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# lamosity needed to make things reliable on Windows :-(
# (borrowed from Python's test_support.py)
import errno
import os
import shutil
import sys
import time
import warnings
if sys.platform.startswith("win"): # pragma: no cover
def _waitfor(func, pathname, waitall=False):
# Perform the operation
func(pathname)
# Now setup the wait loop
if waitall:
dirname = pathname
else:
dirname, name = os.path.split(pathname)
dirname = dirname or '.'
# Check for `pathname` to be removed from the filesystem.
# The exponential backoff of the timeout amounts to a total
# of ~1 second after which the deletion is probably an error
# anyway.
# Testing on a i7@4.3GHz shows that usually only 1 iteration is
# required when contention occurs.
timeout = 0.001
while timeout < 1.0: # pragma: no branch
# Note we are only testing for the existence of the file(s) in
# the contents of the directory regardless of any security or
# access rights. If we have made it this far, we have sufficient
# permissions to do that much using Python's equivalent of the
# Windows API FindFirstFile.
# Other Windows APIs can fail or give incorrect results when
# dealing with files that are pending deletion.
L = os.listdir(dirname)
if not (L if waitall else name in L): # pragma: no branch
return
# Increase the timeout and try again
time.sleep(timeout) # pragma: no cover
timeout *= 2 # pragma: no cover
warnings.warn('tests may fail, delete still pending for '
+ pathname, # pragma: no cover
RuntimeWarning, stacklevel=4)
def _rmtree(path):
def _rmtree_inner(path):
for name in os.listdir(path):
fullname = os.path.join(path, name)
if os.path.isdir(fullname):
_waitfor(_rmtree_inner, fullname, waitall=True)
os.rmdir(fullname)
else:
os.unlink(fullname)
_waitfor(_rmtree_inner, path, waitall=True)
_waitfor(os.rmdir, path)
else:
_rmtree = shutil.rmtree
def rmtree(path):
try:
_rmtree(path)
except OSError as e: # pragma: no cover
# Unix returns ENOENT, Windows returns ESRCH.
if e.errno not in (errno.ENOENT, errno.ESRCH): # pragma: no branch
raise