chown command doesn't exist on docker toolbox

expected behaviour

The VNC viewer should start without issue on Docker Toolbox. The command scbw.play shouldn’t required to work only with Docker for Windows(which require Hyper-V). The p

actual behaviour

scbw.play crash when performing while it chown doesn’t exist on docker toolbox for window.

There should be a workaround instead of using: COPY --chown=starcraft:users starcraft.zip $SC_DIR

I did a bit of search about the issue and found this. So maybe using usermod could fix this issue. RUN usermod -u 1000 $SC_DIR

steps to reproduce

$ scbw.play --bots "krasi0" "CherryPi" --log_level=DEBUG --show_all
INFO checking docker version
DEBUG Using docker API version b"'1.26'\n"
INFO checking docker can run
INFO checking docker has network sc_net
DEBUG docker network id: b'2335fa0e8d4b\n'
INFO checking if there is local image starcraft:game
DEBUG docker image id: b''
INFO creating docker local image
INFO copying files from c:\python\python36_64\lib\site-packages\scbw/local_docker to C:\Users\<myuser>\AppData\Roaming/scbw/docker
INFO building local image starcraft:game, this may take a while...
Sending build context to Docker daemon  105.7MB
Step 1/13 : FROM starcraft:java
 ---> 9a75b8b8f224
Step 2/13 : MAINTAINER Michal Sustr <[e-mail]>
 ---> Using cache
 ---> 0a0c8bc4abe9
Step 3/13 : USER starcraft
 ---> Using cache
 ---> ecedf151acef
Step 4/13 : WORKDIR $SC_DIR
 ---> Using cache
 ---> 6b99795e8a08
Step 5/13 : COPY --chown=starcraft:users starcraft.zip $SC_DIR
Unknown flag: chown
ERROR An error occurred while trying to build local image
Traceback (most recent call last):
  File "c:\python\python36_64\lib\site-packages\scbw\docker.py", line 123, in create_local_image
    raise DockerException()
scbw.error.DockerException

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\python\python36_64\lib\site-packages\scbw\cli.py", line 134, in main
    game_result = run_game(args)
  File "c:\python\python36_64\lib\site-packages\scbw\game.py", line 88, in run_game
    check_docker_requirements(args.docker_image)
  File "c:\python\python36_64\lib\site-packages\scbw\docker.py", line 162, in check_docker_requirements
    check_docker_has_local_image(image) or create_local_image()
  File "c:\python\python36_64\lib\site-packages\scbw\docker.py", line 128, in create_local_image
    raise DockerException(f"An error occurred while trying to build local image")
scbw.error.DockerException: An error occurred while trying to build local image

operating system

windows 10 note: i tried on ubuntu without issue

docker version

output of command docker version: $ docker version Client: Version: 17.07.0-ce API version: 1.26 (downgraded from 1.31) Go version: go1.8.3 Git commit: 8784753 Built: Tue Aug 29 17:41:05 2017 OS/Arch: windows/amd64

Server: Version: 1.13.1 API version: 1.26 (minimum version 1.12) Go version: go1.7.5 Git commit: 092cba3 Built: Wed Feb 8 08:47:51 2017 OS/Arch: linux/amd64 Experimental: false

scbw version

output of command scbw.play -v 0.2a19

[kant2002]

On Docker for Windows //c/ replacement works too.

[kant2002]

I could test both commands tomorrow morning, when I will be in the office (GMT+6). I run Docker for Windows so I would like to verify that C: replacement with //c/ will work for me.