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# store.py - repository store handling for Mercurial
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#
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# Copyright 2008 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from i18n import _
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import osutil, scmutil, util
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import os, stat
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_sha = util.sha1
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# This avoids a collision between a file named foo and a dir named
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# foo.i or foo.d
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def encodedir(path):
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'''
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>>> encodedir('data/foo.i')
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'data/foo.i'
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>>> encodedir('data/foo.i/bla.i')
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'data/foo.i.hg/bla.i'
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>>> encodedir('data/foo.i.hg/bla.i')
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'data/foo.i.hg.hg/bla.i'
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'''
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if not path.startswith('data/'):
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return path
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return (path
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.replace(".hg/", ".hg.hg/")
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.replace(".i/", ".i.hg/")
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.replace(".d/", ".d.hg/"))
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def decodedir(path):
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'''
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>>> decodedir('data/foo.i')
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'data/foo.i'
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>>> decodedir('data/foo.i.hg/bla.i')
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'data/foo.i/bla.i'
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>>> decodedir('data/foo.i.hg.hg/bla.i')
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'data/foo.i.hg/bla.i'
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'''
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if not path.startswith('data/') or ".hg/" not in path:
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return path
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return (path
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.replace(".d.hg/", ".d/")
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.replace(".i.hg/", ".i/")
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.replace(".hg.hg/", ".hg/"))
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def _buildencodefun():
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'''
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>>> enc, dec = _buildencodefun()
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>>> enc('nothing/special.txt')
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'nothing/special.txt'
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>>> dec('nothing/special.txt')
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'nothing/special.txt'
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>>> enc('HELLO')
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'_h_e_l_l_o'
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>>> dec('_h_e_l_l_o')
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'HELLO'
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>>> enc('hello:world?')
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'hello~3aworld~3f'
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>>> dec('hello~3aworld~3f')
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'hello:world?'
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>>> enc('the\x07quick\xADshot')
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'the~07quick~adshot'
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>>> dec('the~07quick~adshot')
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'the\\x07quick\\xadshot'
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'''
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e = '_'
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winreserved = [ord(x) for x in '\\:*?"<>|']
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cmap = dict([(chr(x), chr(x)) for x in xrange(127)])
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for x in (range(32) + range(126, 256) + winreserved):
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cmap[chr(x)] = "~%02x" % x
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for x in range(ord("A"), ord("Z")+1) + [ord(e)]:
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cmap[chr(x)] = e + chr(x).lower()
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dmap = {}
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for k, v in cmap.iteritems():
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dmap[v] = k
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def decode(s):
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i = 0
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while i < len(s):
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for l in xrange(1, 4):
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try:
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yield dmap[s[i:i + l]]
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i += l
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break
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except KeyError:
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pass
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else:
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raise KeyError
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return (lambda s: "".join([cmap[c] for c in encodedir(s)]),
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lambda s: decodedir("".join(list(decode(s)))))
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encodefilename, decodefilename = _buildencodefun()
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def _buildlowerencodefun():
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'''
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>>> f = _buildlowerencodefun()
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>>> f('nothing/special.txt')
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'nothing/special.txt'
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>>> f('HELLO')
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'hello'
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>>> f('hello:world?')
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'hello~3aworld~3f'
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>>> f('the\x07quick\xADshot')
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'the~07quick~adshot'
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'''
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winreserved = [ord(x) for x in '\\:*?"<>|']
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cmap = dict([(chr(x), chr(x)) for x in xrange(127)])
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for x in (range(32) + range(126, 256) + winreserved):
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cmap[chr(x)] = "~%02x" % x
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for x in range(ord("A"), ord("Z")+1):
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cmap[chr(x)] = chr(x).lower()
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return lambda s: "".join([cmap[c] for c in s])
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lowerencode = _buildlowerencodefun()
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_winreservednames = '''con prn aux nul
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com1 com2 com3 com4 com5 com6 com7 com8 com9
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lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9'''.split()
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def _auxencode(path, dotencode):
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'''
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Encodes filenames containing names reserved by Windows or which end in
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period or space. Does not touch other single reserved characters c.
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Specifically, c in '\\:*?"<>|' or ord(c) <= 31 are *not* encoded here.
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Additionally encodes space or period at the beginning, if dotencode is
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True.
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path is assumed to be all lowercase.
