run-tests: avoid set PYTHONUSERBASE environment variable to None
According to python documentation, get_config_var can return None and it was
during running mercurial tests under a virtual environment with the local built
mercurial installed as a python package with `pip install -e .`.
On the other hand, if mercurial is installed in the user library folders with
`pip install --local -e .` the issue doesn't reproduce.
The fallback is that it will just set an empty string and everything should work
as before, according to https://www.python.org/dev/peps/pep-0370/:
The path to the user base directory can be overwritten with the environment
variable PYTHONUSERBASE. The default location is used when PYTHONUSERBASE is
not set or empty.
from __future__ import (
absolute_import,
print_function,
)
import argparse
import os
ap = argparse.ArgumentParser()
ap.add_argument('path', nargs='+')
opts = ap.parse_args()
def gather():
for p in opts.path:
if not os.path.exists(p):
return
if os.path.isdir(p):
yield p + os.path.sep
for dirpath, dirs, files in os.walk(p):
for d in dirs:
yield os.path.join(dirpath, d) + os.path.sep
for f in files:
yield os.path.join(dirpath, f)
else:
yield p
print('\n'.join(sorted(gather())))