Mounting fails if too many files are in VFS cache

[miwig]

Rclone calls Cache.reload on startup, to check if any files from the VFS cache have to be uploaded. Since this talks to the remote, it can take a long time. After the default --daemon-wait setting of one minute, rclone exits and mounting fails. Increasing --daemon-wait leads to a gRPC timeout after 2 minutes, also causing Kubernetes to see the mount as failed, while the rclone process still exists and now never exits, because NodeUnpublishVolume is never called.

Not running with --daemon and managing the child process manually, as seen here might be a good idea (though it requires checking that the mount was successful), but can't really solve this problem, because we still have to finish mounting before the 2 minute gRPC timeout hits us.

It seems to me that the only solution is to start with a fresh cache each time, which brings its own problems, i.e. data loss.