Can't specify URIs (for multiple paths) in UV_CONSTRAINT

[henryiii]

In pip, if you want to provide a path that has as space in it, you must provide a URI, as pip universally uses spaces for separating arguments. So for example, to set two constraint files that potentially contain spaces, you'd do:

echo "packaging==21.2" > 'file 1.txt'
echo "cowsay==6.0" > 'file 2.txt'
a = $(python3 -c 'import pathlib; print(pathlib.Path("file 1.txt").resolve().as_uri())')
b = $(python3 -c 'import pathlib; print(pathlib.Path("file 2.txt").resolve().as_uri())')
uv venv
PIP_CONSTRAINT="$a $b" pip install --python .venv cowsay packaging

(This is exactly what cibuildwheel does, it has it's own constraint file which it is combining with a user specified file(s), and it doesn't know if there might be spaces in the paths)

Trying this with uv just breaks on the URI with error: File not found: `file:///.../cibuildwheel/tmp/file%202.txt` . If I remove the spaces, it handles the space separated files just fine, but it doesn't seem to support URIs, which is the standard way to allow space separated paths in Pip.

[charliermarsh]

Sounds like a bug, thanks.

[charliermarsh]

Does PIP_CONSTRAINT="$a" pip install --python .venv cowsay packaging work? (Is the "multiple files" relevant?)

[henryiii]

Multiple files is not relevant actually, other than being the reason that spaces aren't available for file paths. Pip generally accepts a URI anywhere it accepts a file path, which happens to be important for environment variables that use the space for other purposes.

Yes, pip works with one file.