Specifying channel::pkg_name errors under certain conditions

[travishathaway]

Checklist

• I added a descriptive title
• I searched open reports and couldn't find a duplicate

What happened?

When I run the following command:

conda create -n blerp -c conda-forge pytorch::pytorch ultralytics torchvision pytorch-cuda=11.8 --solver=libmamba

I get the following error:

# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<

    Traceback (most recent call last):
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda_libmamba_solver/solver.py", line 575, in _str_to_matchspec
        name, version, build = spec.rsplit("-", 2)
        ^^^^^^^^^^^^^^^^^^^^
    ValueError: not enough values to unpack (expected 3, got 1)

    The above exception was the direct cause of the following exception:

    Traceback (most recent call last):
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/exception_handler.py", line 17, in __call__
        return func(*args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/cli/main.py", line 64, in main_subshell
        exit_code = do_call(args, parser)
                    ^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/cli/conda_argparse.py", line 167, in do_call
        result = getattr(module, func_name)(args, parser)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/notices/core.py", line 124, in wrapper
        return func(*args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/cli/main_create.py", line 50, in execute
        install(args, parser, "create")
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/cli/install.py", line 316, in install
        unlink_link_transaction = solver.solve_for_transaction(
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/core/solve.py", line 154, in solve_for_transaction
        unlink_precs, link_precs = self.solve_for_diff(
                                   ^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda/core/solve.py", line 215, in solve_for_diff
        final_precs = self.solve_final_state(
                      ^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda_libmamba_solver/solver.py", line 215, in solve_final_state
        out_state = self._solving_loop(in_state, out_state, index)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda_libmamba_solver/solver.py", line 302, in _solving_loop
        solved = self._solve_attempt(in_state, out_state, index)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda_libmamba_solver/solver.py", line 378, in _solve_attempt
        new_conflicts = self._maybe_raise_for_problems(problems, old_conflicts)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda_libmamba_solver/solver.py", line 635, in _maybe_raise_for_problems
        problems = self._parse_problems(problems)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda_libmamba_solver/solver.py", line 615, in _parse_problems
        conflicts.append(cls._str_to_matchspec(words[-1]))
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/user-account/opt/conda_x86_64/lib/python3.11/site-packages/conda_libmamba_solver/solver.py", line 585, in _str_to_matchspec
        raise ValueError(f"Could not parse spec: {spec}") from exc
    ValueError: Could not parse spec: pytorch::pytorch

`$ /Users/user-account/opt/conda_x86_64/bin/conda create -n blerp -c conda-forge pytorch::pytorch ultralytics torchvision pytorch-cuda=11.8 --solver=libmamba`

  environment variables:
                 CIO_TEST=<not set>
        CONDA_DEFAULT_ENV=base
                CONDA_EXE=/Users/user-account/opt/conda_x86_64/bin/conda
             CONDA_PREFIX=/Users/user-account/opt/conda_x86_64
    CONDA_PROMPT_MODIFIER=false
         CONDA_PYTHON_EXE=/Users/user-account/opt/conda_x86_64/bin/python
               CONDA_ROOT=/Users/user-account/opt/conda_x86_64
              CONDA_SHLVL=1
           CURL_CA_BUNDLE=<not set>
               LD_PRELOAD=<not set>
                     PATH=/Users/user-account/opt/conda_x86_64/bin:/Users/user-account/opt/c
                          onda_x86_64/condabin:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin:/u
                          sr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/Library
                          /TeX/texbin:/Users/user-account/.cargo/bin:/Users/user-account/Lib
                          rary/Application Support/JetBrains/Toolbox/scripts:/Users/user-account
                          /bin:/Users/user-account/.local/bin:/opt/homebrew/opt/fzf/bin
         PYTHONNOUSERSITE=1
       REQUESTS_CA_BUNDLE=<not set>
            SSL_CERT_FILE=<not set>

     active environment : base
    active env location : /Users/user-account/opt/conda_x86_64
            shell level : 1
       user config file : /Users/user-account/.condarc
 populated config files : /Users/user-account/.condarc
          conda version : 23.7.2
    conda-build version : not installed
         python version : 3.11.4.final.0
       virtual packages : __archspec=1=x86_64
                          __osx=12.2.1=0
                          __unix=0=0
       base environment : /Users/user-account/opt/conda_x86_64  (writable)
      conda av data dir : /Users/user-account/opt/conda_x86_64/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/osx-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/osx-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/osx-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /Users/user-account/opt/conda_x86_64/pkgs
                          /Users/user-account/.conda/pkgs
       envs directories : /Users/user-account/opt/conda_x86_64/envs
                          /Users/user-account/.conda/envs
               platform : osx-64
             user-agent : conda/23.7.2 requests/2.31.0 CPython/3.11.4 Darwin/21.3.0 OSX/12.2.1 solver/libmamba conda-libmamba-solver/23.7.0 libmambapy/1.4.8
                UID:GID : 501:20
             netrc file : None
           offline mode : False


An unexpected error has occurred. Conda has prepared the above report.
If you suspect this error is being caused by a malfunctioning plugin,
consider using the --no-plugins option to turn off plugins.

Example: conda --no-plugins install <package>

Alternatively, you can set the CONDA_NO_PLUGINS environment variable on
the command line to run the command without plugins enabled.

Example: CONDA_NO_PLUGINS=true conda install <package>

But, when I run:

conda create -n blerp pytorch::pytorch  --solver=libmamba

Everything works fine. Not sure what's causing the error here 🤷.

Conda Info

See the error report above.

Conda Config

channels:
  - defaults

Conda list

n/a

Additional Context

No response

[jaimergp]

This is an unfortunate consequence of the newline issue reported for libmamba 1.4.5, fixed in 1.5.0. The parsing code gets a red herring (because all error lines are merged in a single one), and it tries to parse things in the wrong way. Will be fixed by #242 (or a successor).

[jaimergp]

This is the error message you should see if you update to libmamba 1.5.0:

Could not solve for environment specs
The following packages are incompatible
├─ pytorch does not exist (perhaps a typo or a missing channel);
└─ pytorch-cuda 11.8**  is not installable because it requires
   └─ cuda 11.8.* , which does not exist (perhaps a missing channel).

[jaimergp]

Closed by #270