serialless.py

import sys

sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')

- put powershutdown_serialless.py into /storage/.kodi/userdata/scripts

- create /storage/.config/autostart.sh

both files attached in the datei.zip.

When i start the powershutdown_serialless.py from an ssh terminal see hier :

LibreELEC (official): 9.2.6 (RPi4.arm)

LibreELEC:~ #

LibreELEC:~ # python /storage/.kodi/userdata/scripts/powershutdown_serialless.py &

LibreELEC:~ # Safe Shutdown in the case of Powerfailure (CTRL-C for exit)

it works fine. But on booting the raspi the script "powershutdown_serialless.py"

is not executed.

Where is the mistake ?

many thanks for the support

Mario77 · February 10, 2021 at 9:02 PM

Check your autostart.sh script if you just created it for any errors DOS format and not UNIX?

this should start your script like on startup..

Code

sh /storage/.config/autostart.sh

run this on autostart.sh

Code

dos2unix /storage/.config/autostart.sh

chmod 777 /storage/.config/autostart.sh

the autostart.sh in your zip file is in windows dos...needs to be unix format..but might have changed by uploading or downloading or whatever..not sure...try those 2 commands and you should be good to go..

aldebaranhg · February 11, 2021 at 2:48 PM

the problem was definitely autostart.sh

I logged in with a terminal program (mobaxterm) and the /storage/.config/autostart.sh file was just one line
python /storage/.kodi/userdata/scripts/powershutdown_serialless.py &

created and the rights set with chmod.
the command is now executed correctly. after entering ps -ef i can also see the running process. 566 root 0:00 python /storage/.kodi/userdata/scripts/powershutdown_serialless.py

it would be nice if a message could be sent to all logged-in terminals in the event of a power failure - is that possible?

the print commands from the powershutdown_serialless.py script do not arrive on a logged-in terminal

Many Thanks

Mario77 · February 11, 2021 at 6:07 PM

Quote from aldebaranhg

the problem was definitely autostart.sh
I logged in with a terminal program (mobaxterm) and the /storage/.config/autostart.sh file was just one line
python /storage/.kodi/userdata/scripts/powershutdown_serialless.py &
created and the rights set with chmod.
the command is now executed correctly. after entering ps -ef i can also see the running process. 566 root 0:00 python /storage/.kodi/userdata/scripts/powershutdown_serialless.py
it would be nice if a message could be sent to all logged-in terminals in the event of a power failure - is that possible?
the print commands from the powershutdown_serialless.py script do not arrive on a logged-in terminal
Many Thanks

Display More

try before line 50 in your script add

Code

os.system("echo "Raspberry Pi Shutdown!" >/dev/pts/1")

that is for 1 open terminal

if you have more then

to find all open terminals

Code

find /dev/pts

then you can edit your script ex

Code

os.system("echo "Raspberry Pi Shutdown!" >/dev/pts/1")
os.system("echo "Raspberry Pi Shutdown!" >/dev/pts/2")
os.system("echo "Raspberry Pi Shutdown!" >/dev/pts/3")

etc

that should send a message to all terminals

"Raspberry Pi Shutdown!"

aldebaranhg · February 11, 2021 at 8:11 PM

thank you for your prompt reply
Unfortunately I don't get any output on my terminal (MobaXterm via ssh)
when I insert the new line:
if x> = ShutdownTimer:

print ("Raspberry Pi Shutdown!")

os.system ("echo" Raspberry Pi Shutdown! "> / dev / pts / 1")

time.sleep (5)

os.system ("shutdown -h now")

the modified script is no longer executed - no display of 687 root 0:00 python /storage/.kodi/userdata/scripts/powershutdown_serialless.py
more about the processes at ps -ef

I also tried to add a waiting time so that the message could be read, but it didn't work either.

aldebaranhg · February 11, 2021 at 9:06 PM

additive
sh /storage/.config/autostart.sh results in:
LibreELEC: ~ # sh /storage/.config/autostart.sh
LibreELEC: ~ # File "/storage/.kodi/userdata/scripts/powershutdown_serialless.py", line 51 os.system ("echo" Raspberry Pi Shutdown! "> / dev / pts / 1") ^
SyntaxError: invalid syntax

Mario77 · February 11, 2021 at 10:19 PM

Quote from aldebaranhg

additive
sh /storage/.config/autostart.sh results in:
LibreELEC: ~ # sh /storage/.config/autostart.sh
LibreELEC: ~ # File "/storage/.kodi/userdata/scripts/powershutdown_serialless.py", line 51 os.system ("echo" Raspberry Pi Shutdown! "> / dev / pts / 1") ^
SyntaxError: invalid syntax

Code

os.system("echo "Raspberry Pi Shutdown!" >/dev/pts/1")

try copy and paste this exactly..

below is yours...you moved few bits:

Code

os.system ("echo" Raspberry Pi Shutdown! "> / dev / pts / 1")

It worked here...no reason it doesn't work for you...you can open more terminal windows to test from one to the other and you ll see the message popping up..

I m not great with python hence i gave you the shell version of the command..you r basically sending an sh command from a py script..

I m not sure what your script is for but if it's something important you can even send an automated email from libreelec to your email..

aldebaranhg · February 13, 2021 at 1:20 PM

i copied the code exactly. Maybe some characters (space) got into it through later editing (google translater).
Sorry, I still have to learn how to correctly compose my posts!
I think the python interpreter cannot recognize the expression os.system..... The normal shellcommando

LibreELEC: ~ # os.system ("echo" Raspberry Pi Shutdown! "> / Dev / pts / 0")
sh: syntax error: unexpected word (expecting ")") does not work under Libreelec either.

with LibreELEC: ~ / .config # echo "3456"> / dev / pts / 0
3456
can I send texts between logged-in terminals.

to your question:
the script powershutdown_serialless shuts down the raspi at power off. That works fine. I can also do without the additional issue of a message.

when I start the script manually:
LibreELEC: ~ / .kodi / userdata / scripts # python powershutdown_serialless.py &
LibreELEC: ~ / .kodi / userdata / scripts # Safe Shutdown in the case of Powerfailure (CTRL-C for exit)
Here you can also see that the script is working properly:
messages are issued.
Case 1 momentary power failure
LibreELEC: ~ / .config #
LibreELEC: ~ / .config # Raspberry Pi Powerfail detected
Raspberry Pi Power Back Detected!

Case 2 long failure power
LibreELEC: ~ / .config #
LibreELEC: ~ / .config # Raspberry Pi Powerfail detected
Raspberry Pi Shutdown!

The main thing is that the script is started automatically and works properly.
Thanks again