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I have a zip file on S3. I need to use /tmp folder of a Lambda for lazy-loading that I am using to store the zip file and then I need the folder to contain the unzipped contents. I am using Python for the operations. Below is the code:

import sys
import zipfile
import subprocess

s3 = boto3.resource('s3')
s3.meta.client.download_file('bucket', 'dependencies/dependencies.zip', '/tmp/dependencies.zip')

output = subprocess.check_output('unzip /tmp/dependencies.zip -d /tmp/')
print("Output: ", output.decode('utf-8'))

I am getting the error: No such file or directory: 'unzip /tmp/dependencies.zip -d /tmp/': 'unzip /tmp/dependencies.zip -d /tmp/' Unknown application error occurred

I have my code outside the lambda_handler() for cold-start. From this I not even sure that the zipped file has been copied to /tmp directory since that line didn't throw any error, and also I am not able to unzip the contents. I tried removing the / in front of tmp and that didn't help either. Where am I going wrong?

Nagarajan Shanmuganathan
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1 Answers1

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First thing is to confirm that the file has been downloaded (How to Check if a File Exists in Python – dbader.org).

The problem might be that the sub-process can't find unzip.

I notice you have imported zipfile, so you could that library to unzip. From Unzipping files in python:

import zipfile
with zipfile.ZipFile('/tmp/dependencies.zip', 'r') as zip_ref:
    zip_ref.extractall('/tmp/')
John Rotenstein
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