ERROR: Cannot locate specified Dockerfile

[jmthvt]

Description of the issue

Since version 1.20.0, compose fails to locate a dockerfile out of the build context. It worked before, and is allowed since Docker 18.03 docker/cli#886

Context information (for bug reports)

docker-compose version 1.20.1, build 5d8c71b

Client:
 Version:	18.03.0-ce
 API version:	1.37
 Go version:	go1.9.4
 Git commit:	0520e24
 Built:	Wed Mar 21 23:06:22 2018
 OS/Arch:	darwin/amd64
 Experimental:	false
 Orchestrator:	swarm

Server:
 Engine:
  Version:	18.03.0-ce
  API version:	1.37 (minimum version 1.12)
  Go version:	go1.9.4
  Git commit:	0520e24
  Built:	Wed Mar 21 23:14:32 2018
  OS/Arch:	linux/amd64
  Experimental:	true

networks:
  devops-test: {}
services:
  devops-test:
    build:
      context: /Users/johndoe/repos/test/devops-test/src
      dockerfile: /Users/johndoe/repos/test/devops-test/Dockerfile
    environment:
    image: repo.dkr.ecr.eu-west-1.amazonaws.com/devops-test
    networks:
      devops-test: null
version: '3.0'

Steps to reproduce the issue

1. Just run docker-compose build with a Dockerfile out of the context.

Observed result

./docker-compose-1.20.1 -f tools/docker/docker-compose.yml build
Building devops-test
ERROR: Cannot locate specified Dockerfile: /Users/johndoe/repos/test/devops-test/Dockerfile
./docker-compose-1.20.0 -f tools/docker/docker-compose.yml build
Building devops-test
ERROR: Cannot locate specified Dockerfile: /Users/johndoe/repos/test/devops-test/Dockerfile

Expected result

./docker-compose-1.19.0 -f tools/docker/docker-compose.yml build
Building devops-test
Step 1/21 : FROM alpine:3.7
3.7: Pulling from library/alpine

Stacktrace / full error message

(if applicable)

Additional information

macOS 10.13.3

[shin-]

Thank you for the report!

If this worked before, it was definitely by accident, but I agree that we should keep up with the changes in the engine and support this as well. We'll prioritize accordingly!

[jmthvt]

@shin- I'm getting the same error with docker-compose 1.21.0
docker-compose version 1.21.0, build unknown

[shin-]

Make sure you have the latest version of the docker package

[jmthvt]

That's the case:

docker --version
Docker version 18.04.0-ce, build 3d479c0

[shin-]

The Python package, not the Docker engine.

[jmthvt]

pip show docker
Name: docker
Version: 3.2.1
Summary: A Python library for the Docker Engine API.
Home-page: https://github.com/docker/docker-py
Author: Joffrey F
Author-email: joffrey@docker.com
License: Apache License 2.0
Location: /usr/local/lib/python2.7/site-packages

[shin-]

I'm not able to reproduce with a similar test case:

$ tree
.
├── build
│   └── etc.txt
├── dockerfile
│   └── Dockerfile.test
└── tools
    └── docker
        └── docker-compose.yml

4 directories, 3 files
$ docker-compose -f tools/docker/docker-compose.yml config
networks:
  devops-test: {}
services:
  test:
    build:
      context: /home/joffrey/work/tests/compose/repro5823/build
      dockerfile: /home/joffrey/work/tests/compose/repro5823/dockerfile/Dockerfile.test
    command: cat /src/etc.txt
    networks:
      devops-test: null
version: '3.0'

$ docker-compose -f tools/docker/docker-compose.yml build --no-cache 
Building test
Step 1/2 : FROM alpine
 ---> 3fd9065eaf02
Step 2/2 : COPY . /src
 ---> 8df304d51bdf
Successfully built 8df304d51bdf
Successfully tagged docker_test:latest

Is there anything I'm missing that would account for the discrepancy? Are you seeing the same result with the binary distribution?

[jmthvt]

OK, I think I have isolated the issue.

This test case works, which is context and dockerfile in different folders:

services:
  devops-test:
    build:
      context: /Users/johndoe/repos/test/devops-test/
      dockerfile: /Users/johndoe/repos/test/devops-test/Dockerfile

But now it's failing when the dockerfile is in the context or context's subfolder!

services:
  devops-test:
    build:
      context: /Users/johndoe/repos/test/devops-test/
      dockerfile: /Users/johndoe/repos/test/devops-test/Dockerfile

Building devops-test
ERROR: Cannot locate specified Dockerfile /Users/johndoe/repos/test/devops-test/Dockerfile

services:
  devops-test:
    build:
      context: /Users/johndoe/repos/test/devops-test/
      dockerfile: /Users/johndoe/repos/test/devops-test/dockerfile/Dockerfile

Building devops-test
ERROR: Cannot locate specified Dockerfile /Users/johndoe/repos/test/devops-test/dockerfile/Dockerfile

The Dockerfile is being looked up if unspecified in compose, but this is still an issue if you need an alternate Dockerfile.

[jmthvt]

I will open a dedicated issue.
#5869

[kavir-bheeroo]

I am getting the Cannot locate specified Dockerfile when switching to the Docker Edge version.

• docker-compose version 1.21.2, build a133471
• docker-py version: 3.3.0

Switching back to the Stable builds works fine.

Excerpt of my docker-compose.yml file:

build:
      context: .
      dockerfile: ./src/Services/Roster.API/Dockerfile

[shin-]

#5969