data volume permissions

[fsaintma]

Hi

When I launch your Docker image with a volume to map the JanusGraph data directory on my computer (the directory on my computer don't exist yet) I obtain this result and the storage is not initialized correctly

$ docker run --rm --name janusgraph-default -v ${PWD}/graph:/var/lib/janusgraph docker.io/janusgraph/janusgraph:latest
chown: changing ownership of '/var/lib/janusgraph': Operation not permitted
chmod: changing permissions of '/var/lib/janusgraph': Operation not permitted
waiting for storage...
waiting for storage...
waiting for storage...

$ ls -la
drwxr-xr-x  2 root     root      4096 mai   27 12:06 graph

The only workaround I found is to create/modify manually the directory before the Docker command with the good permissions (uid/gid = 999).
Could we have a directory initialized with the good permissions ?
Thanks for your help.
Best regards.

[FlorianHockmann]

What you describe sounds exactly like what a user described here on Stack Overflow in general for mounting a volume into a docker container where the host path doesn't exist yet: https://stackoverflow.com/questions/44574078/mount-non-existing-host-directory-into-non-root-container

The JanusGraph container runs as user janusgraph by default so the situation should be exactly as described in the SO post. So, the options suggested in the answer should also work with the JanusGraph container.

[fsaintma]

Hi thanks for your anwser.
I have just found a workaround for my need. I write my own Dockerfile which reference your image and install gosu. Finally in the docker-entrypoint.sh I replace your last line exec "$@"by exec /usr/local/bin/gosu janusgraph "$@". It works well and it creates a directory in case it doesn't exists with the right permissions.
Hope that it helps other users.
Thanks for your job and the janusgraph-docker project.
Best regards.