build backend: find_uv_bin fails with pip #9991
Description
pip has an issue installing a project using the uv backend, both when installing in editable mode and not. My system uses the following:
- uv 0.5.10 (37b11dd 2024-12-17).
- Python 3.12.7
- pip 24.3.1
This can be reproduced with the following:
$ uv --preview init xyz --build-backend uv
Initialized project `xyz` at `/Users/cthoyt/Desktop/xyz`
$ cd xyzHere's the error from regular install. Note that UV_PREVIEW=1 is required here, otherwise the uv package doesn't have the right functions exposed, and unlike when using uv directly, we can't pass --preview.
$ UV_PREVIEW=1 python3 -m pip install .
Processing /Users/cthoyt/Desktop/xyz
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing metadata (pyproject.toml) ... error
error: subprocess-exited-with-error
× Preparing metadata (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [18 lines of output]
Traceback (most recent call last):
File "/Users/cthoyt/.virtualenvs/biopragmatics/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
main()
File "/Users/cthoyt/.virtualenvs/biopragmatics/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
json_out['return_val'] = hook(**hook_input['kwargs'])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/cthoyt/.virtualenvs/biopragmatics/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 149, in prepare_metadata_for_build_wheel
return hook(metadata_directory, config_settings)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/var/folders/6k/r2gmmc213vl6h7bv20x624xw0000gn/T/pip-build-env-8hdutcpq/overlay/lib/python3.12/site-packages/uv/_build_backend.py", line 84, in prepare_metadata_for_build_wheel
return call(args, config_settings)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/var/folders/6k/r2gmmc213vl6h7bv20x624xw0000gn/T/pip-build-env-8hdutcpq/overlay/lib/python3.12/site-packages/uv/_build_backend.py", line 36, in call
result = subprocess.run([find_uv_bin()] + args, stdout=subprocess.PIPE)
^^^^^^^^^^^^^
File "/private/var/folders/6k/r2gmmc213vl6h7bv20x624xw0000gn/T/pip-build-env-8hdutcpq/overlay/lib/python3.12/site-packages/uv/_find_uv.py", line 36, in find_uv_bin
raise FileNotFoundError(path)
FileNotFoundError: /Users/cthoyt/Library/Python/3.12/bin/uv
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed
× Encountered error while generating package metadata.
╰─> See above for output.
note: This is an issue with the package mentioned above, not pip.
hint: See above for details.Here's the error from editable install
$ UV_PREVIEW=1 python3 -m pip install -e .
Obtaining file:///Users/cthoyt/Desktop/xyz
Installing build dependencies ... done
Checking if build backend supports build_editable ... done
Getting requirements to build editable ... done
Preparing editable metadata (pyproject.toml) ... error
error: subprocess-exited-with-error
× Preparing editable metadata (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [18 lines of output]
Traceback (most recent call last):
File "/Users/cthoyt/.virtualenvs/biopragmatics/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
main()
File "/Users/cthoyt/.virtualenvs/biopragmatics/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
json_out['return_val'] = hook(**hook_input['kwargs'])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/cthoyt/.virtualenvs/biopragmatics/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 181, in prepare_metadata_for_build_editable
return hook(metadata_directory, config_settings)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/var/folders/6k/r2gmmc213vl6h7bv20x624xw0000gn/T/pip-build-env-3lz54y_v/overlay/lib/python3.12/site-packages/uv/_build_backend.py", line 110, in prepare_metadata_for_build_editable
return call(args, config_settings)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/var/folders/6k/r2gmmc213vl6h7bv20x624xw0000gn/T/pip-build-env-3lz54y_v/overlay/lib/python3.12/site-packages/uv/_build_backend.py", line 36, in call
result = subprocess.run([find_uv_bin()] + args, stdout=subprocess.PIPE)
^^^^^^^^^^^^^
File "/private/var/folders/6k/r2gmmc213vl6h7bv20x624xw0000gn/T/pip-build-env-3lz54y_v/overlay/lib/python3.12/site-packages/uv/_find_uv.py", line 36, in find_uv_bin
raise FileNotFoundError(path)
FileNotFoundError: /Users/cthoyt/Library/Python/3.12/bin/uv
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed
× Encountered error while generating package metadata.
╰─> See above for output.
note: This is an issue with the package mentioned above, not pip.
hint: See above for details.