Re-running a build command results in max() arg is an empty sequence at end

[Strilanc]

Run this command (or a similar one) twice:

CIBW_BUILD=cp39-musllinux_i686 cibuildwheel --platform linux

The second run will end with a failure like this one:

Traceback (most recent call last):
  File ".../bin/cibuildwheel", line 8, in <module>
    sys.exit(main())
  File ".../python3.9/site-packages/cibuildwheel/__main__.py", line 213, in main
    assert_never(platform)
  File "/usr/lib/python3.9/contextlib.py", line 126, in __exit__
    next(self.gen)
  File ".../python3.9/site-packages/cibuildwheel/util.py", line 433, in print_new_wheels
    max_name_len = max(len(f.name) for f in new_contents)
ValueError: max() arg is an empty sequence

This should work on basically any project / build identifier.

[henryiii]

I believe that’s because the build plan is empty and it’s being fixed in #1086.

[henryiii]

Though I don’t know why it happens on the second run, we haven’t thought about multiple runs that much, as the original target was CI.

[joerick]

Fixed by #1086. I think that the second run failed because the wheel was already present (as checked in print_new_wheels by name and filesize). Perhaps that check should also include modification date.