uv pip install --target seems to fail when there is no wheel available on pypi.org

[gotcha]

Thanks a lot for adding the --target option to uv pip install.

I am using 0.1.39

$ uv venv
$ uv pip install --target bla --no-deps install zope.component
Resolved 1 package in 393ms
Downloaded 1 package in 61ms
Installed 1 package in 2ms
 + zope-component==6.0
$ ls bla
zope  zope.component-6.0-py3.9-nspkg.pth  zope.component-6.0.dist-info
$ #success :-)

$ uv pip install --target bla --no-deps install zope.component==4.1.0
error: Failed to download and build `zope-component==4.1.0`
  Caused by: Failed to build: `zope-component==4.1.0`
  Caused by: Build backend failed to determine extra requires with `build_wheel()` with exit status: 1
--- stdout:

--- stderr:
Traceback (most recent call last):
  File "<string>", line 8, in <module>
ModuleNotFoundError: No module named 'setuptools'
---
$ ls bla
_distutils_hack  distutils-precedence.pth  pkg_resources  setuptools  setuptools-69.5.1.dist-info

My shallow knowledge makes me think that the process to produce a wheel locally is failing.

$ uv pip install --target bla install zope.component==4.1.0
error: Failed to download and build `zope-component==4.1.0`
  Caused by: Failed to build: `zope-component==4.1.0`
  Caused by: Build backend failed to determine extra requires with `build_wheel()` with exit status: 1
--- stdout:

--- stderr:
Traceback (most recent call last):
  File "<string>", line 8, in <module>
ModuleNotFoundError: No module named 'setuptools'
---
$ ls bla
_distutils_hack  distutils-precedence.pth  pkg_resources  setuptools  setuptools-69.5.1.dist-info

The problem is the same with or without the --no-deps flag.

Same issue when installing zest.releaser which does not have any released wheel.
Even though installing ipdb works fine : there is a wheel on pypi.org.

[charliermarsh]

Thanks, I think this is a real bug in --target.