`depends_on` `post_start_completed_successfully`

[stormshield-gt]

Description

Since #12166 we have the post_start hook. A use case I have for this is to run some initialization code after the container starts. It will be great that other services than depend on the initialization code only start when it's completed successfully.
I don't know if it's planned but maybe we could have something like this:

depends_on:
  db:
    condition: post_start_completed_successfully

[idsulik]

It will be great that other services than depend on the initialization code only start when it's completed successfully.

it should work in this way not).

services:
  app1:
    image: alpine
    command: echo 'app1 is completed'
    depends_on:
      - app2
  app2:
      image: alpine
      command: ["sh", "-c", "sleep 10 && echo 'app2 is completed'"]
      post_start:
        - command: ["sh", "-c", "sleep 5 && echo 'app2 post start hook executed'"]

output:

[+] Running 2/0
 ✔ Container tmp-app2-1  Created                                                                                                                                                                                                0.0s 
 ✔ Container tmp-app1-1  Created                                                                                                                                                                                                0.0s 
Attaching to app1-1, app2-1
app2-1 ->  | app2 post start hook executed
app1-1     | app1 is completed
app1-1 exited with code 0
app2-1     | app2 is completed
app2-1 exited with code 0

[ndeloof]

Indeed, until there's a bug in our codebase, dependent service should only start after post_start hooks have been ran.

[ndeloof]

Closing issue, please comment or open a new issue if you have more context to share on this