Python subprocess call through crontab not working
I am using a python 3.6 script in a Raspberry Pi Zero W that contains the following lines:
import subprocess
result = subprocess.run(['which', 'node'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
nodeCmd = result.stdout.decode("utf-8").replace('n', '')
print(nodeCmd)
result = subprocess.run([nodeCmd, './script.js'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
The script tries to find the node binary and make a call to a js script. When ran manually, the program works OK, but when I schedule the call through crontab, the nodeCmd variable appears blank (instead of /usr/local/bin/node) and I get the following error:
[Errno 13] Permission denied: ''
What is going on here? Is this a permissions issue?
node.js python-3.x cron
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
add a comment |
I am using a python 3.6 script in a Raspberry Pi Zero W that contains the following lines:
import subprocess
result = subprocess.run(['which', 'node'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
nodeCmd = result.stdout.decode("utf-8").replace('n', '')
print(nodeCmd)
result = subprocess.run([nodeCmd, './script.js'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
The script tries to find the node binary and make a call to a js script. When ran manually, the program works OK, but when I schedule the call through crontab, the nodeCmd variable appears blank (instead of /usr/local/bin/node) and I get the following error:
[Errno 13] Permission denied: ''
What is going on here? Is this a permissions issue?
node.js python-3.x cron
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
please check stackoverflow.com/questions/39777345/…
– Sach
Nov 23 '18 at 9:24
What's the result ofsudo which node? Is node installed at the system level or inside$HOME/.nvm?
– JoseKilo
Nov 23 '18 at 9:25
@JoseKilo /usr/local/bin/node
– derkomai
Nov 23 '18 at 9:29
@Sach I see, but should I give 'script.js' execution permissions? I though that was not neccesary as the script is running trhough node.
– derkomai
Nov 23 '18 at 9:30
add a comment |
I am using a python 3.6 script in a Raspberry Pi Zero W that contains the following lines:
import subprocess
result = subprocess.run(['which', 'node'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
nodeCmd = result.stdout.decode("utf-8").replace('n', '')
print(nodeCmd)
result = subprocess.run([nodeCmd, './script.js'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
The script tries to find the node binary and make a call to a js script. When ran manually, the program works OK, but when I schedule the call through crontab, the nodeCmd variable appears blank (instead of /usr/local/bin/node) and I get the following error:
[Errno 13] Permission denied: ''
What is going on here? Is this a permissions issue?
node.js python-3.x cron
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
I am using a python 3.6 script in a Raspberry Pi Zero W that contains the following lines:
import subprocess
result = subprocess.run(['which', 'node'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
nodeCmd = result.stdout.decode("utf-8").replace('n', '')
print(nodeCmd)
result = subprocess.run([nodeCmd, './script.js'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
The script tries to find the node binary and make a call to a js script. When ran manually, the program works OK, but when I schedule the call through crontab, the nodeCmd variable appears blank (instead of /usr/local/bin/node) and I get the following error:
[Errno 13] Permission denied: ''
What is going on here? Is this a permissions issue?
node.js python-3.x cron
node.js python-3.x cron
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
asked Nov 23 '18 at 9:21
derkomaiderkomai
299315
299315
please check stackoverflow.com/questions/39777345/…
– Sach
Nov 23 '18 at 9:24
What's the result ofsudo which node? Is node installed at the system level or inside$HOME/.nvm?
– JoseKilo
Nov 23 '18 at 9:25
@JoseKilo /usr/local/bin/node
– derkomai
Nov 23 '18 at 9:29
@Sach I see, but should I give 'script.js' execution permissions? I though that was not neccesary as the script is running trhough node.
– derkomai
Nov 23 '18 at 9:30
add a comment |
please check stackoverflow.com/questions/39777345/…
– Sach
Nov 23 '18 at 9:24
What's the result ofsudo which node? Is node installed at the system level or inside$HOME/.nvm?
– JoseKilo
Nov 23 '18 at 9:25
@JoseKilo /usr/local/bin/node
– derkomai
Nov 23 '18 at 9:29
@Sach I see, but should I give 'script.js' execution permissions? I though that was not neccesary as the script is running trhough node.
– derkomai
Nov 23 '18 at 9:30
please check stackoverflow.com/questions/39777345/…
– Sach
Nov 23 '18 at 9:24
please check stackoverflow.com/questions/39777345/…
– Sach
Nov 23 '18 at 9:24
What's the result of
sudo which node ? Is node installed at the system level or inside $HOME/.nvm ?– JoseKilo
Nov 23 '18 at 9:25
What's the result of
sudo which node ? Is node installed at the system level or inside $HOME/.nvm ?– JoseKilo
Nov 23 '18 at 9:25
@JoseKilo /usr/local/bin/node
– derkomai
Nov 23 '18 at 9:29
@JoseKilo /usr/local/bin/node
– derkomai
Nov 23 '18 at 9:29
@Sach I see, but should I give 'script.js' execution permissions? I though that was not neccesary as the script is running trhough node.
– derkomai
Nov 23 '18 at 9:30
@Sach I see, but should I give 'script.js' execution permissions? I though that was not neccesary as the script is running trhough node.
– derkomai
Nov 23 '18 at 9:30
add a comment |
1 Answer
1
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oldest
votes
So the reason seems to be that crontab has the $PATH variable set to a different value from the user $PATH. To fix it, I just had to set the wanted value in the cron file, just above the schedule lines:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
add a comment |
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1 Answer
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
So the reason seems to be that crontab has the $PATH variable set to a different value from the user $PATH. To fix it, I just had to set the wanted value in the cron file, just above the schedule lines:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
add a comment |
So the reason seems to be that crontab has the $PATH variable set to a different value from the user $PATH. To fix it, I just had to set the wanted value in the cron file, just above the schedule lines:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
add a comment |
So the reason seems to be that crontab has the $PATH variable set to a different value from the user $PATH. To fix it, I just had to set the wanted value in the cron file, just above the schedule lines:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
So the reason seems to be that crontab has the $PATH variable set to a different value from the user $PATH. To fix it, I just had to set the wanted value in the cron file, just above the schedule lines:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
answered Nov 23 '18 at 18:27
derkomaiderkomai
299315
299315
add a comment |
add a comment |
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please check stackoverflow.com/questions/39777345/…
– Sach
Nov 23 '18 at 9:24
What's the result of
sudo which node? Is node installed at the system level or inside$HOME/.nvm?– JoseKilo
Nov 23 '18 at 9:25
@JoseKilo /usr/local/bin/node
– derkomai
Nov 23 '18 at 9:29
@Sach I see, but should I give 'script.js' execution permissions? I though that was not neccesary as the script is running trhough node.
– derkomai
Nov 23 '18 at 9:30