I got a python script which exports data to PVOutput.org. Using Putty I am able to run the script successfully using the following:
nohup python /data/dbus-pvoutput.py > /data/pvoutput.log &
The trouble happens when the CerboGX is rebooted. I realise the need to have the dbus-pvoutput.py run at startup. What do I need to do. Please be patient as its a miracle that I am even asking this question. I am no coder feel free to treat me as a dummy!
in /data you can create a script called rcS.local. That will be run on every reboot. Also as it is in /data it will not be removed on a system update.
Thanks so much for this. So a line in the script with something like?:
python /data/dbus-pvoutput.py &
Unless the script really needs to be run early, you'd be better creating a file called rc.local as this is executed late in the boot-up process.
I had similar issues and running from rc.local didn't solve them. I ended up running the script in the background, then having the script wait for needed resources (in my case dbus Settings service):
Make the call in rc.local (or rcS.local) this way:
nohup "$script" > /dev/null &
where $script is the path to the script you want executed.
Another way to do this is to set it up as a "service". Services are managed such that they start at boot and will be restarted should they crash without any user intervention.
You create a "run" script that calls you program and another run script that handles logging (if you want).
You place the run and logging run scripts in a "supervise" directory. You then create a symbolic link to the supervise directory in /service
You would still need to insure that the service is reestablished when a Venus software update occurs. A reinstall script is typically called from /data/rc.local that recreates the symbolic link.
logs are typically stored in /var/log/<the name of your service>
This all sounds complicated, but it's pretty simple to set up. You can use my TankRepeater as an example:
https://github.com/kwindrem/TankRepeater
If you don't need to insure your program is always running, the mechanism bathnm describes is probably simpler for a novice.
Good luck.
Thanks this is highly detailed. I wouldn't know which line to start from and where to end!
take a look in the existing /service directory and create a new service with a similar setup as the others.....
so create a directory /service/pvoutput
create a file in that created directory called run which contains as an example
#!/bin/sh
exec 2>&1
exec /data/dbus-pvoutput.py
If you want some looking, within the /service/pvoutput directory create one call log
Within the log directory create a file called run with something like this
#!/bin/sh
exec multilog t s25000 n4 /var/log/dbus-pvoutoput
At least with this if the process crashes the system will restart it.
An alternative would be a cron job, that runs your script on a sheduled time.
