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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 __future__ import absolute_import
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import errno
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import hashlib
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import os
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import stat
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from .i18n import _
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from . import (
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error,
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node,
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policy,
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pycompat,
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util,
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vfs as vfsmod,
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)
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parsers = policy.importmod(r'parsers')
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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(b'data/foo.i')
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'data/foo.i'
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>>> _encodedir(b'data/foo.i/bla.i')
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'data/foo.i.hg/bla.i'
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>>> _encodedir(b'data/foo.i.hg/bla.i')
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'data/foo.i.hg.hg/bla.i'
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>>> _encodedir(b'data/foo.i\\ndata/foo.i/bla.i\\ndata/foo.i.hg/bla.i\\n')
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'data/foo.i\\ndata/foo.i.hg/bla.i\\ndata/foo.i.hg.hg/bla.i\\n'
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'''
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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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encodedir = getattr(parsers, 'encodedir', _encodedir)
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def decodedir(path):
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'''
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>>> decodedir(b'data/foo.i')
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'data/foo.i'
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>>> decodedir(b'data/foo.i.hg/bla.i')
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'data/foo.i/bla.i'
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>>> decodedir(b'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 ".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 _reserved():
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''' characters that are problematic for filesystems
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* ascii escapes (0..31)
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* ascii hi (126..255)
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* windows specials
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these characters will be escaped by encodefunctions
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'''
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winreserved = [ord(x) for x in u'\\:*?"<>|']
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for x in range(32):
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yield x
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for x in range(126, 256):
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yield x
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for x in winreserved:
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yield x
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def _buildencodefun():
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'''
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>>> enc, dec = _buildencodefun()
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>>> enc(b'nothing/special.txt')
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'nothing/special.txt'
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>>> dec(b'nothing/special.txt')
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'nothing/special.txt'
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>>> enc(b'HELLO')
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'_h_e_l_l_o'
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>>> dec(b'_h_e_l_l_o')
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'HELLO'
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>>> enc(b'hello:world?')
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'hello~3aworld~3f'
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>>> dec(b'hello~3aworld~3f')
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'hello:world?'
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>>> enc(b'the\\x07quick\\xADshot')
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'the~07quick~adshot'
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>>> dec(b'the~07quick~adshot')
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'the\\x07quick\\xadshot'
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'''
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e = '_'
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xchr = pycompat.bytechr
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asciistr = list(map(xchr, range(127)))
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capitals = list(range(ord("A"), ord("Z") + 1))
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cmap = dict((x, x) for x in asciistr)
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for x in _reserved():
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cmap[xchr(x)] = "~%02x" % x
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for x in capitals + [ord(e)]:
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cmap[xchr(x)] = e + xchr(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[s[c:c + 1]] for c in xrange(len(s))]),
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lambda s: ''.join(list(decode(s))))
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_encodefname, _decodefname = _buildencodefun()
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def encodefilename(s):
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'''
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>>> encodefilename(b'foo.i/bar.d/bla.hg/hi:world?/HELLO')
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'foo.i.hg/bar.d.hg/bla.hg.hg/hi~3aworld~3f/_h_e_l_l_o'
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'''
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return _encodefname(encodedir(s))
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def decodefilename(s):
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'''
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>>> decodefilename(b'foo.i.hg/bar.d.hg/bla.hg.hg/hi~3aworld~3f/_h_e_l_l_o')
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'foo.i/bar.d/bla.hg/hi:world?/HELLO'
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'''
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return decodedir(_decodefname(s))
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def _buildlowerencodefun():
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'''
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>>> f = _buildlowerencodefun()
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>>> f(b'nothing/special.txt')
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'nothing/special.txt'
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>>> f(b'HELLO')
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'hello'
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>>> f(b'hello:world?')
