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import os
import stat
import tempfile
_DEF_PERMS = 0o644
def write_file(filename, content, mode=None, omode="wb", copy_mode=False):
"""Atomically write filename.
open filename in mode 'omode', write content, chmod to 'mode'.
"""
if mode is None:
mode = _DEF_PERMS
if copy_mode:
try:
file_stat = os.stat(filename)
mode = stat.S_IMODE(file_stat.st_mode)
except OSError:
pass
tf = None
try:
tf = tempfile.NamedTemporaryFile(dir=os.path.dirname(filename),
delete=False, mode=omode)
tf.write(content)
tf.close()
os.chmod(tf.name, mode)
os.rename(tf.name, filename)
except OSError as e:
if tf is not None:
os.unlink(tf.name)
raise e