Share a directory (volume) among several services

General
1

First of all here is my scenario

$ tree -a
├── 1.yml
├── 2.yml
└── .env

$ cat .env 
COMPOSE_FILE=1.yml:2.yml

$ cat 1.yml 
services:
    myservice1:
        image: bash
        depends_on:
            - myservice2

$ cat 2.yml 
services:
    myservice2:
        image: bash
        volumes:
            - ./dir:/dir

Let’s do some tests

$ docker compose run --rm myservice1 ls -ld /dir
ls: /dir: No such file or directory

mmmhhh…

$ docker compose run --rm myservice2 ls -ld /dir
drwxr-xr-x    2 root     root          4096 Jul 23 07:09 /dir

Ok, but … practically myservice1 cannot access to the directory /dir of myservice2 (it can only be done from the inside of myservice2).

What can be done?
What can be done to share a directory, or more generally, a volume among several services?

Practically the directive (specified in the 1.yml file)

        depends_on:
            - myservice2

it didn’t help …

2

depends_on means myservice2 must be running in order for myservice1 to run

You’re thinking of

extends:
  file: 2.yml
  service: myservice2
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