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332 lines
10 KiB
332 lines
10 KiB
4 years ago
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"""Utilities for comparing files and directories.
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Classes:
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dircmp
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Functions:
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cmp(f1, f2, shallow=1, use_statcache=0) -> int
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cmpfiles(a, b, common) -> ([], [], [])
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"""
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import os
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import stat
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import statcache
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__all__ = ["cmp","dircmp","cmpfiles"]
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_cache = {}
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BUFSIZE=8*1024
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def cmp(f1, f2, shallow=1, use_statcache=0):
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"""Compare two files.
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Arguments:
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f1 -- First file name
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f2 -- Second file name
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shallow -- Just check stat signature (do not read the files).
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defaults to 1.
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use_statcache -- Do not stat() each file directly: go through
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the statcache module for more efficiency.
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Return value:
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integer -- 1 if the files are the same, 0 otherwise.
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This function uses a cache for past comparisons and the results,
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with a cache invalidation mechanism relying on stale signatures.
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Of course, if 'use_statcache' is true, this mechanism is defeated,
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and the cache will never grow stale.
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"""
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if use_statcache:
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stat_function = statcache.stat
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else:
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stat_function = os.stat
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s1 = _sig(stat_function(f1))
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s2 = _sig(stat_function(f2))
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if s1[0] != stat.S_IFREG or s2[0] != stat.S_IFREG:
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return 0
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if shallow and s1 == s2:
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return 1
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if s1[1] != s2[1]:
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return 0
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result = _cache.get((f1, f2))
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if result and (s1, s2) == result[:2]:
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return result[2]
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outcome = _do_cmp(f1, f2)
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_cache[f1, f2] = s1, s2, outcome
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return outcome
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def _sig(st):
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return (stat.S_IFMT(st[stat.ST_MODE]),
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st[stat.ST_SIZE],
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st[stat.ST_MTIME])
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def _do_cmp(f1, f2):
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bufsize = BUFSIZE
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fp1 = open(f1, 'rb')
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fp2 = open(f2, 'rb')
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while 1:
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b1 = fp1.read(bufsize)
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b2 = fp2.read(bufsize)
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if b1 != b2:
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return 0
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if not b1:
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return 1
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# Directory comparison class.
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#
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class dircmp:
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"""A class that manages the comparison of 2 directories.
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dircmp(a,b,ignore=None,hide=None)
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A and B are directories.
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IGNORE is a list of names to ignore,
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defaults to ['RCS', 'CVS', 'tags'].
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HIDE is a list of names to hide,
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defaults to [os.curdir, os.pardir].
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High level usage:
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x = dircmp(dir1, dir2)
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x.report() -> prints a report on the differences between dir1 and dir2
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or
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x.report_partial_closure() -> prints report on differences between dir1
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and dir2, and reports on common immediate subdirectories.
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x.report_full_closure() -> like report_partial_closure,
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but fully recursive.
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Attributes:
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left_list, right_list: The files in dir1 and dir2,
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filtered by hide and ignore.
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common: a list of names in both dir1 and dir2.
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left_only, right_only: names only in dir1, dir2.
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common_dirs: subdirectories in both dir1 and dir2.
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common_files: files in both dir1 and dir2.
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common_funny: names in both dir1 and dir2 where the type differs between
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dir1 and dir2, or the name is not stat-able.
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same_files: list of identical files.
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diff_files: list of filenames which differ.
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funny_files: list of files which could not be compared.
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subdirs: a dictionary of dircmp objects, keyed by names in common_dirs.
