Prior to this change, wheel verification would fail on macOS because DYLD_LIBRARY_PATH wasn't been passed down to pytest in ci/scripts/python_util.sh. Here, DYLD_LIBRARY_PATH is used in the tests to specify the location of driver to test so when it's not set, the test fails to find the driver. Presumably this doesn't fail elsewhere because we invoke the tests differently elsewhere.

This ultimately due to System Integrity Protection (SIP) on macOS and that env is /usr/bin/env which is a "restricted" binary. Restricted means environment variables like DYLD_LIBRARY_PATH get stripped from child processes.

This is a simple test that shows how this fails:

$ echo $DYLD_LIBRARY_PATH
XXX

~/tmp/arrow-adbc-tmpdir/venv-wheel-3.10-arm64/bin
$ ./python -c "import os; print(os.environ['DYLD_LIBRARY_PATH'])"
XXX

~/tmp/arrow-adbc-tmpdir/venv-wheel-3.10-arm64/bin
$ env FOO=bar ./python -c "import os; print(os.environ['DYLD_LIBRARY_PATH'])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/bryce/.local/share/uv/python/cpython-3.10.19-macos-aarch64-none/lib/python3.10/os.py", line 680, in __getitem__
    raise KeyError(key) from None
KeyError: 'DYLD_LIBRARY_PATH'