Internet External Program Execution

[HansR]

When I try to execute an external program on RPi Linux (for the ease of testing on the Realtime frequency) I get the following:

Schermafbeelding 2022-12-15 090133.jpg

which results in this output in the logfile:

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2022-12-15 09:03:28.718 Realtime[56]: Execute realtime program - utils/bin/cumulusutils.exe 
2022-12-15 09:03:28.718 Realtime[56]: Error in realtime program - utils/bin/cumulusutils.exe . Error: ApplicationName='utils/bin/cumulusutils.exe ', CommandLine='sysinfo', CurrentDirectory='', Native error= Cannot find the specified file

I have tried full path specification and I have tried mono as executable (and the rest as parameters) but it will not start.
I assumed the CurrentDirectory would be the CumulusMX directory. Is that correct?

The basic question is: why does it not execute?
When I did this some years ago it did not pose any problem. Any changes?

And as you may guess: executing it manually or from crontab is successful (in crontab I need to change directory to my CumulusMX directory before the running the executable).

[HansR]

OK, I'll answer the question myself: removing the space at the end of the executable filename it works.
Suggestion: trimming the line may be useful.
This took me quite some (too much) time...

[mcrossley]

good idea.

[NeilThomas]

Hi

I'm trying to run an external program Python on my Interval time. I have confirmed that the program works in the terminal but no matter what I try in CumulusMX I get different results but no success.

I have tried the following Interval program entries:
python3 /home/neil/Documents/Python/mysqlInt.py &
/home/neil/Documents/Python/mysqlInt.py

The first returns: Traceback (most recent call last):
File "/home/neil/Documents/Python/mysqlInt.py", line 11, in <module>
import mariadb
ModuleNotFoundError: No module named 'mariadb'
and in the MXDiags error log: 2024-01-15 18:06:00.804 Interval: Error starting external program: ApplicationName='python3 /home/neil/Documents/Python/mysqlInt.py', CommandLine='', CurrentDirectory='', Native error= Cannot find the specified file

The the second simply doesn't run and produces no errors in the log.

The mariadb library exists in the standard library location.

Neil

[mcrossley]

Is MX running under the same userid as you used to test from the command line?

[rogerthn]

Hi

I'm trying to run an external program Python on my Interval time. I have confirmed that the program works in the terminal but no matter what I try in CumulusMX I get different results but no success.
...

Please try command below as root, assuming that CumusMX is started like sudo ...

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python3 -c "import mariadb"

[mcrossley]

The second has no executable. It would work from say bash due to the association of .py files with python within bash. With MX there is no bash so you must provide the executable, and the parameters.

[NeilThomas]

Is MX running under the same userid as you used to test from the command line?

The file is set to allow anyone to execute it.

Neil

[mcrossley]

Maybe, but does it run? I'm not familiar with python but I suspect it may need environment variables or paths setting up under the userid?

[rogerthn]

Maybe mariadb is "installed" as below as user pi

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pip3 install mariadb

Then it will only be pi that is aware of mariadb

[freddie]

The second has no executable. It would work from say bash due to the association of .py files with python within bash. With MX there is no bash so you must provide the executable, and the parameters.

There is no file association within Linux. You would need to provide the Python executable, as Mark says (and as you did in the first eg)

[freddie]

Maybe, but does it run? I'm not familiar with python but I suspect it may need environment variables or paths setting up under the userid?

Python is running just fine, it's the mariadb module that it can't find. This is very likely that the PYTHONPATH environment variable is not present when your script is executed in the MX mono environment.

There is a well defined search path used by Python when looking for modules. I'm no Python expert, but what I would do in this situation is have MX call a bash script, and the bash script would set the PYTHONPATH environment variable and then call your python script.

[NeilThomas]

Hi all

Issue solved - thanks for the help.

Firstly it was down to the pythonpath variable but I solved this by installing the library module as admin so it was available to the admin user. Secondly, even though the bash script and the python program were allowed to be run by anyone, I still had to invoke python as the admin user. The bash script has to be:

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sudo python3 <python program>

Neil