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fix: set UV_PYTHON for before_build on Linux when using uv - #2830
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agriyakhetarpal merged 3 commits intoMay 5, 2026
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agriyakhetarpal
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UV_SYSTEM_PYTHON for before_build on Linux when using uvUV_SYSTEM_PYTHON for before_build on Linux when using uv
henryiii
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May 1, 2026
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I think this makes sense.
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I think this makes sense but I'd rather use UV_PYTHON to be 100% explicit. |
Co-Authored-By: Matthieu Darbois <mayeut@users.noreply.github.com>
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henryiii
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UV_SYSTEM_PYTHON for before_build on Linux when using uvUV_PYTHON for before_build on Linux when using uv
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Fixes #1955. On Linux, we do not create a virtualenv for the build environment, unlike macOS and Windows which call
virtualenv()beforebefore_buildruns. This meansuv pip installinbefore_buildfails witherror: No virtual environment foundwhen using thebuild[uv]as the build frontend, regardless of whether build isolation is disabled.We can set
UV_SYSTEM_PYTHON=1to allow uv to install directly into the container's Python. The build-step environment can be left unchanged, so that isolated builds continue to manage their own internal venvs as usual.I am unsure how to add a test for this, so I haven't added one.