Minikube Filesystem Bug Repro

This project is a repro of a bug that occurs when mounting volumes with Minikube/xhyve.

Environment

• OS: Mac OS Sierra - 10.12.5
• VM Driver: xhyve - stable 0.3.3
• Minikube version: 0.21.0

Steps to Repro

1. Make sure you have Minikube running and are using the xhyve VM driver

   $ brew install minikube
   $ brew install docker-machine-driver-xhyve # make sure to follow additional instructions if installing for the first time
   $ minikube start --vm-driver=xhyve
   

2. Run ./repro.sh to build the Dockerfile. It copies the watch-mounted-events binary into the image and runs it. It uses the example from the fsnotify project to detect and log any changes to the /app/mounted directory in the container. repro.sh also runs the image in a container and mounts the local mounted directory to the /app/mounted directory in the container. It then runs watch-mounted-events and attaches to the container's output.

3. In your local filesystem, create any file or directory inside of the mounted directory. e.g. touch ./mounted/newfile

What you expect to happen: fsnotify should detect and log changes to the mounted volume to STDOUT.

What actually happens: fsnotify doesn't detect any changes to the mounted volume coming from the host filesystem. However, you can assert that the file changes are propagating through to the container by bashing into the container:

# create file locally
touch mounted/foo.txt 

# bash into the container
docker exec -it repro-fs-reloading /bin/bash

# inside the container
ls /app/mounted

# prove that FS events are shown when shelled into the container (i.e. not through the volume mounting)
touch /app/mounted/anything

# You should see an event, unlike when you create/change/delete files through the mount.

Running ls /app/mounted inside the container, you should see that foo.txt exists inside the container. However the event was not recorded.

The filesystem events are also dropped when using minikube mount ... to mount the directory, instead of using the default mount setup in the xhyve VM's /Users dir.