Custom Script and Python Version

[ronhow]

Hello,

I am attempting to use a custom command to perform a Service Check.
I am added a Python script to /usr/local/nagios/libexec.
I have created the command itself:

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/usr/bin/python3 $USER1$/my_script.py $ARG1$ $ARG2$ $ARG3$

Within my script:

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#!/usr/bin/python3

import requests

However, I will get error:

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module 'requests' has no attribute 'request'

I have installed requests library with pip3 and pip3 list shows I have

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Package            Version
------------------ -----------
requests           2.27.1

I am only suspecting that the script is being run with python2.7 despite me trying to have 3.6 run it.
Can anyone share some pointers, please?

[lgute]

Hi @ronhow, thanks for reaching out.

Disclaimer: Not a Python expert.

Did you ever have a python file named requests.py in /usr/local/nagios/libexec? Python Attribute Error

I can simulate your error by doing the following...

1. Create a file named /usr/local/nagios/libexec/my_script.py, with the following...

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   #!/usr/bin/env python3
   import requests
   firstRequest = requests.request('https://api.github.com/events')
   

2. # touch /usr/local/nagios/libexec/requests.py
3. # python3 my_script.py

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   Traceback (most recent call last):
     File "my_script.py", line 3, in <module>
       firstRequest = requests.request('https://api.github.com/events')
   AttributeError: module 'requests' has no attribute 'request'
   

4. # python2 my_script.py
   

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   Traceback (most recent call last):
     File "my_script.py", line 3, in <module>
       firstRequest = requests.request('https://api.github.com/events')
   AttributeError: 'module' object has no attribute 'request'
   

It actually creates quite a mess, because removing /usr/local/nagios/libexec/requests.py just gave me a different error...

# python3 my_script.py

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Traceback (most recent call last):
  File "my_script.py", line 2, in <module>
    import requests
ImportError: bad magic number in 'requests': b'\x03\xf3\r\n'

Which means the library module has been damaged.

After a little digging...

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# find / -name "*.pyc" 2> /dev/null | grep "requests\..*.pyc"
/usr/local/nagios/libexec/__pycache__/requests.cpython-37.pyc

# ls -l /usr/local/nagios/libexec/__pycache__/requests.cpython-37.pyc 
-rw-r--r-- 1 root nagios 124 Aug 30 12:04 /usr/local/nagios/libexec/__pycache__/requests.cpython-37.pyc

# cat /usr/local/nagios/libexec/__pycache__/requests.cpython-37.pyc 
B
�v�d�@sdS)N�rrr�%/usr/local/nagios/libexec/requests.py<module>�root@debian:/usr/local/nagios/libexec# 

This issue was resolved by removing the "new" /usr/local/nagios/libexec/__pycache__/requests*.pyc file.

[ronhow]

Hi Laura,

Thanks very much for the feedback.

I've never created any such file and I am not aware of anyone on my team that has either.
I've checked for presence of any requests (ending in.py or .pyc) anywhere on the system - but don't find any result so that doesn't appear to be it.

If I run the script from the command line, without specifying the interpreter in the command line but specifying

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#!/usr/bin/python3

at the top of my script, it works as expected.

If I omit

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#!/usr/bin/python3

from the script heading, and also do not specify in the command definition to use that interpreter, the command does not appear to run at all (no error).

So for some reason, Nagios itself when running the command I have created appears to be using perhaps 2.7 and that is where the module is missing an attribute etc. - I am not sure.
Yet trying to enforce the 3.6 interpreter at command definition doesn't make a difference, but setting the interpreter within the script and running at command line does work.

[ronhow]

If I add

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print(requests.__file__)
print(platform.python_version())

to my script and run it from command line it runs as expected and the print line gives output:

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/usr/local/lib/python3.6/site-packages/requests/__init__.py
3.6.8

However if I run same script from Nagios itself, I get no output.

If I comment the 'requests.__file__' line, I get same attribute error:

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3.6.8
WARNING failed to retrieve data
module 'requests' has no attribute 'get'