Micromamba v2.0 unable to parse environment.yml

[breakbotz]

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

Creating issue as recommended in mamba-org/micromamba-releases#58

Latest version of Mamba

• My problem is not solved with the latest version

Tried in Conda?

Not applicable

Describe your issue

A unit test in my GitHub Actions pipeline is failing when attempting to create a micromamba environment using an environment.yaml which has not changed in months.

Using the latest version (curl -Ls https://micro.mamba.pm/api/micromamba/linux-64/latest), we run micromamba env create --yes --file environment.yml which errors with libmamba Could not solve for environment specs. More detailed error logs provided below and full output can be found in my GHA pipeline run.

mamba info / micromamba info

No response

Logs

error    libmamba Could not solve for environment specs
    The following packages are incompatible
    ├─ aiohttp ~= does not exist (perhaps a typo or a missing channel);
    ├─ anthropic ~= does not exist (perhaps a typo or a missing channel);
    ├─ fluxus ~= does not exist (perhaps a typo or a missing channel);
    ├─ gamma-pytools ~= does not exist (perhaps a typo or a missing channel);
    ├─ google-generativeai ~= does not exist (perhaps a typo or a missing channel);
    ├─ graphviz ~= does not exist (perhaps a typo or a missing channel);
    ├─ groq ~= does not exist (perhaps a typo or a missing channel);
    ├─ ipywidgets ~= does not exist (perhaps a typo or a missing channel);
    ├─ jupyterlab ~= does not exist (perhaps a typo or a missing channel);
    ├─ nbsphinx ~= does not exist (perhaps a typo or a missing channel);
    ├─ notebook ~= does not exist (perhaps a typo or a missing channel);
    ├─ openai ~= does not exist (perhaps a typo or a missing channel);
    ├─ packaging ~= does not exist (perhaps a typo or a missing channel);
    ├─ pandas ~= does not exist (perhaps a typo or a missing channel);
    ├─ pre-commit ~= does not exist (perhaps a typo or a missing channel);
    ├─ pytest-asyncio ~= does not exist (perhaps a typo or a missing channel);
    ├─ pytest-cov ~= does not exist (perhaps a typo or a missing channel);
    ├─ pytest ~= does not exist (perhaps a typo or a missing channel);
    ├─ python-dotenv ~= does not exist (perhaps a typo or a missing channel);
    ├─ python-graphviz ~= does not exist (perhaps a typo or a missing channel);
    ├─ pytorch ~= does not exist (perhaps a typo or a missing channel);
    ├─ sphinx-autodoc-typehints ~= does not exist (perhaps a typo or a missing channel);
    ├─ sphinx ~= does not exist (perhaps a typo or a missing channel);
    └─ transformers ~= does not exist (perhaps a typo or a missing channel).
critical libmamba Could not solve for environment specs
Error: Process completed with exit code 1.

environment.yml

name: artkit
channels:
  - bcgx
  - conda-forge
  - defaults
dependencies:
  # Python
  - python                   ~= 3.10.14

  # Additional libraries
  - fluxus                   ~= 1.0
  - gamma-pytools            ~= 3.0
  - pandas                   ~= 2.2
  - python-dotenv            ~= 1.0
  - graphviz                 ~= 9.0
  - python-graphviz          ~= 0.20
  - boto3                    ~= 1.34.0
  - moto                     ~= 5.0.11

  # LLM provider packages:
  - openai                   ~= 1.34
  - groq                     ~= 0.9
  - anthropic                ~= 0.26
  - google-generativeai      ~= 0.6
  - google-cloud-aiplatform  ~= 1.62.0

  # The following are required for huggingface:
  - aiohttp                  ~= 3.9
  - pytorch                  ~= 2.3
  - transformers             ~= 4.41

  # Sphinx documentation build
  - nbsphinx                 ~= 0.9
  - sphinx                   ~= 7.2
  - sphinx-autodoc-typehints ~= 1.25
  - pydata-sphinx-theme      ~= 0.15.1
  - packaging                ~= 24.1

  # Notebooks
  - ipywidgets               ~= 8.1
  - jupyterlab               ~= 4.2
  - notebook                 ~= 7.2

  # DevOps
  - pytest                   ~= 8.2
  - pytest-asyncio           ~= 0.23
  - pytest-cov               ~= 5.0
  - pre-commit               ~= 3.7

~/.condarc

No response

[JohanMabille]

I could reproduce the issue locally (not on CI affected by the GHA bug downloading the wrong micromamba release) with micromamba downloaded from micromamba-releases too.

[glass-ships]

Definitely noticing this and related issues, like hanging on Solving environment: ...working... as well

Mamba 2.0 seems to have broken way more things than it fixed/improved lol

[jjerphan]

This is a regression, micromamba 1.5 works on this example.

[jjerphan]

Bisecting shows that b9706dc from #3089 introduced this issue.