`compose config` removes needed quotes, resulting in ".UnicodeDecodeError 'utf8-8' codec can't decode

[rfay]

Description

docker-compose config removes required yaml quoting

For example, a value - 'X=somevalue will be transformed by docker-compose config to - X=somevalue, with no quotes.

This is not a problem with simple values, but becomes a problem with utf-8 values, like 'André Kraus' or 'Mück' and you end up with invalid yaml.

This problem exists in both docker-compose v1 and docker-compose v2, all versions AFAICT

Steps to reproduce the issue:

Use this docker-compose.yaml:

services:
  web:
    image: busybox
    environment:
      - 'SOMEENV=André Kraus'

docker-compose config (either v1 or v2) will transform it to

services:
  web:
    environment:
      SOMEENV: André Kraus
    image: busybox
    networks:
      default: null
networks:
  default:
    name: ddev_default

which for some values of SOMEENV will result in invalid yaml and ".UnicodeDecodeError 'utf8-8' codec can't decode"

Describe the results you received:

Invalid yaml due to removal of quotes

Describe the results you expected:

Why not keep the quotes on there?

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker-compose --version:

All versions, 1 and 2

I have tested this on Windows to get failure with this setup.

• docker-compose v2.0.0-rc.1 gets "yaml: invalid trailing UTF-8 octet" when you try to use docker-compose -f dc.yaml up with a file created by docker-compose conf > dc.yaml
• docker-compose 1.29.2 with docker-compose config >dc.yaml and docker-compose -f dc.yaml up gets ".UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe9 in position 56: invalid continuation byte"

On macOS I get other problems, but not a complete failure like this.

Anyway, leave the quotes on!

[rfay]

@ulyssessouza do you think there's any way to get this fixed in docker-compose v1, or is it abandonware? Should I open an issue there?