Ability to bind a folder that already has an existing data and folder structure without changing ownership permissions on the existing folder.

[jerrywoo96]

Hello,

I would like to use ownCloud with an existing folder structure with existing data inside the folder. However, I am unable to find a configuration that works for me.

Here are the attempts that I tried:

1. Setting user: to 0:65540 allows creation of necessary files and folders in /mnt/data and create symbolic link to /var/www/owncloud/custom. But it tries to change the ownership of the files and folders in /EXISTING_FOLDER_WITH_DATA which is NOT what I want.

2. Setting user: to 1026:65540 and changing ownership of /mnt/data to 1026:65540, permission to 775 prevents creating a symbolic link for /var/www/owncloud/custom.

services:
  ownCloud:
    container_name: ownCloud
    hostname: ownCloud
    image: owncloud/server:latest
    user: "1026:65540"
    environment:
      OWNCLOUD_DOMAIN: ''
      OWNCLOUD_TRUSTED_DOMAINS: 'owncloud.example.com'
      OWNCLOUD_ADMIN_USERNAME: ${USERNAME}
      OWNCLOUD_ADMIN_PASSWORD: ${PASSWORD}
    volumes:
    - ${DOCKERFOLDER}/ownCloud/mnt/data:/mnt/data:rw
    - /EXISTING_FOLDER_WITH_DATA:/mnt/data/files/Jerry/files/EXISTING_FOLDER_WITH_DATA:ro # /EXISTING_FOLDER_WITH_DATA is owned by `1026:100` with permissions `755`.

Things to Note:
uid 0 and uid 1026 are members of gid 65540.

Goal/Objective:
To be able to access /EXISTING_FOLDER_WITH_DATA in ownCloud WebApp without changing permissions of files and folders within /EXISTING_FOLDER_WITH_DATA.