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'hello~3aworld~3f'
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>>> f(b'the\\x07quick\\xADshot')
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'the~07quick~adshot'
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'''
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xchr = pycompat.bytechr
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cmap = dict([(xchr(x), xchr(x)) for x in xrange(127)])
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for x in _reserved():
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cmap[xchr(x)] = "~%02x" % x
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for x in range(ord("A"), ord("Z") + 1):
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cmap[xchr(x)] = xchr(x).lower()
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def lowerencode(s):
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return "".join([cmap[c] for c in pycompat.iterbytestr(s)])
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return lowerencode
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lowerencode = getattr(parsers, 'lowerencode', None) or _buildlowerencodefun()
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# Windows reserved names: con, prn, aux, nul, com1..com9, lpt1..lpt9
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_winres3 = ('aux', 'con', 'prn', 'nul') # length 3
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_winres4 = ('com', 'lpt') # length 4 (with trailing 1..9)
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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. Parameter path is assumed to be all lowercase.
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A segment only needs encoding if a reserved name appears as a
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basename (e.g. "aux", "aux.foo"). A directory or file named "foo.aux"
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doesn't need encoding.
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>>> s = b'.foo/aux.txt/txt.aux/con/prn/nul/foo.'
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>>> _auxencode(s.split(b'/'), True)
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['~2efoo', 'au~78.txt', 'txt.aux', 'co~6e', 'pr~6e', 'nu~6c', 'foo~2e']
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>>> s = b'.com1com2/lpt9.lpt4.lpt1/conprn/com0/lpt0/foo.'
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>>> _auxencode(s.split(b'/'), False)
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['.com1com2', 'lp~749.lpt4.lpt1', 'conprn', 'com0', 'lpt0', 'foo~2e']
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>>> _auxencode([b'foo. '], True)
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['foo.~20']
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>>> _auxencode([b' .foo'], True)
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['~20.foo']
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'''
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for i, n in enumerate(path):
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if not n:
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continue
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if dotencode and n[0] in '. ':
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n = "~%02x" % ord(n[0:1]) + n[1:]
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path[i] = n
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else:
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l = n.find('.')
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if l == -1:
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l = len(n)
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if ((l == 3 and n[:3] in _winres3) or
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(l == 4 and n[3:4] <= '9' and n[3:4] >= '1'
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and n[:3] in _winres4)):
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# encode third letter ('aux' -> 'au~78')
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ec = "~%02x" % ord(n[2:3])
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n = n[0:2] + ec + n[3:]
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path[i] = n
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if n[-1] in '. ':
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# encode last period or space ('foo...' -> 'foo..~2e')
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path[i] = n[:-1] + "~%02x" % ord(n[-1:])
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return path
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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 _hashencode(path, dotencode):
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digest = node.hex(hashlib.sha1(path).digest())
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le = lowerencode(path[5:]).split('/') # skips prefix 'data/' or 'meta/'
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parts = _auxencode(le, dotencode)
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basename = parts[-1]
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_root, ext = os.path.splitext(basename)
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sdirs = []
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sdirslen = 0
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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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if sdirslen == 0:
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t = len(d)
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else:
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t = sdirslen + 1 + len(d)
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if t > _maxshortdirslen:
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break
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sdirs.append(d)
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sdirslen = t
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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 _hybridencode(path, dotencode):
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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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path = encodedir(path)
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ef = _encodefname(path).split('/')
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res = '/'.join(_auxencode(ef, dotencode))
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if len(res) > _maxstorepathlen:
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res = _hashencode(path, dotencode)
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return res
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def _pathencode(path):
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de = encodedir(path)
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if len(path) > _maxstorepathlen:
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return _hashencode(de, True)
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ef = _encodefname(de).split('/')
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res = '/'.join(_auxencode(ef, True))
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if len(res) > _maxstorepathlen:
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return _hashencode(de, True)
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return res
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_pathencode = getattr(parsers, 'pathencode', _pathencode)
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def _plainhybridencode(f):
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return _hybridencode(f, False)
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def _calcmode(vfs):
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try:
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# files in .hg/ will be created using this mode
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mode = vfs.stat().st_mode
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# avoid some useless chmods
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if (0o777 & ~util.umask) == (0o777 & 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 meta 00manifest.d 00manifest.i 00changelog.d 00changelog.i'
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' phaseroots obsstore')
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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, vfstype):
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vfs = vfstype(path)
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self.path = vfs.base
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self.createmode = _calcmode(vfs)
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vfs.createmode = self.createmode
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self.rawvfs = vfs
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self.vfs = vfsmod.filtervfs(vfs, encodedir)
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self.opener = self.vfs
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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 self.rawvfs.isdir(path):
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visit = [path]
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readdir = self.rawvfs.readdir
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while visit:
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p = visit.pop()
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for f, kind, st in readdir(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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l.sort()
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return l
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def datafiles(self):
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return self._walk('data', True) + self._walk('meta', True)
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def topfiles(self):
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# yield manifest before changelog
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return reversed(self._walk('', False))
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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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for x in self.topfiles():
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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, tr):
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pass
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def invalidatecaches(self):
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pass
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def markremoved(self, fn):
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pass
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def __contains__(self, path):
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'''Checks if the store contains path'''
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path = "/".join(("data", path))
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# file?
