mς %U²Ic@s7dZdkZhZdd„Zd„Zd„ZdS(sgEfficiently compare files, boolean outcome only (equal / not equal). Tricks (used in this order): - 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 Nic Cstti|ƒƒtti|ƒƒ}}|ddjp|ddjodSn|o||jodSn|d |d jodSn||f}y9t |\}}}||jo||jo|SnWnt j onXt||ƒ}|||ft |<|S(s₯Compare two files, use the cache if possible. Return 1 for identical files, 0 for different. Raise exceptions if either file could not be statted, read, etc.iiiiN(tsigtoststattf1tf2ts1ts2tshallowtkeytcachetcs1tcs2toutcometKeyErrortdo_cmp( RRRRRRR R R ((t(/data/zmath/lib/python2.4/lib-old/cmp.pytcmps$+"  cCs/|dd}|d}|d}|||fS(s§Return signature (i.e., type, size, mtime) from raw stat data 0-5: st_mode, st_ino, st_dev, st_nlink, st_uid, st_gid 6-9: st_size, st_atime, st_mtime, st_ctimeiiiiN(tstttypetsizetmtime(RRRR((RR-s   cCsvdd}t|dƒ}t|dƒ}xG|i|ƒ}|i|ƒ}||jodSn|pdSq+q+WdS(sCompare two files, really.iitrbiiN( tbufsizetopenRtfp1Rtfp2treadtb1tb2(RRRRRRR((RR6s  (t__doc__RR RRR(RR RRR((Rt?s