mς %U²Ic@sGdZdkZdkTdkZhZdd„Zd„Zd„ZdS(s­Efficiently 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 N(t*ic Cs tti|ƒƒtti|ƒƒ}}t|dƒ pt|dƒ odSn|o||jodSn|d |d jodSn|d|}t i |ƒo9t |\}}}||jo||jo|Sqηnt||ƒ}|||ft |<|S(sίCompare 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.iiit N(tsigt statcachetstattf1tf2ts1ts2tS_ISREGtshallowtkeytcachethas_keytcs1tcs2toutcometdo_cmp( RRR RRR RRR((t-/data/zmath/lib/python2.4/lib-old/cmpcache.pytcmps +$ cCst|tƒ|t|tfS(s>Return signature (i.e., type, size, mtime) from raw stat data.N(tS_IFMTtsttST_MODEtST_SIZEtST_MTIME(R((RR2scCsvdd}t|dƒ}t|dƒ}xG|i|ƒ}|i|ƒ}||jodSn|pdSq+q+WdS(sCompare two files, really.iitrbiiN( tbufsizetopenRtfp1Rtfp2treadtb1tb2(RRRRR RR((RR6s  (t__doc__tosRRR RRR(RR RRR"R((Rt? s