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Old 07-29-2015, 03:24 AM   #1
browny redandy
LQ Newbie
 
Registered: Jul 2015
Posts: 3

Rep: Reputation: Disabled
Python Script Runs Perfectly on Bash but Fails at Cronjob


Hi,

I have been surfing for almost two days to look for related problem and solutions. But to no avail, I have not found any suitable ones. Any help is greatly appreciated!!

I am using Raspian on Rpi. I am running a python script pi_surveillance.py that requires an activation of the virtual environment cv before the script can work. I am implementing it on cronjob as I wanted it to run at every reboot.

The virtual environment is created for pi user. Hence, what I did was to create a launcher.sh script to activate the environment and run the python script.

Code:
#!/bin/bash
# launcher.sh
# activate the cv environment ,then execute
# python script


source ~/.profile 
workon cv

python  /home/pi/pi_surveillance.py --conf conf.json
For cronjob, what I did was,

Code:
sudo crontab -e
At the last line of the crontab, I added a line:

Code:
@reboot sudo -u pi /home/pi/launcher.sh >/home/pi/logs/cronlog 2>&1
But, it did not work out and reflected this on my cron log.

Code:
Traceback (most recent call last):
  File "/home/pi/pi_surveillance.py", line 28, in <module>
    conf = json.load(open(args["conf"]))
IOError: [Errno 13] Permission denied: 'conf.json'
I am really desperate for a solution or a direction to where I should work towards!!

Last edited by browny redandy; 07-29-2015 at 03:25 AM.
 
Old 07-29-2015, 04:49 AM   #2
goumba
Senior Member
 
Registered: Dec 2009
Location: New Jersey, USA
Distribution: Debian, Arch
Posts: 1,164
Blog Entries: 7

Rep: Reputation: 331Reputation: 331Reputation: 331Reputation: 331
Use a full path to the conf file in your scripts, and give it a try. cron uses a minimal environment, so the script may not know where to find files.

Code:
#!/bin/bash
# launcher.sh
# activate the cv environment ,then execute
# python script

source $HOME/.profile 
workon cv

python  $HOME/pi_surveillance.py --conf $HOME/conf.json

Last edited by goumba; 07-29-2015 at 04:53 AM.
 
Old 07-29-2015, 05:19 AM   #3
browny redandy
LQ Newbie
 
Registered: Jul 2015
Posts: 3

Original Poster
Rep: Reputation: Disabled
How to find the full path of the path

How do one find the full path?
I tried
Code:
$ find "$(cd ..; pwd)" -name "conf.json"
It gives me
Code:
/home/pi/conf.json
The other qn is do I replace /home/pi with $HOME?

Sorry for the noob question. I am new to this.

Thanks!
 
Old 07-29-2015, 05:53 AM   #4
goumba
Senior Member
 
Registered: Dec 2009
Location: New Jersey, USA
Distribution: Debian, Arch
Posts: 1,164
Blog Entries: 7

Rep: Reputation: 331Reputation: 331Reputation: 331Reputation: 331
Quote:
Originally Posted by browny redandy View Post
How do one find the full path?
I tried
Code:
$ find "$(cd ..; pwd)" -name "conf.json"
It gives me
Code:
/home/pi/conf.json
There you go, you have the full path.

Quote:
The other qn is do I replace /home/pi with $HOME?

BTW,
Code:
find .. -name "conf.json"
would have been fine.

Sorry for the noob question. I am new to this.

Thanks!
$HOME and the tilde ~ are synonymous. I tend to use $HOME as it's a little clearer, doesn't get lost in other text. Either will expand to the user's home directory. in this case, /home/pi.
 
Old 07-29-2015, 06:18 AM   #5
browny redandy
LQ Newbie
 
Registered: Jul 2015
Posts: 3

Original Poster
Rep: Reputation: Disabled
One problem solved, the other arises

Thanks for your guidance so far! It worked well.
 
  


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