Using / as a value for a parameter becomes a path after parse_args() in gitbash

[ewongbb]

• [x ] I was not able to find an open or closed issue matching what I'm seeing

Setup

• Which version of Git for Windows are you using? Is it 32-bit or 64-bit?

$ git --version --build-options

git version 2.41.0.windows.3
cpu: x86_64
built form commit:  4a1821dfb0c2160a4fcc85d2845f095c54339578
sizeof-long: 4
sizeof-size_t: 8
shell-path: /bin/sh
feature: fsmonitor--daemon

• Which version of Windows are you running? Vista, 7, 8, 10? Is it 32-bit or 64-bit?
  Windows 8.1 pro 64 bit (this is also reproducible in Windows 11 using the same version of git-for-windows)

$ cmd.exe /c ver

Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.

• What options did you set as part of the installation? Or did you choose the
  defaults?

# One of the following:
> type "C:\Program Files\Git\etc\install-options.txt"
> type "C:\Program Files (x86)\Git\etc\install-options.txt"
> type "%USERPROFILE%\AppData\Local\Programs\Git\etc\install-options.txt"
> type "$env:USERPROFILE\AppData\Local\Programs\Git\etc\install-options.txt"
$ cat /etc/install-options.txt
Editor Option: VIM
Custom Editor Path:
Default Branch Option:
Path Option: Cmd
SSH Option: OpenSSH
Tortoise Option: false
CURL Option: OpenSSL
CRLF Option: CRLFAlways
Bash Terminal Option: MinTTY
Git Pull Behavior Option: Merge
Use Credential Manager: Disabled
Performance Tweaks FSCache: Enabled
Enable Symlinks: Disabled
Enable Pseudo Console Support: Disabled
Enable FSMonitor: Disabled

• Any other interesting things about your environment that might be related
  to the issue you're seeing?

Details

• Which terminal/shell are you running Git from? e.g Bash/CMD/PowerShell/other

git bash

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

import argparse
import sys

def get_options():
    opts = argparse.ArgumentParser(description="get options")
    opts.add_argument("-d",
                                   help="specify dir",
                                   dest="use_dir",
                                   default=None,
                                   type=str)
    return opts.parse_args()


def main():
    opts = get_options()
    if opts.use_dir is not None:
        print("use_dir : %s" % opts.use_dir)
        print(sys.argv)


if __name__ == "__main__":
    main()

• What did you expect to occur after running these commands?

I expected the following to be printed:

/
['t2.py', '-d', '/']

• What actually happened instead?
  the following was printed instead:

j:/git/
['t2.py', '-d', 'j:/git/']

[dscho]

From our Release Notes' "Known Issues" section:

• If you specify command-line options starting with a slash, POSIX-to-Windows path conversion will kick in converting e.g. "/usr/bin/bash.exe" to "C:\Program Files\Git\usr\bin\bash.exe". When that is not desired -- e.g. "--upload-pack=/opt/git/bin/git-upload-pack" or "-L/regex/" -- you need to set the environment variable MSYS_NO_PATHCONV temporarily, like so:

MSYS_NO_PATHCONV=1 git blame -L/pathconv/ msys2_path_conv.cc

Alternatively, you can double the first slash to avoid POSIX-to-Windows path conversion, e.g. "//usr/bin/bash.exe".

[ewongbb]

My apologies for missing that release note.

[dscho]

My apologies for missing that release note.

TBH it's easy to miss. If you have any idea how to make these hints easier to find, please mention it here.