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Ï=Ec @ sG d Z d k Z d k Td k Z h Z d d „ Z d „ Z d „ Z d S( s Efficiently compare files, boolean outcome only (equal / not equal).
Tricks (used in this order):
- Use the statcache module to avoid statting files more than once
- Files with identical type, size & mtime are assumed to be clones
- Files with different type or size cannot be identical
- We keep a cache of outcomes of earlier comparisons
- We don't fork a process to run 'cmp' but read the files ourselves
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| <| S( sß Compare two files, use the cache if possible.
May raise os.error if a stat or open of either fails.
Return 1 for identical files, 0 for different.
Raise exceptions if either file could not be statted, read, etc.i i i t N( t sigt statcachet statt f1t f2t s1t s2t S_ISREGt shallowt keyt cachet has_keyt cs1t cs2t outcomet do_cmp( R R R
R R R R R R ( ( t& /usr/lib/python2.4/lib-old/cmpcache.pyt cmp s +$ c C s t | t ƒ | t | t f S( s> Return signature (i.e., type, size, mtime) from raw stat data.N( t S_IFMTt stt ST_MODEt ST_SIZEt ST_MTIME( R ( ( R R 2 s c C sv d d } t | d ƒ } t | d ƒ } xG | i | ƒ } | i | ƒ } | | j o d Sn | p d Sq+ q+ Wd S( s Compare two files, really.i i t rbi i N( t bufsizet openR t fp1R t fp2t readt b1t b2( R R R R R R R ( ( R R 6 s
( t __doc__t osR R R R R R ( R R R R R" R ( ( R t ? s