How can I clean the cache before the execution?

There are a handful of special environment variables that affect the behavior of the Valohai execution agent.

You can add a new environment variable to an execution when you create it. The environment variables mentioned below define which cache to clean (data, docker, or all)

VH_NO_DATA_CACHE

Setting this to a true value (1, yes, true) will have the execution agent ignore any pre-existing cached data. This is useful if you have reused the same URL for a given datum (which, for reproducibility reasons, you should not generally do). The 

datum will still be written to the agent machine’s local cache.

VH_NO_IMAGE_CACHE

Setting this to a true value (1, yes, true) will have the execution agent ignore existing Docker images and force pulling them anew from the source.

VH_CLEAN

Setting this to a true value (1, yes, true) will have the execution agent forcibly clean all Docker images and cached data off the agent machine before and after the execution. This will take additional time.