Source installs fail due to timestamps/zip for flit-based sdists

[adrianeboyd]

(Some?) sdists created with flit (e.g. cloudpathlib, tomli, typer) include a PKG-INFO file with a timestamp of Jan 1 1970, which raises an error when building from source. pip installs without errors.

Command, using uv 0.1.5:

uv pip install cloudpathlib==0.17.0 --no-binary cloudpathlib --no-cache --reinstall

Output:

Resolved 2 packages in 392ms
error: Failed to download distributions
  Caused by: Failed to fetch wheel: cloudpathlib==0.17.0
  Caused by: Failed to build: cloudpathlib==0.17.0
  Caused by: Build backend failed to build wheel through `build_wheel()`:
--- stdout:

--- stderr:
Traceback (most recent call last):
  File "<string>", line 6, in <module>
  File "/tmp/.tmplPwcVh/.tmp6SwAEy/.venv/lib/python3.8/site-packages/flit_core/buildapi.py", line 72, in build_wheel
    info = make_wheel_in(pyproj_toml, Path(wheel_directory))
  File "/tmp/.tmplPwcVh/.tmp6SwAEy/.venv/lib/python3.8/site-packages/flit_core/wheel.py", line 224, in make_wheel_in
    wb.build(editable)
  File "/tmp/.tmplPwcVh/.tmp6SwAEy/.venv/lib/python3.8/site-packages/flit_core/wheel.py", line 210, in build
    self.copy_module()
  File "/tmp/.tmplPwcVh/.tmp6SwAEy/.venv/lib/python3.8/site-packages/flit_core/wheel.py", line 164, in copy_module
    self._add_file(full_path, rel_path)
  File "/tmp/.tmplPwcVh/.tmp6SwAEy/.venv/lib/python3.8/site-packages/flit_core/wheel.py", line 111, in _add_file
    zinfo = zipfile.ZipInfo.from_file(full_path, rel_path)
  File "/usr/lib/python3.8/zipfile.py", line 539, in from_file
    zinfo = cls(arcname, date_time)
  File "/usr/lib/python3.8/zipfile.py", line 362, in __init__
    raise ValueError('ZIP does not support timestamps before 1980')
ValueError: ZIP does not support timestamps before 1980

This looks like the same issue as #579, but it doesn't appear to be fixed by #634?

[konstin]

This got lost in the streaming unpack implementation, i added a test to prevent this from happening again.