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if self.vfs.exists(path + ".i"):
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return True
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# dir?
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if not path.endswith("/"):
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path = path + "/"
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return self.vfs.exists(path)
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class encodedstore(basicstore):
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def __init__(self, path, vfstype):
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vfs = vfstype(path + '/store')
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self.path = vfs.base
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self.createmode = _calcmode(vfs)
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vfs.createmode = self.createmode
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self.rawvfs = vfs
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self.vfs = vfsmod.filtervfs(vfs, encodefilename)
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self.opener = self.vfs
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def datafiles(self):
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for a, b, size in super(encodedstore, self).datafiles():
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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):
|
|
|
return (['requires', '00changelog.i'] +
|
|
|
['store/' + f for f in _data.split()])
|
|
|
|
|
|
class fncache(object):
|
|
|
# the filename used to be partially encoded
|
|
|
# hence the encodedir/decodedir dance
|
|
|
def __init__(self, vfs):
|
|
|
self.vfs = vfs
|
|
|
self.entries = None
|
|
|
self._dirty = False
|
|
|
|
|
|
def _load(self):
|
|
|
'''fill the entries from the fncache file'''
|
|
|
self._dirty = False
|
|
|
try:
|
|
|
fp = self.vfs('fncache', mode='rb')
|
|
|
except IOError:
|
|
|
# skip nonexistent file
|
|
|
self.entries = set()
|
|
|
return
|
|
|
self.entries = set(decodedir(fp.read()).splitlines())
|
|
|
if '' in self.entries:
|
|
|
fp.seek(0)
|
|
|
for n, line in enumerate(util.iterfile(fp)):
|
|
|
if not line.rstrip('\n'):
|
|
|
t = _('invalid entry in fncache, line %d') % (n + 1)
|
|
|
raise error.Abort(t)
|
|
|
fp.close()
|
|
|
|
|
|
def write(self, tr):
|
|
|
if self._dirty:
|
|
|
tr.addbackup('fncache')
|
|
|
fp = self.vfs('fncache', mode='wb', atomictemp=True)
|
|
|
if self.entries:
|
|
|
fp.write(encodedir('\n'.join(self.entries) + '\n'))
|
|
|
fp.close()
|
|
|
self._dirty = False
|
|
|
|
|
|
def add(self, fn):
|
|
|
if self.entries is None:
|
|
|
self._load()
|
|
|
if fn not in self.entries:
|
|
|
self._dirty = True
|
|
|
self.entries.add(fn)
|
|
|
|
|
|
def remove(self, fn):
|
|
|
if self.entries is None:
|
|
|
self._load()
|
|
|
try:
|
|
|
self.entries.remove(fn)
|
|
|
self._dirty = True
|
|
|
except KeyError:
|
|
|
pass
|
|
|
|
|
|
def __contains__(self, fn):
|
|
|
if self.entries is None:
|
|
|
self._load()
|
|
|
