Write To /tmp Directory In Aws Lambda With Python

Goal I'm trying to write a zip file to the /tmp folder in a python aws lambda, so I can extract manipulate before zipping, and placing it in s3 bucket. Problem Os Errno30 Read Only

Solution 1:

extractAll() will extract files in the current directory, which is /var/task/test-deploy in your case.

You need to use os.chdir() to change the current directory:

import os, zipfile

os.chdir('/tmp')
with zipfile.ZipFile(source, 'r') asarchive:
    archive.extractall()

Even better, you can create a temporary directory and extract the files there, to avoid polluting /tmp:

import os, tempfile, zipfile

with tempfile.TemporaryDirectory() astmpdir:
    os.chdir(tmpdir)
    with zipfile.ZipFile(source, 'r') asarchive:
        archive.extractall()

If you want to restore the current working directory after extracting the file, consider using this decorator:

import os, tempfile, zipfile, contextlib

@contextlib.context_manager
def temporary_work_dir():
    old_work_dir = os.getcwd()
    with tempfile.TemporaryDirectory() as tmp_dir:
        os.chdir(tmp_dir)
        try:
            yieldfinally:
            os.chdir(old_work_dir)

withtemporary_work_dir():
    with zipfile.ZipFile(source, 'r') as archive:
        archive.extractall()