A package without extras conflicts with the same package with extras

[Atry]

This bug can be reproduced by checking out https://github.com/Atry/mach-nix-bug-report

When I build a Python environment with both gradio and rich in requirements, I encountered the following error:

git checkout https://github.com/Atry/mach-nix-bug-report.git && cd mach-nix-bug-report && nix build .#pythonEnvWithGradioAndRich

trace: 
applying fix 'remove-patches' (patches) for httpx:0.23.3

error: builder for '/nix/store/mmm1vpvzj9dci92lnv83cfr63cq9ligf-python3.9-gradio-3.25.0.drv' failed with exit code 1;
       last 10 log lines:
       > Requirement already satisfied: filelock in /nix/store/2pjx2dgjd7ljk629ivphc6w8z21da2a0-python3.9-filelock-3.11.0/lib/python3.9/site-packages (from huggingface-hub>=0.13.0->gradio==3.25.0) (3.11.0)
       > Requirement already satisfied: mdurl~=0.1 in /nix/store/amr6n1r6dqmlcypk24k92zrjaf8h7yfl-python3.9-mdurl-0.1.2/lib/python3.9/site-packages (from markdown-it-py[linkify]>=2.0.0->gradio==3.25.0) (0.1.2)
       > INFO: pip is looking at multiple versions of huggingface-hub to determine which version is compatible with other requirements. This could take a while.
       > INFO: pip is looking at multiple versions of gradio-client to determine which version is compatible with other requirements. This could take a while.
       > INFO: pip is looking at multiple versions of altair to determine which version is compatible with other requirements. This could take a while.
       > INFO: pip is looking at multiple versions of <Python from Requires-Python> to determine which version is compatible with other requirements. This could take a while.
       > INFO: pip is looking at multiple versions of gradio to determine which version is compatible with other requirements. This could take a while.
       > ERROR: Could not find a version that satisfies the requirement linkify-it-py<3,>=1; extra == "linkify" (from markdown-it-py[linkify]) (from versions: none)
       > ERROR: No matching distribution found for linkify-it-py<3,>=1; extra == "linkify"
       > 
       For full logs, run 'nix log /nix/store/mmm1vpvzj9dci92lnv83cfr63cq9ligf-python3.9-gradio-3.25.0.drv'.
error: 1 dependencies of derivation '/nix/store/jx4cfa7g857pjfry5nya24cf2hg7y8w0-python3-3.9.16-env.drv' failed to build

However, if the requirements only includes one of gradio or rich, nix build would succeed with no error.

nix build .#pythonEnvWithGradio

nix build .#pythonEnvWithRich

Related dependencies

• gradio depends on markdown-it-py[linkify]
• rich depends on markdown-it-py
• markdown-it-py[linkify] depends on linkify-it-py

Workaround

Add providers.markdown-it-py = "sdist"; would suppress the error

nix build .#pythonEnvWithGradioAndRichWorkaround