For local development with appengine, I need to change where uploaded images are stored with the GCS service so that they are persisted across builds. Right now, a new build wipes out the target directory along with the images in the appengine-generated directory.
I had the same problem with the datastore but was able to fix this by setting a property to use a datastore located in my repo outside of the target directory.
-Ddatastore.backing_store=../../local_db.bin
Is there a comparable property for the images/files saved using the GCS service?
As @alex pointed out, there is a parameter to define where all local files are stored for python and it exists for java too.
For java the parameter is --generated_dir=<path> which is a server param not a JVM option.
Also note that this overwrites the usage of -Ddatastore.backing_store=<local_db.bin>.
There documentation on this feature here: https://cloud.google.com/appengine/docs/java/tools/devserver?hl=en