micromamba in Windows 11: when root is in a mapped drive, activate/deactivate command gives error "The specified path is invalid" due to openssl_activate-win.bat or openssl_deactivate-win.bat

[gitfish77]

Troubleshooting docs

• My problem is not solved in the Troubleshooting docs

Anaconda default channels

• I do NOT use the Anaconda default channels (pkgs/* etc.)

How did you install Mamba?

Micromamba

Search tried in issue tracker

searched "specified path" or "openssl_activate" and got no match

Latest version of Mamba

• My problem is not solved with the latest version

Tried in Conda?

I didn't try

Describe your issue

The folllowing are repro steps with cmd.exe shell. The similar issue also happened with PowerShell shell.
Also "micromamba run" met similar error in a mapped drive.

// [actually inside a Win11 VM] open a cmd.exe Command Prompt window:

C:\Users\devf>net use x:
Local name        x:
Remote name       \\vmware-host\Shared Folders
Resource type     Disk
The command completed successfully.

C:\Users\devf>micromamba shell init --shell cmd.exe --root-prefix=x:\project\tmp\mamba_root
Setting cmd.exe AUTORUN to: "\\vmware-host\Shared Folders\project\tmp\mamba_root\condabin\mamba_hook.bat"
Windows long-path support already enabled. (Windows version = 10.0.22000)

// close the cmd.exe Command Prompt window and open a new one:

C:\Users\devf>micromamba env list
  Name  Active  Path
----------------------------------------------------------------------------------------------
  base  *       \\vmware-host\Shared Folders\project\tmp\mamba_root

C:\Users\devf>micromamba create -n env_py310test python==3.10.1
{... Transaction finished ...}

C:\Users\devf>micromamba env list
  Name           Active  Path
-------------------------------------------------------------------------------------------------------
  base           *       \\vmware-host\Shared Folders\project\tmp\mamba_root
  env_py310test          \\vmware-host\Shared Folders\project\tmp\mamba_root\envs\env_py310test

C:\Users\devf>micromamba activate env_py310test
The specified path is invalid.

(env_py310test) C:\Users\devf>python -c "import sys; print(sys.version)"
3.10.1 | packaged by conda-forge | (main, Dec 22 2021, 01:34:40) [MSC v.1929 64 bit (AMD64)]

(env_py310test) C:\Users\devf>micromamba deactivate
The specified path is invalid.

I investigated the issue, and the cause should be from the following script:
X:\project\tmp\mamba_root\condabin>notepad _micromamba_activate.bat
// in executing the above script
// step a] @"%MAMBA_EXE%" shell %* --shell cmd.exe 1>%UNIQUE%
// this step generates a temp script, e.g. _TEMP_SCRIPT_PATH="C:\Users\devf\AppData\Local\Temp\mamba_act44uefpcq7c.bat"
// step b] @CALL "%_TEMP_SCRIPT_PATH%"
// this step calls the above temp script, and failed at the first and/or last line in the temp script like:
@CALL "\\\\vmware-host\\Shared Folders\\project\\tmp\\mamba_ps\\envs\\env_py310test\\etc\\conda\\activate.d\\openssl_activate-win.bat"
The specified path is invalid.
// Actually the following command also failed:
type "\\\\vmware-host\\Shared Folders\\project\\tmp\\mamba_ps\\envs\\env_py310test\\etc\\conda\\activate.d\\openssl_activate-win.bat"
The specified path is invalid.
// the temp script file exists, but the temp script wrongly uses "\\" instead of the desired "\".

// Interestingly, when the micromamba root points to a local drive, the line looks like:
@CALL "C:\\tmp\\mamba\\micromamba\\envs\\env_py310test\\etc\\conda\\activate.d\\openssl_activate-win.bat"
type "C:\\tmp\\mamba\\micromamba\\envs\\env_py310test\\etc\\conda\\activate.d\\openssl_activate-win.bat"
// the above script path also has redudant "\\" instead of desired "\", yet Win11 somehow allows accessing the file.

The fix should be:
Generate the temp script in the above step a] with micromamba.exe, to have "\" instead of "\\" when invoking openssl_activate-win.bat or openssl_deactivate-win.bat. There can be one or two @call to the openssl_*.bat script in the temp script.

Actually there are more error cases related to the "\\" vs "\"
$ micromamba run -n env_py310test python -c "import sys; print(sys.version)"
...
trace    libmamba Compute configurable 'use_target_prefix_fallback'
trace    libmamba Compute configurable 'target_prefix'
critical libmamba weakly_canonical: The specified path is invalid.: "\\\\vmware-host\\Shared Folders\\project\\tmp\\mamba_ps\\envs\\env_py310test\\"
info     libmamba ****************** Backtrace End ********************

I tried with PowerShell root in a mapped drive, and the similar error happens. I don't know the exact cause though.

mamba info / micromamba info

(env_py310test) C:\Users\devf>micromamba info

       libmamba version : 2.0.5
     micromamba version : 2.0.5
           curl version : libcurl/8.8.0-DEV Schannel zlib/1.3.1
     libarchive version : libarchive 3.7.2 zlib/1.3.1 liblzma/5.6.2 bz2lib/1.0.8 liblz4/1.9.4 libzstd/1.5.6
       envs directories : \\vmware-host\Shared Folders\project\tmp\mamba_root\envs
          package cache : \\vmware-host\Shared Folders\project\tmp\mamba_root\pkgs
                          C:\Users\devf\.mamba\pkgs
                          C:\Users\devf\AppData\Roaming\.mamba\pkgs
            environment : env_py310test (active)
           env location : \\vmware-host\Shared Folders\project\tmp\mamba_root\envs\env_py310test
      user config files : C:\Users\devf\.mambarc
 populated config files :
       virtual packages : __win=10.0.22000=0
                          __archspec=1=x86_64
               channels : https://conda.anaconda.org/conda-forge/noarch
                          https://conda.anaconda.org/conda-forge/win-64
       base environment : \\vmware-host\Shared Folders\project\tmp\mamba_root
               platform : win-64

Logs

environment.yml

~/.condarc