fcntl.flock(lf.fileno(), fcntl.LOCK_UN)
lf.close
+def md5_file(filename):
+ """
+ Return the hex string representation of the MD5 checksum of filename.
+ """
+ try:
+ import hashlib
+ m = hashlib.md5()
+ except ImportError:
+ import md5
+ m = md5.new()
+
+ for line in open(filename):
+ m.update(line)
+ return m.hexdigest()
+
+def sha256_file(filename):
+ """
+ Return the hex string representation of the 256-bit SHA checksum of
+ filename. On Python 2.4 this will return None, so callers will need to
+ handle that by either skipping SHA checks, or running a standalone sha256sum
+ binary.
+ """
+ try:
+ import hashlib
+ except ImportError:
+ return None
+
+ s = hashlib.sha256()
+ for line in open(filename):
+ s.update(line)
+ return s.hexdigest()
