Can't execute shell script from python subprocess: permission denied

25
votes

Tried googling but couldn't find something that relates to my particular problem. I'm trying to run a shell script from python but the shell script wouldn't run because of a permission denied error. The python code I'm running is:

process = subprocess.Popen('run.sh', shell=True, stdout=subprocess.PIPE)
process.wait()
....
os.killpg(pro.pid, signal.SIGTERM)

The error I'm getting:

python RunScript.py "input"
/bin/sh: 1: run.sh: Permission denied

The contents of my shell script is:

#!/bin/sh
abspath=$(cd "$(dirname "$0")"; pwd)
CLASSPATH=$CLASSPATH:$abspath/"lib/*":$abspath/"bin"
export CLASSPATH
java -classpath $CLASSPATH my.folder.path.Class $abspath/../data/data.txt $abspath/../data/data2.txt

Thanks in advance.

2
pythonshell
don't use PIPE unless you read/write from/to the pipe. It blocks subprocess if it generates enough output. To discard output, you could redirect it to os.devnull - jfs
you probably need preexec_fn=os.setsid if you are going to use os.killpg() - jfs

2 Answers

33
votes

Check your run.sh mode, if no executable flag, set it with command 

chmod +x run.sh
1
votes

its because you don't have permission to run that script. You will need to give executable permission for that script to run.

chmod a+x run.sh