docker run --entrypoint bug under MINGW64

[cesarpino]

• I have tried with the latest version of my channel (Stable or Edge)
• I have uploaded diagnostics
• Diagnostics ID: F22B2AE3-B6C5-46A4-B924-8A677C0B85AD/20200516171208

Expected behavior

Without using --entrypoint, I check bash path.

$ winpty docker container run -ti ubuntu
root@d8e47ed3fa6a:/# which bash
/bin/bash
root@d8e47ed3fa6a:/# exit
exit

If I use explicit entry point I should get a bash session

$ winpty docker container run -ti --entrypoint /bin/bash ubuntu
root@d8e47ed3fa6a:/# 

Actual behavior

Gets confused with --entrypoint parameter which seems to be mixed with a local path.

$ winpty docker container run -ti --entrypoint /bin/bash ubuntu
root@d8e47ed3fa6a:/# 
C:/Program Files/Docker/Docker/resources/bin/docker.exe: Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"C:/Program Files/Git/usr/bin/bash.exe\": stat C:/Program Files/Git/usr/bin/bash.exe: no such file or directory": unknown.

Information

• Windows Version: 10 pro
• Docker Desktop Version: 2.3.0.2
• Are you running inside a virtualized Windows e.g. on a cloud server or on a mac VM: no

Steps to reproduce the behavior

1. The issue appears in git-bash console (MINGW64). Install it from https://git-scm.com/download/win
2. Open a git bash console "C:\Program Files\Git\git-bash.exe" --cd-to-home
3. write in the console winpty docker container run -ti --entrypoint /bin/bash ubuntu

[thaJeztah]

This is due to Mingw/msys2 doing automatic path conversion; see http://www.mingw.org/wiki/Posix_path_conversion

You can disable this by prefixing paths with // or setting the MSYS_NO_PATHCONV=1 environment variable (see https://stackoverflow.com/a/34386471)

Because this path conversion happens before docker receives the value, its not something we can fix in docker.

Hope this helps!

[mat007]

Closing as this is due to the shell, not docker.

[docker-robott]

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