return fn in self.entries
|
|
|
|
|
|
def __iter__(self):
|
|
|
if self.entries is None:
|
|
|
self._load()
|
|
|
return iter(self.entries)
|
|
|
|
|
|
class _fncachevfs(vfsmod.abstractvfs, vfsmod.proxyvfs):
|
|
|
def __init__(self, vfs, fnc, encode):
|
|
|
vfsmod.proxyvfs.__init__(self, vfs)
|
|
|
self.fncache = fnc
|
|
|
self.encode = encode
|
|
|
|
|
|
def __call__(self, path, mode='r', *args, **kw):
|
|
|
if mode not in ('r', 'rb') and (path.startswith('data/') or
|
|
|
path.startswith('meta/')):
|
|
|
self.fncache.add(path)
|
|
|
return self.vfs(self.encode(path), mode, *args, **kw)
|
|
|
|
|
|
def join(self, path):
|
|
|
if path:
|
|
|
return self.vfs.join(self.encode(path))
|
|
|
else:
|
|
|
return self.vfs.join(path)
|
|
|
|
|
|
class fncachestore(basicstore):
|
|
|
def __init__(self, path, vfstype, dotencode):
|
|
|
if dotencode:
|
|
|
encode = _pathencode
|
|
|
else:
|
|
|
encode = _plainhybridencode
|
|
|
self.encode = encode
|
|
|
vfs = vfstype(path + '/store')
|
|
|
self.path = vfs.base
|
|
|
self.pathsep = self.path + '/'
|
|
|
self.createmode = _calcmode(vfs)
|
|
|
vfs.createmode = self.createmode
|
|
|
self.rawvfs = vfs
|
|
|
fnc = fncache(vfs)
|
|
|
self.fncache = fnc
|
|
|
self.vfs = _fncachevfs(vfs, fnc, encode)
|
|
|
self.opener = self.vfs
|
|
|
|
|
|
def join(self, f):
|
|
|
return self.pathsep + self.encode(f)
|
|
|
|
|
|
def getsize(self, path):
|
|
|
return self.rawvfs.stat(path).st_size
|
|
|
|
|
|
def datafiles(self):
|
|
|
for f in sorted(self.fncache):
|
|
|
ef = self.encode(f)
|
|
|
try:
|
|
|
yield f, ef, self.getsize(ef)
|
|
|
except OSError as err:
|
|
|
if err.errno != errno.ENOENT:
|
|
|
raise
|
|
|
|
|
|
def copylist(self):
|
|
|
d = ('data meta dh fncache phaseroots obsstore'
|
|
|
' 00manifest.d 00manifest.i 00changelog.d 00changelog.i')
|
|
|
return (['requires', '00changelog.i'] +
|
|
|
['store/' + f for f in d.split()])
|
|
|
|
|
|
def write(self, tr):
|
|
|
self.fncache.write(tr)
|
|
|
|
|
|
def invalidatecaches(self):
|
|
|
self.fncache.entries = None
|
|
|
|
|
|
def markremoved(self, fn):
|
|
|
self.fncache.remove(fn)
|
|
|
|
|
|
def _exists(self, f):
|
|
|
ef = self.encode(f)
|
|
|
try:
|
|
|
self.getsize(ef)
|
|
|
return True
|
|
|
except OSError as err:
|
|
|
if err.errno != errno.ENOENT:
|
|
|
raise
|
|
|
# nonexistent entry
|
|
|
return False
|
|
|
|
|
|
def __contains__(self, path):
|
|
|
'''Checks if the store contains path'''
|
|
|
path = "/".join(("data", path))
|
|
|
# check for files (exact match)
|
|
|
e = path + '.i'
|
|
|
if e in self.fncache and self._exists(e):
|
|
|
return True
|
|
|
# now check for directories (prefix match)
|
|
|
if not path.endswith('/'):
|
|
|
path += '/'
|
|
|
for e in self.fncache:
|
|
|
if e.startswith(path) and self._exists(e):
|
|
|
return True
|
|
|
return False
|
|
|
|
|
|
def store(requirements, path, vfstype):
|
|
|
if 'store' in requirements:
|
|
|
if 'fncache' in requirements:
|
|
|
return fncachestore(path, vfstype, 'dotencode' in requirements)
|
|
|
return encodedstore(path, vfstype)
|
|
|
return basicstore(path, vfstype)
|
|
|
|