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>>> _auxencode('.foo/aux.txt/txt.aux/con/prn/nul/foo.', True)
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'~2efoo/au~78.txt/txt.aux/co~6e/pr~6e/nu~6c/foo~2e'
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>>> _auxencode('.com1com2/lpt9.lpt4.lpt1/conprn/foo.', False)
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'.com1com2/lp~749.lpt4.lpt1/conprn/foo~2e'
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>>> _auxencode('foo. ', True)
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'foo.~20'
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>>> _auxencode(' .foo', True)
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'~20.foo'
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'''
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res = []
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for n in path.split('/'):
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if n:
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base = n.split('.')[0]
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if base and (base in _winreservednames):
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# encode third letter ('aux' -> 'au~78')
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ec = "~%02x" % ord(n[2])
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n = n[0:2] + ec + n[3:]
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if n[-1] in '. ':
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# encode last period or space ('foo...' -> 'foo..~2e')
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n = n[:-1] + "~%02x" % ord(n[-1])
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if dotencode and n[0] in '. ':
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n = "~%02x" % ord(n[0]) + n[1:]
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res.append(n)
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return '/'.join(res)
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_maxstorepathlen = 120
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_dirprefixlen = 8
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_maxshortdirslen = 8 * (_dirprefixlen + 1) - 4
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def _hybridencode(path, auxencode):
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'''encodes path with a length limit
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Encodes all paths that begin with 'data/', according to the following.
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Default encoding (reversible):
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Encodes all uppercase letters 'X' as '_x'. All reserved or illegal
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characters are encoded as '~xx', where xx is the two digit hex code
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of the character (see encodefilename).
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Relevant path components consisting of Windows reserved filenames are
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masked by encoding the third character ('aux' -> 'au~78', see auxencode).
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Hashed encoding (not reversible):
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If the default-encoded path is longer than _maxstorepathlen, a
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non-reversible hybrid hashing of the path is done instead.
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This encoding uses up to _dirprefixlen characters of all directory
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levels of the lowerencoded path, but not more levels than can fit into
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_maxshortdirslen.
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Then follows the filler followed by the sha digest of the full path.
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The filler is the beginning of the basename of the lowerencoded path
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(the basename is everything after the last path separator). The filler
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is as long as possible, filling in characters from the basename until
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the encoded path has _maxstorepathlen characters (or all chars of the
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basename have been taken).
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The extension (e.g. '.i' or '.d') is preserved.
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The string 'data/' at the beginning is replaced with 'dh/', if the hashed
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encoding was used.
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'''
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if not path.startswith('data/'):
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return path
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# escape directories ending with .i and .d
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path = encodedir(path)
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ndpath = path[len('data/'):]
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res = 'data/' + auxencode(encodefilename(ndpath))
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if len(res) > _maxstorepathlen:
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digest = _sha(path).hexdigest()
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aep = auxencode(lowerencode(ndpath))
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_root, ext = os.path.splitext(aep)
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parts = aep.split('/')
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basename = parts[-1]
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sdirs = []
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for p in parts[:-1]:
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d = p[:_dirprefixlen]
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if d[-1] in '. ':
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# Windows can't access dirs ending in period or space
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d = d[:-1] + '_'
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t = '/'.join(sdirs) + '/' + d
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if len(t) > _maxshortdirslen:
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break
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sdirs.append(d)
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dirs = '/'.join(sdirs)
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if len(dirs) > 0:
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dirs += '/'
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res = 'dh/' + dirs + digest + ext
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spaceleft = _maxstorepathlen - len(res)
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if spaceleft > 0:
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filler = basename[:spaceleft]
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res = 'dh/' + dirs + filler + digest + ext
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return res
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def _calcmode(path):
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try:
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# files in .hg/ will be created using this mode
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mode = os.stat(path).st_mode
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# avoid some useless chmods
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if (0777 & ~util.umask) == (0777 & mode):
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mode = None
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except OSError:
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mode = None
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return mode
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_data = 'data 00manifest.d 00manifest.i 00changelog.d 00changelog.i phaseroots'
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class basicstore(object):
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'''base class for local repository stores'''
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def __init__(self, path, openertype):
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self.path = path
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self.createmode = _calcmode(path)
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op = openertype(self.path)
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op.createmode = self.createmode
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self.opener = scmutil.filteropener(op, encodedir)
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def join(self, f):
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return self.path + '/' + encodedir(f)
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def _walk(self, relpath, recurse):
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'''yields (unencoded, encoded, size)'''
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path = self.path
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if relpath:
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path += '/' + relpath
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striplen = len(self.path) + 1
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l = []
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if os.path.isdir(path):
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visit = [path]
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while visit:
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p = visit.pop()
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for f, kind, st in osutil.listdir(p, stat=True):
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fp = p + '/' + f
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if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'):
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n = util.pconvert(fp[striplen:])
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l.append((decodedir(n), n, st.st_size))
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elif kind == stat.S_IFDIR and recurse:
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visit.append(fp)
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return sorted(l)
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def datafiles(self):
