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[utils] locked_file: Do not truncate files before locking (#2994)

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Authored by: jakeogh, pukkandan
This commit is contained in:
Justin Keogh
2022-04-07 05:58:56 +00:00
committed by GitHub
parent 06b1628d3e
commit fcfa8853e4
1 changed files with 19 additions and 4 deletions
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23
yt_dlp/utils.py
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@@ -2222,10 +2222,23 @@ class locked_file(object):
locked = False
def __init__(self, filename, mode, block=True, encoding=None):
assert mode in {'r', 'rb', 'a', 'ab', 'w', 'wb'}
self.f = open(filename, mode, encoding=encoding)
self.mode = mode
self.block = block
if mode not in {'r', 'rb', 'a', 'ab', 'w', 'wb'}:
raise NotImplementedError(mode)
self.mode, self.block = mode, block
writable = any(f in mode for f in 'wax+')
readable = any(f in mode for f in 'r+')
flags = functools.reduce(operator.ior, (
getattr(os, 'O_CLOEXEC', 0), # UNIX only
getattr(os, 'O_BINARY', 0), # Windows only
getattr(os, 'O_NOINHERIT', 0), # Windows only
os.O_CREAT if writable else 0, # O_TRUNC only after locking
os.O_APPEND if 'a' in mode else 0,
os.O_EXCL if 'x' in mode else 0,
os.O_RDONLY if not writable else os.O_RDWR if readable else os.O_WRONLY,
))
self.f = os.fdopen(os.open(filename, flags), mode, encoding=encoding)
def __enter__(self):
exclusive = 'r' not in self.mode
@@ -2235,6 +2248,8 @@ class locked_file(object):
except IOError:
self.f.close()
raise
if 'w' in self.mode:
self.f.truncate()
return self
def unlock(self):