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"""
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def __init__(self, a, b, ignore=None, hide=None): # Initialize
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self.left = a
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self.right = b
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if hide is None:
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self.hide = [os.curdir, os.pardir] # Names never to be shown
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else:
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self.hide = hide
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if ignore is None:
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self.ignore = ['RCS', 'CVS', 'tags'] # Names ignored in comparison
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else:
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self.ignore = ignore
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def phase0(self): # Compare everything except common subdirectories
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self.left_list = _filter(os.listdir(self.left),
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self.hide+self.ignore)
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self.right_list = _filter(os.listdir(self.right),
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self.hide+self.ignore)
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self.left_list.sort()
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self.right_list.sort()
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__p4_attrs = ('subdirs',)
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__p3_attrs = ('same_files', 'diff_files', 'funny_files')
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__p2_attrs = ('common_dirs', 'common_files', 'common_funny')
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__p1_attrs = ('common', 'left_only', 'right_only')
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__p0_attrs = ('left_list', 'right_list')
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def __getattr__(self, attr):
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if attr in self.__p4_attrs:
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self.phase4()
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elif attr in self.__p3_attrs:
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self.phase3()
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elif attr in self.__p2_attrs:
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self.phase2()
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elif attr in self.__p1_attrs:
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self.phase1()
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elif attr in self.__p0_attrs:
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self.phase0()
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else:
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raise AttributeError, attr
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return getattr(self, attr)
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def phase1(self): # Compute common names
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a_only, b_only = [], []
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common = {}
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b = {}
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for fnm in self.right_list:
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b[fnm] = 1
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for x in self.left_list:
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if b.get(x, 0):
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common[x] = 1
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else:
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a_only.append(x)
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for x in self.right_list:
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if common.get(x, 0):
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pass
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else:
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b_only.append(x)
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self.common = common.keys()
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self.left_only = a_only
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self.right_only = b_only
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def phase2(self): # Distinguish files, directories, funnies
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self.common_dirs = []
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self.common_files = []
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self.common_funny = []
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for x in self.common:
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a_path = os.path.join(self.left, x)
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b_path = os.path.join(self.right, x)
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ok = 1
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try:
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a_stat = statcache.stat(a_path)
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except os.error, why:
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# print 'Can\'t stat', a_path, ':', why[1]
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ok = 0
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try:
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b_stat = statcache.stat(b_path)
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except os.error, why:
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# print 'Can\'t stat', b_path, ':', why[1]
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ok = 0
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if ok:
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a_type = stat.S_IFMT(a_stat[stat.ST_MODE])
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b_type = stat.S_IFMT(b_stat[stat.ST_MODE])
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if a_type != b_type:
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self.common_funny.append(x)
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elif stat.S_ISDIR(a_type):
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self.common_dirs.append(x)
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elif stat.S_ISREG(a_type):
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self.common_files.append(x)
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else:
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self.common_funny.append(x)
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else:
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self.common_funny.append(x)
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def phase3(self): # Find out differences between common files
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xx = cmpfiles(self.left, self.right, self.common_files)
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self.same_files, self.diff_files, self.funny_files = xx
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def phase4(self): # Find out differences between common subdirectories
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# A new dircmp object is created for each common subdirectory,
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# these are stored in a dictionary indexed by filename.
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# The hide and ignore properties are inherited from the parent
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self.subdirs = {}
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for x in self.common_dirs:
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a_x = os.path.join(self.left, x)
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b_x = os.path.join(self.right, x)
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self.subdirs[x] = dircmp(a_x, b_x, self.ignore, self.hide)
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def phase4_closure(self): # Recursively call phase4() on subdirectories
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self.phase4()
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for x in self.subdirs.keys():
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self.subdirs[x].phase4_closure()
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def report(self): # Print a report on the differences between a and b
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# Output format is purposely lousy
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print 'diff', self.left, self.right
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if self.left_only:
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self.left_only.sort()
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print 'Only in', self.left, ':', self.left_only
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if self.right_only:
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self.right_only.sort()
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print 'Only in', self.right, ':', self.right_only
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if self.same_files:
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self.same_files.sort()
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print 'Identical files :', self.same_files
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if self.diff_files:
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self.diff_files.sort()
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print 'Differing files :', self.diff_files
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if self.funny_files:
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self.funny_files.sort()
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print 'Trouble with common files :', self.funny_files
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if self.common_dirs:
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self.common_dirs.sort()
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print 'Common subdirectories :', self.common_dirs
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if self.common_funny:
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self.common_funny.sort()
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print 'Common funny cases :', self.common_funny
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def report_partial_closure(self): # Print reports on self and on subdirs
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self.report()
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for x in self.subdirs.keys():
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print
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self.subdirs[x].report()
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def report_full_closure(self): # Report on self and subdirs recursively
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self.report()
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for x in self.subdirs.keys():
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print
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self.subdirs[x].report_full_closure()
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def cmpfiles(a, b, common, shallow=1, use_statcache=0):
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"""Compare common files in two directories.
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a, b -- directory names
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common -- list of file names found in both directories
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shallow -- if true, do comparison based solely on stat() information
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use_statcache -- if true, use statcache.stat() instead of os.stat()
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Returns a tuple of three lists:
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files that compare equal
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files that are different
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filenames that aren't regular files.
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"""
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res = ([], [], [])
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for x in common:
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ax = os.path.join(a, x)
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bx = os.path.join(b, x)
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res[_cmp(ax, bx, shallow, use_statcache)].append(x)
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return res
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# Compare two files.
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# Return:
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# 0 for equal
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# 1 for different
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# 2 for funny cases (can't stat, etc.)
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#
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def _cmp(a, b, sh, st):
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try:
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return not abs(cmp(a, b, sh, st))
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except os.error:
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return 2
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# Return a copy with items that occur in skip removed.
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#
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def _filter(list, skip):
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result = []
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for item in list:
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if item not in skip: result.append(item)
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return result
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# Demonstration and testing.
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#
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def demo():
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import sys
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import getopt
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options, args = getopt.getopt(sys.argv[1:], 'r')
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if len(args) != 2:
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raise getopt.error, 'need exactly two args'
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dd = dircmp(args[0], args[1])
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if ('-r', '') in options:
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dd.report_full_closure()
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else:
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dd.report()
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if __name__ == '__main__':
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demo()
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