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return self._walk('data', True)
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def walk(self):
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'''yields (unencoded, encoded, size)'''
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# yield data files first
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for x in self.datafiles():
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yield x
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# yield manifest before changelog
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for x in reversed(self._walk('', False)):
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yield x
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def copylist(self):
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return ['requires'] + _data.split()
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def write(self):
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pass
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class encodedstore(basicstore):
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def __init__(self, path, openertype):
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self.path = path + '/store'
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self.createmode = _calcmode(self.path)
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op = openertype(self.path)
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op.createmode = self.createmode
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self.opener = scmutil.filteropener(op, encodefilename)
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def datafiles(self):
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for a, b, size in self._walk('data', True):
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try:
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a = decodefilename(a)
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except KeyError:
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a = None
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yield a, b, size
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def join(self, f):
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return self.path + '/' + encodefilename(f)
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def copylist(self):
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return (['requires', '00changelog.i'] +
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['store/' + f for f in _data.split()])
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class fncache(object):
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# the filename used to be partially encoded
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# hence the encodedir/decodedir dance
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def __init__(self, opener):
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self.opener = opener
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self.entries = None
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self._dirty = False
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def _load(self):
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'''fill the entries from the fncache file'''
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self.entries = set()
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self._dirty = False
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try:
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fp = self.opener('fncache', mode='rb')
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except IOError:
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# skip nonexistent file
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return
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for n, line in enumerate(fp):
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if (len(line) < 2) or (line[-1] != '\n'):
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t = _('invalid entry in fncache, line %s') % (n + 1)
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raise util.Abort(t)
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self.entries.add(decodedir(line[:-1]))
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fp.close()
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def rewrite(self, files):
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fp = self.opener('fncache', mode='wb')
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for p in files:
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fp.write(encodedir(p) + '\n')
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fp.close()
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self.entries = set(files)
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self._dirty = False
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def write(self):
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if not self._dirty:
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return
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fp = self.opener('fncache', mode='wb', atomictemp=True)
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for p in self.entries:
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fp.write(encodedir(p) + '\n')
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fp.close()
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self._dirty = False
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def add(self, fn):
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if self.entries is None:
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self._load()
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if fn not in self.entries:
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self._dirty = True
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self.entries.add(fn)
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def __contains__(self, fn):
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if self.entries is None:
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self._load()
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return fn in self.entries
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def __iter__(self):
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if self.entries is None:
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self._load()
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return iter(self.entries)
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class _fncacheopener(scmutil.abstractopener):
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def __init__(self, op, fnc, encode):
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self.opener = op
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self.fncache = fnc
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self.encode = encode
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def __call__(self, path, mode='r', *args, **kw):
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if mode not in ('r', 'rb') and path.startswith('data/'):
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self.fncache.add(path)
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return self.opener(self.encode(path), mode, *args, **kw)
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class fncachestore(basicstore):
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def __init__(self, path, openertype, encode):
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self.encode = encode
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self.path = path + '/store'
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self.createmode = _calcmode(self.path)
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op = openertype(self.path)
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op.createmode = self.createmode
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fnc = fncache(op)
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self.fncache = fnc
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self.opener = _fncacheopener(op, fnc, encode)
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def join(self, f):
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return self.path + '/' + self.encode(f)
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def datafiles(self):
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rewrite = False
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existing = []
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spath = self.path
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for f in self.fncache:
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ef = self.encode(f)
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try:
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st = os.stat(spath + '/' + ef)
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yield f, ef, st.st_size
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existing.append(f)
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except OSError:
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# nonexistent entry
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rewrite = True
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if rewrite:
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# rewrite fncache to remove nonexistent entries
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# (may be caused by rollback / strip)
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self.fncache.rewrite(existing)
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def copylist(self):
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d = ('data dh fncache phaseroots'
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' 00manifest.d 00manifest.i 00changelog.d 00changelog.i')
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return (['requires', '00changelog.i'] +
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['store/' + f for f in d.split()])
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def write(self):
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self.fncache.write()
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def store(requirements, path, openertype):
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if 'store' in requirements:
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if 'fncache' in requirements:
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auxencode = lambda f: _auxencode(f, 'dotencode' in requirements)
|
|
|
encode = lambda f: _hybridencode(f, auxencode)
|
|
|
return fncachestore(path, openertype, encode)
|
|
|
return encodedstore(path, openertype)
|
|
|
return basicstore(path, openertype)
|
|
|
|
