how to invoke bash script with aws lambda function in python?

Question

I want to invoke a bash script with name myScript.sh in a newly created lambda function.

Step 1: I created a lambda function with name myLambda.py and the source code like:

import subprocess
print("start") 
subprocess.call("./myScript.sh")"

Step 2: Create a bash script with name myScript.sh under the same path with myLambda.py

Step 3: Click the test button and got the response:

{
  "errorMessage": "[Errno 13] Permission denied: './myScript.sh'"
}

Anybody knows how to deal with the permission denied issue in aws lambda function env?

Since the files are added as the guideline in https://docs.aws.amazon.com/lambda/latest/dg/code-editor.html, it's not helpful to use linux command "chmod +x " to change the file permission.

It's resolved by move myScript.sh to /tmp folder and add permission change command:

subprocess.run(["chmod", "+x", "/tmp/myScript.sh"])

jarmod · Accepted Answer · 2020-05-26 23:04:49Z

1

You can't execute scripts that don't have execute permission. You can supply execute permissions using some variant of:

chmod +x /somepath/myScript.sh

You can run this using your current subprocess approach. Run chmod before you run myScript.sh.

edited May 26, 2020 at 23:04

answered May 26, 2020 at 20:37

jarmod

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3 Comments

Deritha Over a year ago

Thanks for your reply. I add the myScript.sh with the guideline in docs.aws.amazon.com/lambda/latest/dg/code-editor.html. I don't know how to change the file permission over there since it's not saved in the local machine.

Deritha Over a year ago

Thank you very much for your prompt reply. Got read-only file system error after using "subprocess.run(["chmod", "+x", "/var/task/myScript.sh"])". It looks the file should under /tmp folder. Fix it by moving the file under /tmp folder.

user2500414 Over a year ago

Can you show your complete myLambda.py, this isnt working for me.

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