Got UnicodeDecodeError when docker-compose.yml file encoding differ terminal encoding under windows

[kamichidu]

Description of the issue

docker-compose expects docker-compose.yml is same file encoding with terminal encoding.
It should detect by file content or use utf8 (not same with terminal encoding, at least).

When I change utf8 to cp932 of docker-compose.yml file encoding, this bug is not occurred.

Context information (for bug reports)

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:    0520e24
 Built: Wed Mar 21 23:06:28 2018
 OS/Arch:       windows/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

Output of "docker-compose config"
Traceback (most recent call last):
  File "docker-compose", line 6, in <module>
  File "compose\cli\main.py", line 71, in main
  File "compose\cli\main.py", line 121, in perform_command
  File "compose\cli\main.py", line 329, in config
  File "compose\cli\command.py", line 67, in get_config_from_options
  File "compose\config\config.py", line 283, in find
  File "compose\config\config.py", line 283, in <listcomp>
  File "compose\config\config.py", line 183, in from_filename
  File "compose\config\config.py", line 1434, in load_yaml
  File "site-packages\yaml\__init__.py", line 94, in safe_load
  File "site-packages\yaml\__init__.py", line 70, in load
  File "site-packages\yaml\loader.py", line 24, in __init__
  File "site-packages\yaml\reader.py", line 85, in __init__
  File "site-packages\yaml\reader.py", line 124, in determine_encoding
  File "site-packages\yaml\reader.py", line 178, in update_raw
UnicodeDecodeError: 'cp932' codec can't decode byte 0x83 in position 19: illegal multibyte sequence
[11180] Failed to execute script docker-compose

Steps to reproduce the issue

1. chcp 932 in cmd.exe/powershell.exe
2. Creating docker-compose.yml with utf8 encoding and contains multi-byte characters
3. Do docker-compose ps and many commands reading docker-compose.yml

Observed result

Got python exception below:

Traceback (most recent call last):
  File "docker-compose", line 6, in <module>
  File "compose\cli\main.py", line 71, in main
  File "compose\cli\main.py", line 121, in perform_command
  File "compose\cli\main.py", line 329, in config
  File "compose\cli\command.py", line 67, in get_config_from_options
  File "compose\config\config.py", line 283, in find
  File "compose\config\config.py", line 283, in <listcomp>
  File "compose\config\config.py", line 183, in from_filename
  File "compose\config\config.py", line 1434, in load_yaml
  File "site-packages\yaml\__init__.py", line 94, in safe_load
  File "site-packages\yaml\__init__.py", line 70, in load
  File "site-packages\yaml\loader.py", line 24, in __init__
  File "site-packages\yaml\reader.py", line 85, in __init__
  File "site-packages\yaml\reader.py", line 124, in determine_encoding
  File "site-packages\yaml\reader.py", line 178, in update_raw
UnicodeDecodeError: 'cp932' codec can't decode byte 0x83 in position 19: illegal multibyte sequence
[11180] Failed to execute script docker-compose

Expected result

No exception and proceed a command

Stacktrace / full error message

Traceback (most recent call last):
  File "docker-compose", line 6, in <module>
  File "compose\cli\main.py", line 71, in main
  File "compose\cli\main.py", line 121, in perform_command
  File "compose\cli\main.py", line 329, in config
  File "compose\cli\command.py", line 67, in get_config_from_options
  File "compose\config\config.py", line 283, in find
  File "compose\config\config.py", line 283, in <listcomp>
  File "compose\config\config.py", line 183, in from_filename
  File "compose\config\config.py", line 1434, in load_yaml
  File "site-packages\yaml\__init__.py", line 94, in safe_load
  File "site-packages\yaml\__init__.py", line 70, in load
  File "site-packages\yaml\loader.py", line 24, in __init__
  File "site-packages\yaml\reader.py", line 85, in __init__
  File "site-packages\yaml\reader.py", line 124, in determine_encoding
  File "site-packages\yaml\reader.py", line 178, in update_raw
UnicodeDecodeError: 'cp932' codec can't decode byte 0x83 in position 19: illegal multibyte sequence
[11180] Failed to execute script docker-compose

Additional information

OS Version:
Windows 10 Pro, 10.0.16299 Build 16299

docker-compose install method:
Binary from github release page
and docker ce for windows installer (stable channel) from docker store

chcp outputs:

Active code page: 932

[shin-]

Thanks for the report!