Support using EFS for storage

[shawnjohnson]

The new EFS storage feature for Lambda opens up some interesting options to work around the Large file issue, as well as virus definitions. We are currently trying to figure out a way around running out of space while scanning a 300 MB file. It seems like it could be possible to change the code around this line to allow an alternative path to be provided, perhaps via new configuration option?

[jny986]

I would also like to see the use of EFS for both file storage for scanning as well as for the storage of virus definitions.

[shawnjohnson]

@jny986 - I am curious what the use case for storing virus definitions on EFS would be? The path for virus definitions is already an Configuration option with the AV_DEFINITION_PATH Environment variable. I imagine you could use that now without any code changes?

[tengfone]

Hi @shawnjohnson , did you manage to route the path to EFS storage instead of using the tmp lambda storage? Thanks

[shawnjohnson]

@tengfone - We added the ability to override the default path of /tmp. Then the Lambda function is configured with an EFS volume, and the path is specified as an Environment variable (AV_SCAN_PATH). Here is the bulk of the changes made - erulemaking@39a9862

[tengfone]

@shawnjohnson Thank you v much! Will be using that!

[robbrad]

Can this be PR'ed into the main repo - seams like a great addition