Thanks so much for sharing your work! I gave this a try, but after I initially was super happy how well it worked I realised an issue related to watching files that are mounted from the host. I am unsure whether I am simply not using the right mount options or whether what I am trying to do will not work. Our use case is to mount a source directory with -v on docker run, and having a webpack-dev-server running in the container. Whenever a file is changed in the source directory, the dev server should recompile, which it doesn't.

To reproduce (without webpack-dev-server, just using inotifywait):

test.txt

test text

test.sh

#!/bin/sh
while inotifywait test.txt; do
  echo "file changed"
done

Dockerfile

FROM ubuntu:18.04

RUN apt-get update -qq && apt-get install -qq -y --no-install-recommends \
    inotify-tools

WORKDIR /home

CMD chmod +x test.sh && ./test.sh

• build docker image docker build -t mobytest .
• run docker container with pwd mounted docker run -it --rm -v $(pwd):/home mobytest:latest --> watches should be established, leave open
• test from host: echo "host waz here" > test.txt --> no file change detected, cat test.txt in container shows change has in fact been made
• test from within container: echo "docker waz here" > test.txt --> file change detected

What I have tried

• docker-machine-nfs ${VMNAME} --mount-opts="noacl,async,noatime,actimeo=1,nfsvers=3" (same as from install.sh)
• docker-machine-nfs ${VMNAME} --mount-opts="noacl,async,nolock,vers=3,udp,noatime,actimeo=2"(from this article)
• removing async option
• setting sync option
• setting shared folder to actual source directory

any help would be greatly appreciated :)