Fix the following issue:
EODataAccessGateway constructor fails on AWS Lambda Describe the bug
makedirs invocation within the EODataAccessGateway constructor causes OSError: [Errno 30] Read-only file system when run on AWS Lambda
Code To Reproduce CLI commands or Python code snippet to reproduce the bug. Please use maximum verbosity using:
from aws_lambda_powertools.logging import Logger
from aws_lambda_powertools.tracing import Tracer
from eodag import EODataAccessGateway
logger = Logger()
tracer = Tracer()
@tracer.capture_lambda_handler
@logger.inject_lambda_context
def lambda_handler(event, context):
EODataAccessGateway()
Output Compete output obtained with maximal verbosity.
[ERROR] OSError: [Errno 30] Read-only file system: '/home/sbx_user1051'
Traceback (most recent call last):
File "/opt/python/aws_lambda_powertools/tracing/tracer.py", line 305, in decorate
response = lambda_handler(event, context, **kwargs)
File "/opt/python/aws_lambda_powertools/logging/logger.py", line 438, in decorate
return lambda_handler(event, context, *args, **kwargs)
File "/var/task/<my file, my line>, in lambda_handler
EODataAccessGateway()
File "/opt/python/eodag/api/core.py", line 91, in __init__
makedirs(self.conf_dir)
File "/opt/python/eodag/utils/__init__.py", line 496, in makedirs
os.makedirs(dirpath)
File "/var/lang/lib/python3.9/os.py", line 215, in makedirs
makedirs(head, exist_ok=exist_ok)
File "/var/lang/lib/python3.9/os.py", line 215, in makedirs
makedirs(head, exist_ok=exist_ok)
File "/var/lang/lib/python3.9/os.py", line 225, in makedirs
mkdir(name, mode)
Environment:
- Python version: 3.9
- EODAG version: 2.5.2
- Runtime: AWS Lambda
Additional context
File system on AWS Lambda is read-only. It has "ephemeral storage" that could be accessed in /tmp (1, 2), however this class does not accept any configuration to where to point to makedirs.
The workaround that heavily relies on the current implementation is to change $HOME env var before invoking the constructor. But it is barely acceptable and extremely inconvenient, since this variable is used by many tools locally and in automated tools along the way.