Build image if "--build" is passed, alternatively pull image from registry

[chrispader]

Feature Request: Build image if --build is passed, alternatively pull image from registry

I don't know if this is working yet, but it would be a great feature, if you could toggle between building a image and pulling it from the registry.

So what i mean is that if you provide the --build parameter, docker compose should build the image from a Dockerfile, and if no --build is passed, the registry image (image: registry.docker.com/bla) will be used.

So for example i would use this docker-compose.yml file:

version: '3.0'
services:
  devserver:
    image: registry.docker.com/superspecialdevserver
    build: docker/devserver
    restart: always
    container_name: devserver

And the Dockerfile would be sitting in docker/devserver

Output of "docker-compose version"

docker-compose version 1.20.1, build 5d8c71b2
docker-py version: 3.1.4
CPython version: 3.6.4
OpenSSL version: OpenSSL 1.0.2k  26 Jan 2017

Output of "docker version"

Client:
 Version:       18.03.0-ce
 API version:   1.37
 Go version:    go1.9.4
 Git commit:    0520e24302
 Built: Fri Mar 23 08:31:36 2018
 OS/Arch:       windows/amd64
 Experimental:  false
 Orchestrator:  swarm

Server:
 Engine:
  Version:      18.05.0-ce
  API version:  1.37 (minimum version 1.12)
  Go version:   go1.10.1
  Git commit:   f150324
  Built:        Wed May  9 22:20:42 2018
  OS/Arch:      linux/amd64
  Experimental: false

[gbraad]

What you propose changes existing behaviour, right?

If you use

build: ./dir
image: webapp:tag

It instructs to build from the specified ./dir, and tag the image as image: webapp:tag Ref. Your proposed solution would in that case ignore the build and pull the image instead, UNLESS the option --build is given? This would break current expectation and implementations.

[chrispader]

Maybe there is an alternative way of implementing this feature. So that you can choose between pulling and building the image. Maybe over an extra option?

Something like:

build: ./dir
image: webapp:tag
pullImage: registry.docker.com/webapp:latest

And then you could run something like docker-compose up -d --pull?

[zerkz]

Don't believe this is up for being implemented.

See this related issue: #3574

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