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comparison mercurial/util.py @ 8297:7f27e69dd27f

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util: stop overwriting sha1, overwrite _fastsha1 instead Some modules (like revlog) would import util.sha1 as _sha1. This defeats the purpose of having util.sha1 overwrite itself with a faster version -- revlog would end up always calling the slow version. By always delegating to util._fastsha1 we avoid this at the cost of an extra (but unconditional) indirection.
author Martin Geisler <mg@lazybytes.net>
date Mon, 04 May 2009 22:14:52 +0200
parents 908c5906091b
children edd676eae7d7
comparison
equal deleted inserted replaced
8296:908c5906091b 8297:7f27e69dd27f
19 import imp 19 import imp
20 20
21 # Python compatibility 21 # Python compatibility
22 22
23 def sha1(s): 23 def sha1(s):
24 try: 24 return _fastsha1(s)
25 import hashlib 25
26 _sha1 = hashlib.sha1 26 def _fastsha1(s):
27 # This function will import sha1 from hashlib or sha (whichever is
28 # available) and overwrite itself with it on the first call.
29 # Subsequent calls will go directly to the imported function.
30 try:
31 from hashlib import sha1 as _sha1
27 except ImportError: 32 except ImportError:
28 from sha import sha as _sha1 33 from sha import sha as _sha1
29 global sha1 34 global _fastsha1
30 sha1 = _sha1 35 _fastsha1 = _sha1
31 return _sha1(s) 36 return _sha1(s)
32 37
33 import subprocess 38 import subprocess
34 closefds = os.name == 'posix' 39 closefds = os.name == 'posix'
35 def popen2(cmd, mode='t', bufsize=-1): 40 def popen2(cmd, mode='t', bufsize=-1):