Volume inside another volume use www-data instead of root

Question

I'm using the following Dockerfile/docker-compose.yml.

I'm including the volume "vendor" inside the "/var/www" volume. The "vendor" folder is being created automatically when running the docker-compose file. But it gets created with chown "root:root", while all other folders inside "/var/www" chowned to "www-data:www-data".

Any idea how I can fix it so that the "vendor" volume is also chowned by www-data by default?

Dockerfile

...
RUN usermod -u 1000 www-data && groupmod -g 1000 www-data
...

docker-compose.yml:

volumes:
    - ./:/var/www
    - vendor:/var/www/vendor

volumes:
  vendor:

"ls -la" on the "/var/www" shows the following:

drwxr-xr-x 2 www-data www-data    0 Mar 15 20:40 .
drwxr-xr-x 2 www-data www-data 4096 Mar 15 20:28 ..
drwxr-xr-x 2 www-data www-data    0 Mar 15 20:42 test
drwxr-xr-x 2 root     root     4096 Mar 15 20:38 vendor

Answer 1

Yes, you can use workaround, just create folder in Dockerfile, permission will be saved, as an example:

Dockerfile

FROM caa06d9c/support

RUN mkdir /var/www/ && chown 1000:1000 /var/www

CMD [ "sleep", "9999" ]

Docker Compose version: "3.2"

services:
    srv:
        image:  temp
        volumes:
            - vendor:/var/www/

volumes:
    vendor:

Output

drwxr-xr-x    3 root     root          4096 Jul  5  2018 spool
drwxrwxrwt    2 root     root          4096 Jul  5  2018 tmp
drwxr-xr-x    2 1000     1000          4096 Mar 15 21:06 www